CN217798214U - Bending forming die - Google Patents

Abstract

The utility model relates to a bending forming die, which comprises a lower die component, a buoyancy lifting component arranged on one side of the lower die component, and an upper die component arranged above the lower die component and the buoyancy lifting component; the lower die assembly comprises a first fixed block, a second fixed block and a sliding template, wherein the first fixed block and the second fixed block are symmetrically arranged, and the sliding template is connected between the first fixed block and the second fixed block in a sliding mode; the floating assembly comprises a sliding block and a jacking sliding block which is arranged on the sliding block and faces the lower die assembly, and the jacking sliding block is partially arranged in the sliding block and can vertically lift; the upper die assembly comprises a first mounting plate, a first pressing plate, a second pressing plate and a driving plate, wherein the first pressing plate, the second pressing plate and the driving plate are sequentially arranged on the first mounting plate; one side of the sliding block, which is far away from the lower die assembly, is in mutual contact with the bottom of the driving plate, and the driving plate drives the sliding block to slide. The bending forming die is used for bending and forming the annular workpiece, so that the damage of the bending part of the formed workpiece is avoided, the forming stability is improved, and the forming efficiency of the workpiece is improved.

Description

Bending forming die

Technical Field

The utility model relates to a forming die technical field especially relates to a forming die bends.

Background

The annular workpiece is generally obtained by bending and forming a plate-shaped or strip-shaped blank, and the workpiece is closed in shape and cannot be obtained in a forming process in a mode of forming a forming insert in the blank by punching; and bending force is applied to the periphery of the blank by adopting bending equipment, so that the blank is bent to finally form an annular structure. In actual production, when the thickness of a workpiece is small, the bent corner is easy to damage; in addition, the blank is easily shaken or displaced due to poor clamping stability of the bending die, so that the forming effect of a formed workpiece is poor, the defective product rate is high, the forming requirement of the workpiece cannot be met, and the production benefit is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the above problem, providing a can stabilize the forming die that bends of centre gripping and work piece shaping effect preferred to the supplied materials.

In order to solve the technical problem, the utility model discloses a technical scheme, as follows:

a bending forming die comprises a lower die assembly, a floating assembly arranged on one side of the lower die assembly, and an upper die assembly arranged above the lower die assembly and the floating assembly and connected with the lower die assembly and the floating assembly in a matched manner;

the lower die assembly comprises a first fixed block, a second fixed block and a sliding template, wherein the first fixed block and the second fixed block are symmetrically arranged, and the sliding template is connected between the first fixed block and the second fixed block in a sliding mode;

the floating assembly comprises a sliding block and a jacking sliding block which is arranged on the sliding block and faces the lower die assembly, and the jacking sliding block is partially arranged in the sliding block and can vertically lift;

the upper die assembly comprises a first mounting plate, a first pressing plate, a second pressing plate and a driving plate, wherein the first pressing plate, the second pressing plate and the driving plate are sequentially arranged on the first mounting plate; the gap between the first pressing plate and the second pressing plate is projected on the sliding template;

one side of the sliding block, which is far away from the lower die assembly, is in mutual contact with the bottom of the driving plate, and the driving plate drives the sliding block to slide.

Preferably, the bottom of the driving plate is provided with a first oblique angle surface with a side surface inclined towards the second pressing plate, and the sliding block is provided with a second oblique angle surface parallel to the first oblique angle surface at a position close to the driving plate.

Preferably, the first pressing plate and/or the second pressing plate are/is provided with positioning pins; a long hole for the positioning needle to penetrate through is formed in the corresponding area of the jacking sliding block and the positioning needle; the bottom surfaces of the first pressing plate and the second pressing plate are flush, and the bottommost end of the driving plate is lower than the bottom surface of the first pressing plate or the second pressing plate.

Preferably, the first fixing block and the second fixing block are respectively provided with a forming insert at an upper corner close to the sliding template, and the end surface of the forming insert close to the sliding template is arc-shaped.

