CN101704084A - Centrifugal cast tube die and manufacturing technique thereof - Google Patents
Centrifugal cast tube die and manufacturing technique thereof Download PDFInfo
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- CN101704084A CN101704084A CN200910075885A CN200910075885A CN101704084A CN 101704084 A CN101704084 A CN 101704084A CN 200910075885 A CN200910075885 A CN 200910075885A CN 200910075885 A CN200910075885 A CN 200910075885A CN 101704084 A CN101704084 A CN 101704084A
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Abstract
The invention discloses a centrifugal cast tube die and manufacturing technique thereof. The centrifugal cast tube die is made of metal material, and the alloy of the inner layer of the tube wall is a composite heat-resisting die steel layer. The matched technique method comprises: adopting centrifugal casting technique to finish shaping the outer layer of the tube wall of the centrifugal cast tube die by using the metal shaping cavity; when the outer layer metal of the tube wall of the centrifugal cast tube die cools to a temperature 20-100 DEG C lower than liquidus temperature, casting melt heat-resisting die steel on the inner surface for forming composite layer, and utilizing high speed rotation of the metal shaping cavity and the physical and chemical change between the metals of the inner layer and outer layer to realize centrifugal shaping of the composite tube blank; ejecting the tube after the alloy is completely solidified to form a blank of the composite cast tube die having complete metallurgy combination layer; trimming the inner surface and outer surface of the blank of the cast tube die and testing performance thereof, and carrying out periodical rolling and deforming by hot flaring technique to finally process into the cast tube die. For the cast tube die manufactured by the invention, heat and fatigue resisting performance is obviously improved, cracking on inner surface is remarkably delayed and service life is greatly prolonged.
Description
Technical field
The present invention relates to metallurgical technology field, more particularly, relate to a kind of centrifugal cast tube die and manufacture craft thereof.
Background technology
At present, cold modulus method spun cast pipe technology is very ripe, and its rhythm of production is fast in addition, the efficient height, all basically in, the small dimension ductile iron pipe all adopts this technology.Centrifugal casting method is produced in the employed mould of ductile iron pipe, and most important parts are exactly pipe die.Because pipe die directly contacts with high temperature liquid iron, condition of work is quite abominable.Therefore, the life-span of pipe die is shorter relatively.
According to statistics, the life-span of general pipe die has only 6000-8000 to prop up, and promptly a pipe die can use about 6000-8000 time until damaging.Thereby the expense of pipe die is occupied significant proportion in the cast tube selling price.What traditional cold modulus method pipe die adopted is the 21CrMo10 pipe die of single material, and its fatigue failure form generally is the pipe die inwall and cracks, and finally causes producing waste product in the casting process and scraps.The life-span that pipe is touched is directly connected to the quality and the economic benefit of enterprises of product.
Summary of the invention
Technical problem to be solved by this invention has provided a kind of centrifugal cast tube die structure and manufacture craft thereof, with service life of improving pipe die and the probability that reduces cast steel generation waste product in the production.
For achieving the above object, the invention provides following technical scheme:
Be compounded with the refractory steel layer on the inner surface of tube wall of described cast tube mould, form the tube wall of inside and outside two-layer alloy, the inside and outside two-layer complete metallurgical binding of tube wall.
The refractory steel composite bed is to adopt the 20CrMoWV material, and thickness is not less than 20mm.
Outer wall adopts common heat resisting steel or Mayari.
Outer wall is to add chromium, molybdenum, v element in common heat resisting steel when adopting Mayari, and above element accounts for alloy heat resisting steel percentage by weight and is: chromium: 1.0-2.0%, and molybdenum:＜0.4%, vanadium: 0.03-0.05%.
The manufacture craft of supporting centrifugal cast tube die, comprise adopt centrifugal casting technology, by metal mold cavity, finish the moulding of cast tube die blank, when key is that the outer tube parietal layer of cast tube mould is cooled to following 20～100 ℃ of liquidus temperature, inner surface is watered the refractory steel molten mass that forms composite bed, rotates at a high speed with physical-chemical reaction by metal mold cavity and realizes the composite bed centrifugal forming:
Treat to carry out ejector sleeve after the molten metal cooling is also solidified fully, generate the cast tube die blank of lamination layer structure with complete metallurgical binding layer.
