CN102145374A - Manufacturing method for expandable polystyrene pattern of bimetallic composite elbow - Google Patents
Manufacturing method for expandable polystyrene pattern of bimetallic composite elbow Download PDFInfo
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- CN102145374A CN102145374A CN201010111637XA CN201010111637A CN102145374A CN 102145374 A CN102145374 A CN 102145374A CN 201010111637X A CN201010111637X A CN 201010111637XA CN 201010111637 A CN201010111637 A CN 201010111637A CN 102145374 A CN102145374 A CN 102145374A
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Abstract
The invention discloses a manufacturing method for an expandable polystyrene pattern of a bimetallic composite elbow. An outer layer of the composite elbow adopts steel pipes, an inner layer adopts abrasion-resistant alloy materials, and two layers of metal are molded through the vacuum evaporable pattern casting process. The casting process for the abrasion-resistant layer comprises the steps of processing an evaporable pattern assembly of the elbow by an expandable polystyrene (EPS) quick molding machine; splicing and adhering to the inner layer of the elbow; and finally carrying out the vacuum evaporable pattern casting process. The manufacturing method has the beneficial effects that the manufacturing process of the expandable polystyrene pattern is simple and feasible, and the dimensional accuracy is high; moreover, the splicing of the pattern assembly in the pipe is simple and accurate, and the production efficiency and casting quality of the composite elbow are greatly improved. The abrasion-resistant and lightweight elbow with the thickness of the composite layer smaller than 10mm can be manufactured through the method, and the method can be widely applicable to transportation of ore pulp, coal paste, muddy sand, limestone, solid wastes and the like and improves the abrasion resistance while reducing the material cost.
Description
Technical field
The present invention relates to a kind of manufacture method of polystyrene foam plastics apperance of bimetallic composite-curve, be specially adapted to the high abrasion of solid material conveying, the wearing layer casting of lightweight bend pipe.
Background technology
In industries such as metallurgy, coal, chemical industry, water conservancy, environmental protection, petrochemical industry, mine, electric power and geothermal energy resources, material mainly utilizes pressure to transport by conveyance conduit, as air pressure, hydraulic pressure and gravity inertial etc.Conveyance conduit is bearing sizable pressure at work, and is standing serious corrosion and wearing and tearing, and especially in the conveying of solid or mixed material, the abrasion condition of bend pipe is even more serious.Material by the time because action of centrifugal force, the wearing and tearing of bend pipe outer wall are much larger than straight tube.So use the good bend pipe of anti-wear performance to reducing wearing and tearing, prolongation service life of equipment, minimizing replacing parts number of times and energy-saving and emission-reduction, protection environment aspect all have important value.
Use more pipeline material in the current production composite bimetal pipe, ceramic-lined pipe and glass-ceramic tubre are arranged.Wherein, glass-ceramic tubre is eliminated gradually with the extensive application of composite bimetal pipe and ceramic-lined pipe.Ceramic-lined pipe mainly divides two kinds of the ceramic-lined pipe of self-propagating combustion and ceramic pasters.There are tissue looseness, problem that hole ratio is high from spreading internal lining pipe that method makes, during the conveying solid substance material, still can't resolve the big problem of wear extent; And,, and use powerful bonding agent lining to paste although structurally design mutually nested structure for ceramic paster technology, still keep away unavoidable paster collapse formula to peel off, thereby cause the worn out serious problems of pipeline.And for small-bore pipeline, ceramic paster method technology difficulty of construction is very big, even can't realize.Therefore, the use amount of bimetal compound pipeline increases day by day.This technology mainly adopts the manufacturing of founding casing with vacuum method, and the skin of pipeline adopts ordinary carbon steel or low-alloy steel steel pipe, and internal layer adopts the high-wear-resistant alloy material, makes at the inboard casting of outer layer pipe one deck high-wear-resistant alloy material by technique of founding casing with vacuum.The subject matter that this technology exists at present has two: the first, and wear-resistant composite bed thickness is generally greater than more than the 16mm; The second, antifriction alloy and steel can not be realized metallurgy and mechanical bond, and the slit maximum can reach 5mm between two layers of material.Chinese patent 200910065370.2 discloses a kind of bimetal wear resistant composite tube, and the composite-curve in this patent adopts lost foam casting process to make, but wherein also unexposed for the manufacture method of polystyrene foam plastics apperance; Foam plastics mould can cause two layers of material directly to have bigger slit when the inside pipe wall conformal attaches in addition.The preparation method of disappearance mould is divided into foaming and machine-shaping two big classes usually both at home and abroad at present.Adopt foaming machine or foam device to make for the mass-produced manufacturing of middle cute appearance in batch, this method the moulding, also needs expensive metal die except that needs in special equipment more.Apperance for single-piece or small lot batch manufacture then adopts and makes the wooden model similar methods, is processed into from foam plastics slab with mechanical or manual, and the hand-built working (machining) efficiency is low, precision and poor surface smoothness; And traditional machining needs multiple lathe and cutter cooperation to finish, and drops into more.
