CN101658914A - Surface forging maintenance process of mold for the production of graphite cast iron pipe by centrifugal method - Google Patents
Surface forging maintenance process of mold for the production of graphite cast iron pipe by centrifugal method Download PDFInfo
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- CN101658914A CN101658914A CN200910145031A CN200910145031A CN101658914A CN 101658914 A CN101658914 A CN 101658914A CN 200910145031 A CN200910145031 A CN 200910145031A CN 200910145031 A CN200910145031 A CN 200910145031A CN 101658914 A CN101658914 A CN 101658914A
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Abstract
The invention discloses a surface forging maintenance process of a mold for the production of graphite cast iron pipes by a centrifugal method, comprising the steps of firstly conducting low-temperature aging treatment to a cast pipe mold (1), and then conducting surface forging treatment under hot condition to a work surface and implementing surface grinding, and finally conducting cold-state forging. By adopting the technical scheme, repeated experiences show that no mold is cracked. The mold which is treated by adopting the way delays the emergence of craquelure after low-temperature aging,and by adopting the technical scheme, the service life of the mold is greatly prolonged.
Description
Technical field
The invention belongs to the technical field of metallurgical industry production technology, relate to the technology of centrifugal process ductile iron pipe production technology equipment, more particularly, the present invention relates to the surface forging maintenance process of a kind of centrifugal process ductile iron pipe production with mould.
Background technology
Mould is to produce one of the spun cast pipe process conditions very part and parcel, not only is related to product quality, and is related to a key factor of production cost.
In water-cooled centrifuge production process, the qualified molten iron of spheroidising directly is poured into mould inner wall by chute, the mould outer wall for flow, temperature is 40～75 ℃ cooling water, make mould have higher intensity of cooling, molten iron is 1200～1260 ℃ by the temperature that chute directly is poured into mould inner wall.Molten iron is with after mould inner wall contacts, and mould inner wall temperature 100～250 ℃ before by cast are increased to 650～700 ℃ rapidly.In the process of coagulation forming, the heat of molten iron is taken away by cooling water rapidly by the mould conduction, and the mould inner wall temperature is reduction trend, and outer wall is because of the effect of cooling water, and temperature has rising slightly, but maintains substantially below 100 ℃.After cast tube is extracted, the temperature steep drop to 100 of inwall～250 ℃.The periodic variation taking place in the temperature of mould inner wall in whole process of production.
Centrifuge is in producing continuously, and the rapid variation of inner wall temperature makes mould produce alternating thermal stress between the each cast of mould.The interior wall tissue reciprocal effect of growing up, compress, stretch will produce be full of cracks after stress accumulation surpasses the strength of materials limit.Stress accumulation surpasses the direct grinding of mould, working face that centrifuge to a certain degree returns after using and forges and will cause the mould explosion.
This process that colds and heat succeed each other changes the mould internal stress, causes mould to sustain damage, and has a strong impact on die life.The more method for maintaining of present domestic use is to carry out surface forging, eliminates stress, and integrates the crack.
Summary of the invention
Problem to be solved by this invention provides a kind of centrifugal process ductile iron pipe production surface forging maintenance process with mould, its objective is the generation that postpones the working face segmentation crack, avoids forging at working face that mould splits cruelly in the process, improves the service life of mould.
To achieve these goals, the technical scheme taked of the present invention is:
The centrifugal process ductile iron pipe production that provides of invention is at first carried out low temperature aging to the cast tube mould and is handled with the surface forging maintenance process of mould, again working face is carried out hot surface forging processing down, carries out surfacing then, carries out cold conditions at last and forges.
The method that described low temperature aging is handled is: the cast tube mould after will using is placed on and can makes on its rotation tugboat group of at the uniform velocity rotating, and the cast tube mould is evenly heated; Heating-up temperature remains between 150～250 ℃, and temperature retention time is more than 10 hours.
