CN105642724A - Boss molding process for pipe - Google Patents
Boss molding process for pipe Download PDFInfo
- Publication number
- CN105642724A CN105642724A CN201610063347.XA CN201610063347A CN105642724A CN 105642724 A CN105642724 A CN 105642724A CN 201610063347 A CN201610063347 A CN 201610063347A CN 105642724 A CN105642724 A CN 105642724A
- Authority
- CN
- China
- Prior art keywords
- pipe fitting
- pipe
- die
- curved surface
- boss
- Prior art date
- 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
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/025—Stamping using rigid devices or tools for tubular articles
Abstract
The invention relates to a boss molding process for a pipe. The boss molding process for the pipe comprises the following steps that 1, a material is fetched, the pipe to be machined is put on a lower pipe clamping groove of a lower clamp firstly, and the to-be-machined end of the pipe is kept to extend out of a lower half female die of the lower clamp; 2, the pipe is clamped, then an upper clamp and the lower clamp are started to oppositely move for die assembly, the lower half female die and an upper half female die are spliced into a pipe type curve female die, an upper pipe clamping groove of the upper clamp and the lower pipe clamping groove of the lower clamp are spliced into a pipe type cavity and clamps the pipe tightly, and a pipe orifice of the to-be-machined end of the pipe is kept to be aligned at a positioning pin on a stamping die; 3, stamping is conducted, the stamping die is started, an annular stamping concave cavity between the positioning pin and a curve male die starts to stamp the outer wall of the pipe, and an arc-shaped annular boss is formed on the outer wall of the pipe under the extrusion effect of the pipe type curve female die and the curve male die; and 4, the pipe is taken out. Compared with an existing arc-shaped annular boss molding process, the boss molding process for the pipe is simple, low in production cost and high in production efficiency.
Description
Technical field
The present invention relates to the welding procedure of difference diameter pipes, particularly relate to the boss forming technique of a kind of pipe fitting.
Background technology
Air-conditioning, heat pump production process in, what refrigerant pipeline was the most frequently used is exactly purple pipe fitting, and connected mode between purple pipe fitting is multifarious especially, the big connected mode managed with tubule that one of which is relatively common, it is exactly hole on big tube wall, then being inserted in boring by tubule, heating is welded to connect. Because bore diameter is bigger than tube diameter, therefore the degree of depth that tubule inserts is difficult to unified, tubule inserts too deep, can stop the flow of big pipe, and slotting is too shallow, soldering opening is easily broken off again, so, in order to control the insertion depth of tubule, conventional way is to go out the punching press boss greater diameter than aperture at small pipe fitting near the mouth of pipe, the insertion depth of restriction small pipe fitting, it is to avoid small pipe fitting hinders the coolant flowing of big pipe. But, as shown in Figure 1 to Figure 2, boss general at present is all circular ring type, in approximately the same plane, when tubule inserts pipe welding, the area contacted between the bottom of boss with the tube wall of big pipe is only small, the intensity of welding is not enough, and not prison welding is leaned on, and the direction of tubule is also easy to deviation. Tubule is not enough with the weld strength of big pipe, is the main cause causing soldering opening to break, it is easy to the problem that there is secondary refrigerant leakage, the quality of machine is existed strong influence. Therefore, domestic refrigerant pipe produces product man and develops, for this problem, the pipe fitting that boss is curved, this arcuate annular boss both can control the insertion depth of pipe fitting, can guarantee that again and when two sealing of tube are firm and weld, be not easy displacement deformation, but the arcuate annular boss forming complex process of existing pipe fitting, processing time consuming is required great effort, and production cost is high and production efficiency is low.
Summary of the invention
It is an object of the invention to provide one and can process that arcuate annular boss, technique is simple and handling ease, production efficiency are high, the boss forming technique of the pipe fitting that production cost is low.
The object of the present invention is achieved like this:
The boss forming technique of a kind of pipe fitting, comprises the following steps:
Step one, blowing, be first positioned over pipe fitting to be processed on the lower clamp groove of lower clamp, and keeps the end to be processed of pipe fitting to stretch out the lower half die of lower clamp;
Step 2, material folding, then start upper and lower fixture and move towards matched moulds, lower half die and upper half die piece together a cast curved surface die, the upper and lower clamp groove of described upper and lower fixture pieces together tubular cavity and clamps pipe fitting, and keep pipe fitting end to be processed the mouth of pipe on alignment diel on alignment pin;
Step 3, punching press, then diel is started, alignment pin in diel is gradually inserted in pipe fitting by the end mouth of pipe to be processed of pipe fitting, annular punching press cavity between alignment pin and curved surface punch starts the outer wall of punching press pipe fitting, the outer wall of pipe fitting end to be processed start deformation and swollen outward, along with going deep into of diel, outer swollen pipe fitting outer wall, under the squeezing action of cast curved surface die and curved surface punch, forms arcuate annular boss recessed in the middle of, both sides protrusion;
Step 4, feeding, withdraw curved surface punch and open upper and lower fixture, then taking off pipe fitting after punching press.
