CN110614345A - Pulley casting system and casting method thereof - Google Patents
Pulley casting system and casting method thereof Download PDFInfo
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- CN110614345A CN110614345A CN201911034077.XA CN201911034077A CN110614345A CN 110614345 A CN110614345 A CN 110614345A CN 201911034077 A CN201911034077 A CN 201911034077A CN 110614345 A CN110614345 A CN 110614345A
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- 238000005266 casting Methods 0.000 title claims abstract description 153
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000006260 foam Substances 0.000 claims abstract description 66
- 244000035744 Hura crepitans Species 0.000 claims abstract description 22
- 239000003110 molding sand Substances 0.000 claims description 60
- 238000002955 isolation Methods 0.000 claims description 40
- 230000007246 mechanism Effects 0.000 claims description 18
- 238000005086 pumping Methods 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 238000000605 extraction Methods 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000002985 plastic film Substances 0.000 claims description 4
- 229920006255 plastic film Polymers 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 15
- 230000007547 defect Effects 0.000 abstract description 10
- 229910001338 liquidmetal Inorganic materials 0.000 abstract description 7
- 230000006872 improvement Effects 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 35
- 239000010959 steel Substances 0.000 description 35
- 230000008034 disappearance Effects 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 238000011049 filling Methods 0.000 description 7
- 238000000465 moulding Methods 0.000 description 6
- 101100327917 Caenorhabditis elegans chup-1 gene Proteins 0.000 description 4
- 238000010114 lost-foam casting Methods 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 235000002245 Penicillium camembertii Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 208000018999 crinkle Diseases 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
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- 238000005457 optimization Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
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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
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
-
- 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
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/28—Moulds for peculiarly-shaped castings for wheels, rolls, or rollers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a pulley casting system and a casting method thereof, and belongs to the field of casting. The pouring system comprises a pouring cup, a sprue connected with the pouring cup, and a lost foam unit, wherein the lost foam unit comprises cross runners, pulley lost foam and branch runners, the cross runners are arranged in parallel, and the pulley lost foam is fixedly connected between the adjacent cross runners through the branch runners; the sand box unit comprises a hollow box body with an open top, and the evaporative pattern unit is arranged in the sand box unit; and adjacent cross runners of the lost foam units are arranged in an up-down mode, and the end parts of the straight runners are connected to the tops of the cross runners above the straight runners. According to the invention, through improvement of the casting system, the thermal field generated in the casting system is a positive thermal field, the forming rule of liquid metal is better met, the casting system is simplified, the heat loss is less, the casting effect is good, and the defect occurrence rate is greatly reduced.
Description
Technical Field
The invention belongs to the field of casting, and particularly relates to a pulley casting system and a casting method thereof.
Background
The lost foam casting is a casting method that paraffin or foam models with similar size and shape to a casting are bonded and combined into a model cluster, the model cluster is coated with refractory materials and dried, then the model cluster is buried in dry quartz sand for vibration modeling, the model is gasified by pouring under negative pressure, liquid metal occupies the position of the model, and the model cluster is formed after solidification and cooling. The lost foam casting is a new process with near allowance-free and accurate molding, and the process does not need to take a mold, a parting surface or a sand core, so that the casting does not have flash, burrs or draft inclination, and the size error caused by the combination of the core is reduced. The surface roughness of the casting can reach Ra3.2 to 12.5um, the size precision of the casting can reach CT7 to 9, the machining allowance is 1.5 to 2mm at most, the machining cost can be greatly reduced, and compared with the traditional sand casting method, the method can reduce a large amount of machining time.
The casting produced by the existing lost foam casting system has the problems of crinkle, sand adhesion, air holes and the like on the surface of the casting, and the yield of the casting is influenced, so that a large amount of steel scraps are produced, and the production cost is increased unnecessarily.
Through retrieval, the Chinese patent publication number: CN 101941056A; the publication date is as follows: 2011, 1 month, 12 days; the utility model discloses a vertical casting system, including the base, there is the curb plate around the peripheral fixed mounting of base, and the suit case is enclosed together to base and curb plate, is equipped with several horizontal pouring passageways in the base, is equipped with vertical casting passageway in the curb plate, and the bottom of vertical casting passageway is equipped with the filter screen, and the one end of several horizontal pouring passageways converges in one and is linked together with vertical pouring passageway, is equipped with casting channel in the several in the bottom surface to be linked together respectively with the horizontal pouring passageway of several. Although the application reduces the probability of occurrence of some casting defects, the casting system has a complex structure, the heat loss is large in the casting process, and the casting yield is still influenced due to the inversion of a thermal field in the casting process.
