CN112170610A - Liquid-filling forming die and liquid-filling forming method - Google Patents
Liquid-filling forming die and liquid-filling forming method Download PDFInfo
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- CN112170610A CN112170610A CN202010967855.7A CN202010967855A CN112170610A CN 112170610 A CN112170610 A CN 112170610A CN 202010967855 A CN202010967855 A CN 202010967855A CN 112170610 A CN112170610 A CN 112170610A
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- die
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/035—Deforming tubular bodies including an additional treatment performed by fluid pressure, e.g. perforating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Punching Or Piercing (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a liquid-filling forming die and a liquid-filling forming method, wherein the liquid-filling forming die comprises an upper die and a lower die, wherein: the upper die comprises an upper die supporting plate, an upper die bottom plate, a male die insert, a male die holder and a punching assembly; the lower die comprises a lower die supporting plate, a lower die bottom plate, a female die insert, a female die holder and a liquid filling assembly. Compared with the prior art, the invention saves a preforming die and punching times, eliminates collapse and wrinkles at two ends, uses hydraulic online punching as a positioning hole for laser cutting, simplifies the tooling, reduces the cutting cost, improves the precision and consistency of products, punches a hole outside the pipe to eliminate collapse of the punching surface, realizes quick replacement of a punch through a skylight and a connecting block, and saves a pair of flanging tooling by depending on a core rod and a female die for final forming at two end flanging, thereby avoiding the instability of seam allowance welding and the cost of laser cutting.
Description
Technical Field
The invention relates to a mold, in particular to a liquid filling forming mold and a liquid filling forming method.
Background
With the requirement of low-carbon development in recent years, in order to meet the requirement of energy conservation and emission reduction in the automobile industry, the lightweight technology is developed and applied at a high speed. The light weight of the automobile structure is a continuously pursued target of each automobile factory at present, and the light weight of the automobile body greatly contributes to the fuel economy, the control stability and the collision safety of the whole automobile. The liquid filling forming technology is a very advanced process, and the number of parts of an assembly can be effectively reduced, so that the weight of the whole automobile is reduced, and the development cost of a mold is saved; the tooling investment, the labor intensity and the welding quality brought by the subsequent welding are reduced; the strength and rigidity of the whole vehicle, especially the fatigue strength, are improved.
In the prior art, a blank pipe is preformed, then is filled with liquid and finally is formed, and finally holes and side lines are cut by laser to obtain a final product. This approach has the following disadvantages: 1. a pair of preforming molds is developed, and the mold cost and the production cost are increased; 2. the preform is accurately positioned within the final mold cavity; 3. the collapse and the wrinkle of the two ends of the liquid filling end forming can not be recovered; 4. the rabbets at the two ends are unstable in welding and need to be cut by laser; 5. laser cutting has no positioning hole, and the product precision and consistency are poor; 6. punching a hole in the pipe to cause the collapse quality defect of a punching surface; 7. the laser cutting tool clamp is complex in design and increases cutting cost.
Disclosure of Invention
The invention aims to provide a liquid-filling forming die and a liquid-filling forming method, which aim to solve the technical problems in the prior art.
The invention provides a liquid filling forming die, which comprises an upper die and a lower die, wherein:
the upper die comprises an upper die supporting plate, an upper die base plate, a male die insert, a male die holder and a punching assembly, wherein the upper die base plate is fixed on the surface of the upper die supporting plate, the male die insert is fixed in the male die holder, the male die holder is fixed on the upper die base plate, and the top of the male die insert is provided with an upper groove;
the lower die comprises a lower die supporting plate, a lower die bottom plate, a die insert, a die holder and a liquid filling assembly, the lower die bottom plate is fixed on the surface of the lower die supporting plate, the die insert is fixed in the die holder, the die holder is fixed on the lower die bottom plate, and a lower groove is formed in the top of the die insert;
after the upper die and the lower die are assembled, a forming cavity is formed between the upper groove and the lower groove;
the punching assembly comprises a punch and a punching driving piece, the working end of the punching driving piece is connected with the top end of the punch, and the bottom end of the punch is communicated with the top end of the forming cavity;
the liquid filling assembly comprises a core rod and a liquid filling driving piece, the working end of the liquid filling driving piece is connected with one end of the core rod, and the other end of the core rod is communicated with the side end of the forming cavity.
