CN101623748A - Method for manufacturing water-cooling type pipe dies - Google Patents
Method for manufacturing water-cooling type pipe dies Download PDFInfo
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- CN101623748A CN101623748A CN200910075109A CN200910075109A CN101623748A CN 101623748 A CN101623748 A CN 101623748A CN 200910075109 A CN200910075109 A CN 200910075109A CN 200910075109 A CN200910075109 A CN 200910075109A CN 101623748 A CN101623748 A CN 101623748A
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Abstract
The invention discloses a method for manufacturing water-cooling type pipe dies, which comprises the following technical steps: (1) calculating the size of a centrifugal blank of a water-cooling type pipe die according to the size and the processing amount of a finished product of the water-cooling type pipe die and further confirming the size of a centrifugal die cavity of the water-cooling type pipe die; (2) confirming the charging material proportion according to chemical components of the finished product of the water-cooling type pipe die; (3) melting and refining proportioned charging materials according to the requirements of a centrifugal cast technology on the quality of molten steel; (4) pouring refined molten steel into the centrifugal die cavity of the water-cooling type pipe die and solidifying the molten steel to form a cylinder-shaped water-cooling type pipe die blank under the action of centrifugal force; and (5) processing the molded water-cooling type pipe die blank into the finished product of the water-cooling type pipe die. The method for manufacturing water-cooling type pipe dies is suitable for manufacturing the water-cooling type pipe dies with various diameters and has high material utilization ratio and low manufacture cost.
Description
Technical field
The present invention relates to a kind of manufacture method of mould, especially a kind of manufacture method that is used for the water-cooling type pipe dies of spun cast pipe.
Background technology
The existing pipe die technology of making is: (1) cast iron pipe die.Because material capability is low, the stress influence of being heated, therefore embrittlement easily do not used in the ductile centrifugal cast tube, since cheap, in centrifugal sewage pipe production, still have use, and although service life is low, but comprehensive cost and cost are lower.(2) cast steel pipe die.Be applied to the production of heavy caliber hot-die spun cast pipe, because heavy caliber hot-die centrifuge pipe die adopts the alloy pipe die of solid forging comparatively difficult, cost is also very high, therefore adopts the cast steel pipe die more.The cast steel pipe die generally adopts the manufacturing process of segmentation casting and processing, equipment condition is not had special requirement, manufacturing expense economy.Cast-steel pipe ought to be annotated castability, required composition even, and body does not have casting flaw, and foundry goods should carry out annealing in process, should carry out modifier treatment after the processing, guaranteed material property.The cast steel pipe die can not be used for the production of water-cooled centrifuge, because its performance does not satisfy the impact of thermal change stress.(3) forged steel pipe die.The forged steel pipe die is a water-cooled centrifuge pipe die commonly used, and its performance can be born the impact of thermal change stress, has certain service life (tubule mould life-span nearly ten thousand times).Its manufacturing and processing technology are comparatively complicated, should strictly control gas content in the molten steel in the steelmaking process, hydrogen is required to be controlled at below the 2ppm, prevent that " hydrogen embrittlement " phenomenon takes place material under the condition of effect of thermal change stress, therefore need carry out external refining and vacuum outgas and handle.Should adopt three-dimensional Forging Technology in the forging process, lattice be formed on three directions of X-Y-Z as far as possible wait the axle crystallization, avoid the identical inconsistent phenomenon that do not take place of stretching displacement of all directions under the thermal stress effect.Pipe die after the processing should be annealed and modifier treatment, eliminates the residual stress of material, and further crystal grain thinning is given full play to the performance of material.(4) plate welded tube mould.Sign in the heavy caliber pipe die and adopt comparatively difficulty of forged steel pipe die production, and adopt cast steel pipe die material capability undesirable, the life-span is low, and emerging cast tube has been developed the new technology of rolling up, being welded into the shape blank with steel plate.The rolled alloy steel plate, China Wuyang iron company can produce in batches at present, the equipment of the said firm's steel-making and heavy plate rolling heat treatment, flaw detection is comparatively advanced, material composition and de aerated water on average surpass forged steel blank quality level since rolling be single-phase rolling, difficulty possesses a property of grade, but because rolling ratio is much larger than forging, crystal grain is thinner than forged steel pieces, and equity axle performance remedies to some extent, therefore can substitute forged steel fully with regard to material.
