CN106513589A - Manufacture method of half-bent pipes - Google Patents
Manufacture method of half-bent pipes Download PDFInfo
- Publication number
- CN106513589A CN106513589A CN201611268911.8A CN201611268911A CN106513589A CN 106513589 A CN106513589 A CN 106513589A CN 201611268911 A CN201611268911 A CN 201611268911A CN 106513589 A CN106513589 A CN 106513589A
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- China
- Prior art keywords
- bend pipe
- half bend
- manufacture method
- die cavity
- ingate
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
Abstract
The invention discloses a manufacture method of half-bent pipes and belongs to the manufacture field of conveying bent pipe structures. The manufacture method of the half-bent pipes comprises the following steps: step A, preparing raw materials; step B, making a casting system; step C, melting raw materials; step D, molding by casting; and step E, carrying out heat treatment. A sand mold comprises a plurality of half-bent pipe cavities which are parallel with each other and are horizontally placed. The half-bent pipe cavities are manufactured according to the structures of the half-bent pipes, and the openings of the half-bent pipe cavities all face downwards. The objective of the invention is to overcome the defect that a large number of product flaws occur in the existing casting process of the half-bent pipes. The flaws of half-bent pipe products cast by the manufacture method of the half-bent pipes, provided by the invention, are greatly reduced.
Description
Technical field
The present invention relates to a kind of transporting elbow of the industry such as building, mine, metallurgy, electric power, oil, coal, grain processing
The manufacture of structure, more particularly, it relates to a kind of manufacture method of half bend pipe.
Background technology
The forming technique of bend pipe mainly has casting, compression molding etc., and they are all to rely on mould, by cast
Or hot cold-press process profiling generation；Either any machinery equipment and pipeline, major part all use bend pipe, mainly to
Convey various materials；The material of bend pipe has the materials such as cast iron, stainless steel, steel alloy, malleable cast iron, carbon steel, non-ferrous metal and plastics
Matter；In the industries such as building, mine, metallurgy, electric power, oil, coal, grain processing, the conveying of material is by pipeline pressure
Conveying, delivery pipe are subject to larger pressure and serious wear and tear.Therefore there is higher synthesis to delivery pipe, particularly bridge piece
Performance requirement, improves the service life of bend pipe, has become the difficult problem for being difficult to capture.
It is individual layer Technique of High Magnesium Bend Pipe that bend pipe is the most widely used at present, also has a small amount of using double-deck rich chromium cast iron bend pipe.
Individual layer Technique of High Magnesium Bend Pipe anti-wear performance is poor, and hardness is low, and security is low；Double-layer wear-resistant bend pipe high cost, quality are preferable, anti-wear performance
Excellent, hardness is high, safe, but cost performance is not high；Developing the good abrasion-proof bent tube of a kind of excellent performance, low cost, security is
Whole industry in the urgent need to the work carried out, by grasping under the mechanism and different working condition of pipe wear, the stream of material
Flowing mode, simulates pipeline region most easy to wear, and the region can be improved wearing layer thickness or improve the region material
Anti-wear performance, to reach the overall purpose for improving the bend pipe life-span, is that client is cost-effective, is that society economizes on resources.
Disclose with regard to the existing related art scheme of wear resistant and impact resistant bend pipe in prior art, such as patent publication No.：CN
204717206U, publication date：On October 21st, 2015, invention and created name is：A kind of outer overall, interior two points of two-layer equations are wear-resisting anti-
Impact bend pipe, this application case disclose a kind of outer overall, interior two points of two-layer equations wear resistant and impact resistant bend pipe, and it is by two points in outer entirety
Double-deck bend pipe, two wear-resisting adpting flanges, seam flange compositions；This outer overall, interior two points of two-layer equation wear resistant and impact resistants bend pipe is used
In the adverse circumstances of the industries such as building, mine, metallurgy, electric power, oil, coal, grain processing, outer overall, interior two points are designed as
Double-deck unique texture, is divided into protective layer and wearing layer, and anti-wear performance is good, long service life, and cost performance is high, easily realizes large quantities of
Amount production, steady quality reliability, security performance are high.
But, the technical problem that above-mentioned application case is present is：The structure of wherein half bend pipe belongs to the abnormity of casting field
, there is large-tonnage product defect in part, how to overcome large-tonnage product defect present in above-mentioned casting process in its casting process, be existing
There is the technical problem of urgent need to resolve in technology.
The content of the invention
1. invention technical problem to be solved
It is an object of the invention to there is large-tonnage product defect in overcoming the shortcomings of the casting process of existing half bend pipe, there is provided
A kind of manufacture method of half bend pipe, its half bend pipe product defects for casting out are substantially reduced.