The boss forming technique of pipe fitting of the present invention can also be improved further below.
Step 5 was also had before described step one, modeling, diameter according to pipe fitting to be processed and the setting diameter of arcuate annular boss, the upper and lower fixture that clamp groove diameter in selection, lower clamp groove diameter are matched, and select the curved surface punch that matches of diameter.
Concretely comprising the following steps of described step one: the setting diameter according to arcuate annular boss, keeps the end to be processed of pipe fitting to stretch out lower half die 5mm 8mm.
The clamping pressure of described upper and lower fixture is 900-1500N.
The clamping pressure of described diel is 12000-22000N.
The punching stroke of described diel is 50mm, and the drawing velocity of described diel is 50mm/s.
The length of described alignment pin is 10mm-15mm.
In step 2, the first end of described tubular cavity is open state, and the first end of tubular cavity connects with the bottom of cast curved surface die, and the second end of described tubular cavity is closed, before stamping, keeps the non-processing end of pipe fitting to be connected on the second end of tubular cavity.
The invention has the beneficial effects as follows:
(1) present invention is specific to the complex process existing for arcuate annular boss forming technique of existing pipe fitting, production cost is high, and the low inferior problem of production efficiency and the arcuate annular boss forming technique developed, the present invention compares existing arcuate annular boss forming technique, technique is simple, production cost is low, production efficiency is high, the present invention makes punching press boss out be arcuate annular, this arcuate annular boss both can control the insertion depth of pipe fitting, can guarantee that again and when two sealing of tube are firm and weld, be not easy displacement deformation, thus it is long and affect small pipe fitting 1 and hinder the flowing of the liquid in big pipe fitting 2 or gas to be prevented effectively from the part that small pipe fitting 1 inserts, during two pipe fittings welding simultaneously, owing to the radian of arcuate annular boss coincide with the tube wall radian of the big pipe fitting being inserted into, the tube wall of this arcuate annular boss and big pipe fitting fits tightly, so that two sealing of tube firmly and are not easy displacement deformation during welding.
(2) present invention can make purple pipe fitting mouth of pipe boss strike out arcuate annular, and the flexibility of arcuate annular boss can change by changing diel, to be suitable for the pipe fitting of different diameters, it is ensured that the laminating of small pipe fitting boss and big pipe fitting tube wall.
Accompanying drawing explanation
Fig. 1 is the structural representation of the positive stop lug boss on existing pipe fitting.
Fig. 2 is the attachment structure schematic diagram of existing pipe fitting and big pipe fitting.
Fig. 3,4 it is the flow chart of boss forming technique of pipe fitting of the present invention.
Fig. 5 is the structural representation of boss molding device.
Fig. 6 is the structural representation of the small pipe fitting after present invention process is processed.
Fig. 7 is the attachment structure schematic diagram of the small pipe fitting after present invention process is processed and big pipe fitting.
Fig. 8 is the structural representation of curved surface punch and alignment pin.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment one, as shown in Figures 3 to 8, a kind of boss molding device of pipe fitting, including upper fixture 3, lower clamp 4 and diel 5, described upper fixture 3 and lower clamp 4 are respectively equipped with clamp groove 32 and lower clamp groove 42, the end of described upper clamp groove 32 and lower clamp groove 42 is respectively equipped with upper half die 31 and lower half die 41, when upper fixture 3, after lower clamp 4 split, described upper clamp groove 32 and lower clamp groove 42 piece together a tubular cavity 6, described lower half die 41 and upper half die 31 piece together a cast curved surface die 7, the bottom of described cast curved surface die 7 connects with tubular cavity 6.
Described diel 5 respective tube die cavity 6 and cast curved surface die 7 are respectively equipped with alignment pin 52 and curved surface punch 51, described curved surface punch 51 is positioned at the periphery of alignment pin 52 rear end, described curved surface punch and alignment pin are coaxially disposed, and the diameter of curved surface punch is more than the diameter of alignment pin, an annular punching press cavity 53 it is provided with between described curved surface punch 51 and alignment pin 52, the width of described annular punching press cavity 53 is equal to the thickness of small pipe fitting 1 tube wall to be processed, described cast curved surface die 7 and the curved surface that curved surface punch 51 is two male-female engagement.
As present invention technical scheme more specifically.
