CN110076293B - Pouring system for controlling steering gear shell to generate shrinkage porosity and sand washing and process method thereof - Google Patents
Pouring system for controlling steering gear shell to generate shrinkage porosity and sand washing and process method thereof Download PDFInfo
- Publication number
- CN110076293B CN110076293B CN201910336380.9A CN201910336380A CN110076293B CN 110076293 B CN110076293 B CN 110076293B CN 201910336380 A CN201910336380 A CN 201910336380A CN 110076293 B CN110076293 B CN 110076293B
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- riser
- pouring
- molten iron
- pouring system
- flow blocking
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- 239000004576 sand Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005406 washing Methods 0.000 title claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229910052742 iron Inorganic materials 0.000 claims abstract description 37
- 230000000903 blocking effect Effects 0.000 claims abstract description 32
- 238000005266 casting Methods 0.000 claims abstract description 32
- 238000011010 flushing procedure Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 41
- 238000003860 storage Methods 0.000 claims description 13
- 238000001125 extrusion Methods 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 3
- 238000011081 inoculation Methods 0.000 claims 1
- 239000000289 melt material Substances 0.000 claims 1
- 239000002893 slag Substances 0.000 abstract description 3
- 230000003139 buffering effect Effects 0.000 abstract description 2
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003031 feeding effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- 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
- B22C9/086—Filters
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D35/00—Equipment for conveying molten metal into beds or moulds
- B22D35/04—Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D47/00—Casting plants
- B22D47/02—Casting plants for both moulding and casting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to a pouring system for controlling a steering gear shell to generate shrinkage porosity and sand washing and a process method thereof. In order to reduce flushing, the invention adopts the measures of reducing pressure and reducing pressure, the original ingate is directly connected by a thin sheet with the thickness of 3mm, the flow rate of molten iron in the ingate is slowed down, and the primary flow blocking piece and the secondary flow blocking piece arranged in the pouring system can play a role in buffering the molten iron, so that the impact of the molten iron on the interior of the pouring system is reduced, and the situation of sand falling and slag entering is reduced; the inner runner of the invention increases the area, reduces the volume of the riser, and ensures that castings can be sequentially solidified to obtain effective feeding due to the reasonable design of the size of a pouring system.
Description
Technical Field
The invention designs a pouring system for controlling a steering gear shell to generate shrinkage porosity and sand washing and a process method thereof, belonging to the technical field of casting.
Background
When the vertical parting flaskless molding produces a steering gear shell, shrinkage porosity is easy to occur in the casting process, and the shrinkage porosity generally has three reasons, namely, the first casting temperature is improper, shrinkage porosity is easy to occur when the casting temperature is too high, and shrinkage porosity is easy to occur when the casting temperature is too low; secondly, the setting of a pouring system, a riser, a patch and the like is improper, so that the casting cannot be effectively fed when being solidified; the casting structure is unreasonable, the wall thickness changes suddenly, and isolated hot joints cannot be fed; thirdly, the number, the size, the shape and the arrangement positions of the dead heads and the connection of the dead heads and the castings are unreasonable, the feeding effect is poor, and the size or the position of the ingate is improper, so that the castings can not be solidified sequentially;
the vertical parting flaskless molding is different from the previous horizontal parting molding mode, and is mainly characterized by vertical parting and flaskless high-pressure molding, and particularly has higher requirements on molding sand and casting technology. Although some auxiliary equipment and tools are omitted, the height from the highest liquid level of molten iron of the vertical line casting machine to a sand mould is approximately 600-700mm, the height of the sand mould is 530mm, the hydrostatic pressure of the bottom and the top of a casting is different by several times during casting, if pouring channels in all layers are required to fill all cavities layer by layer in a short time (namely, like a stepped casting system), the filling speed of each cavity is too high, and the heating conditions are different from top to bottom, so that the defects of sand flushing, air hole sand sticking (the bottom of the casting) and the like are too many, and the higher the height of the cavity is, the more obvious the defects are. Therefore, all cavities are required to always ensure a constant metal static pressure head in the casting process (namely, the pressure heads of all inner pouring channels are different but not changed in the casting process), so that the flow rates of all the inner pouring channels are equal, and qualified castings with basically consistent quality are obtained.
Disclosure of Invention
The invention provides a pouring system for controlling a steering gear shell to generate shrinkage porosity and sand washing and a process method thereof, aiming at solving the problems of shrinkage porosity and sand falling and slag entering of a riser when the existing vertical parting flaskless molding casting is generated.