When the cast tube mould after described low temperature aging is handled insulation slowly cools to 150 ℃, bring into use working face to forge equipment, hot use down forge hammer to cast tube mould important process face carry out repeatedly, forge processing uniformly, in this process, the surface temperature of cast tube mould that keeps forging processing is more than 80 ℃.
The described hammer that forges that forges processing, the ball-type carbide alloy tup of use diameter 1～8mm;
The amplitude of forging is that working face is forged working face to forge cup depth be 0.1～2mm;
Forging is taken taxi and is forged density and forged the distance that working face two forges between the depression to be not more than 2 times of indenture diameters.
The process of the surface forging under hot in the described forging maintenance process is:
1), the rotation tugboat group of utilizing drives the rotation of cast tube mould;
2), the coal gas water back that picks out two 20mm diameters from gas piping puts in that the some coal gas heats the cast tube mould in the mould bell and spigot;
3), adjust rotation tugboat group rotating speed at 0.5 rev/min;
4), adjust the coal gas size, temperature is controlled between 150～250 ℃, keep cast tube mold temperature substantially constant.
5), must keep more than 10 hours heat time heating time.
6), heating mould is after 10 hours, close gas valve and cut off gas supply, when making the cast tube mould on rotation tugboat group, slowly cool to 150 ℃ of left and right sides, transport to working face and forge on the equipment, hot use down forge hammer to bell and spigot from port one rice with interior surface carry out repeatedly, working face forges uniformly.
The present invention adopts technique scheme, shows by repetition test: do not have a mould explosion.Adopt mould that aforesaid way handles through having postponed the appearance of segmentation crack behind the low temperature aging, as: originally built 700 the time bell and spigot crackle have 2～3mm wide; After adopting technology of the present invention, the crackle of bell and spigot has 2～3mm wide in 1000 of casting.Original DN800 die casting number life-span casts more than 3500 now at 2500, and some die casting number reaches 4000.Original DN1000 die casting number life-span is cast 2000 now at 1500, and some die casting number reaches 2500.In sum, adopt technical scheme of the present invention that the life-span of mould is greatly prolonged.
Description of drawings
Below expressed content of each width of cloth accompanying drawing of this specification and the mark among the figure are briefly explained:
Fig. 1 is a process chart of the present invention;
Fig. 2 is a process equipment structural representation of the present invention.
Be labeled as among the figure:
1, cast tube mould, 2, rotation tugboat group, 3, workbench, 4, motor, 5, the coal gas heating tube.
The specific embodiment
Contrast accompanying drawing below, by description to embodiment, to effect and operation principle, the manufacturing process of the mutual alignment between the shape of the specific embodiment of the present invention such as related each member, structure, the each several part and annexation, each several part and manipulate method etc., be described in further detail, inventive concept of the present invention, technical scheme had more complete, accurate and deep understanding to help those skilled in the art.
In this specification and the accompanying drawing, " getting ready " speech is equal to " forging ".In addition, mould promptly refers to cast tube mould 1.
As Fig. 1 process chart provided by the invention, the expressed structure of the present invention of Fig. 2, the present invention is the surface forging maintenance process of a kind of centrifugal process ductile iron pipe production with mould.Its technical process is:
As shown in Figure 1, centrifugal process ductile iron pipe production provided by the present invention is at first carried out low temperature aging to cast tube mould 1 and is handled with the surface forging maintenance process of mould, again working face is carried out hot surface forging processing down, carry out surfacing then, carry out cold conditions at last and forge.
Eliminate the indelible residual thermal stress of surface forging technology, postpone the generation of working face segmentation crack, avoid forging that mould splits cruelly in the process, raising service life at working face.
Below be concrete exemplifying embodiment of the present invention:
The method that low temperature aging of the present invention is handled is: the cast tube mould 1 after will using is placed on and can makes on its rotation tugboat group 2 of at the uniform velocity rotating, and cast tube mould 1 is evenly heated; Heating-up temperature remains between 150～250 ℃, and temperature retention time is more than 10 hours.
