CN213162596U - Flanging hydraulic press - Google Patents

Abstract

The utility model discloses a hem hydraulic press belongs to the metalworking equipment field, can provide even tight power that rises for the product, makes the both ends of product carry out the hem operation simultaneously, the utility model discloses a hem hydraulic press, include the frame, install last mould and lower mould in the frame and install go up the mould with tight mould that rises between the lower mould, the tight mould that rises includes the mould body, the mould body comprises polylith components of a whole that can function independently module, polylith components of a whole that can function independently module offsets vacuole formation each other, is equipped with two piece at least inclined plane platforms along vertical direction on every components of a whole that can function independently module, be equipped with the voussoir that offsets with the inclined plane platform in the cavity. The embodiment of the utility model provides a can be applied to products such as hydraulic press, flanging machine.

Description

Flanging hydraulic press

[ technical field ] A method for producing a semiconductor device

The utility model relates to a metal processing equipment field especially relates to hem hydraulic press.

[ background of the invention ]

When carrying out the hem to the product, current hem equipment often carries out the hem to the one end of product earlier, carries out the hem to the other end again, and efficiency is lower, and behind the one end hem, its head size has changed, has a lot of problems when the second clamping, and if pay-off, ejection of compact space will be bigger, tight stroke extension rises, and it is too big still to consider the tight power that rises simultaneously, can lead to the condition that original buckle collapses out.

In the prior art, some devices capable of folding edges of two ends of a product simultaneously exist, but the efficiency is not high, the tension force provided by the tension die is not stable enough, and the tension force is difficult to control well so as to deal with products made of different materials.

[ Utility model ] content

The utility model aims to solve the technical problem that overcome prior art not enough and propose the hem hydraulic press, can provide even tight power that rises for the product, make the both ends of product can carry out the hem operation simultaneously.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the flanging hydraulic press comprises a frame, an upper die, a lower die and a tensioning device, wherein the upper die and the lower die are arranged on the frame, the tensioning device is arranged between the upper die and the lower die, the upper die and the lower die are provided with edge folding annular grooves, the tensioning device comprises an upper die base, a lower die base and a die body positioned between the upper die base and the lower die base, the mould body consists of a plurality of split modules which are mutually abutted to form a cavity, at least two inclined planes are arranged on each split module along the vertical direction, a wedge block which is propped against the inclined plane table and a reset component which controls the reset of the plurality of split modules are arranged in the cavity, at least two fixed rods are arranged between the upper die holder and the lower die holder, the wedge block is in sliding fit with the fixed rods, and the rack is provided with a driving assembly for controlling the wedge block, the upper die and the lower die to move up and down and an adjusting assembly for adjusting the tension force of the tension device.

The utility model discloses a hem hydraulic press adopts upper die and lower mould to extrude the product simultaneously and makes the both ends of product enter into the hem ring channel, can carry out the hem operation to the both ends of product simultaneously, tight device that rises is used for tight product that rises to guarantee that the product can not appear the position change when the hem, the mould body comprises polylith sub-module, when needing to go on tight operation that rises, the voussoir in the cavity slides, through the cooperation with the inclined plane platform, can convert the axial displacement of voussoir into the radial displacement of polylith sub-module, make polylith sub-module outwards move simultaneously, thereby the tight product of cover outside the mould body that rises sets up multiunit inclined plane platform, can make polylith sub-module keep steady in the process of tight product that rises, avoid appearing the crooked condition of sub-module, reset assembly can be in the process that the voussoir resets, polylith sub-module resets gradually, so as to facilitate the next tensioning operation;

the fixed rod is used for fixing the upper die holder and the lower die holder, so that the position between the upper die holder and the lower die holder can be kept unchanged, the die body can be limited between the upper die holder and the lower die holder, in addition, the fixed rod can also play a role in guiding and positioning, and the wedge block can only slide up and down along the fixed rod without rotating tendency; the adjusting assembly can control the tension force, namely the displacement distance of the split modules, so as to deal with products made of different materials and avoid the products from cracking in the tension process.