Disclosure of Invention
1. Problems to be solved
The pulley casting system and the casting method thereof have the advantages that through improvement of the casting system, a thermal field generated in the casting system is a positive thermal field, the casting system is more in line with the forming rule of liquid metal, the casting system is simplified, the heat loss is less, the casting effect is good, and the defect occurrence rate is greatly reduced.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A pulley casting pouring system comprises a pouring cup, a sprue connected with the pouring cup and a runner,
the device comprises a lost foam unit, a pulley lost foam unit and a plurality of branch runners, wherein the cross runners are arranged in parallel, and the pulley lost foam unit is fixedly connected between the adjacent cross runners through the branch runners;
the sand box unit comprises a hollow box body with an open top, and the evaporative pattern unit is arranged in the sand box unit;
and adjacent cross runners of the lost foam units are arranged in an up-down mode, and the end parts of the straight runners are connected to the tops of the cross runners above the straight runners.
One end of the sprue is connected with the sprue cup, the other end of the sprue is connected with the lost foam unit, the sand box unit is used for placing the lost foam unit and molding sand, after the molding sand is filled in the sand box unit, a space matched with the shape of the lost foam unit is formed under the support of the lost foam unit, after molten steel is cast, the lost foam unit is gasified and lost at high temperature of the molten steel, and finally forms the shape to be cast, the lost foam unit of the scheme comprises two cross runners which are parallel to each other, a plurality of pulley lost foam with the same shape as a pulley casting and branch runners which are connected with the pulley lost foam and the cross runners, the cross runners are in a strip shape, the pulley lost foam is arranged between the two cross runners which are parallel to each other, the branch runners are respectively connected with the pulley lost foam and the cross runners at two ends of the pulley lost foam, during casting, the two cross runners of the lost foam unit are arranged in an up-and down mode, and the end part, therefore, molten steel during casting is poured from the top, flows through the upper cross gate, then flows through the pulley evanescent mode along the branch gate, is collected at the lower cross gate, and under the principle of a communicating vessel, the liquid level of the molten steel rises along with the casting, and is continuously filled with the pulley evanescent modes, and finally the casting molding is carried out.
Furthermore, a depression is formed in the middle of one end, connected with the pulley lost foam, of the branch pouring channel.
Divide the middle part of watering and the continuous one end of pulley disappearance mould to be equipped with sunkenly, when avoiding casting, the molten steel that gushes suddenly directly falls on the pulley disappearance mould behind the gasification disappearance mould impact the shape that the wall influences the casting foundry goods, through being equipped with middle part sunk structure, shunts the molten steel that gushes to reduce the molten steel flow through the impact force of dividing after watering, the casting effect when further guaranteeing pulley part casting.
Furthermore, the wall surface of the recess is a curved surface.
The shape design of sunken wall is the curved surface, and the sunken wall shape of curved surface also forms corresponding molding sand curved surface shape in the department of filling after filling the molding sand, and when the molten steel was gushed like this, the molding sand structure of curved surface shape can be better alleviate stress, prevents that this department structure from being eroded and damaged, and then keeps the whole reposition of redundant personnel buffering effect of the molten steel of sunk structure casting to the pulley disappearance mould that flows in, further guarantees the casting effect.
Further, the flask unit includes:
the box body is a hollow box body with an opening at the top;
the air pumping port is a through hole formed in the side surface of the box body;
and the isolation mechanism is arranged on one side of the extraction opening and used for isolating the molding sand in the box body during casting.
When the sand box unit uses, add disappearance mould unit and molding sand in the box, then take out the negative pressure operation through the extraction opening to the box, set up isolation mechanism in extraction opening one side and prevent that the molding sand from flowing from the extraction opening, also prevent that the molding sand from being taken out and blockking up air extraction equipment, isolation mechanism's structure has a lot of, like gauze, filter cloth, baffle etc..
Further, the isolation mechanism comprises an isolation plate, a filter screen and a pressure equalizing groove;
through holes are uniformly formed in the isolation plate;
the filter screen is laid on the side surface of the isolation plate;
the isolation plate is detachably connected with the inner wall surface of the box body;
the inner wall surface of the box body is provided with a pressure equalizing groove, so that a space is reserved between the filter screen and the inner wall surface of the box body.