Plate welded tube mould is adopted the pulse gas-shielded weldering of intercuspal space, the quality height of weld seam, and the influence of butt welded seam periphery material is very little, so the overall performance of welding back material does not descend.Because steel plate has certain thickness, minor diameter forms difficulty, so the pipe die processing of process limitations more than bore DN800, and application surface is restricted, and from result of use, has surpassed the forged steel pipe die.
Analyze the prior art condition: in above-mentioned 4 kinds of technologies, forge pipe die and plate welded tube mould and be mainly used in water-cooling type pipe dies, the specification of palette welded tube mould is generally more than DN800, so the following water-cooling type pipe dies technology of DN800 has only forging method.Forging Technology is divided into big two classes: the above pipe die manufacturing of Φ 500mm is the technology that cored bar forges after the punching of employing steel ingot; The following pipe die manufacturing of Φ 500mm is to adopt steel ingot to forge into the technology of washing in a pan material behind the solid blank.The reason of classification is, because the pipe die blank is oversize, the die forging temperature drop is too fast, and it is thin partially that the following pipe die of Φ 500mm is made plug, easily curved, easily wraps plug.The stock utilization of this technology is all lower, below 40%.So the Forging Technology cost is higher.Therefore, studying a kind of manufacture method that is fit to the water-cooling type pipe dies of various diameter water-cooling type pipe dies manufacturings, stock utilization height, low cost of manufacture, is the present technical issues that need to address.
Summary of the invention
Technical problem to be solved by this invention provides a kind of manufacture method that is fit to the water-cooling type pipe dies of various diameter water-cooling type pipe dies manufacturings, stock utilization height, low cost of manufacture.
The technical scheme that the present invention solves its technical problem is:
A kind of manufacture method of water-cooling type pipe dies, its processing step is: 1. calculate centrifugal base size of water-cooling type pipe dies and the further centrifugal mold die cavity size of determining water-cooling type pipe dies according to water-cooling type pipe dies finished size and processing capacity, 2. determine charge composition according to the chemical composition of water-cooling type pipe dies finished product, 3. by the requirement of centrifugal casting technique to the molten steel quality, furnace charge fusing and refining that proportioning is good, 4. the molten steel after the refining is poured in the centrifugal mold die cavity of water-cooling type pipe dies, make molten steel be frozen into cartridge type water-cooling type pipe dies blank under action of centrifugal force, 5. the water-cooling type pipe dies blank with moulding is processed into the water-cooling type pipe dies finished product.
The technical scheme that the present invention solves its technical problem can also be:
The present invention is before the molten steel cast, centrifugal mold with water-cooling type pipe dies carries out low-temperature prewarming earlier, get inner surface at the centrifugal mold of water-cooling type pipe dies again and spray one deck heat-resistance high-strength degree coating, two ends with the centrifugal mold of water-cooling type pipe dies install baffle plate simultaneously, opening centrifuge then makes the centrifugal mold low speed rotation of water-cooling type pipe dies carry out low-temperature bake, after reaching technological requirement, can cast, when beginning to cast, improve the rotating speed of the centrifugal mold of water-cooling type pipe dies, the change rotary speed of not stopping, molten steel rotates at a high speed and constantly changes under the situation of rotating speed at the centrifugal mold of water-cooling type pipe dies and is poured into rapidly in the centrifugal mold of water-cooling type pipe dies, after finishing casting, centrifugal mold outside at water-cooling type pipe dies sprays cooling, after treating the cooling of water-cooling type pipe dies blank, the water-cooling type pipe dies blank is extracted in the centrifugal mold of water-cooling type pipe dies, after extracting in time to the heat treatment of annealing of water-cooling type pipe dies blank.
Furnace charge of the present invention is molten into and utilizes electric arc furnaces, according to electric arc furnace smelting technology furnace charge is melted, and described refining is to utilize the VOD stove gas in the molten steel and inclusion content to be reduced to the content of regulation.