The liquid-filled forming die is characterized in that two punching assemblies are arranged, the two punching assemblies are symmetrically arranged, the punching driving piece comprises a punch fixing block, a punch backing plate, a connecting block and a punching hydraulic cylinder, and the punch is fixed at the working end of the punching hydraulic cylinder sequentially through the punch fixing block, the punch backing plate and the connecting block.
In the above liquid-filled forming die, preferably, the punching hydraulic cylinder is fixed to the upper die base plate, the connecting block is in interference fit with the punch holder, and the punch is in interference fit with the punch insert.
The above liquid-filling forming die preferably has two liquid-filling assemblies, the two liquid-filling assemblies are symmetrically disposed on opposite sides of the lower groove, the liquid-filling driving member includes a plug and a liquid-filling hydraulic cylinder, and the core rod is fixed to a working end of the liquid-filling hydraulic cylinder through the plug.
In the above liquid-filled forming mold, it is preferable that a sealing ring is provided between the core rod and the plug.
The liquid-filled forming mold described above, wherein preferably, the lower mold further includes a lower mold ejection device, the lower mold ejection device includes a female mold symbol block and a lower mold ejection cylinder, the female mold symbol block is in clearance fit with the female mold insert, and a working end of the lower mold ejection cylinder is connected to the female mold symbol block to drive the female mold symbol block to extend into or out of the lower groove.
In the liquid-filled molding die as described above, preferably, the female mold pattern block and the female mold insert are guided and slid by a thin guide plate.
The liquid-filled forming die as described above, wherein preferably, the upper die further includes an upper die ejection device, the upper die ejection device includes a male die symbol block and an upper die ejection cylinder, the male die symbol block is in clearance fit with the male die insert, and a working end of the upper die ejection cylinder is connected to the male die symbol block to drive the male die symbol block to extend into or out of the upper groove.
The invention provides a liquid filling forming method, which comprises the following steps:
(1) during forming, a blank circular pipe is placed in the lower groove, the liquid filling hydraulic cylinder moves to insert the core rod and the plug into the end head of the blank circular pipe, the upper die moves downwards along with the press to be matched with the die, the core rod generates flexible deformation along with the downward movement of the male die insert in the die matching process and serves as a female die medium, and the male die insert and the core rod act to complete preforming, so that a preforming die and punching times are saved, and meanwhile, collapse and wrinkles at two ends can be eliminated;
(2) after the die assembly is completed, the liquid-filled hydraulic cylinders at two ends begin to fill liquid into the blank circular tube to expand and form the preliminarily formed tube blank into a product state, the liquid-filled hydraulic cylinders at two ends increase the pressure and continue to move inwards, the end of the mandrel and the end of the female die insert are subjected to conformal deformation forming under the action of large pressure to complete flanging, and after pressure maintaining, the laser cutting is completed through the in-die punching assembly to complete punching of the positioning hole for laser cutting, the high-pressure liquid in the tube is used as a male die or a female die for punching, the punching assembly is used as a corresponding female die or male die, and a high-pressure oil way is from a main cylinder pipeline to a punching pipeline by adopting a valve body control; the method is characterized in that high-pressure liquid in a pipe is used as a female die, a punching assembly is used as a corresponding male die to rapidly and finely punch into the pipe, and the method belongs to a conventional punching mode, wherein punching burrs are inward, but the punching surface is easy to have collapse quality defects; the high-pressure liquid in the pipe is used as a male die, the punching assembly is used as a corresponding female die to quickly perform fine punching outside the pipe, the method belongs to a backflushing mode, the punching assembly firstly moves back and moves upwards after liquid filling is completed, a male die insert is used as a punching female die, the punching assembly moves downwards after punching is completed to eject waste beans, and a punching surface is not collapsed but punching burrs are outward;
(3) after punching is completed, the upper die and the lower die are released in the pipe, the die is opened, the liquid-filled hydraulic cylinder returns to pull the core rod away from the formed pipe, the upper die ejection cylinder moves downwards to prevent the formed pipe from being clamped on the upper die, and then the lower die ejection cylinder ejects the formed pipe out of the lower die cavity to complete a complete punching process.
In the above-mentioned liquid filling method, preferably, in the step (2), the punching hole uses the high-pressure liquid in the pipe as a male die, and the punching assembly as a corresponding female die.
Compared with the prior art, the invention saves a preforming die and punching times, eliminates collapse and wrinkles at two ends, uses hydraulic online punching as a positioning hole for laser cutting, simplifies the tooling, reduces the cutting cost, improves the precision and consistency of products, punches a hole outside the pipe to eliminate collapse of the punching surface, realizes quick replacement of a punch through a skylight and a connecting block, and saves a pair of flanging tooling by depending on a core rod and a female die for final forming at two end flanging, thereby avoiding the instability of seam allowance welding and the cost of laser cutting.