Furthermore, a support table is arranged on the machine frame, the lower die holder and the lower die are arranged on the support table, and the lower die is arranged in the circumferential direction of the lower die holder. The supporting table is used for supporting the tensioning device, so that the tensioning device cannot be changed in position in the edge folding process, and the lower die moves in the circumferential direction of the lower die base, so that edge folding operation can be performed on the lower end of a product.

Furthermore, an oil cylinder fixing seat is arranged below the supporting table on the machine frame, and the driving assembly comprises a lower oil cylinder and a tensioning oil cylinder, wherein the lower oil cylinder is arranged on the oil cylinder fixing seat and used for controlling the lower die to move up and down, and the tensioning oil cylinder is used for controlling the wedge block to move up and down. The lower oil cylinder needs to control the displacement of the lower die, the tensioning oil cylinder needs to control the displacement of the wedge block, the two oil cylinders can both receive small reaction force in the operation process, and the oil cylinder fixing seat can fix the oil cylinders to eliminate the influence of the reaction force on the two oil cylinders.

Furthermore, a lower sliding block connected with the lower oil cylinder is arranged between the supporting platform and the oil cylinder fixing seat, and a plurality of ejector rods penetrating through the supporting platform and abutting against the lower die are arranged on the lower sliding block. The lower die is arranged in the circumferential direction of the lower die holder and can be regarded as an annular die holder, so that the lower die can be stably pushed to move up and down through a plurality of supporting points, the lower sliding block is driven by the lower oil cylinder, and the plurality of ejector rods on the lower sliding block can be ensured to move synchronously, so that the lower die can move stably.

Furthermore, the tensioning oil cylinder is connected with a tensioning rod, and the tensioning rod penetrates through the upper die base and the lower die base and is fixedly connected with the wedge block. The upper die base and the lower die base can be used for stabilizing the tension rod and preventing the tension rod from being bent so as to ensure the stability of the whole structure, and the tension rod is used for connecting a plurality of wedge blocks in the cavity so as to control the wedge blocks to move up and down in the cavity.

Furthermore, the tensioning rod comprises an adjusting rod extending out of the tensioning oil cylinder downwards, and the adjusting assembly comprises an adjusting nut arranged on the adjusting rod and a locknut for preventing the adjusting nut from sliding on the adjusting rod. The adjusting nut can be adjusted to change the length of the adjusting rod extending into the tensioning oil cylinder, so that the telescopic distance of the tensioning rod and the displacement length of the wedge block are changed, the displacement distance of the split module, namely the tensioning force, is changed, and the anti-loosening nut is used for limiting the displacement of the adjusting nut so as to ensure that the tensioning force is unchanged.

Furthermore, the driving assembly further comprises a plurality of upper oil cylinders, upper sliding blocks connected with the upper oil cylinders are arranged on the rack, and the upper die is mounted on the upper sliding blocks. A plurality of last cylinders can provide great power for the top shoe, enable the top shoe fast down and quick return stroke, and the hem is fast.

Furthermore, the plurality of split modules at least comprise four split modules which are opposite front and back, left and right and four split modules which are distributed at four opposite angles. The existing tensioning device at most comprises four split modules which are distributed at the front, back, left and right, in the tensioning process, the position between the four split modules is not tensioned due to the fact that the split modules are not arranged, and the distance between every two adjacent split modules is large, compared with the prior art, at least eight split modules are used for tensioning.

Furthermore, the reset assembly comprises a plurality of reset springs, the split modules which are opposite in front, back, left and right are connected through the reset springs, and the split modules at four opposite angles are connected with the fixed rod through the reset springs. Reset spring is from taking elasticity, and when polylith components of a whole that can function independently module was pushed away by the voussoir and is carried out the tight operation that rises, reset spring was pulled open and is saved elasticity, and during reseing, components of a whole that can function independently module can be pulled back the normal position gradually under the effect of elasticity, and simple structure is with low costs, and position change can not appear in the dead lever, and the reset spring who is connected with the dead lever also can not receive the influence.