Summary of the invention
The object of the present invention is to provide a kind of manufacture method of polystyrene foam plastics apperance of bimetallic composite-curve, this method can be produced high abrasion, the lightweight bimetallic composite-curve of compound bed thickness less than 10mm.The wearing layer of this bend pipe and outer layer metal are fitted closely, and the casting accuracy height can be widely used in the conveying of ore pulp, coal slurry, silt particle, lime stone, solid waste etc.Can reduce solid material in carrying material consumption and improve pipeline service life.
The present invention realizes with following technical scheme: a kind of manufacture method of polystyrene foam plastics apperance of bimetallic composite-curve is characterized in that, according to camber radius and the wearing layer inside and outside wall diameter design apperance geometry and the size of bend pipe; Utilize the EPS rapidform machine that the foamed plastics blank is processed the disappearance mould apperance assembly that obtains the bend pipe wearing layer, assembly unit is bonded on the metallic steel inside pipe wall again.
There is distance in the inwall center of circle of described polystyrene foam plastics apperance than the skew of the outer wall center of circle, makes bend pipe outside antifriction alloy layer thickness greater than the inboard.
Described wearing layer disappearance mould apperance is divided into symmetrical two groups of submodule samples or six groups of submodule samples being divided into four groups of submodule samples of symmetry or being divided into symmetry are made respectively, and excision forming generates assembly structure again, and the submodule sample is spliced into disappearance mould apperance.
The processing radian of apperance assembly inside and outside wall increases certain angle α, utilizes the plasticity of foamed plastics itself and the interaction between the apperance assembly, and inwall is close in automatic bending during assembly unit in managing.
Submodule sample composition surface adopts trapezoidal faces to splice, and has both guaranteed the installation accuracy of apperance in pipe, can make apperance be close to tube wall again, has effectively guaranteed casting accuracy and castability.
The foam mould spline structure is when design, the inwall center of circle to the inboard skew of bend pipe certain distance δ, by increasing the wall thickness in the outside, suitably reduces inboard wall thickness than the outer wall center of circle, thereby fully saving under the prerequisite of antifriction alloy consumption, further improving the anti-wear performance of bend pipe integral body.
According to the internal diameter and the requirement of wearing layer bed thickness of bend pipe, the degree of eccentricity of design apperance, parting line.According to the plasticity and the toughness of selected foam plastics slab, design processing radian 2 π/n-α, n are for cutting apart the group number, and generally speaking, α chooses 3%～5% of design radian.
According to the camber radius and the above parameter of bend pipe, the design size of apperance assembly is scaled processing dimension carries out cutting processing.Utilize the plasticity of foamed plastics itself and the interaction between the apperance assembly, in elbow internal wall, inwall is close in bending automatically with the assembly unit of apperance assembly.
Basic fundamental principle of the present invention is: operation is simple, quick, can accurately make disappearance mould apperance fast according to different bend pipe sizes and wearing layer thickness, model is fitted closely with outer layer metal in pipe, the original casting technique condition of a whole set of process makes full use, the technological transformation cost is low, and is easy to utilize.
Employing the invention has the beneficial effects as follows:
1. the thickness of wearing layer can be reduced to below the 10mm, and precision can reach 0.1mm.
2. there are not the slit in wearing layer and outer layer metal in conjunction with closely.
3. under the situation that does not increase material usage, improve the overall wear resistance energy of bend pipe.
Description of drawings
Fig. 1 is a bimetallic composite-curve structural representation of the present invention.
Fig. 2 is the A-A face cutaway view of Fig. 1.