The division board is the steel sheet in this scheme, evenly set up the through-hole on the division board, the filter screen is the gauze, lay the side at the division board, can dismantle with division board and box inner wall and be connected, this scheme passes through bolted connection's mode and realizes, the pressure-equalizing groove has been seted up to the box inner wall part of being connected with the division board, for groove structure, through the pressure-equalizing groove, lay and leave the interval between the filter screen on the division board and the internal face of box, when taking out the negative pressure operation, the division board of stereoplasm plays the supporting role to the molding sand in the box, the air in the box sees through the through-hole on the division board and the mesh on the filter screen enters into the space in pressure-equalizing groove, finally taken out from the extraction opening by.
A pulley casting method comprises the following steps:
firstly, coating: coating a coating on the surface of the lost foam unit, and then drying;
secondly, modeling: placing the sprue and the lost foam unit in the middle of the box body of the sand box unit, injecting molding sand into the box body, compacting and flattening the molding sand, injecting the molding sand into the sprue, exposing the sprue cup outside the molding sand, and paving a plastic film on the surface of the molding sand;
thirdly, negative pressure pumping: pumping the box body of the sand box unit into negative pressure through the air pumping hole;
fourthly, casting;
fifthly, recycling the molding sand;
sixthly, cleaning the casting.
Further, during modeling, the sprue is vertically placed in the box body.
Further, when negative pressure is pumped out, the pressure value in the box body is controlled to be 0.030-0.040 MPa.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the pulley casting system, the thermal field generated in the casting system is a forward thermal field, the upper temperature is high, the lower temperature is low, and the pulley casting system is different from a reversed thermal field which is generated in the traditional casting process and has the lower temperature higher than the upper temperature, so that the thermal field generated by the casting system disclosed by the invention is more in line with the forming rule of liquid metal, the casting system is simplified, the heat loss is less, the casting effect is good, and the defect occurrence rate is greatly reduced;
(2) according to the pulley casting system, the middle concave structure is arranged, so that the poured molten steel is divided, the impact force of the molten steel flowing through the branch pouring channel is reduced, and the casting effect of the pulley during partial casting is further ensured;
(3) according to the pulley casting system, the shape of the concave wall surface is designed to be the curved surface, and the filling position of the concave wall surface of the curved surface also forms the curved surface shape of the corresponding molding sand after the molding sand is filled, so that when molten steel is poured in, the curved surface-shaped molding sand structure can better relieve stress, prevent the structure from being eroded and damaged, further keep the shunting buffering effect of the whole casting process of the concave structure on the molten steel flowing into the pulley lost foam, and further guarantee the casting effect;
(4) according to the pulley casting system, the isolation mechanism is arranged on one side of the air pumping hole to prevent molding sand from flowing out of the air pumping hole and prevent the molding sand from being pumped out to block air pumping equipment;
(5) according to the pulley casting system, the isolation mechanism is composed of the isolation plate, the filter screen and the pressure equalizing groove, and through the structure, the pressure in the box body is uniform in negative pressure operation in the casting process, and the uniform filling effect of molding sand on a lost foam unit is ensured;
(6) the pulley casting method provided by the invention is simple to operate, the casting process is convenient and easy to implement, the casting yield is high, and the one-time qualification rate of casting products reaches more than 99%.
Drawings
FIG. 1 is a schematic view showing the construction of a flask unit of the present invention;
FIG. 2 is a schematic view showing the construction of a flask unit of the present invention;
FIG. 3 is a schematic view showing the construction of a flask unit of example 5;
FIG. 4 is a schematic structural diagram of a lost foam unit according to the present invention;
FIG. 5 is an enlarged view of A in FIG. 4;
fig. 6 is a schematic view of a placing method of the lost foam unit of embodiment 7;
FIG. 7 is a schematic structural diagram of a wheel change casting gating system of the present invention.
In the figure:
1. a pouring cup;
2. a sprue;
3. a lost foam unit; 30. a cross gate; 31. a pulley lost foam; 32. dividing a pouring channel; 320. recessing;
4. a flask unit; 40. a box body; 41. an isolation mechanism; 410. a separator plate; 411. filtering with a screen; 412. a pressure equalizing groove; 42. an air extraction opening; 43. a trunnion.
Detailed Description
The invention is further described with reference to specific embodiments and the accompanying drawings.
