CN102941342A - Method for pressing self-brazing agent aluminum welding ring and special cold-pressing die and sintering die thereof - Google Patents
Method for pressing self-brazing agent aluminum welding ring and special cold-pressing die and sintering die thereof Download PDFInfo
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- CN102941342A CN102941342A CN2012105112894A CN201210511289A CN102941342A CN 102941342 A CN102941342 A CN 102941342A CN 2012105112894 A CN2012105112894 A CN 2012105112894A CN 201210511289 A CN201210511289 A CN 201210511289A CN 102941342 A CN102941342 A CN 102941342A
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Abstract
The invention discloses a method for pressing a self-brazing agent aluminum welding ring. The method comprises a cold-pressing working procedure and a sintering working procedure. The cold-pressing working procedure comprises the following steps of: selecting a cold-pressing die meeting a size requirement according to the specification of the aluminum welding ring, putting a uniformly mixed brazing material and brazing agent mixture into a cavity of the cold-pressing die according to a proportion by virtue of a powder accommodating shoe, and pressing the mixture at room temperature to obtain a blank for standby use. The sintering working procedure comprises the following steps of: putting the cold-pressing formed blank into a sintering die, and quickly sintering the blank under certain pressure in a nitrogen or vacuum environment to obtain an aluminum welding ring finished product. The invention also discloses the cold-pressing die and the sintering die which are specially used in the pressing method. The method provided by the invention has the advantages that the problem that a self-brazing material has low activity and low use efficiency is solved; the working procedures such as cutting, wire drawing and ring making are omitted; the production cost is reduced; the production efficiency is improved; the dies are simple in structure; a plurality of aluminum welding rings can be sintered at one time; the production efficiency and the flexibility are improved; and the aluminum welding ring can be machined conveniently and quickly.
Description
Technical field
The present invention relates to from the brazing flux almit, especially relate to a kind of drawing method from brazing flux aluminium weld-ring, the invention still further relates to cold stamping die and sintering mold special-purpose in this drawing method.
Background technology
In recent years, along with at aspects such as Aeronautics and Astronautics, communication, traffic, daily necessitiess with aluminium for copper, with the development of aluminium for the steel technology, people also will come higher to the requirement of aluminium alloy interconnection technique.And aluminium alloy tradition soldering processes (scolder and solder flux are fed to respectively binding site) exist the brazing operation trouble, the solder flux use amount is difficult to the problems such as homogenising, and excessive use solder flux also can cause brazing product and brazing operation contaminated environment, particularly seems particularly outstanding in some these problems of occasion that need special-shaped solder (such as the ring-type solder) and postwelding to be difficult to clear up.
Advantage from the brazing flux almit is that postwelding need not clean, and has avoided the corrosion of postwelding residue to aluminum pipe.Because easy to use, relative low price has effectively been alleviated an above-mentioned difficult problem to a certain extent from the fast development of brazing flux almit.But prior art adopt without the heat pressing process meeting of any protection so that the brazing flux in the self fluxing brazing alloy react; greatly reduce activity; and the processing of special-shaped solder (such as the ring-type solder) also needs the multiple working procedures such as wire drawing, cutting, ring processed, so that the solder investment of production equipment is large, production efficiency is low, production cost is high, the production cycle is long.
Summary of the invention
The object of the present invention is to provide the drawing method from brazing flux aluminium weld-ring that a kind of production efficiency is high, production cost is low and flux activity is high, the present invention also provides cold stamping die and sintering mold special-purpose in a kind of this drawing method.
For achieving the above object, the present invention can take following technical proposals:
Drawing method from brazing flux aluminium weld-ring of the present invention, comprise cold pressing process and sintering circuit, described cold pressing process is: the cold stamping die of selecting to meet dimensional requirement according to the specification of aluminium weld-ring, the solder that mixes in proportion+brazing flux mixture is packed in the cold stamping die die cavity by feed shoe, be pressed into blank under the room temperature for subsequent use; Described sintering circuit is: the blank of cold moudling is packed in the sintering mold, and 410～520 ℃ of sintering 20～90s can obtain aluminium weld-ring finished product in certain pressure and nitrogen or vacuum environment.
