CN218611500U - Split-structure punch, stamping and upsetting-extruding die and stamping and upsetting-extruding system - Google Patents

Abstract

The utility model relates to a body structure drift, punching press are beaten crowded mould and punching press and are beaten crowded system, protect the piece including drift body and drift, the drift protects a detachable and installs on the drift body, and one end of it extends to one side of drift body towards material end. The beneficial effects of the utility model are that simple structure, mould long service life can effectively solve the easy cracked problem of former monolithic structure drift.

Description

Split structure punch, stamping and upsetting-extruding die and stamping and upsetting-extruding system

Technical Field

The utility model relates to a stamping die technical field, concretely relates to individual structure drift, punching press are beaten crowded mould and punching press are beaten crowded system of beating up.

Background

The automobile part with the semi-sinking platform structure is processed and formed by adopting a stamping process and an upsetting and extruding die, and the upsetting and extruding punch of the die conventionally adopts an integral structure. During the upsetting-extruding forming process, the integral upsetting-extruding punch is subjected to large lateral force due to material flowing, and stress concentration is easily formed at the joint of the step surfaces due to the step surfaces on the punch, so that the punch is easily broken from the step surfaces.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a separate body structure drift, punching press are beaten crowded mould and punching press are beaten crowded system is provided, aim at solving the problem among the prior art.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

the utility model provides a components of a whole that can function independently drift, includes drift body and drift protects the piece, the drift protects a detachable installation on the drift body, and its one end extends to one side of drift body punching material end.

The utility model has the advantages that: the split type punch design can effectively disperse the stress borne by the punching end of the punch body, avoid the stress concentration borne by the punching end of the punch body and effectively prevent the punch body from being broken; in addition, one end of the punch head protecting block extends to one side of the punching end of the punch head body, one end of the punch head protecting block is in contact with the die before the punching end of the punch head body during punching, the punch head body is further protected, the punch head body is prevented from being broken, the service life of the punch head body is prolonged, and the problem that the original punch head with an integral structure is prone to breaking can be effectively solved.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Furthermore, a step is arranged at the position, close to the punching end, of the punch body, and a boss is arranged on the step; the punch head protecting block is arranged at the step and is provided with a groove; the boss can snap into the recess to connect the punch guard and the punch body, or exit the recess to separate the punch guard and the punch body.

The beneficial effects of adopting above-mentioned further scheme are that during the use, the boss on the drift body can block in the recess on the drift protects the piece to connecting the drift and protecting piece and drift body, or the boss on the drift body withdraws from the drift and protects the recess on the piece, protects piece and drift body with the separation drift, realizes that the drift protects the quick assembly disassembly of piece and drift body, and is easy and simple to handle, labour saving and time saving.

The utility model also relates to a stamping and upsetting die, which comprises the punch with the split structure, an upper die and a lower die, wherein the lower die is fixedly arranged, the upper die is arranged above the lower die and can move up and down to be close to or far away from the lower die; the punch body is fixedly arranged on the upper die, and the material punching end of the punch body extends downwards to a position between the upper die and the lower die.

The adoption of the further scheme has the beneficial effects that when the device is applied, the lower die is fixed on the machine tool, and the upper die is fixedly connected with the telescopic end of the hydraulic cylinder on the machine tool; when processing, treat that the processing part is arranged in on the lower mould, the pneumatic cylinder drives mould and drift body and move down with the punching press part to rapid prototyping part, processing is convenient.

Further, the upper die comprises an upper fixing plate, the upper fixing plate is horizontally arranged above the lower die and can move up and down; the punch body is fixedly arranged on the upper fixing plate, and the material punching end of the punch body extends downwards to a position between the upper fixing plate and the lower die.

The further scheme has the beneficial effects that when the device is applied, the lower die is fixed on the machine tool, and the upper fixing plate is fixedly connected with the telescopic end of the hydraulic cylinder on the machine tool; when processing, treat that the processing part is arranged in on the lower mould, the pneumatic cylinder drives upper fixed plate and drift body and moves down with the punching press part to rapid prototyping part, processing is convenient.

Further, the upper die further comprises a discharging mechanism, and the discharging mechanism is installed on the upper fixing plate and used for discharging the raw materials on the punch body.