Example 1
As shown in fig. 7 and 4, the pulley casting pouring system comprises a pouring cup 1, a sprue 2 connected with the pouring cup 1, and a runner,
the lost foam unit 3 comprises cross runners 30, pulley lost foam 31 and branch runners 32, wherein the cross runners 30 are arranged in parallel, and the pulley lost foam 31 is fixedly connected between the adjacent cross runners 30 through the branch runners 32;
a flask unit 4 including a hollow box body having an open top, the lost foam unit 3 being placed in the flask unit 4;
the adjacent runners 30 of the lost foam unit 3 are arranged in an up-and-down manner, and the ends of the sprue 2 are connected to the tops of the runners 30 located above.
When the lost foam is cast, liquid metal is directly poured on a white mold coated with refractory materials, the mold sample is buried in sandy soil compacted by negative pressure, finally, molten metal replaces the white mold by thermal degradation and solidifies to generate a casting, the problems of wrinkled skin, bonded sand, air holes and the like easily appear on the surface of the casting in the existing casting lost foam casting system, through research and analysis of an applicant, the main reason of the defect is that the heat loss is more in the casting process under the condition of normal casting operation, complex lost foam units and various runners are designed in some existing pulley casting systems to cause the heat loss in the casting process to be larger, the final product is easy to have defects, and some casting systems which are simple in appearance form a thermal field which does not accord with the forming rule due to unreasonable distribution of the runners, so that the casting effect is influenced, resulting in defects.
In the pulley casting pouring system of this embodiment, the sprue cup 1 and the sprue 2 are common components in the existing pouring system, one end of the sprue 2 is connected with the sprue cup 1, the other end of the sprue 2 is connected with the evaporative pattern unit 3, the sand box unit 4 is used for placing the evaporative pattern unit 3 and molding sand, after the sand box unit 4 is filled with the molding sand, a space with a shape matching with that of the evaporative pattern unit 3 is formed under the support of the evaporative pattern unit 3, after the molten steel is poured, the evaporative pattern unit 3 is gasified and disappeared at high temperature of the molten steel, the space filled with the molten steel finally forms a shape to be poured, the evaporative pattern unit 3 of this embodiment is composed of two parallel runners 30, a plurality of pulley evaporative patterns 31 with the same shape as the pulley casting, and a branch runner 32 connecting the pulley evaporative patterns 31 and the runners 30, the runners 30 are strip-shaped, the evaporative patterns 31 are arranged between the two parallel runners 30, the branch runners 32 connect the pulley lost foam 31 with the cross runners 30 at two ends of the pulley lost foam 31 respectively, the lost foam unit 3 of the embodiment has simple structure and no complicated runner branch, the pulley lost foam 31 is equivalent to a cavity during casting, and can also play the role of branch runner for branch flow guide during casting, furthermore, in the casting system of the embodiment, the two cross runners 30 of the lost foam unit 3 are arranged oppositely in an up-down mode during casting, the end part of the sprue 2 is connected with the top part of the cross runner 30 at the upper part, therefore, molten steel during casting is poured in from the top part, flows through the cross runner 30 at the upper part, then flows through the pulley lost foam 31 along the branch runners 32, and is collected at the cross runner 30 at the lower part, under the principle of communicating vessel, the pulley lost foam 31 is not filled up along with the rising of the liquid level of the molten steel during casting, the final casting molding is realized, and the whole casting system is very simplified, the heat loss is few, and the molten steel can not directly produce the impact to pulley disappearance mould 31, because the molten steel is left from the top earlier, rise from the below again and fill the type, the thermal field that produces in the casting system is forward thermal field, and upper portion temperature is high, and lower part temperature is low, and the high low heat field that reverses of upper portion temperature of lower part temperature that produces when being different from traditional casting, the thermal field that the casting system of this application produced more accords with the shaping law of liquid metal, and the casting system simplification, and calorific loss is few, therefore the casting is effectual, defect incidence greatly reduced.
Further, a plurality of pulley evanescent mode 31 are arranged in the group of evanescent mode units 3 of the embodiment, the pulley evanescent modes 31 are arranged in parallel, and the distance between the adjacent pulley evanescent modes 31 is 6-9 mm. The distance is less than 6mm, the mutual influence between the lost foam 31 of each pulley in the casting process influences the casting effect, the distance is greater than 9mm, the space is wasted, and further the 30 overlength of the transverse pouring gate can be caused, and the casting is influenced.