Behind processing of cast tube die blank surfaces externally and internally and service check,, finally be processed into the cast tube mould through pepriodic rolling and hot enlarging process distortions.
The main thought that the present invention solves the problems of the technologies described above is: pass through to increase alloying elements in cast tube mould inner alloy, improve the heat-resistant anti-fatigue performance of cast tube mould, delay the cracking of inwall, just can improve the service life of pipe die greatly. like this, have enough strength support as long as guarantee the pipe beyond the metal of endosexine, just can guarantee the service life of cast tube mould. above design is by the alloy-layer of the compound premium properties of inner surface of cast tube mould, form cast tube mould inner surface thermal fatigue resistance premium properties, the effect that realization increases the service life is fully possible. under the principle of the bond strength that guarantees the composite bed transition interface, the degree of precious metal element in the heat-resisting alloy in the suitable reduction outer wall, can effectively offset the complicated and cast tube mould inner surface of tube wall composite bed noble metal dosage ratio of technology cost strengthens the cost that causes and raises. and that considers cast tube die life again prolongs the effect of bringing significantly, and overall economic efficiency obviously improves.
From above-mentioned technical scheme as can be seen, by adding alloy element, mainly be chromium, tungsten, v element among the present invention at the pipe die internal layer, successfully develop compound cast tube mould under the wall layers support, that the top layer thermal fatigue resistance is good.Cast tube mould internal layer adopts heat-resisting alloy mould steel, directly improves the heat-resistant anti-fatigue performance of cast tube mould, delays the cracking of inwall, the service life that just can improve pipe die greatly.The present invention and existing pipe die test contrast can prolong 30～50% service life and become the strongest evidence.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The metal tube mode structure schematic diagram that Fig. 1 provides for the embodiment of the invention;
Fig. 2 for the hot enlarging of metal pipe die that provides for the embodiment of the invention after structural representation.
Wherein 1 is the outer wall of cast tube mould, and 2 is the composite bed of cast tube mould.
The specific embodiment
The invention discloses a kind of structure and manufacture craft of cast tube mould, with service life of improving pipe die in the centrifugal casting and the probability that reduces steel pipe generation waste product in the production.
Cast tube mould structure among the present invention has following characteristics:
The metal material manufacturing of cast tube mould has the refractory steel composite bed on the inner surface of tube wall of described cast tube mould.
The refractory steel composite bed is to adopt the 20CrMoWV material, in this material included each alloying element refractory steel shared percentage by weight be C:0.16～0.24; Si:0.20～0.50; Mn:0.30～0.60; P :≤0.015; S≤0.012; Cr:2.0～2.6; Mo:0.40～1.0; W:0.60～1.10; V:0.03～0.06, the thickness of composite bed are not less than 20 millimeters.
Outer wall adopts common heat resisting steel, or Mayari.
Outer wall is to add chromium, molybdenum, v element in common heat resisting steel when adopting Mayari, and above element at the shared percentage by weight of alloy heat resisting steel is: chromium: 1.0-2.0%, molybdenum＜0.4%, vanadium 0.03-0.05%.
The supporting manufacture craft of centrifugal cast tube die may further comprise the steps:
Comprise adopt centrifugal casting technology, by metal mold cavity, finish the moulding of cast tube die blank, it is characterized in that:
When the outer wall for the treatment of the cast tube mould was cooled to following 20～100 ℃ of liquidus temperature, inner surface was watered the refractory steel fused solution that forms composite bed, rotated at a high speed and physicochemical change realizes the composite bed centrifugal forming by metal mold cavity:
Treat to carry out ejector sleeve after the molten metal cooling, generate cast tube die blank with lamination layer structure;
Cast tube die blank surfaces externally and internally is handled and service check.