The technical scheme of the invention is as follows: the pouring system for controlling the steering gear shell to generate shrinkage porosity and sand washing comprises a pouring system, a vertical parting non-box extrusion molding line and an automatic pouring machine, wherein the pouring system is arranged on the vertical parting non-box extrusion molding line, a liquid injection head is arranged above the pouring system, and the liquid injection head is connected with the automatic pouring machine through a liquid guide pipe;
the pouring system is internally provided with a sprue and a riser respectively, the sprue is connected with the riser through a cross runner, the left side of the riser is provided with a riser, the riser is connected with an inner runner, and the inner runner is communicated with a product cavity;
the feeder head is characterized in that a liquid storage tank is arranged at the top of the feeder head, the cross section of the liquid storage tank is of a structure with a narrow upper part and a wide lower part, a liquid outlet hole is formed in the bottom of the liquid storage tank, a thin sheet with the thickness of 2-4mm is fixedly arranged at the feeder head, a crease is arranged in the middle of the thin sheet, and the thickness of the crease is 1-1.8 mm.
Furthermore, the sprue top is provided with a pouring cup, the top of the riser is provided with a riser cup, and primary choked flow pieces are arranged in the pouring cup and the riser cup.
Further, a secondary choke is arranged in the riser, the secondary choke is positioned at the position of the riser, and the secondary choke
Further, the secondary flow blocking piece comprises a flow blocking plate which is inclined by 45 degrees, a secondary filter screen is fixedly arranged in the middle of the flow blocking plate, and triangular plug connectors are fixedly arranged at the left end and the right end of the flow blocking plate.
Further, the primary flow blocking piece comprises two support plates, the support plates are provided with liquid guide holes, the liquid guide holes are of funnel-shaped structures, and a primary filter screen is fixedly arranged in the liquid guide holes.
Further, the total area of the ingate is larger than the area of the riser, and the width of the riser is smaller than 3 cm.
A pouring process method for controlling a steering gear shell to generate shrinkage porosity and sand washing is characterized by comprising the following steps:
1) And (3) manufacturing a pouring system: and selecting and manufacturing a pouring system of a proper sprue, a runner, a riser, an ingate and a product cavity according to the number of castings, and then installing components such as a primary choke piece, a secondary choke piece, a sheet and the like in the pouring system.
2) Preparing molten iron: the extrusion molding machine is used, a core setting machine is used for setting cores, the design and production efficiency is 400 type/h coreless, 360 type/h core setting is carried out, a newly ground 5T electric furnace melting material is adopted, molten iron after melting is inoculated and poured into an automatic pouring machine, then a liquid injection head of the automatic pouring machine is arranged above a pouring cup, and molten iron is injected into a pouring system at a certain speed.
3) Pouring molten iron: the molten iron firstly passes through the blocking of the primary flow blocking piece, then enters the sprue, the cross runner and the riser in sequence after a certain impact is relieved, then passes through the flow blocking of the secondary flow blocking piece, and then slows down the flow rate of the molten iron again, and then enters the riser, breaks the crease at the middle part of the sheet, enters the inner runner and flows into the product cavity.
4) Cooling and molding: the molten iron cools and contracts in the product cavity, and when the riser contracts, molten iron flowing out of the liquid storage tank at the top of the riser feeds the riser.
In order to reduce flushing, the invention adopts the measures of reducing pressure and reducing pressure, the original ingate is directly connected by a thin sheet with the thickness of 3mm, the flow rate of molten iron in the ingate is slowed down, and the primary flow blocking piece and the secondary flow blocking piece arranged in the pouring system can play a role in buffering the molten iron, so that the impact of the molten iron on the interior of the pouring system is reduced, and the situation of sand falling and slag entering is reduced; the inner runner of the invention increases the area, reduces the volume of the riser, and ensures that castings can be sequentially solidified to obtain effective feeding due to the reasonable design of the size of a pouring system.
Drawings
FIG. 1 is a schematic diagram of a casting system according to the present invention;
FIG. 2 is an enlarged schematic view of part A of the gating system of the present invention;
FIG. 3 is a schematic view of the primary flow-blocking member of the casting system of the present invention;
fig. 4 is a schematic structural view of a vertical parting flaskless extrusion molding line of the present invention.
