CN112893595A - Special mould for low-pressure forming of bent axis pipe fitting - Google Patents
Special mould for low-pressure forming of bent axis pipe fitting Download PDFInfo
- Publication number
- CN112893595A CN112893595A CN202110047668.1A CN202110047668A CN112893595A CN 112893595 A CN112893595 A CN 112893595A CN 202110047668 A CN202110047668 A CN 202110047668A CN 112893595 A CN112893595 A CN 112893595A
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- Prior art keywords
- die
- low
- pipe fitting
- pressure forming
- special
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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
- B21D26/045—Closing or sealing means
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a special die for low-pressure forming of a bent axis pipe fitting, which comprises an upper die, an upper die plate, die holders and a lower die plate, wherein the die holders are arranged at two ends of the upper side of the lower die plate, the lower die and the upper die are arranged on the upper sides of the two die holders, the upper die plate is arranged on the upper side of the upper die, a rack is arranged at one end of each die holder, a slide rail is arranged on the upper side of the rack, a U-shaped slide block is arranged on the upper side of the slide rail, a pipe blank is arranged in a U-shaped groove of the U-shaped slide block, sealing heads are arranged at two ends of the pipe blank, a sealing oil cylinder is arranged on the rack and connected with the sealing heads, pressing blocks are arranged. The special die for low-pressure forming of the bent axis pipe fitting has the advantages that a formed part is easy to take out, and a die cavity is easy to maintain; the flattening and die-closing forming of the tube blank are integrated, and the processes of bending, flattening and pressure forming of the tube blank can be realized in one set of die.
Description
Technical Field
The invention relates to the field of dies, in particular to a special die for low-pressure forming of a bent axis pipe fitting.
Background
Internal high pressure forming is becoming widely used in the fields of automobiles, aviation, and the like as an international advanced manufacturing technology. In the internal high-pressure forming technology, the expansion deformation is a main mode for pasting and forming the film on the tube blank, but the forming pressure of the expansion deformation mode is high, so that the production efficiency is greatly reduced; at the same time, the costs of the high-pressure source and the press equipment are very high due to the high forming pressure.
The low-pressure upsetting-bulging forming of the pipe is a brand-new pipe forming process [ patent name: a low-pressure upsetting-bulging forming method for a hollow component with a complex section is disclosed in the application number: 201510999744.3], also known as a charging upset. Under the supporting action of the internal pressure, the mold clamping force enables the section of the tube blank to be subjected to bending deformation firstly and then to be subjected to compression deformation, and finally the tube blank is attached to the mold. The process does not need high-pressure shaping, and realizes low-pressure forming of the hollow component with the complex section. Because the process is in a compression deformation mode, the transition dependence on ultrahigh pressure is overcome. The method mainly comprises the following steps: loading, sealing, pressing down the die, increasing the internal pressure, closing the die, relieving the pressure, opening the die and the like.
The form of the pressurizing heading die is completely different from that of the traditional internal high-pressure forming, in order to open the die and take a workpiece, the die is horizontally split at the widest part of the section, the die is firstly closed to form a pipe such as a cavity, and then the pressure is gradually increased to enable the pipe wall to be pasted with a film. In the low-pressure heading, in order to shorten the perimeter of the section, the pipe wall is attached to the lower die cavity under the support of internal pressure, and then the upper die applies a deformation driving force in the vertical direction to the section. The upper die is in a male die form, and the lower die is in a female die form; the lower die has two vertical walls, and if the fall of the axis of the pipe fitting in the vertical direction is large, the cavity of the female die is very deep.
The side wall of the female die has certain elastic deformation during pressurizing and upsetting, and after pressure relief, the elastic recovery enables the clamping force of the lower die cavity on parts to be very large, so that great difficulty is caused in opening the die and taking the parts, and even the formed parts can deform to become waste products. On the other hand, the lower die is in a female die form, so that some impurities inevitably fall into the cavity in the forming process, the cleaning is very difficult, and the production efficiency is influenced.