Special-purpose cold stamping die in the drawing method of the present invention, it comprises die, described die is fixed on the top clamping plate of below by cushion block, is arranged on the annular die cavity of formation between the T-shaped core in longitudinal section in the described matrix cavity and the described die inwall; Equilibrium is fixed between the guide pillar on the described die and has been horizontally disposed with dynamic mould fixing plate, and the below of the dynamic mould fixing plate that slides up and down along described guide pillar is provided with the punch that is complementary with described core; The axle center of described punch, core and die coincides;
For increasing work efficiency, the bottom of described annular die cavity is provided with throw-out collar, is placed on that vertical symmetry is provided with push rod on the movable panel on the described top clamping plate, and described push rod extends to the bottom of described throw-out collar.
For the axle center that guarantees core and die coincides, between the faying face of described core and die, be provided with alignment pin.
The sintering mold of special use in the drawing method of the present invention, it comprises the SiC earthenware that internal diameter and aluminium weld-ring adapt, slide successively from bottom to top in described SiC earthenware and stacked the inverted T-shaped casting pig, sliding at the topmost of described T shape casting pig is provided with the disc briquetting.
The invention has the advantages that self-drill brazing filler poor activity, the problem that service efficiency is low of having solved, the operations such as cutting, wire drawing, ring processed have been omitted, reduced production cost, improved production efficiency, cold pressing, twice pressurization in the sintering circuit so that the density of finished product aluminium weld-ring greatly increase.Mould structure in cold pressing process and the sintering circuit is simple, but a plurality of aluminium weld-rings of sintering once, no matter improved production efficiency and flexibility, be many specifications aluminium weld-ring that the required unified specification aluminium weld-ring of suitability for industrialized production or experimental study are used, and processing all easily, fast.
Description of drawings
Fig. 1 is the structural representation of cold stamping die of the present invention.
Fig. 2 is the structural representation of sintering mold of the present invention.
The specific embodiment
Drawing method from brazing flux aluminium weld-ring of the present invention, it comprises cold pressing process and sintering circuit, cold pressing process is: the cold stamping die of selecting to meet dimensional requirement according to the specification of aluminium weld-ring, with mix in proportion solder and brazing flux mixture (being generally the brazing flux of 80～95% solders+5～20%) pack in the cold stamping die die cavity by feed shoe, it is for subsequent use that 100～280kN is pressed into closely knit circular material blank under the room temperature; Sintering circuit is: the blank of in advance cold moudling is packed in the sintering mold, and in 50～190kN pressure and nitrogen or vacuum environment, 410～520 ℃ of sintering can obtain aluminium weld-ring finished product in 20～90 seconds.
As shown in Figure 1, the cold stamping die of special use in the drawing method of the present invention, comprise die 1, die 1 is fixed on the top clamping plate 3 of below by cushion block 2, be arranged between the T-shaped core 4 in longitudinal section in the matrix cavity and die 1 inwall and form annular die cavity 5, for guaranteeing that core 4 and the axle center of die 1 coincide, and are provided with alignment pin 12 between the faying face of core 4 and die 1; Equilibrium is fixed between the guide pillar 6 on the die 1 and has been horizontally disposed with dynamic mould fixing plate 7, and the below of the dynamic mould fixing plate 7 that slides up and down along guide pillar 6 is provided with the punch 8 that is complementary with core 4; The axle center of punch 8, core 4 and die 1 coincides; For convenient compressing circular material blank takes out from die cavity, be provided with throw-out collar 9 in the bottom of annular die cavity 5, be placed on that vertical symmetry is provided with push rod 11 on the movable panel 10 on the top clamping plate 3, push rod 11 extends to the bottom of throw-out collar 9.During work, by feed shoe the mixed powder of solder and brazing flux is packed in the annular die cavity 5, forcing press drives punch 8 reciprocating motions that are fixed on the dynamic mould fixing plate 7 and finishes pressing process one time, can repeat above-mentioned pressing process when larger such as the thickness of required aluminium weld-ring, until obtain till the aluminium weld-ring of desired thickness, then make progress by press ejection cylinder drive movable panel 10 and push rod 11, promote throw-out collar 9 the aluminium weld-ring blank that suppresses is ejected from annular die cavity 5.
As shown in Figure 2, special-purpose sintering mold in the drawing method of the present invention, comprise the SiC earthenware 13 that internal diameter and aluminium weld-ring adapt, sliding successively from bottom to top in SiC earthenware 13 has stacked inverted T-shaped casting pig 14, and sliding at the topmost of T shape casting pig 14 is provided with disc briquetting 15.During sintering, to be mounted on through the circular material blank 16 that cold pressing process obtains on the step of T shape casting pig 14, the thickness of circular material blank 16 will be higher than about the boss 1mm of T shape casting pig 14, put disc briquetting 15 topmost, and give the pressure of 50～190kN, place nitrogen or vacuum environment, Fast Heating sintering 20-90s, then the aluminium weld-ring that sinters is released SiC earthenware 13, can obtain required active high from brazing flux aluminium weld-ring.