Furthermore, the tensioning device further comprises a guide assembly used for guiding the plurality of split modules to move, the guide assembly comprises a guide groove and a guide key, one of the guide groove and the guide key is arranged on the upper die base and the lower die base, and the other is arranged on the die body. The guide assembly can ensure that the split module can well expand according to a specific route when moving, and can ensure that the split module can be smoothly reset, the matching strength of the guide groove and the guide key is high, and the split module can not deviate.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The invention will be further explained with reference to the drawings:

FIG. 1 is a schematic structural view of a flanging hydraulic press in an embodiment of the present invention;

FIG. 2 is an enlarged schematic view at A in FIG. 1;

fig. 3 is a cross-sectional view of the tension device in the embodiment of the present invention;

fig. 4 is a schematic structural view of a tensioning device in an embodiment of the present invention;

fig. 5 is a schematic structural view of the tension device in the tension state according to the embodiment of the present invention;

fig. 6 is an enlarged schematic view of fig. 1 at B.

Reference numerals:

the flanging die comprises a frame 100, an upper die 110, a lower die 120, a flanging annular groove 130, a supporting table 140 and a limiting table 150;

the device comprises a tensioning device 200, an upper die holder 210, a lower die holder 220, a die body 230, a split module 231, an inclined platform 232, a wedge 233, a cavity 234, a return spring 240, a fixing rod 250, a guide rod 260, a tensioning rod 270, a guide groove 280 and a guide key 290;

the tensioning oil cylinder 300, the lower oil cylinder 310, the upper oil cylinder 320 and the oil cylinder fixing seat 330;

a lower slider 400 and a top bar 410;

an upper slider 500;

an adjusting rod 600, an adjusting nut 610 and a locknut 620.

[ detailed description ] embodiments

The technical solutions of the embodiments of the present invention are explained and explained below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 and 2, the embodiment provides a hemming hydraulic press including a frame 100, an upper die 110 and a lower die 120 mounted on the frame 100, and a tensioning device 200 mounted between the upper die 110 and the lower die 120.

Different from the existing flanging hydraulic press, the flanging hydraulic press of the embodiment adopts the upper die 110 and the lower die 120 to simultaneously extrude products to complete flanging operation, and does not need to complete flanging at one end first and then perform flanging at the other end, so that the processing time can be reduced, and the efficiency can be improved.

The upper die 110 and the lower die 120 are provided with a hemming annular groove 130, the groove surface is arc-shaped, when the edge of the product contacts the hemming annular groove 130, the edge of the product contacts the groove surface, and the edge of the product can be bent along the groove surface along with the extrusion of the upper die 110 and the lower die 120, so that the hemming operation is completed; the edges of products with different sizes can contact the surface of the flanging annular groove 130 to complete flanging.

Referring to fig. 3 and 4, the tensioning device 200 includes an upper die holder 210, a lower die holder 220, and a die body 230 located between the upper die holder 210 and the lower die holder 220, the die body 230 is composed of a plurality of split modules 231, the split modules 231 at least include four split modules 231 which are opposite front and back, left and right, and four split modules 231 which are distributed at four opposite corners, the split modules 231 are mutually abutted to form a cavity 234, each split module 231 is provided with at least two inclined surface platforms 232 along a vertical direction, a wedge 233 which is abutted to the inclined surface platforms 232 and a reset assembly which controls the split modules 231 to reset are arranged in the cavity 234, and in addition, a driving assembly which controls the wedge 233, the upper die 110 and the lower die 120 to move up and down is arranged on the frame 100.

The tensioning device 200 is used for tensioning products to ensure that the position of the products cannot be changed during edge folding, the shape of the die body 230 is not regular cylindrical or elliptical but similar elliptical, the die body is a closed cylinder surrounded by a plurality of arcs and is provided with round corners, referring to fig. 5, the die body 230 is composed of a plurality of split modules 231, when tensioning operation is required, the wedge 233 in the cavity 234 slides, axial displacement of the wedge 233 can be converted into radial displacement of the split modules 231 through cooperation with the inclined surface platform 232, the split modules 231 can simultaneously move outwards, so that the products sleeved outside the die body 230 are tensioned, the plurality of groups of inclined surface platforms 232 are arranged, the split modules 231 can be kept stable in the process of tensioning the products, the situation that the split modules are bent is avoided, the resetting component can gradually reset the split modules 231 in the process that the wedge 233 resets, so as to facilitate the next tensioning operation;

the existing tensioning device at most comprises four split modules distributed at the front, the back, the left and the right, in the tensioning process, the position between the four split modules is not tensioned due to the fact that the split modules are not arranged, and the distance between every two adjacent split modules is large, compared with the prior art, at least eight split modules 231 are used for tensioning, when the tensioning is carried out, each split module 231 only needs to move outwards for a little distance, the tensioning can be completed, in addition, the distance between every two adjacent split modules 231 is small, the part of the product which is not in contact with the split modules 231 after being tensioned is small, the product width of the part is small, even if the product is not in contact with the tensioning split modules 231, the product can be tensioned by the split modules 231 on the two sides, and the tensioning effect is better.

