CN107952860A - It is a kind of to prevent the fracture of magnetic field impulse projecting apertures fillet and thinned method - Google Patents
It is a kind of to prevent the fracture of magnetic field impulse projecting apertures fillet and thinned method Download PDFInfo
- Publication number
- CN107952860A CN107952860A CN201711068819.1A CN201711068819A CN107952860A CN 107952860 A CN107952860 A CN 107952860A CN 201711068819 A CN201711068819 A CN 201711068819A CN 107952860 A CN107952860 A CN 107952860A
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- China
- Prior art keywords
- magnetic field
- coil
- field impulse
- projecting apertures
- fillet
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- B21D26/14—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces applying magnetic forces
-
- 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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
- B21D19/088—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for flanging holes
Abstract
It is a kind of to prevent the fracture of magnetic field impulse projecting apertures fillet and thinned method, include the following steps：Step 1: determine the center of circle of circular cross-esction；Step 2: processing pre-manufactured hole；Step 3: the position of any one corresponding pre-manufactured hole, installation mold and coil；Step 4: projecting apertures shapes；Step 5: dismounting mould and part；Step 6: parts to be processed surface is polished and cleared up with emery cloth, with the diameter dimension of the flanging bore generated in slide calliper rule detecting step four, the thickness at magnetic field impulse projecting apertures position is checked with outside micrometer；If thinning or crackle occurs in magnetic field impulse projecting apertures deformed area position, by reducing internal diameter, the outside diameter of coil, three~step 5 of repeat step, until magnetic field impulse projecting apertures fillet position occurs without thinning or crackle；The problem of method of the present invention is for solving in carrier rocket propellant tank circular hole magnetic field impulse turn-up process, thinning or fracture easily being produced at fillet position.
Description
Technical field
Prevent the fracture of magnetic field impulse projecting apertures fillet and thinned method the present invention relates to a kind of.
Background technology
Carrier rocket fuel tank includes oxidant and fuel tank, is all manufactured using aluminium alloy, and store-vessel bottom uses
Melon valve and head cover welding structure, there is several circular cross-esctions in bottom, and part material thickness, flange bore dia and position are respectively not
It is identical.Structure after simplification is as shown in Figure 1, such circular cross-esction can use magnetic field impulse projecting apertures forming technique to complete.
Magnetic pulse forming techniques are a kind of high-duty technologies for making material deform by electromagnetic force, various with shaping
The function of circular cross-esction, for magnetic field impulse projecting apertures technology with less investment, mould is simple, the features such as product is fast is obtained, in new model development
In played important function.
Magnetic pulse formation power derives from electromagnetic force, is mutual by sensing electric current by the electric current in coil and in piece surface
What effect produced, electromagnetic force is generally perpendicular to plate, and for blank under the action of electromagnetic force, high-speed motion, is then subjected to mould
Stop the deformation that collides.
When carrying out projecting apertures processing using magnetic pulse technology, especially it is more than 4mm in wall thickness, circular cross-esction diameter is less than 70mm
When, due to blank and mould collision when, blank thickness deforms, and is especially easily broken and is thinned at fillet position
Problem, influences product quality.
The content of the invention
The technical problem to be solved in the present invention is：On the basis of magnetic field impulse projecting apertures technology, there is provided a kind of pre- antimagnetic arteries and veins
The fracture of projecting apertures fillet and thinned method are rushed, for solving in carrier rocket propellant tank circular hole magnetic field impulse turn-up process,
Fillet position easily produces the problem of thinning or fracture, so as to ensure that product quality and development progress.