Example 2
As shown in fig. 4, the pulley casting gating system of the present embodiment is further improved from embodiment 1 in that a recess 320 is provided in the middle of the end of the branch gate 32 connected to the pulley evaporative die 31.
The pulley casting system of this embodiment, the middle part of the one end that divides to water 32 and pulley disappearance mould 31 and link to each other is equipped with sunken 320, when avoiding casting, and the molten steel that gushes suddenly directly falls on pulley disappearance mould 31 and strikes the shape that the wall influences the casting foundry goods behind the gasification disappearance mould, through being equipped with the sunken 320 structure in middle part, shunts the molten steel that gushes into to reduce the molten steel flow and flow through the impact force of dividing behind the water 32, casting effect when further guaranteeing pulley part casting.
Further, in this embodiment, the sprue 2 is not directly opposite to the branch gate 32 in the vertical direction, that is, the corresponding runner 30 in the vertical direction of the sprue 2 is not connected with the branch gate 32, so as to prevent the molten steel from directly falling into the pulley lost foam 31 after gasifying the branch gate 32 and impacting the pulley casting forming structure to cause the casting defect.
Example 3
As shown in fig. 5, the pulley casting gating system of the present embodiment is further improved on the basis of embodiments 1 and 2, and the wall surface of the recess 320 is a curved surface.
This embodiment is as the further optimization to embodiment 2, is the curved surface with the shape design of sunken 320 wall, and the sunken 320 wall shape of curved surface is after filling the molding sand, and corresponding molding sand curved surface shape is also formed in the department of filling, and when the molten steel was gushed like this, the molding sand structure of curved surface shape can be better alleviate stress, prevent that this department structure from being eroded and damaged, and then keep sunken 320 structure casting whole journey to the reposition of redundant personnel buffering effect of the molten steel that flows in pulley disappearance mould 31, further guarantee the casting effect.
Example 4
As shown in fig. 1 and 2, the pulley casting gating system of the present embodiment is further improved on the basis of embodiments 1 to 3, and the sand box unit 4 includes:
a box body 40 which is a hollow box body with an open top;
an air suction port 42 which is a through hole opened in the side surface of the case 40;
and an isolation mechanism 41 disposed on the side of the suction opening 42 for isolating the molding sand placed in the box 40 during casting from the box 40.
When the sand box unit 4 of this embodiment is used, add lost foam unit 3 and molding sand in box 40, then take out the negative pressure operation through extraction opening 42 to box 40, set up isolation mechanism 41 in extraction opening 42 one side and prevent that the molding sand from flowing out from extraction opening 42, also prevent that the molding sand from being taken out and blockking up air exhaust equipment, isolation mechanism 41's structure has a lot of, like gauze, filter cloth, baffle etc.
Example 5
As shown in fig. 3, the pulley casting gating system of the present embodiment is further improved on the basis of embodiments 1 to 4, and the isolation mechanism 41 includes an isolation plate 410, a filter screen 411, and a pressure equalizing groove 412;
through holes are uniformly formed in the isolation plate 410;
the filter screen 411 is laid on the side surface of the isolation plate 410;
the isolation plate 410 is detachably connected with the inner wall surface of the box body 40;
the inner wall of the box 4 is provided with a pressure equalizing groove 412, so that a distance is reserved between the filter 411 and the inner wall of the box 4.
The structure of the isolation mechanism 41 is optimized in this embodiment, the isolation mechanism 41 of this embodiment is composed of three parts, the isolation plate 410 is a hard plate, in this embodiment, it is a steel plate, through holes are uniformly formed on the isolation plate 410, the filter screen 411 is a gauze, and is laid on the side surface of the isolation plate 410, the isolation plate 410 is detachably connected with the inner wall surface of the box 40, this embodiment is realized by a bolt connection manner, the inner wall surface part of the box 40 connected with the isolation plate 410 is provided with a pressure equalizing groove 412, which is a groove structure, a space is left between the filter screen 411 laid on the isolation plate 410 and the inner wall surface of the box 4 through the pressure equalizing groove 412, when the negative pressure pumping operation is performed, the hard isolation plate 410 plays a supporting role for the molding sand in the box 40, the air in the box 40 enters the space of the pressure equalizing groove 412 through the through holes on the isolation plate 410 and the meshes on the filter screen 411, and is, because of the existence of the pressure equalizing groove 412 and the isolation plate 410, the pumping hole 42 is not compacted by the molding sand, only local negative pressure in the box body 40 reaches the standard, and the condition of uneven overall negative pressure occurs.
