CN112893595B - Special die for low-pressure forming of bending axis pipe fitting - Google Patents
Special die for low-pressure forming of bending axis pipe fitting Download PDFInfo
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- CN112893595B CN112893595B CN202110047668.1A CN202110047668A CN112893595B CN 112893595 B CN112893595 B CN 112893595B CN 202110047668 A CN202110047668 A CN 202110047668A CN 112893595 B CN112893595 B CN 112893595B
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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
- B21D26/045—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
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 at the upper sides of the two die holders, the upper die plate is arranged at the upper side of the upper die, a rack is arranged at one end of the two die holders, a sliding rail is arranged at the upper side of the rack, a U-shaped sliding block is arranged at the upper side of the sliding rail, a pipe blank is arranged in a U-shaped groove of the U-shaped sliding block, sealing heads are arranged at two ends of the pipe blank, sealing cylinders are arranged on the rack, the sealing cylinders are connected with the sealing heads, pressing blocks are arranged at the outer sides of pipe blanks at the upper sides of the two die holders, the pressing blocks are connected with the upper die plates through nitrogen springs, a side pushing die is arranged at the inner side of the upper end of the die holders, and the side pushing die is connected with the die holders through the side pushing cylinders. The special die for low-pressure forming of the bent axis pipe fitting is easy to take out a formed part and easy to maintain a die cavity; the tube blank is flattened, clamped and formed into a whole, and the tube blank bending, flattening and compression forming procedures can be realized in a 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 bending axis pipe fitting.
Background
Internal high-pressure forming is being widely used in the fields of automobiles, aviation and the like as an international advanced manufacturing technology. In the internal high-pressure forming technology, expansion deformation is a main mode for forming a tube blank film, but the forming pressure in an expansion deformation mode is high, so that the production efficiency is greatly reduced; at the same time, the cost of the high pressure source and the press equipment is very high due to the high forming pressure.
The low-pressure upsetting and expanding forming of the pipe is a brand new pipe forming process [ patent name: a low-pressure upsetting and expanding forming method for a hollow member with a complex section comprises the following steps of: 201510999744.3], also known as a pressurized upsetting. Under the supporting action of the internal pressure, the mold clamping force of the mold enables the cross section of the tube blank to be bent and deformed firstly, then to be compressed and deformed, and finally to be attached to the mold. The process does not need high-pressure shaping, and realizes low-pressure shaping of the hollow member with the complex section. Because the process is in a compression deformation mode, the transition dependence on ultrahigh pressure is overcome. Mainly comprises the following steps: feeding, sealing, pressing down a die, increasing the internal pressure, closing the die, releasing pressure, opening the die and the like.
The form of the pressurizing upsetting mold is completely different from that of the traditional internal high-pressure forming, in order to open the mold and take out the piece, the traditional internal high-pressure forming is generally divided horizontally at the widest part of the section, a pipe such as a cavity is first clamped, and then the pressure is gradually increased to enable the pipe wall to be pasted with the film. In the low-pressure upsetting, in order to shorten the perimeter of the section, the pipe wall is attached to the lower mold cavity under the support of the internal pressure, and then the upper mold 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 is provided with 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.
When the die is pressurized and upsetted, the side wall of the die has certain elastic deformation, and after pressure relief, the elastic recovery enables the clamping force of the lower die cavity to the part to be large, so that great difficulty is caused in die opening and workpiece taking, and even the formed part is deformed to become waste. On the other hand, the lower die is in a female die form, and some impurities inevitably fall into the die cavity in the forming process, so that the cleaning is very difficult, and the production efficiency is affected.