Forge explosion for solving working face, postpone the segmentation crack generation, use the back mould to be placed on the support roller group that at the uniform velocity to rotate to centrifuge the mould bell and spigot is heated.Heating-up temperature remains between 150～250 ℃, and temperature retention time is more than 10 hours.
When the cast tube mould 1 after described low temperature aging is handled insulation slowly cools to 150 ℃, bring into use working face to forge equipment, hot use down forge hammer to cast tube mould 1 important process face carry out repeatedly, forge processing uniformly, in this process, the surface temperature of cast tube mould 1 that keeps forging processing is more than 80 ℃.
When the mould after the insulation slowly cooled to 150 ℃ of left and right sides on support roller, handling forged on the equipment to working face, and the hot following working face that the working surface of needs elimination residual thermal stress is carried out repeatedly forges.When the cast tube mould 1 after the insulation slowly cools to 150 ℃ of left and right sides on support roller, carry out hot vibration behind cast tube mould 1 low temperature aging immediately and get ready.Handling is to getting ready on the equipment, hotly down 1 meter of bell and spigot carried out 2～4 times and gets technology ready with interior.
The described hammer that forges that forges processing, the ball-type carbide alloy tup of use diameter 1～8mm.
The carbide alloy tup has good hardness and intensity, and its spherical tup makes the smooth surface of beating out, the elimination micro-crack that internal stress produced.
The amplitude of forging is that working face is forged working face to forge cup depth be 0.1～2mm.
The depression of the sphere that produces by working face makes its working surface produce strong plastic deformation, has improved the surface peening effect.
Forging is taken taxi and is forged density and forged the distance that working face two forges between the depression to be not more than 2 times of indenture diameters.
The requirement of above-mentioned density has guaranteed the effect of surface peening.
The process of the surface forging under hot in the forging maintenance process of the present invention is:
1) the rotation tugboat group of, utilizing 2 drives 1 rotation of cast tube mould;
2), the coal gas water back 5 that picks out two 20mm diameters from gas piping puts in that the some coal gas heats cast tube mould 1 in the mould bell and spigot;
3), adjust rotation tugboat group 2 rotating speeds at 0.5 rev/min;
4), adjust the coal gas size, temperature is controlled between 150～250 ℃, keep cast tube mould 1 temperature substantially constant.
5), must keep more than 10 hours heat time heating time.
6), heating mould is after 10 hours, close gas valve and cut off gas supply, when making cast tube mould 1 on rotation tugboat group 2, slowly cool to 150 ℃ of left and right sides, transport to working face and forge on the equipment, hot use down forge hammer to bell and spigot from port one rice with interior surface carry out repeatedly, working face forges uniformly.
Described rotation tugboat group 2 is located on the workbench 3, and is driven by motor 4.
In conjunction with the accompanying drawings the present invention has been carried out exemplary description above; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or design of the present invention and technical scheme are directly applied to other occasion without improving, all within protection scope of the present invention.
Claims (5)
1, a kind of centrifugal process ductile iron pipe production surface forging maintenance process of mould, it is characterized in that: at first cast tube mould (1) is carried out low temperature aging and handle, the surface forging that working face is carried out under hot is handled again, carries out surfacing then, carries out cold conditions at last and forges.
2, according to the surface forging maintenance process of the described centrifugal process ductile iron pipe of claim 1 production with mould, it is characterized in that: the method that described low temperature aging is handled is: the cast tube mould (1) after will using is placed on and can makes on its rotation tugboat group (2) of at the uniform velocity rotating, and cast tube mould (1) is evenly heated; Heating-up temperature remains between 150～250 ℃, and temperature retention time is more than 10 hours.
3, use the surface forging maintenance process of mould according to claim 1 or 2 described centrifugal process ductile iron pipe productions, it is characterized in that: when the cast tube mould (1) after described low temperature aging is handled insulation slowly cools to 150 ℃, bring into use working face to forge equipment, hot use down forge hammer to cast tube mould (1) important process face carry out repeatedly, forge processing uniformly, in this process, the surface temperature of cast tube mould (1) that keeps forging processing is more than 80 ℃.
