CN105215287A - A kind of valve body evaporative pattern and using method thereof - Google Patents
A kind of valve body evaporative pattern and using method thereof Download PDFInfo
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- CN105215287A CN105215287A CN201510759771.3A CN201510759771A CN105215287A CN 105215287 A CN105215287 A CN 105215287A CN 201510759771 A CN201510759771 A CN 201510759771A CN 105215287 A CN105215287 A CN 105215287A
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Abstract
The invention discloses a kind of valve body evaporative pattern and using method thereof, comprise evaporative pattern, cup and ingate, described evaporative pattern comprises sealing surface and valve seat, ingate is divided into sprue, cross gate, sprue and ingate, the junction of cross gate and sprue is equipped with ingate, described cup is connected with sprue, sprue is connected to the second cross gate, the top of ingate is equipped with sealing surface, and valve body parallels with cross gate, the concrete steps of its using method have 11 operating procedures, have employed the method for valve body being inverted casting, sealing surface in valve body is connected with ingate, the potting syrup setting time at sealing surface position can be postponed, improve the precision of sealing surface, meet important ventricumbent principle in foundry, and yield rate can increase 7-10%, post processing cost lowers 10-30%, bottom there will not be quality problems simultaneously, and material can be saved with artificial.
Description
Technical field
The present invention relates to the casting field of valve body evaporative pattern, particularly a kind of valve body evaporative pattern and using method thereof.
Background technology
Valve body moulding because waist flange has several bolt bag, therefore the lost foam casting of traditional core casting and routine has the shrink defects of part, and this defect could find after processing, both the waste of processing cost had been caused, cause to pay when can make into again appearance batch waste product and delay, even if increase rising head can not guarantee there is no defect completely.
The casting of tradition core, employing horizontal parting is cast, increase a large rising head to avoid shrinking at the flange top of mo(u)ld top half, but this mode product yield is low, and the workload in later stage is also large, cost is high, conventional lost foam casting process, traditional large mouth is convenient to the consolidation that molding sand is filled upward, but adds a very large rising head at bolt platform place, greatly reduces the product yield of foundry goods, meaningless wastes a lot of material and consumes more artificial, when laterally placing, be unfavorable for filling, and filling effect is poor.
Application number is the Chinese invention patent of CN201410455743.8, a kind of brake valve body is cast special evaporative pattern, relate to evaporative pattern technical field, comprise valve gap die body, described valve gap die body upper end is provided with valve rod die body, described valve rod die body left end is left valve seat die body, right-hand member is right valve seat die body, at described valve rod die body, the peak of the upper surface of left valve seat die body and right valve seat die body is equipped with a rising head, an interference rising head is provided with in valve gap die body upper surface middle part, this interference rising head plays interference effect in casting cycle, the time that valve gap die body middle part is solidified is postponed backward, solidify with the position that contacts of valve gap die body with left valve seat die body and right valve seat die body simultaneously, and this interference rising head plays feeding effect simultaneously.The present invention, by increasing by a rising head on valve body evaporative pattern, can play interference and feeding effect, make each position of valve body relative equilibrium in setting time, bulk strength is high, not easy fracture, achieves the technique adopting the mode of evaporative pattern to prepare steel casting, cast(ing) surface is smooth, and cost is low.
Application number is the Chinese invention patent of CN201210224578.6, and relate to a kind of large-scale thin-wall valve body lost foam casting process, it comprises the following steps: (1) send out polystyrene bead in advance; (2) by polystyrene bead slaking; (3) white mold forming; (4) white mould is dried; (5) white die combination; (6) the white mould surface brush lost foam casting fireproof coating will made; (7) the white mould coating coating is dried; (8) bury case jolt ramming; (9) pouring molten iron; (10) unpack again after insulation after cast; (11) clear up unnecessary anti-deformation muscle, smooth with grinder buffing, the thin-walled valve body of system.This technique sets up cross anti-circular hole distortion muscle in flange hole when the white contour forming of valve body, increase white mould rigidity, not yielding, combine bonding rear square hole inner chamber and add T-shaped muscle, I type muscle and diagonal brace, increase square opening anti-deformation muscle outside square opening, effectively overcome the white moding shape after combination.Remove inside and outside anti-deformation muscle when casting cleaning, avoid the distortion of workpiece, reduce percent defective.