In the figure: 1. pouring system, 2, riser cup, 3, pouring cup, 4, sprue, 5, runner, 6, riser, 7, runner, 8, product cavity, 9, secondary choked flow piece, 10, choked flow plate, 11, secondary filter screen, 12, thin sheet, 13, liquid storage tank, 14, liquid outlet hole, 15, primary choked flow piece, 16, support plate, 17, liquid guide hole, 18, primary filter screen, 19, vertical parting box-free extrusion molding line, 20, liquid injection head, 21, automatic pouring machine, 22 and riser.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
The pouring system for controlling the steering gear shell to generate shrinkage porosity and sand washing comprises a pouring system 1, a vertical parting box-free extrusion molding line 19 and an automatic pouring machine 21, wherein the pouring system 1 is arranged on the vertical parting box-free extrusion molding line 19, a liquid injection head 20 is arranged above the pouring system 1, and the liquid injection head 20 is connected with the automatic pouring machine 21 through a liquid guide pipe;
the sprue 4 and the riser 6 are respectively arranged in the pouring system 1, the sprue 4 and the riser 6 are connected through a cross runner 5, a riser 22 is arranged on the left side of the riser 6, the riser 22 is connected with an inner runner 7, and the inner runner 7 is communicated with a product cavity 8;
the top of the riser 22 is provided with a liquid storage tank 13, the cross section of the liquid storage tank 13 is of a structure with a narrow upper part and a wide lower part, the bottom of the liquid storage tank 13 is provided with a liquid outlet 14, the riser 22 is fixedly provided with a sheet 12 with the thickness of 2-4mm, the middle part of the sheet 12 is provided with a crease, and the thickness of the crease is 1-1.8 mm.
Further, a pouring cup 3 is arranged at the top of the sprue 4, a riser cup 2 is arranged at the top of the riser 6, and primary choker 15 is arranged in the pouring cup 3 and the riser cup 2.
Further, a secondary choke 9 is arranged in the riser 6, the secondary choke 9 is positioned at the position of the riser 22, and the secondary choke 9
Further, the secondary flow blocking piece 9 comprises a flow blocking plate 10 which is inclined by 45 degrees, a secondary filter screen 11 is fixedly arranged in the middle of the flow blocking plate 10, triangular plug connectors are fixedly arranged at the left end and the right end of the flow blocking plate 10, the flow blocking plate 10 is fixedly plugged into the pouring system through the triangular plug connectors, and impurities in molten iron are secondarily filtered through the secondary filter screen 11.
Further, the primary flow blocking piece 15 includes two support plates 16, the support plates 16 are provided with liquid guiding holes 17, the liquid guiding holes 17 are of a funnel-shaped structure, a primary filter screen 18 is fixedly installed inside the liquid guiding holes 17, and primary filtering is performed on molten iron through the primary filter screen 18.
Furthermore, the total area of the ingate 7 is larger than the area of the riser 6, the width of the riser 6 is smaller than 3 cm, and the casting can be sequentially solidified by adopting reasonable design of the size of a pouring system, so that effective feeding is obtained.
A pouring process method for controlling a steering gear shell to generate shrinkage porosity and sand washing is characterized by comprising the following steps:
1) And (3) manufacturing a pouring system: the pouring system 1 of the sprue 4, the runner 5, the riser 6, the ingate 7 and the product cavity 8 is selected and manufactured according to the number of castings, and then the components such as the primary flow blocking piece 15, the secondary flow blocking piece 9, the thin sheet 12 and the like are arranged in the pouring system 1.
2) Preparing molten iron: the extrusion molding machine is used, a core setting machine is used for setting cores, the design and production efficiency is 400 type/h coreless, 360 type/h core setting is carried out, a newly ground 5T electric furnace melting material is adopted, molten iron after melting is inoculated and poured into the automatic pouring machine 21, then a liquid injection head 20 of the automatic pouring machine 21 is arranged above a pouring cup 3, and molten iron is injected into the pouring system 1 at a certain speed.
3) Pouring molten iron: the molten iron firstly passes through the blocking of the primary flow blocking piece 15, and then enters the sprue 4, the cross runner 5 and the riser 6 in sequence after a certain impact is relieved, then the flow rate of the molten iron is relieved again through the flow blocking of the secondary flow blocking piece 9, then the molten iron enters the riser 22, the crease in the middle of the sheet 12 is broken, the molten iron enters the inner runner 7, and the molten iron flows into the product cavity 8.