Therefore, in order to solve the problems of difficult workpiece taking and cleaning and the like caused by the large depth of the lower die cavity in the pressurizing and upsetting process of the bending axis, a new special die for pressurizing and upsetting the pipe needs to be provided.
Disclosure of Invention
The invention aims to provide a special die for low-pressure forming of a bending axis pipe fitting, a formed part is easy to take out, and a die cavity is easy to maintain; the flattening and die-closing forming of the tube blank are integrated, and the processes of bending, flattening and pressure forming of the tube blank can be realized in one set of die.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a special mould of crooked axis pipe fitting low pressure forming, including last mould, cope match-plate pattern, die holder, the lower bolster, lower bolster upside both ends are equipped with the die holder, two die holder upsides are equipped with lower mould and last mould, it is equipped with the cope match-plate pattern to go up the mould upside, two die holder one end all is equipped with the rack, the rack upside is equipped with the slide rail, the slide rail upside is equipped with the U-shaped slider, the U-shaped inslot of U-shaped slider is equipped with the pipe, the pipe both ends are equipped with sealed head, be equipped with sealed hydro-cylinder on the rack, sealed hydro-cylinder is connected with sealed head, the two die holder upside pipe outsides all are equipped with the briquetting, pass through nitrogen spring between.
Further, the upper die plate and the upper die are fixed through bolts.
Further, the upper die is in an inverted L shape.
Further, a lubricating plate is arranged between the upper die and the die holder, and a lubricating plate is arranged between the side pushing die and the die holder.
Furthermore, the pressing block is in an omega shape, and the radius of an upper arc of the omega shape is larger than that of the pipe blank.
Furthermore, fillet inserts are arranged at the upper die fillet cutting edge and the lower die fillet cutting edge, and are made of die steel or copper alloy
Furthermore, a through hole is formed in the sealing head and connected with the high-pressure pipe.
Furthermore, the sealing head is connected or disconnected with the sealing oil cylinder.
Further, the slide block is provided with an electrode in resistance heating equipment, and the tube blank can be heated to 600-1200 ℃.
The invention has the following beneficial effects: according to the special low-pressure forming die for the bending axis pipe fitting, a formed part is easy to take out, and a die cavity is easy to maintain; the flattening and die-closing forming of the tube blank are integrated, and the processes of bending, flattening and pressure forming of the tube blank can be realized in one set of die. The pre-forming die is eliminated, the working procedures are reduced, the cost is reduced, and the production efficiency is improved. Compared with the existing pressurizing upsetting deep cavity female die, the die is split left and right, so that the horizontal processing of the lower die molded surface can be realized, the numerical control processing difficulty is reduced, and the surface roughness of the processing surface is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a first cross-sectional view of the present invention;
FIG. 3 is a cross-sectional view of the second embodiment of the present invention;
FIG. 4 is a schematic view of the side push completion status of the present invention;
FIG. 5 is a schematic view of the present invention in a fully clamped condition.
Wherein: 1. the device comprises an upper die, 2, an upper die plate, 3, a lower die, 4, a die holder, 5, a lower die plate, 6, a side push oil cylinder, 7, a side push die, 8, a lubricating plate, 9, a fillet insert, 10, a pressing block, 11, a nitrogen spring, 12, a sealing head, 13, a sealing oil cylinder, 14, a rack, 15, a slide rail, 16 and a U-shaped slide block.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-5, a special die for low-pressure forming of a bent axis pipe fitting comprises an upper die 1, an upper die plate 2, die holders 4 and a lower die plate 5, wherein the die holders 4 are arranged at two ends of the upper side of the lower die plate 5, the lower die 3 and the upper die 1 are arranged on the upper sides of the two die holders 4, the upper die plate 2 is arranged on the upper side of the upper die 1, a rack 14 is arranged at one end of each of the two die holders, a slide rail 15 is arranged on the upper side of the slide rail 15, a pipe blank is arranged in a U-shaped groove of the U-shaped slide block 16, sealing heads 12 are arranged at two ends of the pipe blank, a sealing oil cylinder 13 is arranged on the rack 14, the sealing oil cylinder 13 is connected with the sealing heads 12, pressing blocks 10 are arranged on the outer sides of the pipe blank on the two die holders 4, the pressing blocks 10.