Furthermore, chamfers are arranged at corners of the first fixing block and the second fixing block close to the forming insert; the first fixing block and the second fixing block are close to one side of the sliding template, a first guide rail for the sliding template to slide is arranged on one side of the sliding template, and a first sliding piece matched with the first guide rail is arranged on the sliding template.

Preferably, the buoyancy lifting assembly further comprises a connecting rod arranged on one side of the sliding block, which is far away from the lower die assembly, and a lift type enclosure enclosing one side of the sliding block, which is far away from the lower die assembly; the opening direction of the v-shaped enclosure is arranged towards the direction of the lower die assembly; the connecting rod vertically penetrates through the side plate of the v-shaped enclosure and the lower die assembly and is placed in the sliding block, the connecting rod is slidably connected with the v-shaped enclosure, and a second elastic piece is sleeved on the connecting rod.

Preferably, the connecting rod includes a main body part and an end part which is arranged at one end of the main body part far away from the sliding block and has a vertical sectional area larger than that of the main body part; step holes for the connecting rods to pass through are formed in the positions, corresponding to the v-shaped enclosure and the connecting rods, of the v-shaped enclosure, and each step hole comprises a first hole with a small cross section area and a second hole with a large cross section area, wherein the first hole is arranged close to the sliding block side, and the second hole is arranged far away from the sliding block side; the second elastic piece is sleeved on the main body part, one end of the second elastic piece is abutted to the hole wall of the first hole, and the other end of the second elastic piece is abutted to the end part.

Further preferably, the sliding block is connected with two parallel side plates of the v-21274type enclosure in a sliding manner, the two parallel side plates of the v-21274are provided with sliding ways for the sliding block to slide, and the sliding block is provided with a sliding structure matched with the sliding ways.

Preferably, the jacking sliding block is right-angled and comprises a first side plate and a second side plate which are vertically connected, the first side plate is vertically inserted into the sliding block, and a first mounting groove for arranging the first side plate is formed in the sliding block; first mounting groove bottom is equipped with the spliced pole, first curb plate with the spliced pole department of correspondence is equipped with the second mounting groove, the cover is equipped with first elastic component on the spliced pole, first elastic component with the coaxial setting of spliced pole, and the one end butt of first elastic component in the tank bottom of first mounting groove, other end butt in the top surface of second mounting groove.

Further preferably, first mounting groove is kept away from be equipped with on the cell wall of lower mould subassembly and be used for right the jacking slider plays limiting displacement's piece that blocks, the bottom surface that blocks the piece with first mounting groove is close to the side top surface of lower mould subassembly side flushes, first curb plate is kept away from be equipped with on the side of lower mould subassembly can with block the protruding connection of piece butt.

The beneficial effects of the utility model include at least:

bending forming die through last mould subassembly, buoyancy lift subassembly and lower mould subassembly's combined action, adopts the buoyancy lift subassembly to treat that the shaping work piece drives to shaping position, goes up the mould subassembly and pushes down the in-process down, and the shaping of lower mould subassembly is inserted and is treated the periphery of shaping work piece and apply the effort of bending, and then will treat that the shaping work piece shaping of bending is annular work piece. The forming of the annular workpiece is facilitated, and the workpiece to be formed can be bent and formed according to the stock layout requirements of customers.

The bending forming is realized by jointly positioning the workpiece to be formed through the positioning pins arranged on the upper die assembly and the gap between the first pressing plate and the second pressing plate, so that the stability of the workpiece to be formed in the bending forming process is improved, and the bending forming efficiency and yield are improved.

First fixed block and second fixed block are close to sliding template's last angle department is equipped with the shaping respectively and inserts, just the shaping is inserted and is close to sliding template's terminal surface is circular-arcly, is treating the shaping work piece and pushes down the in-process and play guide and supporting role to it, when preventing to treat the wing limit resilience of shaping work piece, has avoided the shaping is inserted and is treated the effort on shaping work piece surface in the forming process, has improved the smoothness nature of treating the moving down of shaping work piece, has avoided treating the damage of shaping work piece, and then has avoided the damage of the department of bending.