Fig. 3 is the straight board size conversion of left and right sides apperance
The symbol that relates among the figure is represented respectively: 1--outer layer pipe, 2--internal layer wearing layer, the trapezoidal Mosaic face of 3-, R--wearing layer exterior radius, r--wearing layer inwall radius, O
R, O
r--the wearing layer inwall center of circle and the outer wall center of circle, δ--the wearing layer inwall center of circle and outer wall center of circle side-play amount, α--processing radian reduction, R '--wearing layer outer wall processing radius, r '--wearing layer inwall processing radius, O
R', O
r'--the wearing layer processing inwall center of circle and the outer wall center of circle.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the present invention are described further.
Embodiment: the splitting scheme n of present embodiment apperance is 2, and the mould apperance that is about to disappear is divided into symmetrical two groups of submodule samples makes respectively, and excision forming generates assembly structure again, and the submodule sample is spliced into apperance.Concrete steps are as follows:
1. as depicted in figs. 1 and 2, according to the internal diameter and the requirement of wearing layer bed thickness of bend pipe, the degree of eccentricity δ of design apperance, parting line (also can adopt the scheme of quartering or six-distribution method).According to the plasticity and the toughness of selected foam plastics slab, design processing radian 2 π/(generally speaking, α chooses 3%～5% of design radian to n-α.N is a splitting scheme, and this example n is 2).
2. the design size with the apperance assembly is scaled processing dimension, and left assembly processing dimension is seen Fig. 3.R′＝πR/(π-α)，r′＝πr/(π-α)，θ′＝π-α。Trapezoidal size is decided according to the size of Mosaic face, and the trapezoidal thickness of last Mosaic face of left assembly is (R-r+ δ)/2, and length is R-r+ δ; The trapezoidal thickness of following Mosaic face is (R-r+ δ)/2, and length is R-r-δ.Also interchangeable the calculating of the trapezoidal size of corresponding right assembly.
3. in the EPS rapidform machine, import camber radius and each processing dimension of bend pipe, carry out the cutting processing of left and right sides apperance.Under the situation that processing dimension allows, select large scale foamed plastics section bar for use, can after a cutting processing, obtain many apperances.
4. on apperance outer wall and Mosaic face, smear micro-binder---polyvinyl butyral resin (BM), guarantee that apperance is in pipe in splicing and the applying, fill up slit that may exist and slight flaws between splicing place of submodule sample, apperance and the outer metal layers, thereby cause the appearance of wearing layer burning into sand situation when preventing follow-up sand casting because sand is oozed in the slit.
5. after the apperance inwall is brushed disappearance mould special coating, be respectively charged in the bend pipe, utilize the mutual splicing effect of the plasticity and the left and right sides apperance of foamed plastics itself, make the automatic bending of straight template die sample be close to inwall, remove the unnecessary binding agent that overflow at two ends.
6. then bend pipe is put into the dry solidification that baking oven or hothouse carry out binding agent and surface coating.Bend pipe after the oven dry can use the technology of vacuum (negative pressure) lost foam casting to carry out the moulding by casting of wearing layer.
Claims (7)
1. the manufacture method of the polystyrene foam plastics apperance of a bimetallic composite-curve is characterized in that, according to camber radius and the wearing layer inside and outside wall diameter design apperance geometry and the size of bend pipe; Utilize the EPS rapidform machine that the foamed plastics blank is processed the disappearance mould apperance assembly that obtains the bend pipe wearing layer, assembly unit is bonded on the metallic steel inside pipe wall again.
2. the manufacture method of the polystyrene foam plastics apperance of bimetallic composite-curve according to claim 1, it is characterized in that: there is distance in the inwall center of circle of polystyrene foam plastics apperance than the skew of the outer wall center of circle, makes bend pipe outside antifriction alloy layer thickness greater than the inboard.
3. the manufacture method of the polystyrene foam plastics apperance of bimetallic composite-curve according to claim 1, it is characterized in that: described wearing layer disappearance mould apperance is divided into symmetrical two groups of submodule samples and makes respectively, excision forming generates assembly structure again, and the submodule sample is spliced into apperance.
4. the manufacture method of the polystyrene foam plastics apperance of bimetallic composite-curve according to claim 1, it is characterized in that: described wearing layer disappearance mould apperance is divided into four groups of submodule samples of symmetry and makes respectively, excision forming generates assembly structure again, and the submodule sample is spliced into apperance.