2. technical scheme
To reach above-mentioned purpose, the technical scheme that the present invention is provided is：
The manufacture method of half bend pipe of the present invention, half bend pipe is the half that a bend pipe is cut vertically, and this is half curved
Manage the half near wrap direction side for the bend pipe；Comprise the following steps：
Step A, raw material configuration；
Step B, running gate system make；
Step C, raw material melting；
Step D, moulding by casting；
Step E, heat treatment.
As further improvement of the present invention, half bend pipe be designed as from ends A to middle B it is thickening with both sides C to
Middle D is thickening.
As further improvement of the present invention, in step B：Sand mold is made by clay, the sand mold includes some
It is individual be parallel to each other and horizontal positioned half bend pipe die cavity, structure fabrication of the half bend pipe die cavity according to half bend pipe, and described
The opening of half bend pipe die cavity is downward；Same ingate is connected with the respective side of two neighboring half bend pipe die cavity, this is interior to pour
Road is connected with sprue by the cross gate above which, and sprue is connected with the cup above which.
As further improvement of the present invention, the ingate be one along half bend pipe die cavity side camber bar shaped square
Shape chamber.
As further improvement of the present invention, the cross gate on the upside of which be on half bent tube type cavity length direction by
Between two inclined-planes extending to both sides, the cross gate on the downside of which is and the arcwall face coordinated on the upside of the ingate.
Used as further improvement of the present invention, each ingate includes some sections, fills between adjacent two sections of ingates
There is clay layer.
Used as further improvement of the present invention, the cross gate is provided with the contraction mouth to contract, the contraction mouth
Lateral cross section is zigzag, and contraction mouth is near cross gate and the connectivity part of ingate.
Used as further improvement of the present invention, the centre on the upside of the half bend pipe die cavity is provided with rising head, the rising head and half
Bend pipe die cavity connectivity part is up big and down small trapezoidal chamber.
As further improvement of the present invention, in step A, starting material element includes following by mass percentage：C：
3.6-3.8%, Cr：26～28%, Mo：0.3～0.5%, Cu：0.4～0.5%, Ni：0.6～0.8%, V：0.3～0.5%,
Si, Mn≤0.8%, P, S≤0.04%.
3. beneficial effect
The technical scheme provided using the present invention, compared with prior art, with following remarkable result：
(1) according to incompletely statistics, the market of domestic and international plumbing installations is more than 100,000,000,000 yuan, and the bend pipe of concrete mixer disappears
Consumption also has tens yuan, consumes steel hundreds of thousands ton.The service life of conventional pumps car Technique of High Magnesium Bend Pipe in 10,000 sides or so, and
Using half bend pipe of present invention manufacture, its service life is verified more than 40,000 sides through actual production, therefore, the present embodiment system
Half bend pipe made has wide market prospects, while also complying with national energy-saving reduction of discharging, clean and effective, the product of green circulatory development
Industry policy.
(2) in the present invention, ingate be one along half bend pipe die cavity side camber bar shaped rectangular cavity, cross gate is on the upside of which
Be two inclined-planes extended from centre to both sides on half bent tube type cavity length direction, cross gate on the downside of which be with the upside of ingate
The arcwall face of cooperation, is designed by the special construction of ingate and cross gate, molten iron can be caused uniformly gently to flow into half curved
In tubular cavity, the castability final so as to significantly improve half bend pipe, it is to avoid large-tonnage product defect.
(3) in the present invention, the thickness of two sides of half bend pipe is relatively thin, easily occurs deformation herein after casting, and in the present invention
Half bend pipe of manufacture is used cooperatively with miscellaneous part, therefore the requirement to size is very strict, based on this, in the present invention,
Arranging each ingate includes some sections, fills clay layer between adjacent two sections of ingates, as ingate is using dividing for being spaced
Segmentation structure so that the respective side of two neighboring half bend pipe die cavity is difficult that small change occurs because of the overall solidification of ingate
Shape, so as to greatly improve the dimensional accuracy of half bend pipe casting.
Description of the drawings
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below by to be used attached needed for embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, thus be not construed as it is right
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can be with according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is the structural representation of half bend pipe in embodiment 1；
Fig. 2 is the cross section structure schematic diagram of half bend pipe in embodiment 1；
Fig. 3 is the vertical section structure schematic diagram of half bend pipe in embodiment 1；
Fig. 4 is the main structure diagram of sand mold in embodiment 1；
Fig. 5 is the overlooking the structure diagram (being not drawn into cup and sprue) of sand mold in embodiment 1；
Fig. 6 is the structural representation (being not drawn into half bend pipe die cavity) in Fig. 5 along Z-direction；
Fig. 7 is the structural representation at X in Fig. 5 along Y-direction；
Flow charts of the Fig. 8 for the manufacture method of half bend pipe of embodiment 1.