Drawings

Fig. 1 is an overall schematic view of a bending mold of the present invention;

FIG. 2 is a schematic view of a lower die assembly;

FIG. 3 is a schematic view of a slider;

FIG. 4 is a schematic view of a jacking slider;

FIG. 5 is a schematic view of an upper die assembly;

FIG. 6 is a schematic view of the bending mold in an initial state;

FIG. 7 is a schematic view showing the upper mold assembly descending to the bottom dead center;

wherein, 1 is a workpiece to be formed, 2 is a lower die component, 21 is a first fixed block, 22 is a second fixed block, 23 is a sliding template, 24 is a forming insert, 3, a floating component, 31, a sliding block, 311, a second bevel surface, 312, a first mounting groove, 3121, a connecting column, 313, a blocking block, 32, a lifting slider, 321, a long hole, 322, a first side plate, 3221, a connecting protrusion, 323, a second side plate, 324, a second mounting groove, 325, a first elastic element, 33, a connecting rod, 331, a main body part, 332, 34, a 21274, a stepped hole, 3411, a first hole, 3412, a second hole, 35, a second elastic element, 4, an upper die component, 41, a first mounting plate, 42, a first pressure plate, 43, a second pressure plate, 44, a driving plate, 441, a first bevel surface and 45 are positioning pins.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The description in this application as relating to "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated.

Example 1

Fig. 1 is the utility model discloses a forming die's of bending whole schematic diagram, it is shown with reference to fig. 1, a forming die bends for the shaping of bending of cyclic annular work piece, it includes lower mould subassembly 2, locates the buoyancy lift subassembly 3 of 2 one sides of lower mould subassembly, and locate lower mould subassembly 2 and buoyancy lift subassembly 3 top and with lower mould subassembly 2 and buoyancy lift subassembly 3 cooperation last mould subassembly 4 of being connected. During the use, will wait to form work piece 1 and arrange in buoyancy lift subassembly 3, go up mould subassembly 4 and descend and press buoyancy lift subassembly 3 for wait to form work piece 1 is in under the drive of buoyancy lift subassembly 3, be close to lower mould subassembly 2, go up mould subassembly 4 and descend to dead point down after, wait to form work piece 1 and bend the shaping work piece.

Fig. 2 is a schematic view of a lower die assembly, and referring to fig. 2, the lower die assembly 2 includes a first fixing block 21 and a second fixing block 22 which are symmetrically arranged, and a sliding die plate 23 which is slidably connected between the first fixing block 21 and the second fixing block 22. When the workpiece is bent and formed, the sliding template 23 plays a role in carrying and limiting the bottom surface of the workpiece to be formed, so that the deformation of the bottom surface of the workpiece 1 to be formed after being pressed down is prevented, and the yield of the formed workpiece is ensured.

A reciprocating driving member is disposed in the lower mold assembly 2, so that the sliding mold plate 23 can reciprocate vertically along the first fixing block 21 and the second fixing block 22. Alternatively, in the embodiment of the present invention, the reciprocating driving element is a telescopic cylinder, and an output end of the telescopic cylinder is connected to a bottom surface of the sliding template 23.

Fig. 3 is a schematic view of the sliding block, and referring to fig. 3, the floating assembly 3 includes a sliding block 31 and a lifting slider 32 that is disposed on the sliding block 31 and faces the lower die assembly 2, and the lifting slider 32 is partially disposed in the sliding block 31 and can move vertically; the link 33 is fixedly connected to the slide block 31, and one end of the main body 331 away from the end 332 is disposed in the slide block 31.