The below lifts several examples implementation step of the present invention is described:
1, compacting Φ 13 * Φ, 18 * 5mm Al88Si aluminium weld-ring (brazing flux ratio 10%)
Al88Si and Nocolok brazing flux are pressed into the thick circular material blank of 5.8mm by cold stamping die after mixing in ball mill in the ratio of 9:1.Repeat aforesaid operations until obtain the circular material blank of requirement; A plurality of circular material blanks are put into sintering mold successively, and vacuum-sintering 50s under 480 ℃ of temperature obtains required aluminium weld-ring.The boss height of the T shape casting pig 14 of sintering mold should be 5mm at this moment.
2, compacting Φ 13 * Φ, 18 * 5mm Al88Si aluminium weld-ring (brazing flux ratio 13%)
Al88Si and Nocolok brazing flux are pressed into the thick circular material blank of 5.8mm by cold stamping die after mixing in ball mill in the ratio of 87:13.Repeat aforesaid operations until obtain the circular material blank of requirement; A plurality of circular material blanks are put into sintering mold successively, and vacuum-sintering 45s under 480 ℃ of temperature obtains required aluminium weld-ring.The height of the boss of the T shape casting pig 14 of sintering mold should be 5mm at this moment.
3, compacting Φ 13 * Φ, 18 * 5mm Al72Si8Cu aluminium weld-ring (brazing flux ratio 10%)
Al72Si8Cu and Nocolok brazing flux are pressed into the thick circular material blank of 5.8mm by cold stamping die after mixing in ball mill in the ratio of 9:1.Repeat aforesaid operations until obtain the circular material blank of requirement; A plurality of circular material blanks are put into sintering mold successively, and vacuum-sintering 40s under 460 ℃ of temperature obtains required aluminium weld-ring.The height of the boss of the T shape casting pig 14 of sintering mold should be 5mm at this moment.
4, compacting Φ 13 * Φ, 18 * 5mm Al68Si5Cu aluminium weld-ring (brazing flux ratio 10%)
Al68Si5Cu and Nocolok brazing flux are pressed into the thick circular material blank of 5.8mm by cold stamping die after mixing in ball mill in the ratio of 9:1.Repeat aforesaid operations until obtain the circular material blank of requirement, a plurality of circular material blanks are put into sintering mold successively, vacuum-sintering 30s under 450 ℃ of temperature obtains required aluminium weld-ring.The height of the boss of the T shape casting pig 14 of sintering mold should be 5mm at this moment.
5, compacting Φ 10 * Φ, 13 * 3mm Al88Si aluminium weld-ring (brazing flux ratio 15%)
Al88Si and Nocolok brazing flux are pressed into the thick circular material blank of 3.5mm by cold stamping die after mixing in ball mill in the ratio of 85:15.Repeat aforesaid operations until obtain the circular material blank of requirement, a plurality of circular material blanks are put into sintering mold successively, vacuum-sintering 20s under 480 ℃ of temperature obtains required aluminium weld-ring.The height of the boss of the T shape casting pig 14 of sintering mold should be 3mm at this moment.
6, compacting Φ 10 * Φ, 13 * 3mm Al66Cu28Si aluminium weld-ring (brazing flux ratio 12%)
Al66Cu28Si and Nocolok brazing flux are pressed into the thick circular material blank of 3.5mm by cold stamping die after mixing in ball mill in the ratio of 88:12.Repeat aforesaid operations until obtain the circular material blank of requirement, a plurality of circular material blanks are put into sintering mold successively, vacuum-sintering 20s under 410 ℃ of temperature obtains required aluminium weld-ring.The height of the boss of the T shape casting pig 14 of sintering mold should be 3mm at this moment.
7, compacting Φ 13 * Φ, 18 * 8mm Al88Si aluminium weld-ring (brazing flux ratio 8%)
Al88Si and Nocolok brazing flux are pressed into the thick circular material blank of 8.8mm by cold stamping die after mixing in ball mill in the ratio of 92:8.Repeat aforesaid operations until obtain the circular material blank of requirement; A plurality of circular material blanks are put into sintering mold successively, and vacuum-sintering 90s under 520 ℃ of temperature obtains required aluminium weld-ring.The boss height of the T shape casting pig 14 of sintering mold should be 8mm at this moment.
