CN105268938A - Vertical centrifugal casting device for manufacturing concentric reducers - Google Patents
Vertical centrifugal casting device for manufacturing concentric reducers Download PDFInfo
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- CN105268938A CN105268938A CN201410315968.3A CN201410315968A CN105268938A CN 105268938 A CN105268938 A CN 105268938A CN 201410315968 A CN201410315968 A CN 201410315968A CN 105268938 A CN105268938 A CN 105268938A
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Abstract
A vertical centrifugal casting device for manufacturing concentric reducers comprises a vertical centrifugal machine and a die assembly. The vertical centrifugal machine comprises a centrifugal machine main motor, a centrifugal machine host and a centrifugal machine flange plate. The die assembly comprises a die, a die cushion plate and a die cover plate. The vertical centrifugal casting device for manufacturing concentric reducers is easy and convenient to use, efficient and beneficial to large-scale industrial production. Besides, by means of the vertical centrifugal casting device, the casting quality of products can be improved, the rejection rate can be decreased, the normal-temperature and high-temperature mechanical properties of the products can be improved, and the service life can be prolonged.
Description
Technical field
The invention belongs to machine casting technical field, be specifically related to a kind of vertical centrifugal casting device for the preparation of Concentric Reducers.
Background technology
Reduced pipe is widely used in the hydrogen manufacturing conversion furnace of petroleum chemical industry, and be the critical piece of transmission reformed gas, condition of work is high temperature pressurized state, therefore requires that it has good normal temperature mechanical performance and high-temperature mechanical property.
At present, the manufacture of reduced pipe generally adopts static casting technique, also claims gravitational casting, and namely molten steel arrives mold cavity forming through cast gate, running channel under the effect of gravitational field, and foundry goods carries out feeding by the Action of Gravity Field of molten steel in rising head in cooled and solidified process.What this technique was the most conventional is resin bonded sand mould casting or water-glass sand mold casting, and idiographic flow generally includes following step: (1) makes wooden model (apperance and core box); (2) mulling moulding, makes core; (3) core made and sand mold are assembled, determine position and the size of running gate system; (4) cast is implemented; (5) sand removal after foundry goods cooling, polishing, be machined to final finished.
Static casting technique is simple, and product can meet the basic application requirement under high-temperature and high-pressure conditions, but whole technique exists distinct disadvantage, such as: need to make apperance and core box, and need to make sand mold and core, production process is many, consuming time, production efficiency is low; Need core and the accurate matched moulds of sand mold, complicated operation; The foundry goods of casting complete also needs machined again after sand removal, polishing, adds production process; It is crucial that cast structure is irregular and not fine and close, easily produces the product quality defect such as pore, slag inclusion, and mechanical performance is superior not, and service life is also undesirable, and product rejection rate is higher.
Summary of the invention
For overcoming the deficiencies in the prior art, the invention provides a kind of vertical centrifugal casting device for the preparation of Concentric Reducers.This device is easy to use, efficient, is beneficial to large-scale industrial production, and can improve the casting quality of product, reduces scrappage, improves normal temperature and the high-temperature mechanical property of product, increases the service life.
Concrete technical scheme of the present invention is as follows:
A kind of vertical centrifugal casting device for the preparation of Concentric Reducers, comprise vertical centrifugal machine and die assembly, described vertical centrifugal machine comprises centrifuge mair motor 1, centrifuge main frame 2 and centrifuge ring flange 3, and described die assembly comprises mould 4, die backing plate 5 and die cover plate 6;
Wherein:
Centrifuge main frame 2 is connected with centrifuge mair motor 1, and centrifuge ring flange 3 is positioned on centrifuge main frame 2;
Mould 4 is vertically arranged on centrifuge ring flange 3 by securing member;
Die backing plate 5 is positioned at the bottom of mould 4, is fixed on centrifuge ring flange 3 by the seam of mould 4 lower end;
Die cover plate 6 is positioned at mould 4 top, is fixed on mould 4 top by the seam of mould 4 upper end and/or securing member.
In above-mentioned centrifugal casting equipment, the material of mould 4 can be cast iron, cast steel or forging.Mould internal via shape is identical with the outer wall shape of reduced pipe product, and size is slightly larger than the final size (reserved amount of contraction and allowance) of reduced pipe product, and this mainly considers molten steel shrinkage factor and post-production needs.Generally speaking, mold cavity (i.e. mould endoporus) size=product outside dimension+product outside dimension × molten steel shrinkage factor+allowance.Wherein, molten steel shrinkage factor and allowance are known to those skilled in the art and easily determine.As a rule, molten steel shrinkage factor is 1%-3%, and allowance is 20-50mm.
Described securing member can be the ordinary elements of mechanical field, such as bolt and nut component, pin control etc.
The material of die backing plate 5 is high temperature resistant asbestos board, Main Function for prevent casting time metal liquid and centrifuge ring flange 3 stick together.
The material of die cover plate 6 is high temperature resistant asbestos board, Main Function for prevent casting time metal liquid splash out from mould 4.