Fig. 5 is a schematic diagram of an upper die assembly, and referring to fig. 5, the upper die assembly 4 includes a first mounting plate 41, a first pressing plate 42, a second pressing plate 43 and a driving plate 44, which are sequentially arranged on the first mounting plate 41, and the second pressing plate 43 is disposed near the first pressing plate 42; the gap between the first and second platens 42 and 43 is projected on the sliding template 23; the side of the sliding block 31 far away from the lower die assembly 2 is contacted with the bottom of the driving plate 44, and the driving plate 44 drives the sliding block 31 to slide. As shown in fig. 5, in the embodiment of the present invention, the second pressing plate 43 is provided with a positioning pin 45

Specifically, the width of the gap between the first pressing plate 42 and the second pressing plate 43 matches the maximum width of the workpiece to be formed, specifically, the width of the gap between the first pressing plate 42 and the second pressing plate 43 is equal to the maximum width of the workpiece to be formed or 1-2.5mm wider than the maximum width of the workpiece to be formed. The sliding mold plate 23 is covered in the projection area of the lifting slide block 32 in the vertical direction, and the gap between the first pressing plate 42 and the second pressing plate 43 can also be projected on the lifting slide block 32.

Referring to fig. 5, a first oblique surface 441 is disposed at the bottom of the driving plate 44, and the sliding block 31 is disposed near the driving plate 44 and has a second oblique surface 311 parallel to the first oblique surface 441.

Referring to fig. 4 and 5, a long hole 321 through which the positioning pin 45 passes is formed in a region of the jacking sliding block 32 corresponding to the positioning pin 45; the bottom surfaces of the first pressing plate 42 and the second pressing plate 43 are flush, and the bottommost end of the driving plate 44 is lower than the bottom surface of the first pressing plate 42 or the second pressing plate 43.

Referring to fig. 2, forming inserts 24 are respectively disposed at upper corners of the first fixed block 21 and the second fixed block 22 close to the sliding template 23, and end surfaces of the forming inserts 24 close to the sliding template 23 are arc-shaped. Optionally, the forming insert 24 is cylindrical, and the lower die assembly 2 insert is arranged along the width direction of the sliding die plate 23; or the forming insert 24 is integrally formed with the first fixing block 21 or the second fixing block 22.

Referring to fig. 2 again, corners of the first fixing block 21 and the second fixing block 22 close to the forming insert 24 are provided with chamfers; the first fixing block 21 and the second fixing block 22 are provided with a first guide rail for the sliding of the sliding template 23 on one side close to the sliding template 23, and the sliding template 23 is provided with a first sliding part matched with the first guide rail.

The distance between the length of the sliding template 23 and the end surface of the jacking sliding block 32 or the end surface of the forming insert 24 of the sliding template 23 is equal to the sum of 2 times of the thickness of the workpiece to be formed and the length of the jacking sliding block 32. The sliding stroke of the sliding template 23 is larger than half of the height value of the two sides of the formed workpiece and is smaller than 1.5 times of the height value of the two sides of the formed workpiece. Here, the "length" direction refers to a direction perpendicular to the arrangement direction of the first, second, and third pressing plates 42, 43. Conversely, the "width" direction refers to a direction parallel to the arrangement direction of the first, second, and third pressing plates 42, 43.

Fig. 6 is a schematic view of an initial state of the bending forming die, and referring to fig. 6, the uplift assembly 3 further comprises a connecting rod 33 arranged on a side of the sliding block 31 away from the lower die assembly 2, and a v-21274type fence 34 wrapped on a side of the sliding block 31 away from the lower die assembly 2; the opening direction of the v-shaped baffle 34 is arranged towards the lower die component 2; the connecting rod 33 vertically penetrates through a side plate of the v-shaped enclosure 34 opposite to the lower die assembly 2 and is arranged in the sliding block 31, the connecting rod 33 is connected with the v-shaped enclosure 34 in a sliding mode, and a second elastic piece 35 is sleeved on the connecting rod 33.