Application number is the Chinese invention patent of CN201110278676.3, a method for lost foam casting engine cylinder cover, relates to casting technology field, and described process is, first design the model for the manufacture of the white mould of evaporative pattern with three-dimensional software, and produce corresponding mould; In mould, inject expandability molding bead, after heating, cooling, produce each white mould.And carry out drying; Dried each white mould bonds as a whole on request, and bonding top casting system, obtains lost foam pattern; Drying process is carried out after lost foam pattern surface dip-coating special coating; The lost foam pattern handled well is placed in three-dimensional vibrations sandbox, after injecting dry sand, at surface coverage thin film; In the running gate system of lost foam pattern, inject the solution that melting is handled well, lost foam pattern is melted, space replace by solution, after solution cooled and solidified, unpack take out foundry goods.Invention increases production efficiency, reduce labour, reduce recruitment cost and manufacturing cost.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of valve body evaporative pattern and using method thereof, avoid the mode product yield of contraction low to solve the above-mentioned large rising head that increases at the flange top of mo(u)ld top half caused in prior art, and the workload in later stage is also large, cost is high, conventional lost foam casting process adds a very large rising head at bolt platform place, greatly reduce the product yield of foundry goods, meaningless wastes a lot of material and consumes more artificial, when laterally placing, be unfavorable for filling, and the defect that filling effect is poor.
For achieving the above object, the invention provides following technical scheme: a kind of valve body evaporative pattern, comprise valve body, cup and ingate, described valve body comprises sealing surface and valve seat, valve seat is divided into left valve seat and right valve seat, and the side of valve seat is equipped with bolt platform, be connected by sealing surface between left valve seat with right valve seat, described ingate is divided into sprue, cross gate, sprue and ingate, and sprue divides what be arranged in parallel to be the first sprue and the second sprue, cross gate is divided into the first cross gate be set in parallel between the first sprue and the second sprue, second cross gate and the 3rd cross gate, the junction of cross gate and sprue is equipped with ingate, described cup is connected with sprue, sprue is connected to the second cross gate, the top of ingate is equipped with sealing surface, and valve body parallels with cross gate.
A using method for valve body evaporative pattern, concrete steps comprise:
(1) design for the manufacture of model according to the drawing three-dimensional software of valve body, and utilize cae analysis software to analyze, determine suitable model, and produce corresponding mould;
(2) pre-or expandability polymethylmetacrylate resin bead;
(3) adopt expandability polymethylmetacrylate resin bead to make the white mould of valve body, and dry.
(4) in chamber, white mould side after shaping, sprue is made with expandability polymethylmetacrylate resin bead, cross gate, sprue and ingate, by the first cross gate, second cross gate and the 3rd cross gate difference paralleling binding are between the first sprue and the second sprue, and distance between each cross gate is equal, the junction of each cross gate and sprue all bonds ingate, valve body is inverted in above ingate, namely the top of ingate and sealing surface bonding, and valve body parallels with cross gate, form the valve body evaporative pattern variety of moduli comprising ingate and valve body evaporative pattern and be integrated,
(5) at valve body evaporative pattern variety of moduli surface dip-coating high-leveling coating, coating layer thickness is 0.4-0.5mm;
(6) drying room that the valve body evaporative pattern variety of moduli coating coating is put into dehumidification function is dried, and temperature is controlled at 40-50 DEG C;
(7) dried valve gap evaporative pattern variety of moduli is placed in sandbox, after molding sand is filled to certain altitude, utilizes plain bumper by molding sand jolt ramming, and the jolt ramming time is 30-60 second, phase angle between motor is 0-3 °, and exciting force is 112KN, and vibration acceleration is 1.2g-1.4g;
(8) lay layer of plastic film sealing on sandbox top, and place cup above sprue;
(9) in potting syrup, add ball graphited inoculant, and the temperature of potting syrup is controlled at 1500-1600 DEG C;
(10) in the cup of valve body evaporative pattern variety of moduli, potting syrup is injected, and pressurize 20-30 minute, valve body evaporative pattern variety of moduli is melted, space replace by solution, a small amount of material that valve body evaporative pattern variety of moduli produces is sucked in molding sand by vacuum, and is incubated 40-80 minute;
(11) take out foundry goods, and clear up part, smooth with grinder buffing, namely obtain the valve body moulding of casting by evaporative pattern valve body inversion casting technique.