Drawings
FIG. 1 is a cross-sectional view of a lower die;
fig. 2 is a cross-sectional view of the upper mold.
Description of reference numerals: 1-upper die, 2-lower die, 3-upper die support plate, 4-upper die base plate, 5-punch insert, 6-punch holder, 7-punch assembly, 8-upper groove, 9-lower die support plate, 10-lower die base plate, 11-die insert, 12-die holder, 13-liquid-filled assembly, 14-punch, 15-mandrel, 16-punch fixing block, 17-punch backing plate, 18-connecting block, 19-punch hydraulic cylinder, 20-plug, 21-liquid-filled hydraulic cylinder, 22-die symbol block, 23-lower die ejection cylinder, 24-punch symbol block, 25-upper die ejection cylinder, 26-lower groove.
Detailed Description
The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
As shown in fig. 1 and 2, an embodiment of the present invention provides a liquid-filled forming mold, including an upper mold 1 and a lower mold 2, wherein:
the upper die 1 comprises an upper die supporting plate 3, an upper die base plate 4, a male die insert 5, a male die holder 6 and a punching assembly 7, wherein the upper die base plate 4 is fixed on the surface of the upper die supporting plate 3, the male die insert 5 is fixed in the male die holder 6, the male die holder 6 is fixed on the upper die base plate 4, and the top of the male die insert 5 is provided with an upper groove 8; the die insert 11 is installed in the die holder 12 through screws and pins, the periphery of the die holder is sealed through trapezoidal packaging keys, the periphery of the die holder 12 is fixed on the lower die base plate 10 through a large L-shaped pressing plate, and the die insert 11 does not move under high pressure in the forming process, so that the forming accuracy of parts is ensured, and accidents are prevented.
The lower die 2 comprises a lower die supporting plate 9, a lower die bottom plate 10, a die insert 11, a die holder 12 and a liquid filling assembly 13, the lower die bottom plate 10 is fixed on the surface of the lower die supporting plate 9, the die insert 11 is fixed in the die holder 12, the die holder 12 is fixed on the lower die bottom plate 10, and a lower groove 26 is formed in the top of the die insert 11; the male die insert 5 is installed in the male die holder 6 through screws and pins, the periphery of the male die holder is sealed through a trapezoidal f key, the periphery of the male die holder 6 is fixed on the upper die base plate 4 through a large L-shaped pressing plate, and the male die insert 5 does not move under high pressure in the forming process, so that the forming accuracy of parts is ensured, and accidents are prevented.
After the upper die 1 and the lower die 2 are assembled, a forming cavity is formed between the upper groove 8 and the lower groove 26 to provide a blank circular tube forming environment;
the punching assembly 7 comprises a punch 14 and a punching driving piece, the working end of the punching driving piece is connected with the top end of the punch 14, and the bottom end of the punch 14 is communicated with the top end of the forming cavity; the punching component 7 is provided with two, two the punching component 7 symmetry sets up, the punching driving piece includes drift fixed block 16, drift backing plate 17, connecting block 18 (buffering quick change device) and punching hydraulic cylinder 19, drift 14 loops through drift fixed block 16 drift backing plate 17 the connecting block 18 is fixed in punching hydraulic cylinder 19's work end. The punching hydraulic cylinder 19 is fixed on the upper die base plate 4, the connecting block 18 is in interference fit with the convex die holder 6, and the punch 14 is in interference fit with the convex die insert 5, so that the punching precision is improved, the punch 14 is prevented from being broken, and the punch 14 can be quickly replaced through the skylight convex die insert 5 and the buffering quick-change device in the production process.
The liquid filling assembly 13 comprises a core rod 15 and a liquid filling driving member, wherein a working end of the liquid filling driving member is connected with one end of the core rod 15, and the other end of the core rod 15 is communicated with a side end of the molding cavity. The two liquid filling assemblies 13 are symmetrically arranged at two opposite sides of the lower groove 26, the liquid filling driving member comprises a plug 20 and a liquid filling hydraulic cylinder 21, and the core rod 15 is fixed at the working end of the liquid filling hydraulic cylinder 21 through the plug 20.
The core rod 15 is connected with the plug 20 through a screw, a sealing ring is additionally arranged between the core rod 15 and the plug 20, the plug 20 is connected with a piston rod of a liquid-filled hydraulic cylinder 21 through a screw, and the liquid-filled hydraulic cylinder 21 is fixed on the lower die base plate 10 through an L-shaped pressing plate.