The technical solution adopted in the present invention is：A kind of method prevented the fracture of magnetic field impulse projecting apertures fillet and be thinned, including
Following steps：
Step 1: according to the flange hole site of drawings marked, it is true in parts to be processed surface punch according to positioning templet
Determine the center of circle of circular cross-esction structure；
Step 2: centered on the center of circle of circular cross-esction structure, pre-manufactured hole line and die shape line are drawn with planing, is processed
Go out pre-manufactured hole, and polished with file and sand paper, polish prefabricated bore edges；
Step 3: the position of any one corresponding pre-manufactured hole, parts to be processed both sides are individually positioned in by mould, coil；
Part locating piece is installed in the hole to be processed of part to be processed, on the coil brace in coil, by mold positioning ring
The compressing component locating piece in the central through hole of mould, mold positioning ring, part locating piece, line are sequentially passed through using screw rod
Coil support, backing plate, are fixed in screw rod end with nut；Upper cover plate is fixed on mould, compaction mold；
Step 4: coil is connected with magnetic field impulse equipment output end, equipment power supply, charging, electric discharge, at pre-manufactured hole are opened
Form circular cross-esction structure；
Step 5: dismounting upper cover plate, mould, coil and part；
Step 6: polished with emery cloth and clear up piece surface, with the diameter of the flanging bore generated in slide calliper rule detecting step four
Size, the thickness at magnetic field impulse projecting apertures position is checked with outside micrometer；If magnetic field impulse projecting apertures deformed area position occur it is thinning or
Crackle, then reduce internal diameter, the outside diameter of coil, three~step 5 of repeat step, until the arc flange of the magnetic field impulse projecting apertures of generation
Structure does not occur thinning or crackle.
In the step 2, prefabricated bore dia d0Calculation formula it is as follows：
d0=d1-2(H-0.43r-0.22δ)
In formula：d1For flanging bore internal diameter；R is circular cross-esction structure inner bend radius；δ is that the blank of parts to be processed is thick
Degree；H is part height after flange.
The coil uses the sectional area with insulating layer to be made of 6~10 square millimeters of conducting wire or cable, in coil
Footpath D1 is smaller 10mm~20mm than pre-manufactured hole D2, and coil turn is 5~8 circles.
The present invention compared with prior art the advantages of be：
(1) heavy wall (being more than 4mm) of the invention for being directed to carrier rocket store-vessel bottom flange circular cross-esction structure, aperture are small
The characteristics of (being less than 70mm), aluminum alloy materials plasticity are poor, hardly possible shaping, innovatively proposes one kind by controlling electromagnetic force
The method of point, solves that the wall thickness often occurred at the fillet position of circular cross-esction in magnetic field impulse turn-up process is thinning serious to ask
Topic, realizes overall application of the magnetic field impulse projecting apertures in certain Project R＆D.
(2) loop construction that the present invention is directed in magnetic field impulse projecting apertures technology is improved, by varying coil internal-and external diameter
Size, the application point of electromagnetic force is moved inward, and reduces the active force at fillet position, so that it is thinning to reduce fillet position
Trend, while be conducive to circular cross-esction shaping, improve the efficiency of circular cross-esction and the forming limit of material.Magnetic arteries and veins can be expanded
The application range of projecting apertures technology is rushed, for the thickness around the circular cross-esction of diameter of phi 70mm, deformed minimum thickness can be with
More than 4mm is brought up to from current 3.5mm.
(3) for manufacturing process of the invention compared with traditional die forming method, which not only has mould letter
The advantages of single, flexible, product manufacturing is fast, and it is low using product shaping precision height, the production cost of this method production, and
Fast reaction can be made to design variation.Multi items especially in aerospace field, under the production model of small lot, have
It is widely applied prospect.