In the existing casting system, in the negative pressure operation, the condition of uneven pressure in the box 40 exists, the analysis reason is that the molding sand is accumulated at the air exhaust port to be blocked, so that the air exhaust operation is difficult to continue, finally, the local negative pressure reaches the standard, most of the pressure in the box 40 does not reach the standard, most of the lost foam is not compacted by the molding sand, and after the molten steel is cast, the part which is not compacted by the molding sand is deformed and the like during the filling of the molten steel, so that the defect of low casting yield is caused, therefore, the improvement of the embodiment is necessary for improving the casting effect, through the isolation mechanism 41 of the embodiment, the negative pressure can be uniformly pumped in the box 40 in the air exhaust operation, the pressure in the box 40 is ensured to be uniform, further, the size of one isolation mechanism 41 accounts for more than 60% of the area of one inner side surface of the box 40, the pressure in the whole box is further ensured to, an isolation mechanism 41 is provided to further improve the efficiency of the negative pressure pumping operation and the uniformity of the pressure.
Example 6
The pulley casting method comprises the following steps:
firstly, coating: coating a coating on the surface of the lost foam unit 3, and then drying;
secondly, modeling: placing a sprue 2 and a lost foam unit 3 in the middle of a box body 40 of a sand box unit 4, injecting molding sand into the box body 40, compacting and flattening the molding sand, injecting the molding sand into the sprue 2, exposing a sprue cup 1 out of the molding sand, and paving a plastic film on the surface of the molding sand;
thirdly, negative pressure pumping: the interior of the box body 40 of the sand box unit 4 is pumped into negative pressure through an air pumping hole 42;
fourthly, casting;
fifthly, recycling the molding sand;
sixthly, cleaning the casting.
In the embodiment, the lost foam unit 3 is brushed once with coating with the thickness of 2-3 mm on all surfaces by using a writing brush, the coating is dried, then the lost foam unit 3 is bound on a fixing frame and is put into a coating pool, the coating pool is taken out and dried after being immersed, then a layer of molding sand is paved at the bottom of a sand box, a three-dimensional compaction platform is used for compacting and leveling by vibration, the lost foam unit 3 is put into the middle part of a box body 40, two runners 30 in the lost foam unit 3 are arranged in an up-and-down opposite mode, a sprue 2 is connected with the top surface of the upper runner 30, the molding sand is continuously added, the molding sand is added and vibrated while being added until the molding sand is 10-20 mm away from the upper opening of the sand box, at the moment, the molding sand does not pass through the sprue 2, a sprue cup 1 is partially exposed out of the molding sand, a plastic film is paved on the top of the molding sand, the cup opening of the sprue cup, and after the casting is finished, pouring out the molding sand, taking out the casting, recycling the molding sand, continuing to cast next time, and cleaning the taken-out casting.
The casting process of the embodiment is convenient and easy to implement, the yield of the casting is high, and the one-time qualified rate of the casting product reaches more than 99%.
Example 7
The pulley casting method of the embodiment is further improved on the basis of the embodiment 6, and during modeling, the sprue 2 is vertically placed in the box body 40, as shown in fig. 6.
When in molding, the sprue 2 is vertically placed in the box body 40, the transverse runner 30 in the lost foam unit 3 connected with the sprue 2 is arranged in the sand box in an up-down opposite mode, when in casting, molten steel flows through the sprue cup and the sprue 2, flows through the transverse runner 30 above, then flows through the pulley lost foam 31 along the branch runner 32, is collected at the transverse runner 30 below, and under the principle of a communicating device, the molten steel level rises along with the casting to continuously fill all the pulley lost foam 31, and finally the casting molding is carried out, the whole casting system is very simplified, the heat loss is less, the molten steel can not directly impact the pulley lost foam 31, because the molten steel is firstly left from the top and then rises from the bottom to fill, a thermal field generated in the casting system is a forward thermal field, the upper temperature is high, the lower temperature is low, and is different from a thermal field generated in the traditional casting process that the lower temperature is higher than the upper temperature is low, the thermal field generated in the casting mode of the application is more accordant with the molding rule of liquid metal, the casting yield is improved.