Further, the lower die 2 further comprises a lower die 2 ejection device, the lower die 2 ejection device comprises a female die symbol block 22 and a lower die ejection cylinder 23, the female die symbol block 22 is in clearance fit with the female die insert 11, a working end of the lower die ejection cylinder 23 is connected with the female die symbol block 22 to drive the female die symbol block 22 to extend into or out of the lower groove 26, and the female die symbol block 22 and the female die insert 11 are guided to slide through a thin guide plate, so that the smooth lifting and the clearance fit with the female die insert 11 are ensured.
Further, the upper die 1 further comprises an upper die 1 ejection device, the upper die 1 ejection device comprises a male die symbol block 24 and an upper die ejection cylinder 25, the male die symbol block 24 is in clearance fit with the male die insert 5, and a working end of the upper die ejection cylinder 25 is connected with the male die symbol block 24 so as to drive the male die symbol block 24 to extend into or out of the upper groove 8. The male die character-shaped block 24 and the male die insert 5 are guided to slide through the thin guide plate, so that the smooth lifting and the fit clearance with the male die insert 5 are ensured.
The invention also provides a liquid filling forming method, which comprises the following steps:
(1) during forming, a blank circular tube is placed in the lower groove 26, the liquid filling hydraulic cylinder 21 moves to insert the core rod 15 and the plug 20 into the end of the blank circular tube, the upper die 1 moves downwards along with the press to be matched, the core rod 15 flexibly deforms along with the descending of the punch insert 5 in the mould matching process to serve as a concave die medium, the punch insert 5 and the core rod 15 act to complete preforming, the preforming die and the punching frequency are saved, and meanwhile, collapse and wrinkles at two ends can be eliminated;
(2) after the die assembly is completed, the liquid-filled hydraulic cylinders 21 at the two ends begin to fill liquid into the blank circular tube to expand and form the preliminarily formed tube blank into a product state, the liquid-filled hydraulic cylinders 21 at the two ends increase the pressure to continue moving inwards, the end of the core rod 15 and the end of the female die insert 11 deform in a shape under the action of the large pressure to complete flanging, and after pressure maintaining, the in-die punching assembly 7 completes punching of a positioning hole for laser cutting, wherein the punching takes high-pressure liquid in the tube as a male die or a female die, the punching assembly 7 serves as a corresponding female die or a male die, and a high-pressure oil way adopts a valve body control technology from a main cylinder pipeline to a punching pipeline to realize quick fine punching outside or inside; the method is characterized in that high-pressure liquid in a pipe is used as a female die, a punching assembly 7 is used as a corresponding male die to rapidly and finely punch the pipe, and the method belongs to a conventional punching mode, wherein punching burrs are inward, but the punching surface is easy to have collapse quality defects; the high-pressure liquid in the pipe is used as a male die, the punching component 7 is used as a corresponding female die to quickly perform fine punching outside the pipe, the method belongs to a backflushing mode, the punching component 7 firstly moves back and moves upwards after liquid filling is completed, the male die insert 5 serves as a punching female die, the downward movement pushes out waste beans after punching is completed, and a punching surface is not collapsed but punching burrs are outward;
(3) after punching is completed, the upper die 2 and the lower die 2 are opened, the liquid filling hydraulic cylinder 21 returns to draw the core rod 15 away from the formed pipe, the upper die ejection cylinder 25 moves downwards to prevent the formed pipe from being clamped on the upper die 1, and then the lower die ejection cylinder 23 ejects the formed pipe out of the die cavity of the lower die 2 to complete a complete punching process.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (10)
1. The utility model provides a liquid-filled forming die which characterized in that, includes mould and lower mould, wherein:
the upper die comprises an upper die supporting plate, an upper die base plate, a male die insert, a male die holder and a punching assembly, wherein the upper die base plate is fixed on the surface of the upper die supporting plate, the male die insert is fixed in the male die holder, the male die holder is fixed on the upper die base plate, and the top of the male die insert is provided with an upper groove;
the lower die comprises a lower die supporting plate, a lower die bottom plate, a die insert, a die holder and a liquid filling assembly, the lower die bottom plate is fixed on the surface of the lower die supporting plate, the die insert is fixed in the die holder, the die holder is fixed on the lower die bottom plate, and a lower groove is formed in the top of the die insert;
after the upper die and the lower die are assembled, a forming cavity is formed between the upper groove and the lower groove;
the punching assembly comprises a punch and a punching driving piece, the working end of the punching driving piece is connected with the top end of the punch, and the bottom end of the punch is communicated with the top end of the forming cavity;
the liquid filling assembly comprises a core rod and a liquid filling driving piece, the working end of the liquid filling driving piece is connected with one end of the core rod, and the other end of the core rod is communicated with the side end of the forming cavity.