The beneficial effects of adopting above-mentioned further scheme are that after the part punching press was accomplished, the pneumatic cylinder on the lathe drove the mould and shifts up, and discharge mechanism unloads the raw materials on to the drift body simultaneously, and convenient and fast, the production efficiency height of unloading.

Further, the lower die comprises a female die insert which is fixedly arranged below the upper die, and an avoiding groove for avoiding the punch protection block is formed in the female die insert.

The further scheme has the beneficial effects that during processing, the end part of the part is supported by the concave die insert so as to facilitate the subsequent upper die to punch the part; in addition, the avoiding groove in the female die insert can effectively avoid the punch protecting block during punching, so that the punch protecting block can protect the punch body in the part punching process, and the part punching process cannot be influenced.

Furthermore, a limiting mechanism for limiting the part is fixedly mounted on the female die insert.

The beneficial effects of adopting above-mentioned further scheme are that add man-hour, the tip of part is arranged in on the die mold insert to carry on spacingly through stop gear to the tip of part, avoid the tip of part to take place the displacement and influence the punching press of part, guarantee the quality of part punching press.

Furthermore, a material returning mechanism is further installed on the female die insert and used for returning the raw materials on the female die insert.

The beneficial effects of adopting above-mentioned further scheme are that add man-hour, the part punching press is accomplished the back, carries out the material returned through material returning mechanism to the raw materials on the die mold insert, realizes automatic material returning, need not artifical material returning, and production efficiency improves greatly.

The utility model discloses still relate to a punching press is beaten and is crowded system, including two as above punching press is beaten and is crowded mould, two the lower mould sets up relatively, is used for the both ends of punching press part respectively.

The beneficial effect of adopting above-mentioned further scheme is that processing, can carry out synchronous punching press to the both ends of part simultaneously through two moulds, machining efficiency improves greatly.

Furthermore, the die further comprises a base platform, wherein the two lower dies are relatively and fixedly arranged on the base platform, and a positioning mechanism is further arranged on the base platform and positioned between the two lower dies for positioning the part.

The beneficial effects of adopting above-mentioned further scheme are that add man-hour, on the base station was arranged in to the part, its both ends were located the lower mould respectively to fix a position the middle part of part through positioning mechanism, further increase the stability of part, avoid the part to take place the displacement, guarantee the quality of part punching press.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of the middle stamping and upsetting die of the present invention;

fig. 3 is a schematic structural view of the middle concave mold insert of the present invention;

fig. 4 is a schematic structural view of the punch of the present invention;

fig. 5 is a schematic structural view of the middle punch body of the present invention;

fig. 6 is a schematic structural view of the punch head protection block of the present invention;

fig. 7 is a schematic structural diagram of the components of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a punch head protection block; 2. a punch body; 3. a concave die insert; 4. a material returning block; 5. a top rod; 6. a lower die holder; 7. a lower base plate; 8. fixing a female die plate; 9. a stripper plate; 10. an upper fixing plate; 11. an upper base plate; 12. an upper die holder; 13. a first stop block; 14. a second stop block; 15. a first positioning block; 16. a second positioning block; 17. a boss; 18. a groove; 19. an avoidance groove; 20. a part; 21. a base station; 22. an elastic member; 23. a guide bar; 24. a long screw; 25. and fixing the grooves.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

Example 1

As shown in fig. 4 to 7, the present embodiment provides a punch with a split structure, which includes a punch body 2 and a punch guard 1, wherein the punch guard 1 is detachably mounted on the punch body 2, and one end of the punch guard extends to one side of a punching end of the punch body 2. In the scheme, the split type punch design can effectively disperse the stress borne by the punching end of the punch body 2, avoid the stress concentration borne by the punching end of the punch body 2 and effectively prevent the punch body 2 from being broken; in addition, one end of the punch head protecting block 1 extends to one side of the punching end of the punch head body 2, one end of the punch head protecting block 1 is in contact with a die before the punching end of the punch head body 2 during punching, the punch head body 2 is further protected, the punch head body 2 is prevented from being broken, the service life of the punch head body 2 is prolonged, and the problem that the punch head of the original integral structure is prone to breaking can be effectively solved.