Therefore, in order to solve the problems of difficult workpiece taking and difficult cleaning and the like caused by large depth of a lower model cavity in the pressurizing upsetting process of the bending axis, a novel pipe pressurizing upsetting special die is required 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 tube blank is flattened, clamped and formed into a whole, and the tube blank bending, flattening and compression forming procedures can be realized in a set of die.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a special mould of crooked axis pipe fitting low pressure shaping, includes cope match-plate pattern, die holder, lower bolster upside both ends are equipped with the die holder, and the two die holder upside is equipped with lower mould and cope match-plate pattern, and the cope match-plate pattern upside is equipped with the cope match-plate pattern, and two die holder one end all is equipped with the rack, and the rack upside is equipped with the slide rail, and the slide rail upside is equipped with the U-shaped slider, is equipped with the pipe blank in the U-shaped inslot of U-shaped slider, and the pipe blank both ends are equipped with sealed head, are equipped with sealed hydro-cylinder on the rack, and sealed hydro-cylinder is connected with sealed head, and two die holder upside pipe blank outsides all are equipped with the briquetting, pass through nitrogen spring coupling between briquetting and the cope match-plate pattern, and die holder upper end inboard is equipped with the side push away the mould, is connected through the side push hydro-cylinder between side push mould and the die holder.
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.
Further, the pressing block is omega-shaped, and the radius of an arc on the omega-shaped is larger than that of the tube blank.
Further, round angle inserts are arranged at the round angle cutting edge of the upper die and the round angle cutting edge of the lower die, and the round angle inserts are made of die steel or copper alloy
Further, the through hole is formed in the sealing head and is connected with the high-pressure pipe.
Further, the sealing head is connected with or not connected with the sealing oil cylinder.
Further, the slide block is provided with electrodes in the resistance heating device, and the tube blank can be heated to 600-1200 ℃.
The invention has the following beneficial effects: the special die for low-pressure forming of the bent axis pipe fitting is easy to take out a formed part and easy to maintain a die cavity; the tube blank is flattened, clamped and formed into a whole, and the tube blank bending, flattening and compression forming procedures can be realized in a set of die. The pre-forming die is omitted, the working procedures are reduced, the cost is reduced, and the production efficiency is improved. Compared with the existing pressurizing upsetting deep cavity die, the die is split left and right, horizontal machining of the lower die surface can be achieved, numerical control machining difficulty is reduced, and meanwhile surface roughness of a machined surface is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a second cross-sectional view of the present invention;
FIG. 4 is a schematic diagram of the side push completion status of the present invention;
fig. 5 is a schematic diagram of the invention in a fully closed state.
Wherein: 1. the upper die 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 pushing oil cylinder, 7, a side pushing die, 8, a lubricating plate, 9, a round corner insert, 10, a pressing block, 11, a nitrogen spring, 12, a sealing head, 13, a sealing oil cylinder, 14, a rack, 15, a sliding rail, 16 and a U-shaped sliding block.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings.
As shown in figures 1-5, the special die for low-pressure forming of the bending 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 at the upper sides of the two die holders 4, the upper die plate 2 is arranged at the upper side of the upper die 1, a rack 14 is arranged at one end of the two die holders, a sliding rail 15 is arranged at the upper side of the rack 14, a U-shaped sliding block 16 is arranged at the upper side of the sliding rail 15, a pipe blank is arranged in a U-shaped groove of the U-shaped sliding block 16, sealing heads 12 are arranged at two ends of the pipe blank, sealing cylinders 13 are arranged on the rack 14, the sealing cylinders 13 are connected with the sealing heads 12, pressing blocks 10 are arranged at the outer sides of pipe blanks at the upper sides of the two die holders 4, the pressing blocks 10 are connected with the upper die plates 2 through nitrogen springs 11, side pushing dies 7 are arranged at the inner sides of the upper ends of the die holders 4, and the side pushing dies 7 are connected with the die holders 4 through side pushing cylinders 6.
The upper die plate 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 pushing die 7 and the die holder 4.
The pressing block 10 is omega-shaped, and the radius of an arc on the omega-shaped is larger than that of the tube blank.
The sealing head 12 is internally provided with a through hole which is connected with a high-pressure pipe.
The sealing head 12 is connected with or not connected with the sealing oil cylinder 13.
The slide block is provided with electrodes in the resistance heating equipment, and can heat the tube blank to 600-1200 ℃.