Preferably, the plain bumper in described step (7) adopts three-point contact type plain bumper.
Preferably, described molding sand adopts 30-50 object nice foundry sand.
Preferably, the diameter of described cup is 50 ㎜.
Preferably, after described step (3), white mould is put into drying room, and dry under temperature being adjusted to the condition of 50 ~ 55 DEG C.
The beneficial effect of above technical scheme is adopted to be: to present invention employs the method that valve body is inverted casting, sealing surface in valve body is connected with ingate, the potting syrup setting time at sealing surface position can be postponed, improve the precision of sealing surface, meet important ventricumbent principle in foundry, avoid the problem that the later stage work amount that uses rising head to avoid occurring in casting process causing when shrinking is large, adopt rational plain bumper, and plain bumper is adjusted to suitable parameter area, ensure enough horizontal filling capacities, avoid the defect occurring the valve body moulding caused because horizontal filling power is not enough, by the method for the cross arrangement of cross gate and sprue, be conducive to cross gate and realize series pouring with being communicated with of sprue, only need inject potting syrup from cast gate, just can carry out one case more than one piece cast, not only poring rate is fast and the temperature of molten iron declines slow, casting quality is good, the percent defective of cast is low, the yield rate adopting evaporative pattern valve body to be inverted casting can increase 7-10%, post processing cost lowers 10-30%, bottom there will not be quality problems simultaneously, and material can be saved with artificial.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is top view of the present invention;
Fig. 3 is the front view of valve body in the present invention;
Wherein, 1-cup, 2-sprue, 3-cross gate, 4-sprue, 5-ingate, 6-valve seat, 7-bolt platform, 8-sealing surface, 31-first cross gate, 32-second cross gate, 33-the 3rd cross gate, 41-first sprue, 42-second sprue, the left valve seat of 61-, the right valve seat of 62-.
Detailed description of the invention
The preferred embodiment of the present invention is described in detail below in conjunction with accompanying drawing 1 to accompanying drawing 3.
Fig. 1 shows the specific embodiment of the present invention: a kind of evaporative pattern valve body, comprise valve body, cup 1 and ingate, described valve body comprises sealing surface 8 and valve seat 6, valve seat 6 is divided into left valve seat 61 and right valve seat 62, and the side of valve seat 6 is equipped with bolt platform 7, be connected by sealing surface 8 between left valve seat 61 with right valve seat 62, described ingate is divided into sprue 2, cross gate 3, sprue 4 and ingate 5, and sprue 4 points be arranged in parallel is the first sprue 41 and the second sprue 42, cross gate 3 is divided into the first cross gate 31 be set in parallel between the first sprue 41 and the second sprue 42, second cross gate 32 and the 3rd cross gate 33, cross gate 3 is equipped with ingate 5 with the junction of sprue 4, described cup 1 is connected with sprue 2, sprue 2 is connected to the second cross gate 32, the top of ingate 5 is equipped with sealing surface 8, and valve body parallels with cross gate 3.
Have employed the method that valve body is inverted casting, sealing surface 8 in valve body is connected with ingate 5, the potting syrup setting time at sealing surface 8 position can be postponed, improve the precision of sealing surface 8, meet important ventricumbent principle in foundry, by the method for the cross arrangement of cross gate 3 and sprue 4, be conducive to cross gate 3 and realize series pouring with being communicated with of sprue 4, only need inject potting syrup from cast gate, just can carry out one case more than one piece cast, not only poring rate is fast and the temperature of molten iron declines slowly, casting quality is good, and the percent defective of cast is low.