Water-cooling type pipe dies blank of the present invention processing comprises that first roughing, Pilger are rolling, the hot expansion in end, end replenish built-up welding, second and process roughly and fine finishining.
Roughing of the present invention is to remove the even protruding thorn of water-cooling type pipe dies blank outer surface and the centrifugal slag blanket of removal inner surface with lathe, and service check and whole flaw detection are carried out in sampling then, and what performance was qualified fully is the water-cooling type pipe dies semi-finished product.
Pilger of the present invention is rolling rolling for the water-cooling type pipe dies semi-finished product are carried out Pilger on the Pilger roll mill, described Pilger is rolling to be the rolling forging rolling of Pilger, its roll direction of rotation is opposite with the rolled piece feeding direction, roll pass is the change section along circumference, the anti-feeding direction operation of rolled piece when rolling, the lengthening coefficient of rolled piece is 7-15.
End of the present invention heat expansion is carried out end cover half pushing heat expansion or drawing heat and is expanded for after the half-finished end of the water-cooling type pipe dies after the roughing is heated with end heating furnace or induction coil on thermal expansion machine.
It is with the method for the end after the expansion of water-cooling type pipe dies semi-finished product heat by the additional built-up welding of outer surface that end of the present invention replenishes built-up welding, makes its end thickness reach the second rough machined thickness requirement.
Second roughing of the present invention will be for replenishing the half-finished size that is worked into regulation of water-cooling type pipe dies after the built-up welding.
Fine finishining of the present invention will be carried out modified heat treatment earlier for the water-cooling type pipe dies semi-finished product after second roughing are worked into finished size through the water-cooling type pipe dies semi-finished product after second roughing before the fine finishining.
The invention has the beneficial effects as follows:
Stock utilization height, low cost of manufacture.
The specific embodiment
A kind of manufacture method of water-cooling type pipe dies, its processing step is: 1. calculate centrifugal base size of water-cooling type pipe dies and the further centrifugal mold die cavity size of determining water-cooling type pipe dies according to water-cooling type pipe dies finished size and processing capacity, 2. determine charge composition according to the chemical composition of water-cooling type pipe dies finished product, 3. by the requirement of centrifugal casting technique to the molten steel quality, furnace charge fusing and refining that proportioning is good, 4. the molten steel after the refining is poured in the centrifugal mold die cavity of water-cooling type pipe dies, make molten steel be frozen into cartridge type water-cooling type pipe dies blank under action of centrifugal force, 5. the water-cooling type pipe dies blank with moulding is processed into the water-cooling type pipe dies finished product.Before the molten steel cast, centrifugal mold with water-cooling type pipe dies carries out low-temperature prewarming earlier, get inner surface at the centrifugal mold of water-cooling type pipe dies again and spray one deck heat-resistance high-strength degree coating, two ends with the centrifugal mold of water-cooling type pipe dies install baffle plate simultaneously, opening centrifuge then makes the centrifugal mold low speed rotation of water-cooling type pipe dies carry out low-temperature bake, after reaching technological requirement, can cast, when beginning to cast, improve the rotating speed of the centrifugal mold of water-cooling type pipe dies, the change rotary speed of not stopping, molten steel rotates at a high speed and constantly changes under the situation of rotating speed at the centrifugal mold of water-cooling type pipe dies and is poured into rapidly in the centrifugal mold of water-cooling type pipe dies, after finishing casting, centrifugal mold outside at water-cooling type pipe dies sprays cooling, after treating the cooling of water-cooling type pipe dies blank, the water-cooling type pipe dies blank is extracted in the centrifugal mold of water-cooling type pipe dies, after extracting in time to the heat treatment of annealing of water-cooling type pipe dies blank.Described furnace charge is molten into and utilizes electric arc furnaces, according to electric arc furnace smelting technology furnace charge is melted, and described refining is to utilize the VOD stove gas in the molten steel and inclusion content to be reduced to the content of regulation.The processing of described water-cooling type pipe dies blank comprises that first roughing, Pilger are rolling, the hot expansion in end, end replenish built-up welding, second and process roughly