The upper template 2 and the upper die 1 are fixed through bolts.
The upper die is in an inverted L shape.
A lubricating plate 8 is arranged between the upper die 1 and the die holder 4, and a lubricating plate 8 is arranged between the side push die 7 and the die holder 4.
The pressing block 10 is in an omega shape, and the radius of an upper arc of the omega shape is larger than that of the pipe blank.
The fillet insert 9 is arranged at the fillet cutting edge of the upper die 1 and the fillet cutting edge of the lower die, and the fillet insert 9 is die steel or copper alloy
And a through hole is formed in the sealing head 12 and is connected with a high-pressure pipe.
The sealing head 12 is connected or disconnected with the sealing oil cylinder 13.
The slide block is provided with an electrode in resistance heating equipment, and the tube blank can be heated to 600-1200 ℃.
The die of the invention can be used for the pipe fitting hot forming process.
The side push oil cylinder 6 pushes the side push mold 7 to move, and after the side push mold 7 horizontally moves in place, the side push mold 7 and the molded surface of the lower mold 3 form an L shape.
After the sealing head 12 is fed to a certain position, the displacement of the sealing head 12 can be limited by the ejector rod, and the sealing head 12 slides out of a part relative to the tube blank to meet the sealing requirement.
The upper die 1 moves downwards, the tube blank bends along with the upper die, and the two ends of the tube are fed towards the middle. And calculating the matching relation between the displacement of the upper die 1 and the feed displacement of the sealing head 12, extending the sealing oil cylinder 12 to the position of the sealing head 11 before pressurizing, and applying thrust.
When the upper die 1 moves to a position 0.5D-2D away from the die assembly position, the internal pressure p1 is filled, and the tube wall is gradually attached to the molded surface of the die, wherein 1MPa is more than p1 and less than 12 MPa. If the circumference of the cross section of the formed part is the same as the circumference of the tube blank, the internal pressure of p1 is used until the clamping is finished. When the cross-sectional circumference of the formed product is smaller than the circumference of the tube blank, the internal pressure is increased to p2 when the upper die moves to a position 0.05D to 0.5D away from the die-clamping position, and then the die-clamping is completed.
And (3) releasing pressure, lifting the upper die 1, retracting the sealing oil cylinder, retracting the side-pushing oil cylinder, and taking out the part.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (9)
1. The utility model provides a special mould of crooked axis pipe fitting low pressure shaping which characterized in that: including last mould, cope match-plate pattern, die holder, lower bolster upside both ends are equipped with the die holder, two die holder upsides are equipped with lower mould and last mould, it is equipped with the cope match-plate pattern to go up the mould upside, two die holder one end all is equipped with the rack, the rack upside is equipped with the slide rail, the slide rail upside is equipped with the U-shaped slider, the U-shaped inslot of U-shaped slider is equipped with the pipe, the pipe both ends are equipped with sealed head, be equipped with sealed hydro-cylinder on the rack, sealed hydro-cylinder is connected with sealed head, the pipe outside all is equipped with the briquetting on two die holders, pass through nitrogen spring and be connected between briquetting and the cope match.
2. The special die for low-pressure forming of the bent axis pipe fitting according to claim 1, wherein: the upper template and the upper die are fixed through bolts.
3. The special die for low-pressure forming of the bent axis pipe fitting according to claim 1, wherein: the upper die is in an inverted L shape.
4. The special die for low-pressure forming of the bent axis pipe fitting according to claim 1, wherein: a lubricating plate is arranged between the upper die and the die holder, and a lubricating plate is arranged between the side push die and the die holder.
5. The special die for low-pressure forming of the bent axis pipe fitting according to claim 1, wherein: the pressing block is in an omega shape, and the radius of an upper arc of the omega shape is larger than that of the pipe blank.