The die of the invention can be used for pipe fitting thermoforming process.
The side pushing oil cylinder 6 pushes the side pushing die 7 to move, and after the side pushing die 7 moves horizontally in place, the side pushing die 7 and the molded surface of the lower die 3 form an L shape.
After the sealing head 12 is fed to a certain position, the ejector rod can limit the displacement of the sealing head 12, and the sealing head 12 still meets the sealing requirement relative to a part of the tube blank.
The upper die 1 moves downward, the tube blank is bent with it, and both ends of the tube are fed toward the middle. And calculating the matching relation between the displacement of the upper die 1 and the feeding displacement of the sealing head 12, and extending the sealing 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 closing position, the inner pressure p1 is filled, the tube wall is gradually attached to the die surface, and 1MPa < p1<12MPa. If the section circumference of the formed piece is the same as the tube blank circumference, the p1 internal pressure is adopted until the die closing is finished. If the section circumference of the formed piece is smaller than the tube blank circumference, the internal pressure is increased to p2 when the upper die moves to 0.05D-0.5D from the die clamping position, and then the die clamping is finished.
And (3) pressure relief, 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 person who can learn the structural changes made under the teaching of the present invention can fall within the scope of the present invention if the present invention has the same or similar technical solutions.
The technology, shape, and construction parts of the present invention, which are not described in detail, are known in the art.
Claims (2)
1. A special mould for low-pressure forming of a bending axis pipe fitting is characterized in that: the die 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 the two die holders, a sliding rail is arranged on the upper side of the rack, a U-shaped sliding block is arranged on the upper side of the sliding rail, a tube blank is arranged in a U-shaped groove of the U-shaped sliding block, sealing heads are arranged at two ends of the tube blank, a sealing oil cylinder is arranged on the rack and connected with the sealing heads, pressing blocks are arranged on the outer sides of tube blanks on the upper sides of the two die holders, the pressing blocks are connected with the upper die plates through nitrogen springs, and a side pushing die is arranged on the inner side of the upper end of the die holder and is connected with the die holders through the side pushing oil cylinder; the upper die is in an inverted L shape; round angle inserts are arranged at the round angle cutting edge of the upper die and the round angle cutting edge of the lower die, and the round angle inserts are made of die steel or copper alloy;
the upper die plate and the upper die are fixed through bolts; 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;
the pressing block is omega-shaped, and the radius of an arc on the omega-shaped part is larger than the radius of the tube blank;
the sealing head is internally provided with a through hole which is connected with the high-pressure pipe;
the slide block is provided with electrodes in the resistance heating equipment, and can heat the tube blank to 600-1200 ℃.
2. The special die for low-pressure forming of the bending axis pipe fitting according to claim 1, wherein the special die is characterized in that: the sealing head is connected with or not connected with the sealing oil cylinder.
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 |
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| Publication Number | Publication Date |
|---|---|
| CN112893595A CN112893595A (en) | 2021-06-04 |
| CN112893595B true CN112893595B (en) | 2023-06-16 |
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| 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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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020051814A1 (en) * | 2018-09-13 | 2020-03-19 | 大连理工大学 | Method for shaping special pipe fitting having connection edge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| IT1250551B (en) * | 1991-12-20 | 1995-04-20 | Fiat Auto Spa | METAL SHEET METAL SHEET PROCESS OF THE FLUID BED TYPE. |
| CN102139304B (en) * | 2010-11-17 | 2013-06-26 | 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 |
| CN102716964B (en) * | 2012-06-30 | 2015-03-11 | 惠州市金山电子有限公司 | Metal vibration film forming equipment |
| CN109092966B (en) * | 2018-07-13 | 2019-10-22 | 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 |
| CN110935779B (en) * | 2019-12-13 | 2021-05-28 | 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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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020051814A1 (en) * | 2018-09-13 | 2020-03-19 | 大连理工大学 | Method for shaping special pipe fitting having connection edge |
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