Then the cast tube die blank is carried out following processes:
The cast tube die blank is carried out preheating, the cast tube die blank is heated to 1100～1250 ℃, this temperature can be determined according to the performance of selected alloy, generally be heated to complete austenitizing and get final product.
The cast tube die blank is carried out pepriodic rolling, promptly on milling train the cast tube die blank is rolled down to certain appearance and size, concrete tube blank size is determined by the concrete pipe die specification of wanting to process;
The cast tube die blank is carried out enlarging handle, after being about to the cast tube die blank and being heated to 880～1000 ℃, on pipe-expanding machine, an end of cast tube die blank is expanded as tubaeformly, generate the cast tube mould;
The cast tube die surface is carried out final physical, chemical treatment, carry out service check then.
In the manufacture craft of above-mentioned cast tube mould, when metal mold cavity is carried out pre-hot-working, the hot mould wash of surface spraying within it, coating layer thickness generally is controlled at 1.5～2.8 millimeters, and guarantees that coating is smooth, evenly.Covering slag and wash heat technology in the centrifugal casting process, have been adopted in addition; the applicant had once applied on July 24th, 2008 that name is called the patent of " bimetal clad pipe blank, its production method and production equipment thereof with transition zone ", had carried out detailed argumentation to covering slag in the centrifugal casting process and wash heat technology in this patent application document.
In sum, the improvement of the present invention by the cast tube mould structure increases the heat-resistant anti-fatigue performance with high temperature contact surface material, delays the cracking of inner surface, improved service life greatly.Like this, have enough support strengths as long as guarantee the mould outer wall.The present invention only needs to increase high-load heat-resisting alloy element in cast tube mould inner surface metal material, just can guarantee the service life of pipe die, keeps at the pipe die cost under the situation of original level or raising slightly, and obviously improved the service life of pipe die.
Claims (8)
1. a centrifugal cast tube die is used the metal material manufacturing, it is characterized in that, with the refractory steel composite bed, forms the tube wall of inside and outside two-layer alloy, the complete metallurgical binding of two-layer alloy on the inner surface of tube wall of described cast tube mould.
2. centrifugal cast tube die according to claim 1 is characterized in that the refractory steel composite bed is to adopt the 20CrMoWV material, and thickness is not less than 20mm.
3. centrifugal cast tube die according to claim 2 is characterized in that outer wall adopts common heat resisting steel or Mayari.
4. centrifugal cast tube die according to claim 3, it is characterized in that when outer wall adopts Mayari be to add chromium, molybdenum, v element in common heat resisting steel, above element at the shared percentage by weight of alloy heat resisting steel is: chromium: 1.0-2.0%, molybdenum is less than 0.4%, vanadium 0.03-0.05%.
5. according to the manufacture craft of the described centrifugal cast tube die of arbitrary claim among the claim 1-4, comprise adopt centrifugal casting technology, by metal mold cavity, finish the moulding of cast tube die blank, it is characterized in that:
When the outer tube parietal layer for the treatment of the cast tube mould was cooled to following 20～100 ℃ of liquidus temperature, inner surface was watered the refractory steel fused solution that forms composite bed, rotated at a high speed and physicochemical change realizes the composite bed centrifugal forming by metal mold cavity:
Treat to carry out ejector sleeve after the molten metal cooling is also solidified fully, generate cast tube die blank with complete metallurgical binding lamination layer structure;
To cast tube die blank surfaces externally and internally handle with service check after, through pepriodic rolling and hot enlarging process distortions, finally be processed into the cast tube mould.
6. the manufacture craft of centrifugal cast tube die according to claim 5 is characterized in that the cast tube die blank is carried out pepriodic rolling and hot enlarging technology comprises:
The cast tube die blank is heated to complete austenitizing;
On milling train, the cast tube die blank is rolled;
After the cast tube die blank heating, on pipe-expanding machine an end of cast tube die blank being enlarged becomes tubaeformly, generates the cast tube mould;
Cast tube mould surfaces externally and internally is carried out physics, chemical treatment, service check.