Referring to fig. 6 again, the link 33 includes a main body 331, and an end 332 that is disposed at an end of the main body 331 away from the slide block 31 and has a vertical cross-sectional area larger than that of the main body 331; it should be noted that, in the present invention, the vertical direction refers to a direction perpendicular to the plane of the first mounting plate 41. A stepped hole 341 for the connecting rod 33 to pass through is formed at the position of the v-shaped rail 34 and the connecting rod 33, and the stepped hole 341 comprises a first hole 3411 with a smaller cross-sectional area and arranged close to the sliding block 31 side and a second hole 3412 with a larger cross-sectional area and arranged far away from the sliding block 31 side; the link 33 is slidably connected to the first hole 3411, and a sectional area of the first hole 3411 is equal to a sectional area of the body portion 331 of the link 33, where "equal" means that a hole sectional area is equal to a sectional area of the body portion 331 or slightly larger than a sectional area of the body portion 331. The second elastic element 35 is disposed on the body 331 and is coaxial with the body 331, one end of the second elastic element 35 abuts against the hole wall of the first hole 3411, the other end abuts against the end 332, and the diameter of the second elastic element 35 is larger than the sectional area of the body 331 of the link 33.

Referring to fig. 1, the sliding block 31 is connected with two parallel side plates of the v-shaped 2127434 in a sliding manner, two parallel side plates of the v-shaped 21274are provided with sliding ways for the sliding block 31 to slide, and referring to fig. 3, the sliding block 31 is provided with a sliding structure matched with the sliding ways.

Fig. 4 is a schematic view of a jacking slider, and referring to fig. 4, the jacking slider 32 is right-angled, and includes a first side plate 322 and a second side plate 323 that are perpendicularly connected, the first side plate 322 is arranged in parallel with the sliding template 23, the second side plate 323 is arranged facing the lower die assembly 2, and extends from the sliding block 31 to above the sliding template 23, the first side plate 322 is vertically inserted into the sliding block 31, and the sliding block 31 is provided with a first installation groove 312 for arranging the first side plate 322; the bottom of the first mounting groove 312 is provided with a connecting column 3121, a second mounting groove 324 is provided at the position corresponding to the connecting column 3121 of the first side plate 322, a first elastic member 325 is sleeved on the connecting column 3121, the first elastic member 325 and the connecting column 3121 are coaxially arranged, one end of the first elastic member 325 abuts against the groove bottom of the first mounting groove 312, and the other end abuts against the top surface of the second mounting groove 324. In the embodiment of the present invention, the top refers to the direction close to the first mounting plate 41, and the bottom refers to the direction away from the first mounting plate 41.

Referring to fig. 3 again, the first side plate 322 is slidably connected in the first mounting groove 312, and a side edge of the first mounting groove 312 close to the lower mold assembly 2 is flush with a top surface of the sliding mold plate 23 when sliding to the lowest position. A blocking block 313 used for limiting the jacking sliding block 32 is arranged on the groove wall of the first mounting groove 312 far away from the lower die component 2, the bottom surface of the blocking block 313 is flush with the top surface of the side edge of the first mounting groove 312 near the lower die component 2, and a connecting protrusion 3221 capable of being abutted against the blocking block 313 is arranged on the side surface of the first side plate 322 far away from the lower die component 2. The first mounting groove 312 and two vertical wall surfaces of the lower mold component 2 are respectively provided with a second guide rail for the first side plate 322 to slide, and a second sliding part matched with the second guide rail is arranged at a position corresponding to the first side plate 322 and the second guide rail. Optionally, a molding frame is disposed at a position corresponding to a projection of the gap between the first pressing plate 42 and the second pressing plate 43 of the second side plate 323.