Described curved surface punch 51 be middle protrude, both sides are recessed tubular, described cast curved surface punch is tubular that middle recessed, both sides are protruded.
The equal diameters of the diameter of described curved surface punch 51 and cast curved surface die 7.
As the more detailed technical scheme of the present invention.
The boss forming technique of the boss molding device processing pipe fitting of above-mentioned pipe fitting, comprises the following steps:
Step one, blowing, be first positioned over small pipe fitting 1 to be processed on the lower clamp groove 42 of lower clamp 4, and keeps the end to be processed of small pipe fitting 1 to stretch out the lower half die 41 of lower clamp 4;
Step 2, material folding, then start upper and lower fixture 4 and move towards matched moulds, lower half die 41 and upper half die 31 piece together a cast curved surface die 7, the upper and lower clamp groove 42 of described upper and lower fixture 4 clamps small pipe fitting 1, and keep small pipe fitting 1 end to be processed the mouth of pipe on alignment pin 52 in alignment diel 5;
Step 3, punching press, then diel 5 is started, alignment pin 52 in diel 5 is gradually inserted in small pipe fitting 1 by the end mouth of pipe to be processed of small pipe fitting 1, curved surface punch 51 on alignment pin 52 starts the outer wall of punching press small pipe fitting 1, the outer wall of small pipe fitting 1, under the squeezing action of cast curved surface die 7 and curved surface punch 51, forms arcuate annular boss 11 recessed in the middle of, both sides protrusion;
Step 4, feeding, withdraw curved surface punch 51 and open upper and lower fixture 4, then taking off small pipe fitting 1 after punching press.
The boss forming technique technical scheme more specifically of pipe fitting of the present invention.
Step 5 was also had before described step one, modeling, workman can according to the setting diameter of the diameter of small pipe fitting 1 to be processed and arcuate annular boss 11, the upper and lower fixture 4 that clamp groove diameter in selection, lower clamp groove diameter are matched, and select the curved surface punch 51 that matches of diameter to use.
Concretely comprising the following steps of described step one: the setting diameter according to arcuate annular boss 11, keeps the end to be processed of small pipe fitting 1 to stretch out lower half die 415mm 8mm.
The clamping pressure of described upper and lower fixture 4 is 900-1500N.
The clamping pressure of described diel 5 is 12000-22000N.
The punching stroke of described diel 5 is 50mm, and the drawing velocity of described diel 5 is 50mm/s.
The length of described alignment pin 52 is 10mm-15mm.
In step 2, first end of described tubular cavity 6 is open state, and the first end of tubular cavity 6 connects with the bottom of cast curved surface die 7, and the second end of described tubular cavity 6 is closed, before stamping, the non-processing end of small pipe fitting 1 is kept to be connected on the second end of tubular cavity 6.
Having an arcuate annular boss 11 on the outer wall of small pipe fitting 1 mouth of pipe processed through the present invention, this arcuate annular boss 11 is in middle recessed, both sides convex shape. The radian of this arcuate annular boss 11 is identical with the tube wall radian of the big pipe fitting 2 being inserted into. When two pipe fittings connects, the tube wall of arcuate annular boss 11 and big pipe fitting 2 fits tightly, this arcuate annular boss is big with the contact area of big pipe fitting 2 tube wall, so that two sealing of tube firmly and are not easy displacement deformation during welding, and insertion big pipe fitting 2 degree of depth that this arcuate annular boss can control pipe fitting, thus avoid part that small pipe fitting 1 inserts long and affect small pipe fitting 1 and hinder the flowing of the liquid in big pipe fitting 2 or gas.
The present invention is suitable for the punch forming of the arcuate annular boss of the pipe fittings such as copper tube, aluminum pipe, stainless steel tube.
Claims (8)
1. the boss forming technique of a pipe fitting, it is characterised in that: comprise the following steps:
Step one, blowing, be first positioned over pipe fitting to be processed on the lower clamp groove of lower clamp, and keeps the end to be processed of pipe fitting to stretch out the lower half die of lower clamp;
Step 2, material folding, then start upper and lower fixture and move towards matched moulds, lower half die and upper half die piece together a cast curved surface die, the upper and lower clamp groove of described upper and lower fixture pieces together tubular cavity and clamps pipe fitting, and keep pipe fitting end to be processed the mouth of pipe on alignment diel on alignment pin;
Step 3, punching press, then diel is started, alignment pin in diel is gradually inserted in pipe fitting by the end mouth of pipe to be processed of pipe fitting, annular punching press cavity between alignment pin and curved surface punch starts the outer wall of punching press pipe fitting, the outer wall of pipe fitting end to be processed start deformation and swollen outward, along with going deep into of diel, outer swollen pipe fitting outer wall, under the squeezing action of cast curved surface die and curved surface punch, forms an arcuate annular boss;
Step 4, feeding, withdraw curved surface punch and open upper and lower fixture, then taking off pipe fitting after punching press.