Label declaration in schematic diagram：1st, half bend pipe；2nd, half bend pipe die cavity；201st, rising head；202nd, cup；203rd, it is horizontal to pour
Road；2031st, contraction mouth；204th, ingate.
Specific embodiment
To make purpose, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention, rather than the embodiment of whole.Therefore, embodiments of the invention below to providing in the accompanying drawings
Detailed description be not intended to limit the scope of claimed invention, but be merely representative of the selected embodiment of the present invention.
Based on the embodiment in the present invention, it is all that those of ordinary skill in the art are obtained under the premise of creative work is not made
Other embodiment, belongs to the scope of protection of the invention.
To further appreciate that present disclosure, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1
With reference to Fig. 1～8, the manufacture method of half bend pipe of the present embodiment, wherein, half bend pipe 1 is cut vertically for a bend pipe
Half, and half bend pipe 1 be bend pipe near wrap direction side half, in concrete the present embodiment, half bend pipe 1 be designed as from
Ends A is thickening thickening to middle D with both sides C to middle B.The present embodiment specifically includes following steps：Step A, raw material configuration；Step
Rapid B, running gate system make；Step C, raw material melting；Step D, moulding by casting；Step E, heat treatment.
Wherein, in step A, starting material element includes following by mass percentage：C：3.6-3.8%, Cr：26～28%, Mo：
0.3～0.5%, Cu：0.4～0.5%, Ni：0.6～0.8%, V：0.3～0.5%, Si, Mn≤0.8%, P, S≤
0.04%, the raw material of above-mentioned mass percent cooperates, and Jing actual productions checking, the wear resistance of high-chromium iron which casts out are big
Big to improve, service life is more than 3 times of common high-manganese steel, and product hardness can reach HRC：63～65.
In step B：By clay make sand mold, the sand mold include several be parallel to each other and horizontal positioned half bent tube type
Chamber 2, structure fabrication of the half bend pipe die cavity 2 according to half bend pipe 1, and the opening of half bend pipe die cavity 2 is downward；Two neighboring half is curved
Same ingate 204 is connected with the respective side of tubular cavity 2, the ingate 204 is poured with perpendicular by the cross gate 203 above which
Road is connected, and sprue is connected with the cup 202 above which.
Ingate 204 be one along half bend pipe die cavity, 2 side camber bar shaped rectangular cavity, cross gate 203 on the upside of which be
Two inclined-planes extended from centre to both sides on half bend pipe die cavity, 2 length direction, cross gate 203 on the downside of which is and ingate 204
The arcwall face that upside coordinates, each ingate 204 include some sections, and clay layer is filled between adjacent two sections of ingates 204；It is horizontal
Running channel 203 is provided with the contraction mouth 2031 to contract, and the lateral cross section of the contraction mouth 2031 is zigzag, and contraction mouth 2031
Near cross gate 203 and the connectivity part of ingate 204；Centre on the upside of half bend pipe die cavity 2 is provided with rising head 201, the rising head 201 with
Half bend pipe die cavity, 2 connectivity part is up big and down small trapezoidal chamber.