Claims (5)
1. drawing method from brazing flux aluminium weld-ring, it is characterized in that: it comprises cold pressing process and sintering circuit, described cold pressing process is: the cold stamping die of selecting to meet dimensional requirement according to the specification of aluminium weld-ring, the solder that mixes in proportion+brazing flux mixture is packed in the cold stamping die die cavity by feed shoe, be pressed into blank under the room temperature for subsequent use; Described sintering circuit is: the blank of cold moudling is packed in the sintering mold, and 410～520 ℃ of sintering can obtain aluminium weld-ring finished product in 20～90 seconds in certain pressure and nitrogen or vacuum environment.
2. special-purpose cold stamping die in the drawing method as claimed in claim 1, it is characterized in that: it comprises die (1), described die (1) is fixed on the top clamping plate (3) of below by cushion block (2), is arranged on formation annular die cavity (5) between the T-shaped core (4) in longitudinal section in the described matrix cavity and described die (1) inwall; Equilibrium is fixed between the guide pillar (6) on the described die (1) and has been horizontally disposed with dynamic mould fixing plate (7), and the below of the dynamic mould fixing plate (7) that slides up and down along described guide pillar (6) is provided with the punch (8) that is complementary with described core (4); The axle center of described punch (8), core (4) and die (1) coincides.
3. cold stamping die according to claim 2, it is characterized in that: the bottom of described annular die cavity (5) is provided with throw-out collar (9), the upper vertical symmetry of movable panel (10) that is placed on the described top clamping plate (3) is provided with push rod (11), and described push rod (11) extends to the bottom of described throw-out collar (9).
4. it is characterized in that: between the faying face of described core (4) and die (1), be provided with alignment pin (12) according to claim 2 or 3 described cold stamping dies.
5. special-purpose sintering mold in the drawing method as claimed in claim 1, it is characterized in that: it comprises the SiC earthenware (13) that internal diameter and aluminium weld-ring adapt, slide successively from bottom to top in described SiC earthenware (13) and stacked inverted T-shaped casting pig (14), sliding at the topmost of described T shape casting pig (14) is provided with disc briquetting (15).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105112894A CN102941342A (en) | 2012-12-04 | 2012-12-04 | Method for pressing self-brazing agent aluminum welding ring and special cold-pressing die and sintering die thereof |
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| CN2012105112894A CN102941342A (en) | 2012-12-04 | 2012-12-04 | Method for pressing self-brazing agent aluminum welding ring and special cold-pressing die and sintering die thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104874800A (en) * | 2015-05-27 | 2015-09-02 | 优美科科技材料（苏州）有限公司 | Manufacturing method for pressing powder into welded ring |
| CN110102759A (en) * | 2019-05-28 | 2019-08-09 | 武汉理工大学 | A kind of preparation method of electromagnetism compacting core-shell structure solder weld tabs |
| CN111072392A (en) * | 2019-11-25 | 2020-04-28 | 宁波江丰粉末冶金有限公司 | Production method of annular ceramic product |
| CN113634748A (en) * | 2021-08-31 | 2021-11-12 | 三河市精明粉末冶金科技有限公司 | Preparation method of micro-deformation thin-wall porous material |
| CN118321545A (en) * | 2024-06-14 | 2024-07-12 | 成都虹波实业股份有限公司 | Tungsten alloy circular ring forming die and manufacturing method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104874800A (en) * | 2015-05-27 | 2015-09-02 | 优美科科技材料（苏州）有限公司 | Manufacturing method for pressing powder into welded ring |
| CN110102759A (en) * | 2019-05-28 | 2019-08-09 | 武汉理工大学 | A kind of preparation method of electromagnetism compacting core-shell structure solder weld tabs |
| CN111072392A (en) * | 2019-11-25 | 2020-04-28 | 宁波江丰粉末冶金有限公司 | Production method of annular ceramic product |
| CN111072392B (en) * | 2019-11-25 | 2022-07-29 | 宁波江丰热等静压技术有限公司 | Production method of annular ceramic product |
| CN113634748A (en) * | 2021-08-31 | 2021-11-12 | 三河市精明粉末冶金科技有限公司 | Preparation method of micro-deformation thin-wall porous material |
| CN118321545A (en) * | 2024-06-14 | 2024-07-12 | 成都虹波实业股份有限公司 | Tungsten alloy circular ring forming die and manufacturing method |
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Application publication date: 20130227 |