Optionally, above-mentioned centrifugal casting equipment can also be provided with cooling-part at the outer surface of mould 4, as invested the water-cooling section of mold outer surface, in order to the cooling of auxiliary molten steel in forming process.
Centrifugal casting equipment of the present invention is used for the preparation of Concentric Reducers, usually can comprise the steps: to assemble after die assembly preheating; The molten steel of molten state is injected in mold cavity fast; Make molten steel cooling forming under High Rotation Speed state; Stop centrifugal, take out foundry goods, obtain product through aft-loaded airfoil.
According to products application requirement, centrifugal casting equipment of the present invention can be used for the reduced pipe product manufacturing various material.
Vertical centrifugal casting device of the present invention is easy and simple to handle, can effectively enhance productivity; Further, utilize the obtained product of this device to have obvious performance advantage compared to static foundry goods, its advantage is mainly reflected in the following aspects:
(1), during vertical centrifugal casting, the casting mold outer wall cooling rate of rotation is fast, so be the consecutive solidification by ecto-entad during casting solidification, the Tissue distribution of formation is regular.The product metallographic structure of static casting is radially distribute irregular column crystal and equiax crystal, and the product of vertical centrifugal casting is distributed as tiny equiax crystal-column crystal-thicker equiax crystal successively from outer radial internal diameter direction.In view of mainly radially stressed under reduced pipe duty, therefore the metallographic structure that centrifugal casting product is radially regularly arranged just can to requiring, workpiece in working order lower stress evenly, can effectively improve product mechanical performance, reduce scrappage, increase the service life.
(2) because the centrifugal force force of gravity that causes of the reason of directional solidification and rotation is large, can obtain stronger feeding when centrifugal casting is solidified, the foundry goods of formative tissue densification, thus significantly reduce the probability of defect such as generation pore, crackle etc., raising casting quality.
(3) when rotation limit in casting mold limit is solidified, each layer is different relative to the rotary speed of die cavity, cause and just fracture at the crystal grain of crystalline growth, thus make foundry goods finally obtain tiny crystal grain, tiny crystal grain and orderly metallographic structure create the mechanical performance that centrifugal casting is better than static foundry goods.
Based on above-mentioned advantage, utilize vertical centrifugal casting device of the present invention effectively can improve the casting quality of product, reduce scrappage, improve normal temperature and the high-temperature mechanical property of product, increase the service life; Compared to existing product, in product quality, mechanical performance with in service life, there is clear superiority.
brief Description Of Drawings
Fig. 1 is the structural representation of vertical centrifugal casting device of the present invention, wherein: 1-centrifuge mair motor, and 2-centrifuge main frame, 3-centrifuge ring flange, 4-mould, 5-die backing plate, 6-die cover plate.
Fig. 2 is that the penetrant inspection of Concentric Reducers prepared by embodiment detects.
Detailed description of the invention
Below by way of specific embodiment, technical scheme of the present invention is described further, but is not limiting the scope of the invention.
Embodiment
1, the pre-set dimension (unit: mm) of Concentric Reducers product
External diameter φ 418/ φ 280, internal diameter φ 360/ φ 220, H=360.
2, device
Centrifuge adopts J556 type vertical centrifugal-casting machine.
According to Concentric Reducers foundry goods outer wall shape and size, with 35CrMo II for mold materials, adopt casting or be forged into mould, wherein, the size=product outside dimension × 1.02+30mm of mold cavity.After Mould Machining is shaping, in mold cavity, even application thickness is about the alcohol zircon flour coating of 1.0mm.
3, centrifugal casting
Adopt vertical centrifugal casting device of the present invention to prepare Concentric Reducers, comprise the following steps:
(1) by die assembly 300 DEG C of preheatings, then as shown in Figure 1, be arranged on centrifuge ring flange 3;
(2) 1610 of 190kg DEG C of molten steel are poured in mould 4 fast, open rapidly centrifuge after sealing to 850r/min, keep 20 minutes, be then down to 700r/min, stop centrifugal after 20 minutes;
(3) foundry goods of cooling is taken out from mould, be worked into the product size of needs.
4, Performance Detection and sign
A, penetrant inspection
According to JB/T4730.5-2005, penetrant inspection (PT) is carried out to product external surfaces.Result is as shown in Figure 2: product surface quality is good, does not find the defects such as pore, slag inclusion, crackle.
B, metallographic detect
Machine cuts gets foundry goods two ends, adopts macroscopical metallographic test instrument (100 ×) to do the experiment of macroscopical metallographic.Result shows, the metallographic structure distribution rule at two ends is orderly, is followed successively by tiny equiax crystal-column crystal-thicker equiax crystal along casting mold outer radial internal diameter.
C, mechanical property test
Radially cut tensile sample, according to GB/T228-2002, under normal temperature (25 DEG C), do product tension test.Result shows, and the room temperature tensile strength Rm of product is about 470MPa.
comparative example
Use equivalent material, adopt traditional static casting technique to prepare static foundry goods, and characterize its correlated performance, result shows: product metallographic structure is radially distribute irregular column crystal and equiax crystal; There is obvious pore, slag inclusion and crackle in surface; Under normal temperature (25 DEG C), Rm is about 455MPa.