It should be noted that, one end of the punch guard 1 extends to one side of the punching end of the punch body 2, and the side of the punching end of the punch body 2 refers to one side close to the lower die of the punching and upsetting die.

Example 2

On the basis of the embodiment 1, in the embodiment, a step is arranged at the position of the punch body 2 close to the punching end, a boss 17 is arranged on the step, and the boss 17 and the punch body 2 are integrally formed; the punch head protecting block 1 is arranged at the step, a groove 18 is arranged on the punch head protecting block, and the groove 18 is formed by sinking the corresponding position of the punch head protecting block 1; the boss 17 can be snapped into the recess 18 to connect the punch guard 1 and punch body 2, or withdrawn from the recess 18 to separate the punch guard 1 and punch body 2.

During the use, the boss 17 on the drift body 2 can block in the recess 18 on the drift protects piece 1 to connect drift and protect piece 1 and drift body 2, or the boss 17 on the drift body 2 withdraws from the drift and protects recess 18 on the piece 1, protects piece 1 and drift body 2 with the separation drift, realizes that the drift protects the quick assembly disassembly of piece 1 and drift body 2, and is easy and simple to handle, labour saving and time saving.

Besides the above embodiments, the punch guard block 1 and the punch body 2 may also be detachably connected by other means, for example, the punch body 2 is provided with a step near the punching end thereof, and the punch guard block 1 is mounted at the step by a bolt.

Example 3

As shown in fig. 2 to 7, on the basis of the above embodiments, the present embodiment further provides a stamping and upsetting die, which includes the punch with the split structure as described above, and further includes an upper die and a lower die, the lower die is fixedly disposed, the upper die is mounted above the lower die and can move up and down to be close to or far from the lower die; the punch body 2 is fixedly arranged on the upper die, and the punching end of the punch body extends downwards to a position between the upper die and the lower die.

When the device is applied, the lower die is fixed on a machine tool, and the upper die is fixedly connected with the telescopic end of a hydraulic cylinder on the machine tool; when processing, wait to process part 20 and arrange in the lower mould on, the pneumatic cylinder drives to go up mould and drift body 2 and move down with punching press part 20 to rapid prototyping part 20, processing is convenient.

Example 4

On the basis of embodiment 3, in this embodiment, the upper mold includes an upper fixing plate 10, and the upper fixing plate 10 is horizontally installed above the lower mold and can move up and down; the punch body 2 is fixedly mounted on the upper fixing plate 10, and the punching end of the punch body extends downwards to a position between the upper fixing plate 10 and the lower die.

When the device is used, the lower die is fixed on a machine tool, and the upper fixing plate 10 is fixedly connected with the telescopic end of a hydraulic cylinder on the machine tool; during processing, a part 20 to be processed is placed on the lower die, the hydraulic cylinder drives the upper fixing plate 10 and the punch body 2 to move downwards to punch the part 20, so that the part 20 is rapidly formed, and the processing is convenient.

Preferably, in this embodiment, the upper die further includes an upper die base 12, the upper die base 12 is fixedly connected to a telescopic end of a hydraulic cylinder on the machine tool, and the hydraulic cylinder stretches and retracts to drive the upper die base 12 to move up and down.

In addition, an upper padding plate 11 is fixedly arranged between the upper die base 12 and the upper fixing plate 10, and the upper padding plate 11 can increase the strength of the upper die and prolong the service life of the upper die.

When the device is used, the lower die is fixed on a machine tool, and the upper die base 12 is fixedly connected with the telescopic end of a hydraulic cylinder on the machine tool; when the part 20 to be machined is machined, the part 20 is placed on the lower die, the hydraulic cylinder drives the upper die base 12, the upper backing plate 11, the upper fixing plate 10 and the punch body 2 to move downwards to punch the part 20, the part 20 is quickly formed, and machining is convenient.

Example 5

On the basis of embodiment 4, in this embodiment, the upper die further includes a discharging mechanism, and the discharging mechanism is installed on the upper fixing plate 10 and is used for discharging the raw material on the punch body 2. After the part 20 is punched, the hydraulic cylinder on the machine tool drives the upper die to move upwards, and meanwhile, the discharging mechanism discharges the raw materials on the punch body 2, so that the discharging is convenient and fast, and the production efficiency is high.