Brief description of the drawings
Fig. 1 simplifies structure for circular cross-esction；
Fig. 2 is the location diagram (partial enlarged view of Fig. 3) of coil and part to be processed；
Fig. 3 is magnetic field impulse projecting apertures building mortion structure chart；
Fig. 4 is the process flow chart of the method for the present invention.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
Prevent the fracture of magnetic field impulse projecting apertures fillet and thinned building mortion, as shown in figure 3, including mould 2 and coil 9, mould
Tool 2 is circular disk, and in terms of the angle of cross section, hole wall of 2 central through hole of mould at port is arc, in part to be processed
Coil 9 is placed in inner side, and mould 2, the upper cover plate 1 installed above of mould 2, the installation of 9 bottom of coil are placed in the outside of part to be processed
There is backing plate 7；Part locating piece 4 is installed in the hole to be processed of part to be processed, on the coil brace 5 in coil 9, mould
Locating ring 3 is installed on compressing component locating piece 4 in the central through hole of mould 2, fixed through mold positioning ring 3, part using screw rod 6
Position block 4, the center of coil brace 5, connecting mold 2, part to be processed and coil 9,6 end of screw rod is fixed using nut 8.Part
Locating piece 4 is the disc structure that through hole is provided with along central shaft, and the annular convex platform of outwardly convex of one middle side part of disc structure is annular
Boss is coaxial with disc structure；Mold positioning ring 3 is provided with the disc structure of stepped hole along central shaft, and one middle side part of disc structure has
The annular convex platform of outwardly convex, annular convex platform are coaxial with disc structure；
Fig. 4 is process flow chart of the present invention, using magnetic field impulse projecting apertures technology processing carrier rocket store-vessel bottom zero
Part circular cross-esction, while ensure that the method for being seriously thinned or being broken does not occur for fillet part thickness, include the following steps：
Step 1: part to be processed is got out, according to the flange hole site of drawings marked, according to positioning templet in parts list
Face, the center of circle of circular cross-esction is determined with punch；
Step 2: centered on the center of circle of circular cross-esction, pre-manufactured hole line and die shape line are drawn with planing, is cut with water
Cut, the tool processes such as electric saw go out pre-manufactured hole, and polished with file and sand paper, polish prefabricated bore edges, prefabricated bore dia d0Meter
Calculation method is shown in following equation
d0=d1-2(H-0.43r-0.22δ)
In formula, d1For flanging bore internal diameter；R is flanging bore inner bend radius；δ is the blank thickness of parts to be processed；H is to turn over
Part height behind side.
Step 3: processing coil.With the conducting wire or cable processing line that the sectional area with insulating layer is 6-10 square millimeters
Circle, internal coil diameter D1 about 10-20mms smaller than pre-manufactured hole D2, coil turn 5-8 circles.
Step 4: processed part, mould 2 and coil 9 etc. are installed according to shown in Fig. 3, with bolt 6, backing plate 7 and spiral shell
Mother 8 fixes.
Step 5: projecting apertures shapes.Coil 2 is connected with magnetic field impulse equipment output end, opens equipment power supply, charging, electric discharge；
Step 6: dismounting mould 2, coil 9 and part.
Step 7: examine.Piece surface is polished and cleared up with emery cloth, projecting apertures diameter dimension is detected with slide calliper rule, with outside diameter thousand
Ruler is divided to check the thickness at projecting apertures position.If thinning or crackle occurs in magnetic field impulse projecting apertures fillet position, reduce the interior of coil 9
Footpath, outside diameter, three~step 5 of repeat step, until the arc turnup structure of the magnetic field impulse projecting apertures of generation does not occur thinning or splits
Line.
This invention takes thickness progress of 2 measures such as Mobile electromagnetic power center and control electromagnetic force size to deformed area
Control, the centre electromagnetic force of big path of the plate coil in discharge process in coil is maximum, this maximum point and deformation material
The center of the big path of the relative position of material, i.e. coil and the distance of prefabricated bore edges are Δ, as shown in Figure 2.Δ is big, electromagnetic force
Center and pre-manufactured hole Edge Distance increase, and the application point of power levels off to fillet position, under the action of electromagnetic force, parts to be processed
Collide with mould 2, the thickness of parts to be processed deforms and is thinned or even is broken.In order to avoid fillet position is thinning or
The generation of person's phenomenon of rupture makes electromagnetic force center be moved to prefabricated bore edges, under the action of electromagnetic force, both, it is necessary to reduce Δ
Circular cross-esction processing is completed, the thickness at fillet position is also guaranteed.
Tested, different Δ values is compared, by experimental check, with electromagnetic force according to above-mentioned analysis
The offset of action center, thinning at fillet and phenomenon of rupture gradually mitigate with the diminution of Δ value.Therefore, by adjusting Δ value,
Deformed area material wall thickness is thinning and crack conditions are controlled.
Unspecified part of the present invention belongs to technology well known to those skilled in the art.