Claims (5)
1. the vertical centrifugal casting device for the preparation of Concentric Reducers, comprise vertical centrifugal machine and die assembly, described vertical centrifugal machine comprises centrifuge mair motor (1), centrifuge main frame (2) and centrifuge ring flange (3), and described die assembly comprises mould (4), die backing plate (5) and die cover plate (6);
The internal via shape of mould (4) is identical with the outer wall shape of Concentric Reducers product;
Wherein:
Centrifuge main frame (2) is connected with centrifuge mair motor (1), and centrifuge ring flange (3) is positioned on centrifuge main frame (2);
Mould (4) is vertically arranged on centrifuge ring flange (3) by securing member;
Die backing plate (5) is positioned at the bottom of mould (4), is fixed on centrifuge ring flange (3) by the seam of mould (4) lower end;
Die cover plate (6) is positioned at mould (4) top, is fixed on mould (4) top by the seam of mould (4) upper end and/or securing member.
2. vertical centrifugal casting device according to claim 1, is characterized in that: the material of mould (4) is selected from cast iron, cast steel or forging.
3. vertical centrifugal casting device according to claim 1, is characterized in that: mould hole size=product outside dimension+product outside dimension × molten steel shrinkage factor+allowance.
4. vertical centrifugal casting device according to claim 1, is characterized in that: the material of die backing plate (5) and die cover plate (6) is high temperature resistant asbestos board.
5. vertical centrifugal casting device according to claim 1, is characterized in that: the outer surface of mould (4) is provided with cooling-part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410315968.3A CN105268938A (en) | 2014-07-04 | 2014-07-04 | Vertical centrifugal casting device for manufacturing concentric reducers |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410315968.3A CN105268938A (en) | 2014-07-04 | 2014-07-04 | Vertical centrifugal casting device for manufacturing concentric reducers |
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| CN105268938A true CN105268938A (en) | 2016-01-27 |
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| CN201410315968.3A Pending CN105268938A (en) | 2014-07-04 | 2014-07-04 | Vertical centrifugal casting device for manufacturing concentric reducers |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08117965A (en) * | 1994-10-21 | 1996-05-14 | Nippon Steel Corp | Production of composite roll made by centrifugal casting |
| CN1748908A (en) * | 2005-10-09 | 2006-03-22 | 常玉堂 | Process for producing integrated roller ring of thin plate blank continuous casting and continuous rolling heating furnace roller |
| CN101049628A (en) * | 2007-03-17 | 2007-10-10 | 中国第一重型机械集团公司 | Sliding roll neck casting mould method in use for casting large supporting roller of integral casting cast steel |
| CN101503010A (en) * | 2009-01-21 | 2009-08-12 | 成都三强轧辊股份有限公司 | Steel ring wear-resistant casting parts and method for producing the same |
| CN201529762U (en) * | 2009-12-16 | 2010-07-21 | 天水华荣铸造机械有限公司 | Large-size vertical centrifugal casting machine |
| CN103231037A (en) * | 2013-04-24 | 2013-08-07 | 江苏双勤民生冶化设备制造有限公司 | Method for manufacturing short transitional section |
| KR20130088286A (en) * | 2012-01-31 | 2013-08-08 | 현대제철 주식회사 | Method for manufacturing rolling roll |
| CN203917854U (en) * | 2014-07-04 | 2014-11-05 | 江苏双勤民生冶化设备制造有限公司 | A kind of vertical centrifugal casting device for the preparation of Concentric Reducers |
-
2014
- 2014-07-04 CN CN201410315968.3A patent/CN105268938A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08117965A (en) * | 1994-10-21 | 1996-05-14 | Nippon Steel Corp | Production of composite roll made by centrifugal casting |
| CN1748908A (en) * | 2005-10-09 | 2006-03-22 | 常玉堂 | Process for producing integrated roller ring of thin plate blank continuous casting and continuous rolling heating furnace roller |
| CN101049628A (en) * | 2007-03-17 | 2007-10-10 | 中国第一重型机械集团公司 | Sliding roll neck casting mould method in use for casting large supporting roller of integral casting cast steel |
| CN101503010A (en) * | 2009-01-21 | 2009-08-12 | 成都三强轧辊股份有限公司 | Steel ring wear-resistant casting parts and method for producing the same |
| CN201529762U (en) * | 2009-12-16 | 2010-07-21 | 天水华荣铸造机械有限公司 | Large-size vertical centrifugal casting machine |
| KR20130088286A (en) * | 2012-01-31 | 2013-08-08 | 현대제철 주식회사 | Method for manufacturing rolling roll |
| CN103231037A (en) * | 2013-04-24 | 2013-08-07 | 江苏双勤民生冶化设备制造有限公司 | Method for manufacturing short transitional section |
| CN203917854U (en) * | 2014-07-04 | 2014-11-05 | 江苏双勤民生冶化设备制造有限公司 | A kind of vertical centrifugal casting device for the preparation of Concentric Reducers |
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Application publication date: 20160127 |