Of course, the four split modules at the front, the rear, the left and the right can be divided into eight blocks so as to achieve better tensioning effect.

For the convenience of distinction, the four split modules at the front, back, left and right are labeled 231a, and the four diagonal split modules are labeled 231 b.

The mold body 230 at least comprises two groups of inclined plane platforms 232, one group is arranged at the position of the mold body 230 close to the upper end, the other group is arranged at the position of the mold body 230 close to the lower end, and the number of the wedge blocks 233 is the same as that of the inclined plane platforms 232, so that the upper end and the lower end of the mold body 230 are reinforced by the inclined plane platforms 232, are not easy to bend, and cannot influence the tensioning effect.

Referring to fig. 1, when the upper die 110 and the lower die 120 perform the hemming operation on a product, the tensioning device 200 is clamped between the upper die 110 and the lower die 120, a component for supporting the tensioning device 200 needs to be arranged on the frame 100, for this reason, a supporting table 140 is arranged on the frame 100, a lower die holder 220 and the lower die 120 are arranged on the supporting table 140, the lower die 120 is arranged in the circumferential direction of the lower die holder 220, the tensioning device 200 is placed on the supporting table 140, the overall structure can be kept stable, position change cannot occur in the hemming process, the lower die 120 can move in the vertical direction of the tensioning device 200, and the hemming operation is performed on the lower end of the product.

The supporting table 140 is further provided with a limiting table 150 for limiting the lower die 120, and the limiting table 150 can limit the displacement of the lower die 120, so that excessive product extrusion of the lower die 120 and the tensioning device 200 are avoided.

Referring to fig. 5, the reset assembly includes a plurality of reset springs 240, the reset springs 240 have elastic force, when the plurality of split modules 231 are pushed by the wedge 233 to perform a tensioning operation, the reset springs 240 are pulled to store the elastic force, when the split modules 231 are reset, the split modules 231 can be gradually pulled back to their original positions under the action of the elastic force, the springs provide restoring force, the structure is simple, the cost is low, the front and rear split modules 231a and the left and right split modules 231a are connected by the reset springs 240, the width of the four split modules 231a is large, it is easy to set the reset springs 240, the distance between the other four split modules 231b is large, if the four split modules are connected by the reset springs 240, the positions of the fixing rods 250 and the guide rods 260 between the upper mold base 210 and the lower mold base 220 need to be arranged, and the number and the positions of the reset springs 240 between the front and rear split modules 231a and the left and, therefore, the return springs 240 of the four divided modules 231b are connected to the fixing rods 250, and the four fixing rods 250 are respectively disposed at the four corners of the upper die set 210 and the lower die set 220 to be close to the four divided modules 231b, so that the return springs 240 are connected to the fixing rods 250 without affecting the sliding of the other divided modules 231a and the wedge 233, and a plurality of return springs 240 are disposed at each divided module 231 to maintain the stability during the return, so that the entire divided modules 231 can be displaced in synchronization.

Referring to fig. 1, 3, 4 and 5, a tension rod 270 is further disposed in the die body 230, the tension rod 270 penetrates through the upper die base 210 and the lower die base 220 and is fixedly connected with the wedges 233, the upper die base 210 and the lower die base 220 can be used for stabilizing the tension rod 270, so as to prevent the tension rod 270 from bending, so as to ensure stability of the overall structure, the tension rod 270 is used for connecting a plurality of wedges 233 in the cavity 234, so as to control the wedges 233 to move up and down in the cavity 234, and power for moving up and down of the tension rod 270 is provided by a driving assembly.