Embodiment 1
A using method for valve body evaporative pattern, concrete steps comprise:
(1) design for the manufacture of model according to the drawing three-dimensional software of valve body, and utilize cae analysis software to analyze, determine suitable model, and produce corresponding mould;
(2) pre-or expandability polymethylmetacrylate resin bead;
(3) adopt expandability polymethylmetacrylate resin bead to make the white mould of valve body, and dry.
(4) in chamber, white mould side after shaping, sprue 2 is made with expandability polymethylmetacrylate resin bead, cross gate 3, sprue 4 and ingate 5, by the first cross gate 31, second cross gate 32 and the 3rd cross gate 33 difference paralleling binding are between the first sprue 41 and the second sprue 42, and distance between each cross gate 3 is equal, each cross gate 3 and the junction of sprue 4 all bond ingate 5, valve body is inverted in above ingate 5, namely the top of ingate 5 and sealing surface 8 bonding, and valve body parallels with cross gate 3, form the valve body evaporative pattern variety of moduli comprising ingate and valve body evaporative pattern and be integrated,
(5) at valve body evaporative pattern variety of moduli surface dip-coating high-leveling coating, coating layer thickness is 0.4-0.5mm;
(6) drying room that the valve body evaporative pattern variety of moduli coating coating is put into dehumidification function is dried, and temperature is controlled at 40-50 DEG C;
(7) dried valve gap evaporative pattern variety of moduli is placed in sandbox, after molding sand is filled to certain altitude, utilizes plain bumper by molding sand jolt ramming, and the jolt ramming time is 30-60 second, phase angle between motor is 0-3 °, and exciting force is 112KN, and vibration acceleration is 1.2g-1.4g;
(8) lay layer of plastic film sealing on sandbox top, and place cup 1 above sprue 2;
(9) in potting syrup, add ball graphited inoculant, and the temperature of potting syrup is controlled at 1500-1600 DEG C;
(10) in the cup 1 of valve body evaporative pattern variety of moduli, potting syrup is injected, and pressurize 20-30 minute, valve body evaporative pattern variety of moduli is melted, space replace by solution, a small amount of material that valve body evaporative pattern variety of moduli produces is sucked in molding sand by vacuum, and is incubated 40-80 minute;
(11) take out foundry goods, and clear up part, smooth with grinder buffing, namely obtain the valve body moulding of casting by evaporative pattern valve body inversion casting technique.
In the present invention, the plain bumper in described step (7) adopts three-point contact type plain bumper, and molding sand adopts 30-50 object nice foundry sand, and the diameter of cup 1 is 50 ㎜.
After step (3), white mould is not put into drying room, though drying time is long, but natural air drying not only economize energy, and the cooling velocity of Bai Mo can be made faster.
Embodiment 2
A using method for valve body evaporative pattern, concrete steps comprise:
(1) design for the manufacture of model according to the drawing three-dimensional software of valve body, and utilize cae analysis software to analyze, determine suitable model, and produce corresponding mould;
(2) pre-or expandability polymethylmetacrylate resin bead;
(3) adopt expandability polymethylmetacrylate resin bead to make the white mould of valve body, and white mould is put into drying room, and dry under temperature being adjusted to the condition of 50 ~ 55 DEG C.