Bending forming die's operating principle as follows:

fig. 6 is a schematic view of an initial state of the bending mold, and referring to fig. 6, in the initial state, the upper mold assembly 4 is at a top dead center, the top surface of the sliding mold plate 23 is at a highest point, the top surface of the second side plate 323 is at a highest plane by the jacking sliding block 32 under the supporting action of the first elastic member 325, the side surface of the sliding block 31 away from the lower mold assembly 2 is close to the v-21274l-type fence 34, and the second elastic member 35 is in a natural relaxed state.

When the workpiece 1 to be formed is bent and formed, the workpiece 1 to be formed with the positioning holes on the material belt is conveyed to the position corresponding to the second side plate 323. The upper die assembly 4 moves downwards, the first mounting plate 41 drives the first pressing plate 42, the second pressing plate 43 and the driving plate 44 to move downwards synchronously, the positioning pin 45 is inserted into a positioning hole in the material belt of the workpiece 1 to be formed, and the first bevel surface 441 of the driving plate 44 is in contact with the second bevel surface 311 on the sliding block 31; the driving plate 44 pushes the sliding block 31 to move towards the lower die assembly 2, so as to drive the jacking sliding block 32 and the connecting rod 33 arranged on the sliding block 31 to move towards the lower die assembly 2, so that the jacking sliding block 32 conveys the workpiece 1 to be formed to a forming position corresponding to the gap projection of the first pressing plate 42 and the second pressing plate 43, and the bottom of the driving plate 44 moves downwards between the sliding block 31 and the v-21274type fence 34, so that the second elastic member 35 is compressed and contracted; the upper die assembly 4 continues to move downwards, the second side plate 323 of the jacking sliding block 32 is pressed downwards, the workpiece 1 to be formed is further driven to be in contact with the sliding template 23 of the lower die assembly 2, the sliding template 23 receives the workpiece 1 to be formed and continues to move downwards along with the workpiece 1 to be formed, and in the moving process, the forming insert 24 applies acting force to the workpiece 1 to be formed to bend and form the workpiece 1 to be formed.

Fig. 7 is a schematic view showing a state where the upper die assembly descends to a bottom dead center, and referring to fig. 7, the lower die assembly 4 is operated to a bottom dead center, the slide plate 23 moves down to the lowest point, the second side plate 323 of the lift-up slider 32 is located at the lowest plane, the first elastic member 325 is compressed, the slide block 31 is located away from the v/2127434, the drive plate 44 is inserted between the slide block 31 and the v/2127434, and the second elastic member 35 is compressed. After the bending forming is finished, the upper die assembly 4 moves upwards, the formed workpiece is taken down, and the sliding die plate 23, the jacking sliding block 32, the first elastic piece 325, the sliding block 31 and the second elastic piece 35 reset.

Example 2

The embodiment 2 is different from the embodiment 1 in that the pilot pin 45 is provided on the first presser plate 42.

Example 3

The embodiment 3 is different from the embodiment 1 in that the positioning pins 45 are provided on the first presser plate 42 and the second presser plate 43.

All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above examples only represent preferred embodiments of the present invention, and the description thereof is more specific and detailed, but should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. The utility model provides a forming die bends which characterized in that: the device comprises a lower die assembly, a floating assembly arranged on one side of the lower die assembly, and an upper die assembly which is arranged above the lower die assembly and the floating assembly and is connected with the lower die assembly and the floating assembly in a matching way;

the lower die assembly comprises a first fixed block, a second fixed block and a sliding template, wherein the first fixed block and the second fixed block are symmetrically arranged, and the sliding template is connected between the first fixed block and the second fixed block in a sliding manner;

the floating and lifting assembly comprises a sliding block and a jacking sliding block which is arranged on the sliding block and faces the lower die assembly, and the jacking sliding block is partially arranged in the sliding block and can vertically lift;

the upper die assembly comprises a first mounting plate, a first pressing plate, a second pressing plate and a driving plate, wherein the first pressing plate, the second pressing plate and the driving plate are sequentially arranged on the first mounting plate; the gap between the first pressing plate and the second pressing plate is projected on the sliding template;

one side, far away from the lower die assembly, of the sliding block is in mutual contact with the bottom of the driving plate, and the driving plate drives the sliding block to slide.