5. the manufacture method of the polystyrene foam plastics apperance of bimetallic composite-curve according to claim 1, it is characterized in that: described wearing layer disappearance mould apperance is divided into six groups of submodule samples of symmetry and makes respectively, excision forming generates assembly structure again, and the submodule sample is spliced into apperance.
6. according to the manufacture method of the polystyrene foam plastics apperance of claim 3 or 4 or 5 described bimetallic composite-curves, it is characterized in that: the trapezoidal faces structure is adopted on the splicing composition surface of described each submodule sample.
7. the manufacture method of the polystyrene foam plastics apperance of bimetallic composite-curve according to claim 1, it is characterized in that: the processing radian of apperance assembly inside and outside wall increases certain angle α, utilize the plasticity of foamed plastics itself and the interaction between the apperance assembly, inwall is close in automatic bending during assembly unit in pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010111637XA CN102145374A (en) | 2010-02-09 | 2010-02-09 | Manufacturing method for expandable polystyrene pattern of bimetallic composite elbow |
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| CN201010111637XA CN102145374A (en) | 2010-02-09 | 2010-02-09 | Manufacturing method for expandable polystyrene pattern of bimetallic composite elbow |
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| CN102145374A true CN102145374A (en) | 2011-08-10 |
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| CN201010111637XA Pending CN102145374A (en) | 2010-02-09 | 2010-02-09 | Manufacturing method for expandable polystyrene pattern of bimetallic composite elbow |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688980A (en) * | 2012-06-15 | 2012-09-26 | 河海大学常州校区 | Environment-friendly casting molding sand and preparation method thereof |
| CN103008544A (en) * | 2012-12-06 | 2013-04-03 | 华中科技大学 | Bi-metal bent pipe manufacturing process based on evaporative pattern casting and vibration pouring |
| CN105500539A (en) * | 2016-01-20 | 2016-04-20 | 泰石岩棉有限公司 | Rock wool cutting device and method |
| CN107716860A (en) * | 2017-09-01 | 2018-02-23 | 东风精密铸造安徽有限公司 | A kind of coke guide side plate lost foam casting process method |
| CN108637171A (en) * | 2018-05-15 | 2018-10-12 | 芜湖新兴新材料产业园有限公司 | A kind of white template construct method of reducing pipe |
Citations (3)
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| JPH01237046A (en) * | 1988-03-17 | 1989-09-21 | Mazda Motor Corp | Method for casting lost foam pattern |
| JPH02182342A (en) * | 1988-12-30 | 1990-07-17 | Murata Mach Ltd | Manufacture of lost foam pattern |
| CN1759957A (en) * | 2005-10-27 | 2006-04-19 | 西安建筑科技大学 | Technique for manufacturing wearable pipe made from composite bimetal |
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2010
- 2010-02-09 CN CN201010111637XA patent/CN102145374A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01237046A (en) * | 1988-03-17 | 1989-09-21 | Mazda Motor Corp | Method for casting lost foam pattern |
| JPH02182342A (en) * | 1988-12-30 | 1990-07-17 | Murata Mach Ltd | Manufacture of lost foam pattern |
| CN1759957A (en) * | 2005-10-27 | 2006-04-19 | 西安建筑科技大学 | Technique for manufacturing wearable pipe made from composite bimetal |
Non-Patent Citations (1)
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| 许云华等: "用消失模真空吸铸法制备双金属复合弯管", 《热加工工艺》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688980A (en) * | 2012-06-15 | 2012-09-26 | 河海大学常州校区 | Environment-friendly casting molding sand and preparation method thereof |
| CN103008544A (en) * | 2012-12-06 | 2013-04-03 | 华中科技大学 | Bi-metal bent pipe manufacturing process based on evaporative pattern casting and vibration pouring |
| CN105500539A (en) * | 2016-01-20 | 2016-04-20 | 泰石岩棉有限公司 | Rock wool cutting device and method |
| CN107716860A (en) * | 2017-09-01 | 2018-02-23 | 东风精密铸造安徽有限公司 | A kind of coke guide side plate lost foam casting process method |
| CN108637171A (en) * | 2018-05-15 | 2018-10-12 | 芜湖新兴新材料产业园有限公司 | A kind of white template construct method of reducing pipe |
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Application publication date: 20110810 |