and fine finishining.Described roughing is to remove the even protruding thorn of water-cooling type pipe dies blank outer surface and the centrifugal slag blanket of removal inner surface with lathe, and service check and whole flaw detection are carried out in sampling then, and what performance was qualified fully is the water-cooling type pipe dies semi-finished product.Described Pilger is rolling rolling for the water-cooling type pipe dies semi-finished product are carried out Pilger on the Pilger roll mill, described Pilger is rolling to be the rolling forging rolling of Pilger, its roll direction of rotation is opposite with the rolled piece feeding direction, roll pass is the change section along circumference, the anti-feeding direction operation of rolled piece when rolling, the lengthening coefficient of rolled piece is 7-15.The heat expansion of described end is carried out end cover half pushing heat expansion or drawing heat and is expanded for after the half-finished end of the water-cooling type pipe dies after the roughing is heated with end heating furnace or induction coil on thermal expansion machine.It is with the method for the end after the expansion of water-cooling type pipe dies semi-finished product heat by the additional built-up welding of outer surface that described end replenishes built-up welding, makes its end thickness reach the second rough machined thickness requirement.Described second roughing will be for replenishing the half-finished size that is worked into regulation of water-cooling type pipe dies after the built-up welding.Described fine finishining will be carried out modified heat treatment earlier for the water-cooling type pipe dies semi-finished product after second roughing are worked into finished size through the water-cooling type pipe dies semi-finished product after second roughing before the fine finishining.
Claims (10)
1, a kind of manufacture method of water-cooling type pipe dies, it is characterized in that: its processing step is: 1. calculate centrifugal base size of water-cooling type pipe dies and the further centrifugal mold die cavity size of determining water-cooling type pipe dies according to water-cooling type pipe dies finished size and processing capacity, 2. determine charge composition according to the chemical composition of water-cooling type pipe dies finished product, 3. by the requirement of centrifugal casting technique to the molten steel quality, furnace charge fusing and refining that proportioning is good, 4. the molten steel after the refining is poured in the centrifugal mold die cavity of water-cooling type pipe dies, make molten steel be frozen into cartridge type water-cooling type pipe dies blank under action of centrifugal force, 5. the water-cooling type pipe dies blank with moulding is processed into the water-cooling type pipe dies finished product.
2, the manufacture method of a kind of water-cooling type pipe dies according to claim 1, it is characterized in that: before the molten steel cast, centrifugal mold with water-cooling type pipe dies carries out low-temperature prewarming earlier, get inner surface at the centrifugal mold of water-cooling type pipe dies again and spray one deck heat-resistance high-strength degree coating, two ends with the centrifugal mold of water-cooling type pipe dies install baffle plate simultaneously, opening centrifuge then makes the centrifugal mold low speed rotation of water-cooling type pipe dies carry out low-temperature bake, after reaching technological requirement, can cast, when beginning to cast, improve the rotating speed of the centrifugal mold of water-cooling type pipe dies, the change rotary speed of not stopping, molten steel rotates at a high speed and constantly changes under the situation of rotating speed at the centrifugal mold of water-cooling type pipe dies and is poured into rapidly in the centrifugal mold of water-cooling type pipe dies, after finishing casting, centrifugal mold outside at water-cooling type pipe dies sprays cooling, after treating water-cooling type pipe dies blank cooling, the water-cooling type pipe dies blank is extracted in the centrifugal mold of water-cooling type pipe dies, after extracting in time to the heat treatment of annealing of water-cooling type pipe dies blank.
3, the manufacture method of a kind of water-cooling type pipe dies according to claim 1 and 2, it is characterized in that: described furnace charge is molten into and utilizes electric arc furnaces, according to electric arc furnace smelting technology furnace charge is melted, described refining is to utilize the VOD stove gas in the molten steel and inclusion content to be reduced to the content of regulation.
4, the manufacture method of a kind of water-cooling type pipe dies according to claim 3 is characterized in that: the processing of described water-cooling type pipe dies blank comprises that first roughing, Pilger are rolling, the hot expansion in end, end replenish built-up welding, second and process roughly and fine finishining.