The discharging mechanism comprises a discharging plate 9, the discharging plate 9 is horizontally arranged between the upper fixing plate 10 and the lower die, and is connected with the upper fixing plate 10 through an elastic piece 22.

During processing, a part 20 to be processed is placed on the lower die, the hydraulic cylinder drives the upper die holder 12, the upper backing plate 11, the upper fixing plate 10, the discharging plate 9 and the punch body 2 to move downwards to punch the part 20 so as to rapidly form the part 20, and the elastic part 22 is in a compressed state at the moment;

after the forming, the hydraulic cylinder drives the upper die base 12, the upper padding plate 11, the upper fixing plate 10, the discharging plate 9 and the punch body 2 to move upwards, and the discharging plate 9 moves downwards under the elastic action of the elastic piece 22 to discharge the raw materials on the punch body 2, so that automatic discharging is realized, and the production efficiency is greatly improved.

In this embodiment, the elastic member 22 is preferably an elastic block made of polyurethane, and the number of the elastic blocks may be one, or may be multiple, and preferably two, and the elastic blocks are respectively located at two ends of the discharging plate 9.

Preferably, in this embodiment, the upper fixing plate 10 is fixedly connected to the upper end of the guide rod 23, and the lower end of the guide rod 23 vertically extends downward below the upper fixing plate 10 and is slidably connected to the guide holes penetrating up and down on the discharging plate 9. When unloading, guide rod 23 leads stripper 9, increases the stability that stripper 9 reciprocated.

In addition, a through hole is further formed in the upper die base 12, a long screw 24 is installed in the through hole in a vertically sliding manner, and the lower end of the long screw 24 penetrates through the upper padding plate 11, the upper fixing plate 10 and the corresponding elastic piece 22 downwards in sequence and then is fixedly connected with the discharging plate 9. The long screws 24 are slidably connected with the through holes in the upper die base 12 in the process that the discharging plate 9 moves up and down along with the upper fixing plate 10, and the stability of the discharging plate 9 is further improved.

It should be noted that the elastic member 22 does not affect the installation and sliding of the guide rod 23 and the long screw 24.

Example 6

In the present embodiment, on the basis of any one of embodiments 3 to 5, the lower die includes a die insert 3, and the die insert 3 is fixedly mounted below the upper die and provided with an avoiding groove 19 for avoiding the punch guard 1.

During processing, the end part of the part 20 is supported by the concave die insert 3, so that the part 20 can be stamped by a subsequent upper die; in addition, the avoidance groove 19 on the female die insert 3 can effectively avoid the punch protection block 1 during punching, so that the punch protection block 1 can protect the punch body 2 in the punching process of the part 20, and the punching of the part 20 cannot be influenced.

Preferably, in this embodiment, the lower die further includes a lower die holder 6, a lower bolster 7 and a die fixing plate 8, the lower die holder 6 is fixedly installed on the machine tool, the lower bolster 7 is horizontally and fixedly installed on the lower die holder 6, the die fixing plate 8 is horizontally and fixedly installed on the lower bolster 7, a mounting groove is formed in the die fixing plate 8, the die insert 3 is fixedly installed in the mounting groove, and the upper end face of the die insert is flush with the upper end face of the die fixing plate 8.

The lower backing plate 7 can increase the strength of the lower die and prolong the service life of the lower die; in addition, the female die fixing plate 8 can further protect the female die insert 3, protect the female die insert 3 and prolong the service life of the female die insert.

Example 7

On the basis of embodiment 6, in this embodiment, a limiting mechanism for limiting the part 20 is further fixedly mounted on the die insert 3.

During machining, the end part of the part 20 is placed on the female die insert 3, the end part of the part 20 is limited through the limiting mechanism, the influence on the punching of the part 20 caused by the displacement of the end part of the part 20 is avoided, and the punching quality of the part 20 is ensured.