2. the boss forming technique of pipe fitting according to claim 1, it is characterized in that: before described step one, also have step 5, modeling, diameter according to pipe fitting to be processed and the setting diameter of arcuate annular boss, the upper and lower fixture that clamp groove diameter in selection, lower clamp groove diameter are matched, and select the curved surface punch that matches of diameter.
3. the boss forming technique of pipe fitting according to claim 1, it is characterised in that: in step one: the setting diameter according to arcuate annular boss, keep the end to be processed of pipe fitting to stretch out lower half die 5mm 8mm.
4. the boss forming technique of pipe fitting according to claim 1, it is characterised in that: the clamping pressure of described upper and lower fixture is 900-1500N.
5. the boss forming technique of pipe fitting according to claim 1, it is characterised in that: the clamping pressure of described diel is 12000-22000N.
6. the boss forming technique of pipe fitting according to claim 1, it is characterised in that: the punching stroke of described diel is 50mm, and the drawing velocity of described diel is 50mm/s.
7. the boss forming technique of pipe fitting according to claim 1, it is characterised in that: the length of described alignment pin is 10mm-15mm.
8. the boss forming technique of pipe fitting according to claim 1, it is characterized in that: in step 2, first end of described tubular cavity is open state, first end of tubular cavity connects with the bottom of cast curved surface die, second end of described tubular cavity is closed, before stamping, the non-processing end of pipe fitting is kept to be connected on the second end of tubular cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610063347.XA CN105642724A (en) | 2016-01-31 | 2016-01-31 | Boss molding process for pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610063347.XA CN105642724A (en) | 2016-01-31 | 2016-01-31 | Boss molding process for pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105642724A true CN105642724A (en) | 2016-06-08 |
Family
ID=56488934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610063347.XA Pending CN105642724A (en) | 2016-01-31 | 2016-01-31 | Boss molding process for pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105642724A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107052117A (en) * | 2017-04-14 | 2017-08-18 | 刘得胜 | A kind of forming method of special section tubular product |
| CN108435913A (en) * | 2018-03-21 | 2018-08-24 | 河海大学文天学院 | Car seat torque tube squeezes a convex mould and has more cold extrusion die |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07324887A (en) * | 1994-05-31 | 1995-12-12 | Tsuchiya Mfg Co Ltd | Multi-tubular type heat exchanger core and its manufacture |
| CN2778423Y (en) * | 2005-03-02 | 2006-05-10 | 刘宗信 | Metal pipe surface forming device |
| CN201720323U (en) * | 2010-05-04 | 2011-01-26 | 浙江爽凯汽车空调有限公司 | Compound bulging mould of pipe fittings of automobile air conditioner |
| CN102607321A (en) * | 2012-03-21 | 2012-07-25 | 宁波久源润滑设备制造有限公司 | Heat exchanger and manufacture method thereof |
| CN103624124A (en) * | 2012-08-20 | 2014-03-12 | 俞越 | Pipe orifice edge turning die |
| CN203494970U (en) * | 2014-01-09 | 2014-03-26 | 上海莲南汽车附件有限公司 | Structure of dual-boss pipe end molding and clamping die |
-
2016
- 2016-01-31 CN CN201610063347.XA patent/CN105642724A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07324887A (en) * | 1994-05-31 | 1995-12-12 | Tsuchiya Mfg Co Ltd | Multi-tubular type heat exchanger core and its manufacture |
| CN2778423Y (en) * | 2005-03-02 | 2006-05-10 | 刘宗信 | Metal pipe surface forming device |
| CN201720323U (en) * | 2010-05-04 | 2011-01-26 | 浙江爽凯汽车空调有限公司 | Compound bulging mould of pipe fittings of automobile air conditioner |
| CN102607321A (en) * | 2012-03-21 | 2012-07-25 | 宁波久源润滑设备制造有限公司 | Heat exchanger and manufacture method thereof |
| CN103624124A (en) * | 2012-08-20 | 2014-03-12 | 俞越 | Pipe orifice edge turning die |
| CN203494970U (en) * | 2014-01-09 | 2014-03-26 | 上海莲南汽车附件有限公司 | Structure of dual-boss pipe end molding and clamping die |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107052117A (en) * | 2017-04-14 | 2017-08-18 | 刘得胜 | A kind of forming method of special section tubular product |
| CN108435913A (en) * | 2018-03-21 | 2018-08-24 | 河海大学文天学院 | Car seat torque tube squeezes a convex mould and has more cold extrusion die |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20160608 |