2. The liquid-filled forming die as claimed in claim 1, wherein there are two punching assemblies, the two punching assemblies are symmetrically arranged, the punching driving member comprises a punch fixing block, a punch backing plate, a connecting block and a punching hydraulic cylinder, and the punch is fixed to the working end of the punching hydraulic cylinder sequentially through the punch fixing block, the punch backing plate and the connecting block.
3. The liquid-filled forming die of claim 2, wherein the punching hydraulic cylinder is fixed to the upper die base plate, the connecting block is in interference fit with the punch holder, and the punch is in interference fit with the punch insert.
4. The liquid-filled forming die as claimed in claim 3, wherein there are two liquid-filled assemblies, the two liquid-filled assemblies are symmetrically disposed on opposite sides of the lower groove, the liquid-filled driving member includes a plug and a liquid-filled hydraulic cylinder, and the core rod is fixed to a working end of the liquid-filled hydraulic cylinder through the plug.
5. The liquid-filled forming die of claim 4, wherein a sealing ring is disposed between the core rod and the plug.
6. The liquid-filled forming mold according to claim 4, wherein the lower mold further comprises a lower mold ejection device, the lower mold ejection device comprises a female mold symbol block and a lower mold ejection cylinder, the female mold symbol block is in clearance fit with the female mold insert, and a working end of the lower mold ejection cylinder is connected with the female mold symbol block to drive the female mold symbol block to extend into or out of the lower groove.
7. The liquid-filled molding die of claim 6 wherein the female mold symbols and the female mold inserts are guided by a thin guide plate.
8. The liquid-filled molding die as claimed in claim 6, wherein the upper die further comprises an upper die ejection device, the upper die ejection device comprises a male die symbol block and an upper die ejection cylinder, the male die symbol block is in clearance fit with the male die insert, and a working end of the upper die ejection cylinder is connected with the male die symbol block to drive the male die symbol block to extend into or out of the upper groove.
9. A liquid-filled molding method using the liquid-filled molding die set forth in claim 8, comprising the steps of:
(1) during forming, a blank circular pipe is placed in the lower groove, the liquid filling hydraulic cylinder moves to insert the core rod and the plug into the end head of the blank circular pipe, the upper die moves downwards along with the press to be matched with the die, the core rod generates flexible deformation along with the downward movement of the male die insert in the die matching process and serves as a female die medium, and the male die insert and the core rod act to complete preforming;
(2) after the die assembly is completed, the liquid-filled hydraulic cylinders at two ends begin to fill liquid into the blank circular tube to expand and form the preliminarily formed tube blank into a product state, the liquid-filled hydraulic cylinders at two ends increase the pressure and continue to move inwards, the end of the mandrel and the end of the female die insert are subjected to conformal deformation forming under the action of the large pressure to complete flanging, and after pressure maintaining, punching of the positioning hole for laser cutting is completed through the in-die punching assembly, wherein the punching takes high-pressure liquid in the tube as a male die or a female die, and the punching assembly as a corresponding female die or a male;
(3) after punching is completed, the upper die and the lower die are released in the pipe, the die is opened, the liquid-filled hydraulic cylinder returns to pull the core rod away from the formed pipe, the upper die ejection cylinder moves downwards to prevent the formed pipe from being clamped on the upper die, and then the lower die ejection cylinder ejects the formed pipe out of the lower die cavity to complete a complete punching process.
10. The hydromechanical forming process of claim 9, wherein in step (2), the punch is formed by using the high pressure liquid in the tube as a male die and the punch assembly as a corresponding female die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010967855.7A CN112170610B (en) | 2020-09-15 | 2020-09-15 | Liquid-filling forming die and liquid-filling forming method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010967855.7A CN112170610B (en) | 2020-09-15 | 2020-09-15 | Liquid-filling forming die and liquid-filling forming method |
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| Publication Number | Publication Date |
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| CN112170610A true CN112170610A (en) | 2021-01-05 |
| CN112170610B CN112170610B (en) | 2021-12-14 |
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| Publication number | Publication date |
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| CN112170610B (en) | 2021-12-14 |
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