Wherein, drive assembly includes: a tension cylinder 300 connected with the tension rod 270, a lower cylinder 310 for controlling the lower die 120 to move up and down, and an upper cylinder 320 for controlling the upper die 110 to move up and down.

An oil cylinder fixing seat 330 is arranged below the support platform 140 on the frame 100, the tensioning oil cylinder 300 and the lower oil cylinder 310 are arranged on the oil cylinder fixing seat 330, the lower oil cylinder 310 needs to control the displacement of the lower die 120, the tensioning oil cylinder 300 needs to control the displacement of the wedge 233, the two oil cylinders can both receive small reaction force in the operation process, and the oil cylinder fixing seat 330 can fix the oil cylinders to eliminate the influence of the reaction force on the two oil cylinders.

The lower slider 400 connected with the lower oil cylinder 310 is arranged between the supporting platform 140 and the oil cylinder fixing seat 330, the lower slider 400 is provided with a plurality of ejector rods 410 which penetrate through the supporting platform 140 and abut against the lower die 120, the lower die 120 is arranged in the circumferential direction of the lower die holder 220 and can be regarded as an annular die holder, therefore, the lower die 120 can be stably pushed to move up and down through a plurality of supporting points, the lower slider 400 is driven by the lower oil cylinder 310, the movement of the ejector rods 410 on the lower slider 400 can be ensured to be synchronous movement, the lower die 120 can stably move, the lower oil cylinder 310 can be fully pushed to move to realize edge folding operation, the number of the lower oil cylinders 310 is set to be two, the two lower oil cylinders are arranged on two sides of the tensioning oil cylinder 300, the two oil cylinders can provide larger force, and the thrust force.

The number of the upper oil cylinders 320 is also set to be a plurality, the upper sliding blocks 500 are connected to the upper oil cylinders 320, the upper die 110 is mounted on the upper sliding blocks 500, the upper oil cylinders 320 can provide large force for the upper sliding blocks 500, the upper sliding blocks 500 can move downwards and return quickly, and the edge folding speed is high.

Referring to fig. 6, products of different materials, sizes and wall thicknesses require different tensioning forces, and if an excessive tensioning force is provided, the products may crack during tensioning, so an adjusting assembly for adjusting the tensioning force of the tensioning device 200 is further provided on the frame 100, the adjusting assembly may control the tensioning force, that is, the displacement distance of the split module 231 is controlled by the displacement distance of the wedge 233, so that only the displacement of the tensioning rod 270 needs to be adjusted, an adjusting rod 600 extending downward from the tensioning cylinder 300 is provided on the tensioning rod 270, the adjusting assembly includes an adjusting nut 610 provided on the adjusting rod 600 and a locknut 620 preventing the adjusting nut 610 from sliding on the adjusting rod 600, the adjusting nut 610 cannot enter the tensioning cylinder 300 along with the adjusting rod 600, and the adjusting nut 610 may change the length of the adjusting rod 600 extending into the tensioning cylinder 300, thereby the flexible distance of the tension rod 270 and the displacement length of the wedge 233 are changed, so as to change the displacement distance of the split module 231, and the locknut 620 is provided with a displacement for limiting the adjusting nut 610, so as to ensure that the tension force is not changed. A pressure gauge can be arranged to observe the tension force so as to be convenient for accurate adjustment; or the tensioning oil cylinder is controlled by using a program, so that the tensioning oil cylinder controls the displacement distance of the tensioning rod according to the program setting.

Referring to fig. 3 to 5, the tensioning device 200 is further provided with a guide assembly for guiding the plurality of split modules 231 to move, the guide assembly is used for guiding the split modules 231 to enable the split modules 231 to move according to a specific route so as to ensure a good tensioning effect, the guide assembly comprises guide grooves 280 and guide keys 290, the upper end and the lower end of each split module 231 are respectively provided with the guide keys 290, the lower end surface of the upper die base 210 and the upper end surface of the lower die base 220 are respectively provided with the guide grooves 280, wherein the upper end and the lower end of the four split modules 231a at the front, the rear, the left and the right are respectively provided with two guide keys 290, the guide grooves 280 and the guide keys 290 are firmly matched, the split modules 231 cannot deviate, and when the split modules 231 move, the guide grooves 280 limit the moving direction of the guide keys 290 so as to ensure the moving direction. The guide key can also be arranged on the upper die base and the lower die base, and the guide groove is arranged on the split module.