Preferably, in this embodiment, the limiting mechanism includes a second stopper 14, and the second stopper 14 is fixedly mounted on the cavity insert 3 and located at one side of the avoiding groove 19. The end part of the part 20 is arranged on the female die insert 3, one side of the part is attached to the second stop block 14, and the other side of the part is positioned in the notch of the avoidance groove 19 and attached to the punch head protection block 1 during punching.

In addition, a fixing groove 25 is arranged at a corresponding position on the die insert 3, and the second stopper 14 is fixedly installed in the fixing groove 25, and the upper end of the second stopper extends out of the fixing groove 25 to be attached to one side of the end part of the part 20.

Preferably, in this embodiment, the limiting mechanism further includes a first stopper 13, the first stopper 13 is fixedly installed at the same end of the avoiding groove 19 and the fixing groove 25 for abutting against the end of the part 20, and one side of the first stopper 13 extends into the avoiding groove 19 so as to better abut against the end of the part 20.

The first stopper 13 does not affect the up-and-down movement of the punch guard 1 during punching.

Example 8

On the basis of any one of embodiments 6 to 7, in this embodiment, the material returning mechanism is further installed on the cavity insert 3, and the material returning mechanism is used for returning the raw material on the cavity insert 3.

When processing, after 20 parts are punched, the material on the female die insert 3 is returned through the material returning mechanism, so that automatic material returning is realized, manual material returning is not needed, and the production efficiency is greatly improved.

Preferably, in this embodiment, the material returning mechanism includes a material returning block 4 and a top rod 5, the die insert 3, the lower bolster 7 and the lower die holder 6 are respectively provided with an upper hole, a middle hole and a lower hole which are communicated with each other, the material returning block 4 is installed in the avoiding groove 19 in a vertically sliding manner, the lower end of the material returning block passes through the upper hole and extends into the middle hole, the material returning block is of a structure which is thin at the top and thick at the bottom, the thick portion of the material returning block is located in the middle hole, the size of the thick portion of the material returning block is larger than the aperture of the upper hole, and the material returning block 4 can move up to the thick portion of the material returning block to abut against the lower end of the upper hole for limiting.

In addition, the ejector rod 5 is installed in the lower hole in a vertically sliding mode, the lower end of the ejector rod vertically extends downwards to the position below the lower die base 6, and the ejector rod is fixedly connected with an electric push rod on a machine tool. When returning, the electric push rod can drive the ejector rod 5 to move upwards to push the material returning block 4 to move upwards so as to push the raw materials in the avoiding groove 19 out for discharging; after the unloading is finished, the electric push rod drives the ejector rod 5 to move downwards, and the material returning block 4 moves downwards to an initial position under the action of self gravity.

Example 9

As shown in fig. 1 to fig. 7, on the basis of the above embodiments, the present embodiment further provides a stamping upsetting-extruding system, which includes two stamping upsetting dies as described above, and two lower dies disposed opposite to each other and respectively used for stamping two ends of the part 20. During processing, the two ends of the part 20 can be synchronously stamped through the two dies, and the processing efficiency is greatly improved.

Example 10

On the basis of the embodiment 9, the present embodiment further includes a base table 21, the two lower dies are relatively and fixedly mounted on the base table 21, that is, the two lower die bases 6 are relatively and fixedly mounted on the base table 21, and through holes for the two electric push rods to pass through are respectively provided on the base table 21, so that the two electric push rods respectively drive the two push rods 5 to move up and down to perform material returning.

In addition, a positioning mechanism is further mounted on the base 21, and the positioning mechanism is located between the two lower dies and used for positioning the component 20.

Preferably, in this embodiment, the positioning mechanism includes a first positioning block 15 and a second positioning block 16, and the first positioning block 15 and the second positioning block 16 are fixedly installed on the base 21 at intervals, and can be respectively inserted into two corresponding processing holes on the component 20.

During machining, the part 20 is placed on the base 21, two ends of the part are located on the lower die respectively, the middle of the part 20 is located through the locating mechanism, the stability of the part 20 is further improved, the part 20 is prevented from being displaced, and the stamping quality of the part 20 is guaranteed.