(4) in chamber, white mould side after shaping, sprue 2 is made with expandability polymethylmetacrylate resin bead, cross gate 3, sprue 4 and ingate 5, by the first cross gate 31, second cross gate 32 and the 3rd cross gate 33 difference paralleling binding are between the first sprue 41 and the second sprue 42, and distance between each cross gate 3 is equal, each cross gate 3 and the junction of sprue 4 all bond ingate 5, valve body is inverted in above ingate 5, namely the top of ingate 5 and sealing surface 8 bonding, and valve body parallels with cross gate 3, form the valve body evaporative pattern variety of moduli comprising ingate and valve body evaporative pattern and be integrated,
(5) at valve body evaporative pattern variety of moduli surface dip-coating high-leveling coating, coating layer thickness is 0.4-0.5mm;
(6) drying room that the valve body evaporative pattern variety of moduli coating coating is put into dehumidification function is dried, and temperature is controlled at 40-50 DEG C;
(7) dried valve gap evaporative pattern variety of moduli is placed in sandbox, after molding sand is filled to certain altitude, utilizes plain bumper by molding sand jolt ramming, and the jolt ramming time is 30-60 second, phase angle between motor is 0-3 °, and exciting force is 112KN, and vibration acceleration is 1.2g-1.4g;
(8) lay layer of plastic film sealing on sandbox top, and place cup 1 above sprue 2;
(9) in potting syrup, add ball graphited inoculant, and the temperature of potting syrup is controlled at 1500-1600 DEG C;
(10) in the cup 1 of valve body evaporative pattern variety of moduli, potting syrup is injected, and pressurize 20-30 minute, valve body evaporative pattern variety of moduli is melted, space replace by solution, a small amount of material that valve body evaporative pattern variety of moduli produces is sucked in molding sand by vacuum, and is incubated 40-80 minute;
(11) take out foundry goods, and clear up part, smooth with grinder buffing, namely obtain the valve body moulding of casting by evaporative pattern valve body inversion casting technique.
In the present invention, the plain bumper in described step (7) adopts three-point contact type plain bumper, and molding sand adopts 30-50 object nice foundry sand, and the diameter of cup 1 is 50 ㎜.
In the present invention, after described step (3), white mould is put into drying room, and dry under temperature being adjusted to the condition of 50 ~ 55 DEG C, adopting drying room to carry out oven dry can save time, and makes the stability of Bai Mo better.
Have employed the method that valve body is inverted casting, sealing surface 8 in valve body is connected with ingate 5, the potting syrup setting time at sealing surface 8 position can be postponed, improve the precision of sealing surface 8, meet important ventricumbent principle in foundry, avoid the problem that the later stage work amount that uses rising head to avoid occurring in casting process causing when shrinking is large, adopt rational plain bumper, and plain bumper is adjusted to suitable parameter area, ensure enough horizontal filling capacities, avoid the defect occurring the valve body moulding caused because horizontal filling power is not enough, by the method for the cross arrangement of cross gate 3 and sprue 4, be conducive to cross gate 3 and realize series pouring with being communicated with of sprue 4, only need inject potting syrup from cup 1, just can carry out one case more than one piece cast, not only poring rate is fast and the temperature of molten iron declines slow, casting quality is good, the percent defective of cast is low, the yield rate adopting evaporative pattern valve body to be inverted casting can increase 7-10%, post processing cost lowers 10-30%, bottom there will not be quality problems simultaneously, and material can be saved with artificial.
Above-described is only the preferred embodiment of the present invention, it should be pointed out that for the person of ordinary skill of the art, and without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (6)
1. a valve body evaporative pattern, comprise valve body, cup and ingate, it is characterized in that, described valve body comprises sealing surface and valve seat, valve seat is divided into left valve seat and right valve seat, and the side of valve seat is equipped with bolt platform, be connected by sealing surface between left valve seat with right valve seat, described ingate is divided into sprue, cross gate, sprue and ingate, and sprue divides what be arranged in parallel to be the first sprue and the second sprue, cross gate is divided into the first cross gate be set in parallel between the first sprue and the second sprue, second cross gate and the 3rd cross gate, the junction of cross gate and sprue is equipped with ingate, described cup is connected with sprue, sprue is connected to the second cross gate, the top of ingate is equipped with sealing surface, and valve body parallels with cross gate.
2. use a using method for a kind of valve body evaporative pattern described in claim 1, it is characterized in that, concrete steps comprise:
(1) design for the manufacture of model according to the drawing three-dimensional software of valve body, and utilize cae analysis software to analyze, determine suitable model, and produce corresponding mould;
(2) pre-or expandability polymethylmetacrylate resin bead;
(3) adopt expandability polymethylmetacrylate resin bead to make the white mould of valve body, and dry.