The guide groove 280 may limit the displacement of the split block 231 toward the center of the cavity 234, so that the split block 231 may be maintained at a predetermined position between the upper die set 210 and the lower die set 220 when it is reset.

In order to further limit the displacement of the split modules 231 towards the center of the cavity 234, two side edges of each split module 231 are provided with inclined surfaces, the inclined surfaces of two adjacent split modules 231 are abutted, the inclined surfaces play a limiting role and can limit the distance between each split module 231 and the center of the cavity 234, and in the resetting process of the split modules 231, the split modules 231 move towards the center of the cavity 234 under the action of the resetting assembly until the split modules 231 are abutted.

The embodiment of the utility model provides a can be applied to products such as hydraulic press, flanging machine.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims (10)

1. The flanging hydraulic press is characterized in that: comprises a frame, an upper die and a lower die which are arranged on the frame, and a tensioning device which is arranged between the upper die and the lower die, the upper die and the lower die are provided with edge folding annular grooves, the tensioning device comprises an upper die base, a lower die base and a die body positioned between the upper die base and the lower die base, the mould body consists of a plurality of split modules which are mutually abutted to form a cavity, at least two inclined planes are arranged on each split module along the vertical direction, a wedge block which is propped against the inclined plane table and a reset component which controls the reset of the plurality of split modules are arranged in the cavity, at least two fixed rods are arranged between the upper die holder and the lower die holder, the wedge block is in sliding fit with the fixed rods, and the rack is provided with a driving assembly for controlling the wedge block, the upper die and the lower die to move up and down and an adjusting assembly for adjusting the tension force of the tension device.

2. The hemming hydraulic machine of claim 1 wherein: the machine frame is provided with a supporting table, the lower die holder and the lower die are arranged on the supporting table, and the lower die is arranged in the circumferential direction of the lower die holder.

3. The hemming hydraulic machine of claim 2 wherein: and an oil cylinder fixing seat is arranged below the supporting table on the frame, and the driving assembly comprises a lower oil cylinder and a tensioning oil cylinder, wherein the lower oil cylinder is arranged on the oil cylinder fixing seat and used for controlling the lower die to move up and down, and the tensioning oil cylinder is used for controlling the wedge block to move up and down.

4. The hemming hydraulic machine of claim 3 wherein: a lower sliding block connected with the lower oil cylinder is arranged between the supporting platform and the oil cylinder fixing seat, and a plurality of ejector rods penetrating through the supporting platform and abutting against the lower die are arranged on the lower sliding block.

5. The hemming hydraulic machine of claim 3 wherein: the tensioning oil cylinder is connected with a tensioning rod, and the tensioning rod penetrates through the upper die base and the lower die base and is fixedly connected with the wedge block.

6. The hemming hydraulic machine of claim 5 wherein: the tensioning rod comprises an adjusting rod extending out of the tensioning oil cylinder downwards, and the adjusting assembly comprises an adjusting nut arranged on the adjusting rod and a locknut for preventing the adjusting nut from sliding on the adjusting rod.

7. A machine according to one of claims 1 to 6, characterized in that: the driving assembly further comprises a plurality of upper oil cylinders, upper sliding blocks connected with the upper oil cylinders are arranged on the rack, and the upper die is mounted on the upper sliding blocks.

8. A machine according to one of claims 1 to 6, characterized in that: the plurality of split modules at least comprise four split modules which are opposite front and back, left and right and four split modules which are distributed at four opposite angles.

9. The hemming hydraulic machine of claim 8 wherein: the reset assembly comprises a plurality of reset springs, the split modules which are opposite from front to back and left to right are connected through the reset springs, and the split modules at four opposite angles are connected with the fixed rod through the reset springs.

10. A machine according to one of claims 1 to 6, characterized in that: the tensioning device further comprises a guide assembly used for guiding the split modules to move, the guide assembly comprises a guide groove and a guide key, one of the guide groove and the guide key is arranged on the upper die base and the lower die base, and the other guide groove and the guide key are arranged on the die body.

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