5, the manufacture method of a kind of water-cooling type pipe dies according to claim 4, it is characterized in that: described roughing is to remove the even protruding thorn of water-cooling type pipe dies blank outer surface and the centrifugal slag blanket of removal inner surface with lathe, service check and whole flaw detection are carried out in sampling then, and what performance was qualified fully is the water-cooling type pipe dies semi-finished product.
6, the manufacture method of a kind of water-cooling type pipe dies according to claim 5, it is characterized in that: described Pilger is rolling rolling for the water-cooling type pipe dies semi-finished product are carried out Pilger on the Pilger roll mill, described Pilger is rolling to be the rolling forging rolling of Pilger, its roll direction of rotation is opposite with the rolled piece feeding direction, roll pass is the change section along circumference, the anti-feeding direction operation of rolled piece when rolling, the lengthening coefficient of rolled piece is 7-15.
7, the manufacture method of a kind of water-cooling type pipe dies according to claim 6, it is characterized in that: the heat expansion of described end is carried out end cover half pushing heat expansion or drawing heat and is expanded for after the half-finished end of the water-cooling type pipe dies after the roughing is heated with end heating furnace or induction coil on thermal expansion machine.
8, the manufacture method of according to claim 7 kind of water-cooling type pipe dies, it is characterized in that: described end replenishes built-up welding for the method for the end after water-cooling type pipe dies semi-finished product heat is expanded by the additional built-up welding of outer surface, makes its end thickness reach the second rough machined thickness requirement.
9, the manufacture method of a kind of water-cooling type pipe dies according to claim 8 is characterized in that: described second roughing will be for replenishing the half-finished size that is worked into regulation of water-cooling type pipe dies after the built-up welding.
10, the manufacture method of a kind of water-cooling type pipe dies according to claim 9, it is characterized in that: described fine finishining will be carried out modified heat treatment earlier for the water-cooling type pipe dies semi-finished product after second roughing are worked into finished size through the water-cooling type pipe dies semi-finished product after second roughing before the fine finishining.
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| CN200910075109A CN101623748A (en) | 2009-08-06 | 2009-08-06 | Method for manufacturing water-cooling type pipe dies |
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| CN200910075109A CN101623748A (en) | 2009-08-06 | 2009-08-06 | Method for manufacturing water-cooling type pipe dies |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102240897A (en) * | 2011-05-09 | 2011-11-16 | 新兴铸管股份有限公司 | Method for manufacturing water-cooling type double-metal pipe die |
| CN102825238A (en) * | 2012-09-19 | 2012-12-19 | 临汾鹏泰伟业有限公司 | Cooling method for casting thick-walled steel pipe |
| CN103658580A (en) * | 2013-12-10 | 2014-03-26 | 江苏宏宝集团有限公司 | Alloy pipe production process |
| CN105268864A (en) * | 2015-11-16 | 2016-01-27 | 安徽省凌锋冶金机械有限公司 | Method for manufacturing floor heating pipeline groove forming combination die |
-
2009
- 2009-08-06 CN CN200910075109A patent/CN101623748A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102240897A (en) * | 2011-05-09 | 2011-11-16 | 新兴铸管股份有限公司 | Method for manufacturing water-cooling type double-metal pipe die |
| CN102825238A (en) * | 2012-09-19 | 2012-12-19 | 临汾鹏泰伟业有限公司 | Cooling method for casting thick-walled steel pipe |
| CN103658580A (en) * | 2013-12-10 | 2014-03-26 | 江苏宏宝集团有限公司 | Alloy pipe production process |
| CN105268864A (en) * | 2015-11-16 | 2016-01-27 | 安徽省凌锋冶金机械有限公司 | Method for manufacturing floor heating pipeline groove forming combination die |
| CN105268864B (en) * | 2015-11-16 | 2017-04-26 | 安徽省凌锋冶金机械有限公司 | Method for manufacturing floor heating pipeline groove forming combination die |
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Open date: 20100113 |