7. the manufacture craft of centrifugal cast tube die according to claim 5, it is characterized in that: before cast, metal mold cavity is carried out preheating, and the thermodyn process of surface spraying within it coating, coating layer thickness generally is controlled at 1.5～2.8 millimeters, and guarantee that coating is smooth, evenly.
8. the manufacture craft of centrifugal cast tube die according to claim 5 is characterized in that: adopted covering slag and wash heat technology in casting process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100758850A CN101704084B (en) | 2009-11-09 | 2009-11-09 | Centrifugal cast tube die and manufacturing technique thereof |
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| CN2009100758850A CN101704084B (en) | 2009-11-09 | 2009-11-09 | Centrifugal cast tube die and manufacturing technique thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102343430A (en) * | 2011-09-21 | 2012-02-08 | 三一重工股份有限公司 | Bimetallic composite conveying pipe and production process thereof |
| CN103658580A (en) * | 2013-12-10 | 2014-03-26 | 江苏宏宝集团有限公司 | Alloy pipe production process |
| CN106180584A (en) * | 2016-08-10 | 2016-12-07 | 安徽禹王铸业有限公司 | A kind of flexible anti-shock cast iron pipe preparation technology |
| CN106825271A (en) * | 2016-12-23 | 2017-06-13 | 内蒙古北方重工业集团有限公司 | The processing method that heavy caliber thick wall extrudes cast pipe mold enlarging |
| CN112296266A (en) * | 2020-11-02 | 2021-02-02 | 王德忠 | High-pressure water pump alloy shell molding casting technology |
| CN112548117A (en) * | 2020-11-06 | 2021-03-26 | 山东国铭球墨铸管科技有限公司 | Manufacturing process of plastic-lined special pipe and nodular cast iron pipe manufactured by applying same |
| CN114101335A (en) * | 2021-11-30 | 2022-03-01 | 成都先进金属材料产业技术研究院股份有限公司 | Method for manufacturing large-caliber double-layer metal composite pipe |
| CN114101335B (en) * | 2021-11-30 | 2024-06-07 | 成都先进金属材料产业技术研究院股份有限公司 | Manufacturing method of large-caliber double-layer metal composite pipe |
-
2009
- 2009-11-09 CN CN2009100758850A patent/CN101704084B/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102343430A (en) * | 2011-09-21 | 2012-02-08 | 三一重工股份有限公司 | Bimetallic composite conveying pipe and production process thereof |
| CN102343430B (en) * | 2011-09-21 | 2014-05-21 | 三一汽车制造有限公司 | Bimetallic composite conveying pipe and production process thereof |
| CN103658580A (en) * | 2013-12-10 | 2014-03-26 | 江苏宏宝集团有限公司 | Alloy pipe production process |
| CN106180584A (en) * | 2016-08-10 | 2016-12-07 | 安徽禹王铸业有限公司 | A kind of flexible anti-shock cast iron pipe preparation technology |
| CN106825271A (en) * | 2016-12-23 | 2017-06-13 | 内蒙古北方重工业集团有限公司 | The processing method that heavy caliber thick wall extrudes cast pipe mold enlarging |
| CN112296266A (en) * | 2020-11-02 | 2021-02-02 | 王德忠 | High-pressure water pump alloy shell molding casting technology |
| CN112548117A (en) * | 2020-11-06 | 2021-03-26 | 山东国铭球墨铸管科技有限公司 | Manufacturing process of plastic-lined special pipe and nodular cast iron pipe manufactured by applying same |
| CN112548117B (en) * | 2020-11-06 | 2023-02-17 | 国铭铸管股份有限公司 | Manufacturing process of plastic-lined special pipe and nodular cast iron pipe manufactured by applying same |
| CN114101335A (en) * | 2021-11-30 | 2022-03-01 | 成都先进金属材料产业技术研究院股份有限公司 | Method for manufacturing large-caliber double-layer metal composite pipe |
| CN114101335B (en) * | 2021-11-30 | 2024-06-07 | 成都先进金属材料产业技术研究院股份有限公司 | Manufacturing method of large-caliber double-layer metal composite pipe |
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| CN101704084B (en) | 2012-04-18 |
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