Example 8
The pulley casting method of the embodiment is further improved on the basis of the embodiments 6 and 7, and the pressure value in the box body 40 is controlled to be 0.030-0.040 MPa when negative pressure is pumped.
The pressure value in the negative pressure operation control box body 40 is 0.030-0.040 MPa, when the pressure is less than 0.030MPa, the pressure of the molding sand on the evaporative pattern unit 3 is too large, the structure of the evaporative pattern unit 3 is easily damaged by extrusion, particularly, the connection part of the branch pouring gate 32 and the pulley evaporative pattern 31 is connected, when the pressure value is more than 0.040MPa, the pressure of the molding sand on the evaporative pattern unit 3 is insufficient, and the casting effect is influenced by the condition that the pulley casting is easy to form after casting.
The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A pulley casting pouring system comprises a pouring cup (1) and a sprue (2) connected with the pouring cup (1), and is characterized by also comprising,
the lost foam unit (3) comprises cross runners (30), pulley lost foam (31) and branch runners (32), the cross runners (30) are arranged in parallel, and the pulley lost foam (31) is fixedly connected between the adjacent cross runners (30) through the branch runners (32);
a sand box unit (4) which comprises a hollow box body with an open top, wherein the lost foam unit (3) is arranged in the sand box unit (4);
the adjacent cross runners (30) of the lost foam unit (3) are arranged in an up-and-down mode, and the end part of the sprue (2) is connected to the top of the cross runner (30) located above.
2. The pulley casting gating system of claim 1, wherein: a concave (320) is arranged in the middle of one end of the branch pouring channel (32) connected with the pulley evanescent mode (31).
3. The pulley casting gating system of claim 2, wherein: the wall surface of the recess (320) is a curved surface.
4. A pulley casting gating system according to any one of claims 1 to 3, wherein the flask unit (4) comprises:
a box body (40) which is a hollow box body with an open top;
the air extraction opening (42) is a through hole formed in the side surface of the box body (40);
and an isolation mechanism (41) which is arranged on one side of the extraction opening (42) and is used for isolating the molding sand placed in the box body (40) during casting.
5. A pulley casting gating system according to claim 4, wherein the isolation mechanism (41) comprises an isolation plate (410), a screen (411) and a pressure equalizing groove (412);
through holes are uniformly formed in the isolation plate (410);
the filter screen (411) is laid on the side surface of the isolation plate (410);
the isolation plate (410) is detachably connected with the inner wall surface of the box body (40);
the inner wall surface of the box body (4) is provided with a pressure equalizing groove (412), so that a space is reserved between the filter screen (411) and the inner wall surface of the box body (4).
6. The pulley casting method is characterized by comprising the following steps:
firstly, coating: coating paint on the surface of the lost foam unit (3), and then drying;
secondly, modeling: placing the sprue (2) and the lost foam unit (3) in the middle of the box body (40) of the sand box unit (4), injecting molding sand into the box body (40), compacting and flattening the molding sand, injecting the molding sand into the sprue (2), exposing the sprue cup (1) out of the molding sand, and paving a plastic film on the surface of the molding sand;
thirdly, negative pressure pumping: the interior of the box body (40) of the sand box unit (4) is pumped into negative pressure through an air pumping hole (42);
fourthly, casting;
fifthly, recycling the molding sand;
sixthly, cleaning the casting.
7. The pulley casting method according to claim 6, wherein: during modeling, the sprue (2) is vertically placed into the box body (40).
8. The pulley casting method according to claim 7, wherein: when negative pressure is pumped, the pressure value in the box body (40) is controlled to be 0.030-0.040 MPa.
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| CN201911034077.XA CN110614345A (en) | 2019-10-29 | 2019-10-29 | Pulley casting system and casting method thereof |
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| CN201911034077.XA CN110614345A (en) | 2019-10-29 | 2019-10-29 | Pulley casting system and casting method thereof |
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| CN112191804A (en) * | 2020-10-20 | 2021-01-08 | 含山县港鉴峰铸造厂(普通合伙) | Handheld lost foam casting auxiliary equipment and casting method |
| CN114618992A (en) * | 2022-03-18 | 2022-06-14 | 宁夏苏宁新能源设备有限公司 | Raise boring machine box casting system |
| CN114618992B (en) * | 2022-03-18 | 2024-06-28 | 宁夏苏宁新能源设备有限公司 | Casing casting system of well-reversing drill box |
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