The working principle of the utility model is as follows:

firstly, manually placing a part 20 on a base 21, enabling two ends of the part 20 to be respectively positioned on a lower die, namely two female die inserts 3, and simultaneously enabling a first positioning block 15 and a second positioning block 16 to be respectively inserted into two corresponding processing holes on the part 20;

then, two hydraulic cylinders on the machine tool synchronously move two upper die holders 12 downwards synchronously, the two upper die holders 12 respectively drive an upper backing plate 11, an upper fixing plate 10 and a stripper plate 9 thereon to synchronously move downwards so that the two punch bodies 2 punch the part 20, at the moment, the punching end of the punch body 2 presses the end part of the part 20, the punch protection block 1 is inserted into the avoidance groove 19, and the elastic part 22 is in a compressed state;

finally, after the punching is finished, the two hydraulic cylinders synchronously drive the two upper dies to synchronously move upwards, and at the moment, the two stripper plates 9 respectively move downwards under the action of the elastic forces of the two elastic pieces 22 so as to remove the raw materials at the punching end of the punch body 2; meanwhile, the two electric push rods respectively drive the two push rods 5 to move upwards to push the material returning block 4 to move upwards, so that the raw materials in the avoiding groove 19 are pushed out for discharging;

after the part 20 is stamped, the part 20 is manually or mechanically taken down; the above operations are repeated to realize the press working of the batch of parts 20.

It should be noted that, the electronic components according to the present invention are all of the prior art, and the above components are electrically connected to a controller (model TC-SCR), and a control circuit between the controller and each component is of the prior art.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides a components of a whole that can function independently drift which characterized in that: the punch head protection device is characterized by comprising a punch head body (2) and a punch head protection block (1), wherein the punch head protection block (1) is detachably mounted on the punch head body (2), and one end of the punch head protection block extends to one side of a punching end of the punch head body (2).

2. The split punch as claimed in claim 1, wherein: a step is arranged at the position, close to the punching end, of the punch head body (2), and a boss (17) is arranged on the step; the punch head protecting block (1) is arranged at the step and is provided with a groove (18); the boss (17) can be snapped into the recess (18) to connect the punch guard (1) and the punch body (2), or can be withdrawn from the recess (18) to separate the punch guard (1) and the punch body (2).

3. A stamping and upsetting die is characterized in that: the punch with the split structure comprises the punch with the split structure as claimed in any one of claims 1 to 2, and further comprises an upper die and a lower die, wherein the lower die is fixedly arranged, and the upper die is arranged above the lower die and can move up and down to be close to or far away from the lower die; the punch body (2) is fixedly arranged on the upper die, and the material punching end of the punch body extends downwards to the position between the upper die and the lower die.

4. The punching and upsetting die as recited in claim 3, wherein: the upper die comprises an upper fixing plate (10), and the upper fixing plate (10) is horizontally arranged above the lower die and can move up and down; the punch body (2) is fixedly arranged on the upper fixing plate (10), and the material punching end of the punch body extends downwards to a position between the upper fixing plate (10) and the lower die.

5. The punch upsetting die as recited in claim 4, wherein: the upper die further comprises a discharging mechanism, and the discharging mechanism is installed on the upper fixing plate (10) and used for discharging the raw materials on the punch body (2).

6. The punching and upsetting die as recited in any one of claims 3 to 5, wherein: the lower die comprises a female die insert (3), the female die insert (3) is fixedly arranged below the upper die, and an avoidance groove (19) for avoiding the punch protection block (1) is formed in the female die insert (3).

7. The punch upsetting die as recited in claim 6, wherein: and a limiting mechanism for limiting the part (20) is also fixedly arranged on the female die insert (3).

8. The punch upsetting die as recited in claim 6, wherein: and the material returning mechanism is also arranged on the female die insert (3) and is used for returning the raw materials on the female die insert (3).

9. A stamping, upsetting and extruding system is characterized in that: comprising two stamping and upsetting dies according to any of the claims from 3 to 8, said two lower dies being arranged opposite each other, for stamping the two ends of the part (20) respectively.

10. The punch upsetting extrusion system as recited in claim 9, wherein: the die comprises a base table (21), wherein the two lower dies are relatively and fixedly installed on the base table (21), a positioning mechanism is further installed on the lower dies, and the positioning mechanism is located between the two lower dies and used for positioning a part (20).

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