Claims (3)
1. a kind of prevent the fracture of magnetic field impulse projecting apertures fillet and thinned method, it is characterised in that includes the following steps：
Step 1: according to the flange hole site of drawings marked, determine to justify with punch on parts to be processed surface according to positioning templet
The center of circle of hole flanging structure；
Step 2: centered on the center of circle of circular cross-esction structure, pre-manufactured hole line and die shape line are drawn with planing, is processed pre-
Drilling, and polished with file and sand paper, polish prefabricated bore edges；
Step 3: the position of any one corresponding pre-manufactured hole, parts to be processed two is individually positioned in by mould (2), coil (9)
Side；Part locating piece (4) is installed in the hole to be processed of part to be processed, on the coil brace (5) in coil (9),
Mold positioning ring (3) is installed on compressing component locating piece (4) in the central through hole of mould (2), is sequentially passed through using screw rod (6)
Mold positioning ring (3), part locating piece (4), coil brace (5), backing plate (7), it is fixed with nut (8) in screw rod (6) end；Will
Upper cover plate (1) is fixed on mould (2), compaction mold (2)；
Step 4: coil (9) is connected with magnetic field impulse equipment output end, equipment power supply, charging, electric discharge, at pre-manufactured hole are opened
Form circular cross-esction structure；
Step 5: dismounting upper cover plate (1), mould (2), coil (9) and part；
Step 6: polished with emery cloth and clear up piece surface, with the diameter dimension of the flanging bore generated in slide calliper rule detecting step four,
The thickness at magnetic field impulse projecting apertures position is checked with outside micrometer；If there is thinning or crackle in magnetic field impulse projecting apertures deformed area position,
Then reduce internal diameter, the outside diameter of coil (9), three~step 5 of repeat step, until the arc flange knot of the magnetic field impulse projecting apertures of generation
Structure does not occur thinning or crackle.
A kind of 2. method prevented the fracture of magnetic field impulse projecting apertures fillet and be thinned according to claim 1, it is characterised in that institute
State in step 2, prefabricated bore dia d0Calculation formula it is as follows：
d0=d1-2(H-0.43r-0.22δ)
In formula：d1For flanging bore internal diameter；R is circular cross-esction structure inner bend radius；δ is the blank thickness of parts to be processed；H is
Part height after flange.
3. a kind of method prevented the fracture of magnetic field impulse projecting apertures fillet and be thinned according to claim 1 or 2, its feature exist
In the coil (9) is made using the sectional area with insulating layer of 6~10 square millimeters of conducting wire or cable, in coil (9)
Footpath D1 is smaller 10mm~20mm than pre-manufactured hole D2, and coil (9) number of turn is 5~8 circles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711068819.1A CN107952860A (en) | 2017-11-03 | 2017-11-03 | It is a kind of to prevent the fracture of magnetic field impulse projecting apertures fillet and thinned method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711068819.1A CN107952860A (en) | 2017-11-03 | 2017-11-03 | It is a kind of to prevent the fracture of magnetic field impulse projecting apertures fillet and thinned method |
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| Publication Number | Publication Date |
|---|---|
| CN107952860A true CN107952860A (en) | 2018-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711068819.1A Pending CN107952860A (en) | 2017-11-03 | 2017-11-03 | It is a kind of to prevent the fracture of magnetic field impulse projecting apertures fillet and thinned method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109202257A (en) * | 2018-11-29 | 2019-01-15 | 哈工大机器人（岳阳）军民融合研究院 | Metal tube and metal plate Joining Technology and structure based on magnetic pulse welding techniques |
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| DE102007053361A1 (en) * | 2007-11-06 | 2009-05-07 | Volkswagen Ag | Method for shaping electromagnetic work pieces, involves use of flat coil to generate shaping force |
| CN105312380A (en) * | 2014-06-13 | 2016-02-10 | 首都航天机械公司 | Device and method for forming flange holes in large storage box |
| CN105583278A (en) * | 2014-10-23 | 2016-05-18 | 首都航天机械公司 | Method for forming horn-mouth-shaped flanged hole in top cap of carrier rocket storage tank |
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| CN109202257A (en) * | 2018-11-29 | 2019-01-15 | 哈工大机器人（岳阳）军民融合研究院 | Metal tube and metal plate Joining Technology and structure based on magnetic pulse welding techniques |
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Application publication date: 20180424 |
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