6. The special die for low-pressure forming of the bent axis pipe fitting according to claim 1, wherein: and fillet inserts are arranged at the upper die fillet cutting edge and the lower die fillet cutting edge, and are made of die steel or copper alloy.
7. The special die for low-pressure forming of the bent axis pipe fitting as claimed in claim, wherein: and a through hole is formed in the sealing head and is connected with the high-pressure pipe.
8. The special die for low-pressure forming of the bent axis pipe fitting according to claim 1, wherein: the sealing head is connected or disconnected with the sealing oil cylinder.
9. The special die for low-pressure forming of the bent axis pipe fitting according to claim 1, wherein: the slide block is provided with an electrode in resistance heating equipment, and the tube blank can be heated to 600-1200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110047668.1A CN112893595B (en) | 2021-01-14 | 2021-01-14 | Special die for low-pressure forming of bending axis pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110047668.1A CN112893595B (en) | 2021-01-14 | 2021-01-14 | Special die for low-pressure forming of bending axis pipe fitting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112893595A true CN112893595A (en) | 2021-06-04 |
| CN112893595B CN112893595B (en) | 2023-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110047668.1A Active CN112893595B (en) | 2021-01-14 | 2021-01-14 | Special die for low-pressure forming of bending axis pipe fitting |
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| Country | Link |
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| CN (1) | CN112893595B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0549955A1 (en) * | 1991-12-20 | 1993-07-07 | FIAT AUTO S.p.A. | Method of the fluidised bed type for the shaping of sheet metal |
| CN102139304A (en) * | 2010-11-17 | 2011-08-03 | 安徽工业大学 | Thermal hydro-mechanical drawing forming method for dot matrix self-impedance electrical heating plates |
| CN102601206A (en) * | 2012-03-02 | 2012-07-25 | 张家港合瑞车桥有限公司 | Hydraulic bulging pipe end sealing device |
| CN102716964A (en) * | 2012-06-30 | 2012-10-10 | 惠州市金山电子有限公司 | Metal vibration film forming equipment |
| CN109092966A (en) * | 2018-07-13 | 2018-12-28 | 南京航空航天大学 | A kind of quick inflatable device and method of multilayer pipe auxiliary of dissimilar material curved surface pipe fitting |
| WO2020051814A1 (en) * | 2018-09-13 | 2020-03-19 | 大连理工大学 | Method for shaping special pipe fitting having connection edge |
| CN110935779A (en) * | 2019-12-13 | 2020-03-31 | 哈尔滨工大海卓智能成形科技有限公司 | Pipe liquid-filling multidirectional extrusion forming device and method |
-
2021
- 2021-01-14 CN CN202110047668.1A patent/CN112893595B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0549955A1 (en) * | 1991-12-20 | 1993-07-07 | FIAT AUTO S.p.A. | Method of the fluidised bed type for the shaping of sheet metal |
| CN102139304A (en) * | 2010-11-17 | 2011-08-03 | 安徽工业大学 | Thermal hydro-mechanical drawing forming method for dot matrix self-impedance electrical heating plates |
| CN102601206A (en) * | 2012-03-02 | 2012-07-25 | 张家港合瑞车桥有限公司 | Hydraulic bulging pipe end sealing device |
| CN102716964A (en) * | 2012-06-30 | 2012-10-10 | 惠州市金山电子有限公司 | Metal vibration film forming equipment |
| CN109092966A (en) * | 2018-07-13 | 2018-12-28 | 南京航空航天大学 | A kind of quick inflatable device and method of multilayer pipe auxiliary of dissimilar material curved surface pipe fitting |
| WO2020051814A1 (en) * | 2018-09-13 | 2020-03-19 | 大连理工大学 | Method for shaping special pipe fitting having connection edge |
| CN110935779A (en) * | 2019-12-13 | 2020-03-31 | 哈尔滨工大海卓智能成形科技有限公司 | Pipe liquid-filling multidirectional extrusion forming device and method |
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| Publication number | Publication date |
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| CN112893595B (en) | 2023-06-16 |
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