(4) in chamber, white mould side after shaping, sprue is made with expandability polymethylmetacrylate resin bead, cross gate, sprue and ingate, by the first cross gate, second cross gate and the 3rd cross gate difference paralleling binding are between the first sprue and the second sprue, and distance between each cross gate is equal, the junction of each cross gate and sprue all bonds ingate, valve body is inverted in above ingate, namely the top of ingate and sealing surface bonding, and valve body parallels with cross gate, form the valve body evaporative pattern variety of moduli comprising ingate and valve body evaporative pattern and be integrated,
(5) at valve body evaporative pattern variety of moduli surface dip-coating high-leveling coating, coating layer thickness is 0.4-0.5mm;
(6) drying room that the valve body evaporative pattern variety of moduli coating coating is put into dehumidification function is dried, and temperature is controlled at 40-50 DEG C;
(7) dried valve gap evaporative pattern variety of moduli is placed in sandbox, after molding sand is filled to certain altitude, utilizes plain bumper by molding sand jolt ramming, and the jolt ramming time is 30-60 second, phase angle between motor is 0-3 °, and exciting force is 112KN, and vibration acceleration is 1.2g-1.4g;
(8) lay layer of plastic film sealing on sandbox top, and place cup above sprue;
(9) in potting syrup, add ball graphited inoculant, and the temperature of potting syrup is controlled at 1500-1600 DEG C;
(10) in the cup of valve body evaporative pattern variety of moduli, potting syrup is injected, and pressurize 20-30 minute, valve body evaporative pattern variety of moduli is melted, space replace by solution, a small amount of material that valve body evaporative pattern variety of moduli produces is sucked in molding sand by vacuum, and is incubated 40-80 minute;
(11) take out foundry goods, and clear up part, smooth with grinder buffing, namely obtain the valve body moulding of casting by evaporative pattern valve body inversion casting technique.
3. a kind of valve body evaporative pattern according to claim 2 and using method thereof, is characterized in that, the plain bumper in described step (7) adopts three-point contact type plain bumper.
4. a kind of valve body evaporative pattern according to claim 2 and using method thereof, is characterized in that, described molding sand adopts 30-50 object nice foundry sand.
5. a kind of valve body evaporative pattern according to claim 2 and using method thereof, is characterized in that, the diameter of described cup is 50 ㎜.
6. a kind of valve body evaporative pattern according to claim 2 and using method thereof, is characterized in that, after described step (3), white mould put into drying room, and dry under temperature being adjusted to the condition of 50 ~ 55 DEG C.
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| CN108311646A (en) * | 2018-04-13 | 2018-07-24 | 芜湖久弘重工股份有限公司 | A kind of large-sized numerical control grinder bed disappearance proplasm preparation method |
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| CN110805720A (en) * | 2019-09-30 | 2020-02-18 | 安徽兰翔重工股份有限公司 | Gate valve body produced in batch by lost foam process and production method thereof |
| CN111570725A (en) * | 2020-05-21 | 2020-08-25 | 争一阀门科技有限公司 | Lost foam valve body casting equipment and casting process thereof |
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| CN108311646A (en) * | 2018-04-13 | 2018-07-24 | 芜湖久弘重工股份有限公司 | A kind of large-sized numerical control grinder bed disappearance proplasm preparation method |
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| CN108655337B (en) * | 2018-05-15 | 2023-11-07 | 芜湖新兴新材料产业园有限公司 | Baffle ring foam plastic model and baffle ring lost foam casting process |
| CN110805720A (en) * | 2019-09-30 | 2020-02-18 | 安徽兰翔重工股份有限公司 | Gate valve body produced in batch by lost foam process and production method thereof |
| CN110805720B (en) * | 2019-09-30 | 2021-08-06 | 安徽兰翔纺机科技有限公司 | Gate valve body produced in batch by lost foam process and production method thereof |
| CN111570725A (en) * | 2020-05-21 | 2020-08-25 | 争一阀门科技有限公司 | Lost foam valve body casting equipment and casting process thereof |
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