2. The bend forming die of claim 1, wherein: the bottom of the driving plate is provided with a first bevel face with a side face inclined towards the second pressing plate, and the sliding block is provided with a second bevel face which is parallel to the first bevel face and is close to the driving plate.

3. The bend forming die of claim 1, wherein: a positioning needle is arranged on the first pressing plate and/or the second pressing plate; a long hole for the positioning needle to penetrate through is formed in the corresponding area of the jacking sliding block and the positioning needle; the bottom surfaces of the first pressing plate and the second pressing plate are flush, and the bottommost end of the driving plate is lower than the bottom surface of the first pressing plate or the second pressing plate.

4. The bend forming die of claim 1, wherein: the upper corners of the first fixed block and the second fixed block, which are close to the sliding template, are respectively provided with a forming insert, and the end faces of the forming inserts, which are close to the sliding template, are arc-shaped.

5. The bend forming die of claim 4, wherein: the corners of the first fixed block and the second fixed block, which are close to the forming insert, are provided with chamfers; the first fixing block and the second fixing block are provided with a first guide rail close to one side of the sliding template, the first guide rail is used for sliding the sliding template, and a first sliding piece matched with the first guide rail is arranged on the sliding template.

6. The bend forming die of claim 1, wherein: the buoyancy lifting assembly further comprises a connecting rod arranged on one side, away from the lower die assembly, of the sliding block and a v-21274type enclosure wrapped on one side, away from the lower die assembly, of the sliding block; the opening direction of the v-shaped enclosure is arranged towards the direction of the lower die assembly; the connecting rod vertically penetrates through a side plate of the v-shaped enclosure and the lower die assembly, and is arranged in the sliding block, the connecting rod is connected with the v-shaped enclosure in a sliding manner, and a second elastic piece is sleeved on the connecting rod.

7. The bend forming die of claim 6, wherein: the connecting rod comprises a main body part and an end part which is arranged at one end of the main body part far away from the sliding block and has a vertical sectional area larger than that of the main body part; stepped holes for the connecting rods to pass through are formed in the positions, corresponding to the V-shaped rail and the connecting rods, of the V-shaped rail, and each stepped hole comprises a first hole with a small sectional area, which is arranged close to the side of the sliding block, and a second hole with a large sectional area, which is arranged far away from the side of the sliding block; the second elastic piece is sleeved on the main body part, one end of the second elastic piece is abutted to the hole wall of the first hole, and the other end of the second elastic piece is abutted to the end part.

8. The bend forming die of claim 6, wherein: the sliding block is connected with two parallel side plates of the v-21274type enclosure in a sliding mode, sliding ways for the sliding block to slide are arranged on the two parallel side plates of the v-21274type enclosure, and a sliding structure matched with the sliding ways is arranged on the sliding block.

9. The bend forming die of claim 1, wherein: the jacking sliding block is right-angled and comprises a first side plate and a second side plate which are vertically connected, the first side plate is vertically inserted into the sliding block, and the sliding block is provided with a first mounting groove for arranging the first side plate; first installation slot bottom is equipped with the spliced pole, first curb plate with the spliced pole department of correspondence is equipped with the second mounting groove, the cover is equipped with first elastic component on the spliced pole, first elastic component with the coaxial setting of spliced pole, and the one end butt of first elastic component in the tank bottom of first mounting groove, other end butt in the top surface of second mounting groove.

10. The bend forming die of claim 9, wherein: keep away from first mounting groove be equipped with on the cell wall of lower mould subassembly be used for right the jacking slider plays limiting displacement's block piece, the bottom surface that blocks the piece with first mounting groove is close to the side top surface of lower mould subassembly side flushes, first curb plate is kept away from be equipped with on the side of lower mould subassembly can with block the connection arch of piece butt.

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