4, use the surface forging maintenance process of mould according to claim 1 or 2 described centrifugal process ductile iron pipe productions, it is characterized in that:
The described hammer that forges that forges processing, the ball-type carbide alloy tup of use diameter 1～8mm;
The amplitude of forging is that working face is forged working face to forge cup depth be 0.1～2mm;
Forging is taken taxi and is forged density and forged the distance that working face two forges between the depression to be not more than 2 times of indenture diameters.
5, according to the production of the described centrifugal process ductile iron pipe of claim 1 with the surface forging maintenance process of mould, it is characterized in that: the process of the surface forging under hot in the described forging maintenance process is:
1), the rotation tugboat group of utilizing (2) drives cast tube mould (1) rotation;
2), the coal gas water back (5) that picks out two 20mm diameters from gas piping puts in that the some coal gas heats cast tube mould (1) in the mould bell and spigot;
3), adjust rotation tugboat group (2) rotating speed at 0.5 rev/min;
4), adjust the coal gas size, temperature is controlled between 150～250 ℃, keep cast tube mould (1) temperature substantially constant.
5), must keep more than 10 hours heat time heating time.
6), heating mould is after 10 hours, close gas valve and cut off gas supply, when making cast tube mould (1) on rotation tugboat group (2), slowly cool to 150 ℃ of left and right sides, transport to working face and forge on the equipment, hot use down forge hammer to bell and spigot from port one rice with interior surface carry out repeatedly, working face forges uniformly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101450315A CN101658914B (en) | 2009-09-21 | 2009-09-21 | Surface forging maintenance process of mold for the production of graphite cast iron pipe by centrifugal method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101450315A CN101658914B (en) | 2009-09-21 | 2009-09-21 | Surface forging maintenance process of mold for the production of graphite cast iron pipe by centrifugal method |
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| Publication Number | Publication Date |
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| CN101658914A true CN101658914A (en) | 2010-03-03 |
| CN101658914B CN101658914B (en) | 2011-05-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103978178A (en) * | 2014-05-20 | 2014-08-13 | 新兴铸管股份有限公司 | Multifunctional mould maintaining device |
| CN104550591A (en) * | 2014-12-27 | 2015-04-29 | 江苏苏南重工机械科技有限公司 | Method for repairing small deformation and hydrogen-induced cracks of forgings |
| CN106002082A (en) * | 2016-08-04 | 2016-10-12 | 新兴铸管股份有限公司 | Pipe die bellmouth repairing method |
| CN106541063A (en) * | 2016-11-25 | 2017-03-29 | 广西科技大学 | A kind of high-strength ductile cast iron forging method |
-
2009
- 2009-09-21 CN CN2009101450315A patent/CN101658914B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103978178A (en) * | 2014-05-20 | 2014-08-13 | 新兴铸管股份有限公司 | Multifunctional mould maintaining device |
| CN103978178B (en) * | 2014-05-20 | 2015-09-16 | 新兴铸管股份有限公司 | Multifunctional mold attending device |
| CN104550591A (en) * | 2014-12-27 | 2015-04-29 | 江苏苏南重工机械科技有限公司 | Method for repairing small deformation and hydrogen-induced cracks of forgings |
| CN106002082A (en) * | 2016-08-04 | 2016-10-12 | 新兴铸管股份有限公司 | Pipe die bellmouth repairing method |
| CN106002082B (en) * | 2016-08-04 | 2018-03-06 | 新兴铸管股份有限公司 | A kind of pipe die bellmouth restorative procedure |
| CN106541063A (en) * | 2016-11-25 | 2017-03-29 | 广西科技大学 | A kind of high-strength ductile cast iron forging method |
| CN106541063B (en) * | 2016-11-25 | 2018-10-12 | 广西科技大学 | A kind of high-strength ductile cast iron forging method |
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| Publication number | Publication date |
|---|---|
| CN101658914B (en) | 2011-05-11 |
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