In the present embodiment, half bend pipe 1 is mainly used in cement pump truck delivery pipe junction, for conveying cement, due to being in
Specific position, is easier to abrasion, and past material therefor is stamping steel plate, high manganese steel material etc., is easy to abrasion, and service life is not
It is long, it is considered to which that anti-wear performance will be got well, so high chromium cast iron material is adopted in the present embodiment, produced with casting method.In the present embodiment
Half bend pipe 1 of manufacture, analyzes from product structure, and the product wall unevenness is even, and wall thickness very thin (thick middle, four sides are thin), most thick
Position dimension is 18mm, and most thin position dimension is only 5mm (being located at the both sides of half bend pipe 1), and wall thickness differs 1/2, can list casting in
Special-shaped thin wall part in industry, belongs to the product of difficult and complicated cases in casting industry.Inventor is curved in propose the present embodiment half
Before the manufacture method of pipe, lot of experiments is carried out, but as half bend pipe 1 belongs to thin-wall special-shaped pipe, wall unevenness is even, installed
Require harsh, occur in that large-tonnage product defect during foundry trial, scrappage remain high always (scrappage up to 50% with
On), its process of the test substantially is as follows：As hardness requirement is high, casting rich chromium cast iron production is used instead by original steel plate punched, it is raw
Production. art is lost foam process, and the difficult point of evaporative pattern production technology, as product structure belongs to tubulose and is carried just in moulding
Angle, the moulding sand degree of packing of shaking can not reach requirement, and product wall thickness is thin, thinnest part 5mm so that moulding intensity can not reach,
Easily routed case and deformation, and also easily occur the phenomenon of misrun in product wall thickness thin location, therefore, lost foam process mainly lacks
Fall into is burst case, misrun and deformation；The production of varying level moulding line is attempted afterwards and vertical moulding line is produced, but
Bring difference and be difficult to the product defectses that overcome, such as cold shut, core are loose, shrinkage cavity the problems such as.Through summarizing failure test
Experience, inventor find, it is desirable to which the step for avoiding product defects most critical is taken into full account in the manufacturing process of running gate system
Various factors, and existing sand mold is improved, verify through follow-up test of many times：Using the sand mould structure in the present embodiment, energy
Enough be prevented effectively from the large-tonnage product defect that half bend pipe 1 occurs in casting process so that the control of the defect rate of product 10% with
Under, achieve significant manufacturing effect.
Concrete analysis is as follows：In the present embodiment, ingate 204 be one along half bend pipe die cavity, 2 side camber bar shaped square
Shape chamber, cross gate 203 are two inclined-planes extended from centre to both sides on half bend pipe die cavity, 2 length direction on the upside of which, horizontal to pour
Road 203 is and the arcwall face coordinated on the upside of ingate 204 to be set by the special construction of ingate 204 and cross gate 203 on the downside of which
Meter, can cause molten iron uniformly gently to flow in half bend pipe die cavity 2, the castability final so as to significantly improve half bend pipe 1,
Avoid large-tonnage product defect；Wherein, the thickness of two sides of half bend pipe 1 is relatively thin, easily occurs after casting herein deforming, and this reality
Half bend pipe 1 manufactured in applying example is used cooperatively with miscellaneous part, therefore the requirement to size is very strict, based on this, this
In embodiment, arranging each ingate 204 includes some sections, fills clay layer, poured due to interior between adjacent two sections of ingates 204
Segmentation structure of the road 204 using interval so that the respective side of two neighboring half bend pipe die cavity 2 is difficult because of ingate 204
Entirety solidifies and micro-strain occurs, so as to greatly improve the dimensional accuracy of the casting of half bend pipe 1；Wherein, cross gate 203 is provided with
To the contraction mouth 2031 of contract, the lateral cross section of the contraction mouth 2031 is zigzag, and contraction mouth 2031 is near cross gate 203
With the connectivity part of ingate 204, the structure setting of above-mentioned contraction mouth 2031 so that molten iron, can be gently in close stream
Half bend pipe die cavity, 2 corresponding side is entered by ingate 204, so that half bend pipe, 1 side edge of casting is difficult to form punching
Sand, it is ensured that its dimensional accuracy；Wherein, the centre on the upside of half bend pipe die cavity 2 is provided with rising head 201, the rising head 201 and half bend pipe die cavity
2 connectivity parts are up big and down small trapezoidal chamber, and by the setting in trapezoidal chamber, molten iron can be efficiently entering on the upside of half bend pipe die cavity 2
Centre, gives full play to the effect of riser feeding, it is to avoid the loose problem of product core.
According to incompletely statistics, the market of domestic and international plumbing installations is more than 100,000,000,000 yuan, and the bend pipe consumption of concrete mixer
Amount also has tens yuan, consumes steel hundreds of thousands ton.The service life (pump concrete amount) of conventional pumps car Technique of High Magnesium Bend Pipe is 1
Incomparably left and right, and adopt half bend pipe 1 that the present embodiment manufactures, its service life verified more than 40,000 sides through actual production, because
This, half bend pipe 1 of the present embodiment manufacture has wide market prospects, while also complying with national energy-saving reduction of discharging, clean and effective, green
The industrial policy of color cycle development.
Below schematically the present invention and embodiments thereof are described, the description does not have restricted, institute in accompanying drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited thereto.So, if the common skill of this area
Art personnel are enlightened by which, in the case of without departing from the invention objective, are designed and the technical scheme without creative
Similar frame mode and embodiment, all should belong to protection scope of the present invention.
Claims (9)
1. a kind of manufacture method of half bend pipe, half bend pipe (1) is the half that a bend pipe is cut vertically, and half bend pipe
(1) it is half of the bend pipe near wrap direction side；Characterized in that, comprising the following steps：
Step A, raw material configuration；
Step B, running gate system make；
Step C, raw material melting；
Step D, moulding by casting；
Step E, heat treatment.
2. the manufacture method of half bend pipe according to claim 1, it is characterised in that：Half bend pipe (1) is designed as from two
A is thickening thickening to middle D with both sides C to middle B at end.
3. the manufacture method of half bend pipe according to claim 2, it is characterised in that：
In step B：By clay make sand mold, the sand mold include several be parallel to each other and horizontal positioned half bent tube type
Chamber (2), structure fabrication of half bend pipe die cavity (2) according to half bend pipe (1), and the opening of the half bend pipe die cavity (2) is equal
Downwards；Same ingate (204) is connected with the respective side of two neighboring half bend pipe die cavity (2), the ingate (204) passes through
Cross gate (203) above which is connected with sprue, and sprue is connected with the cup (202) above which.
4. the manufacture method of half bend pipe according to claim 3, it is characterised in that：The ingate (204) for one along
The bar shaped rectangular cavity of half bend pipe die cavity (2) side camber.
5. the manufacture method of half bend pipe according to claim 4, it is characterised in that：The cross gate (203) on the upside of which is
Two inclined-planes extended from centre to both sides on half bend pipe die cavity (2) length direction, the cross gate (203) on the downside of which be with
The arcwall face coordinated on the upside of the ingate (204).
6. the manufacture method of half bend pipe according to claim 5, it is characterised in that：Each ingate (204) is including some
Section, is filled with clay layer between adjacent two sections of ingates (204).
7. the manufacture method of half bend pipe according to claim 6, it is characterised in that：The cross gate (203) be provided with to
The contraction mouth (2031) of contract, the lateral cross section of the contraction mouth (2031) is zigzag, and contraction mouth (2031) is poured near horizontal
The connectivity part in road (203) and ingate (204).
8. the manufacture method of half bend pipe according to claim 7, it is characterised in that：On the upside of the half bend pipe die cavity (2)
Centre is provided with rising head (201), and the rising head (201) and half bend pipe die cavity (2) connectivity part are up big and down small trapezoidal chamber.
9. the manufacture method of half bend pipe according to claim 1～8 any one, it is characterised in that in step A,
Starting material element includes following by mass percentage：C：3.6-3.8%, Cr：26～28%, Mo：0.3～0.5%, Cu：0.4～
0.5%th, Ni：0.6～0.8%, V：0.3～0.5%, Si, Mn≤0.8%, P, S≤0.04%.
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| CN201611268911.8A CN106513589B (en) | 2016-12-31 | 2016-12-31 | A kind of manufacture method of half bend pipe |
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| CN201611268911.8A CN106513589B (en) | 2016-12-31 | 2016-12-31 | A kind of manufacture method of half bend pipe |
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| CN106513589B CN106513589B (en) | 2018-01-05 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107695304A (en) * | 2017-10-10 | 2018-02-16 | 桐城市文才管业有限公司 | A kind of method for manufacturing bent pipe |
| CN108044050A (en) * | 2017-11-15 | 2018-05-18 | 重庆嘉萌鸿业科技有限公司 | A kind of forming method of automobile water inlet bend pipe |
| CN109648049A (en) * | 2019-01-23 | 2019-04-19 | 马鞍山市海天重工科技发展有限公司 | The manufacturing method of half bend pipe of fibre reinforced |
| CN109676111A (en) * | 2019-01-23 | 2019-04-26 | 马鞍山市海天重工科技发展有限公司 | The running gate system of half bend pipe of fibre reinforced |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107695304A (en) * | 2017-10-10 | 2018-02-16 | 桐城市文才管业有限公司 | A kind of method for manufacturing bent pipe |
| CN108044050A (en) * | 2017-11-15 | 2018-05-18 | 重庆嘉萌鸿业科技有限公司 | A kind of forming method of automobile water inlet bend pipe |
| CN109648049A (en) * | 2019-01-23 | 2019-04-19 | 马鞍山市海天重工科技发展有限公司 | The manufacturing method of half bend pipe of fibre reinforced |
| CN109676111A (en) * | 2019-01-23 | 2019-04-26 | 马鞍山市海天重工科技发展有限公司 | The running gate system of half bend pipe of fibre reinforced |
| CN109648049B (en) * | 2019-01-23 | 2020-05-12 | 马鞍山市海天重工科技发展有限公司 | Manufacturing method of carbon fiber reinforced half-bent pipe |
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