4) Cooling and molding: the molten iron cools and contracts in the product cavity 8, and when the riser 22 contracts, molten iron flowing out of the liquid storage tank 13 at the top of the riser 22 feeds the riser.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. The pouring system for controlling the steering gear shell to generate shrinkage porosity and sand washing comprises a pouring system (1), a vertical parting box-free extrusion molding line (19) and an automatic pouring machine (21), and is characterized in that the pouring system (1) is arranged on the vertical parting box-free extrusion molding line (19), a liquid injection head (20) is arranged above the pouring system (1), and the liquid injection head (20) is connected with the automatic pouring machine (21) through a liquid guide pipeline;
the sprue (4) and the riser (6) are respectively arranged in the pouring system (1), the sprue (4) is connected with the riser (6) through a cross runner (5), a riser (22) is arranged on the left side of the riser (6), the riser (22) is connected with an inner runner (7), and the inner runner (7) is communicated with a product cavity (8);
a liquid storage tank (13) is arranged at the top of the riser (22), the cross section of the liquid storage tank (13) is of a structure with a narrow upper part and a wide lower part, a liquid outlet hole (14) is formed in the bottom of the liquid storage tank (13), a sheet (12) with the thickness of 2-4mm is fixedly arranged at the riser (22), a crease is arranged in the middle of the sheet (12), and the thickness of the crease is 1-1.8mm;
the top of the sprue (4) is provided with a pouring cup (3), the top of the riser (6) is provided with a riser cup (2), and primary choked flow pieces (15) are arranged in the pouring cup (3) and the riser cup (2);
a secondary flow blocking piece (9) is arranged in the riser (6), and the secondary flow blocking piece (9) is positioned at the position of the riser (22);
the primary flow blocking piece (15) comprises two support plates (16), liquid guide holes (17) are formed in the support plates (16), the liquid guide holes (17) are of a funnel-shaped structure, and a primary filter screen (18) is fixedly arranged in the liquid guide holes (17).
2. A pouring system for controlling the production of shrinkage porosity and sand flushing of a steering gear housing according to claim 1, characterized in that the total area of the ingate (7) is larger than the area of the riser (6) and the width of the riser (6) is smaller than 3 cm.
3. A casting process method for controlling the steering gear shell to generate shrinkage porosity and sand washing, which adopts the casting system for controlling the steering gear shell to generate shrinkage porosity and sand washing according to any one of claims 1-2, and is characterized by comprising the following steps:
1) And (3) manufacturing a pouring system: a pouring system (1) of a proper sprue (4), a runner (5), a riser (6), an ingate (7) and a product cavity (8) is manufactured according to the number of castings, and then a primary choke piece (15), a secondary choke piece (9) and a sheet (12) are arranged in the pouring system (1);
2) Preparing molten iron: using an extrusion molding machine, using a core setting machine to set cores, designing 400-type/h coreless and 360-type/h core setting, adopting a newly ground 5T electric furnace to melt materials, pouring molten iron after inoculation into an automatic casting machine (21), then placing a liquid injection head (20) of the automatic casting machine (21) above a pouring cup (3), and injecting molten iron into a casting system (1) at a certain speed;
3) Pouring molten iron: the molten iron firstly passes through the blocking of the primary flow blocking piece (15), and then enters the sprue (4), the cross runner (5) and the riser (6) in sequence after a certain impact is relieved, then the flow rate of the molten iron is slowed down again through the flow blocking of the secondary flow blocking piece (9), then the molten iron enters the riser (22), breaks the crease at the middle part of the sheet (12), enters the inner runner (7) and flows into the product cavity (8);
4) Cooling and molding: the molten iron cools and contracts in the product cavity (8), and when the riser (22) contracts, molten iron flowing out of the liquid storage tank (13) at the top of the riser (22) feeds the riser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910336380.9A CN110076293B (en) | 2019-04-25 | 2019-04-25 | Pouring system for controlling steering gear shell to generate shrinkage porosity and sand washing and process method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910336380.9A CN110076293B (en) | 2019-04-25 | 2019-04-25 | Pouring system for controlling steering gear shell to generate shrinkage porosity and sand washing and process method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN110076293A CN110076293A (en) | 2019-08-02 |
| CN110076293B true CN110076293B (en) | 2024-02-27 |
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| CN201910336380.9A Active CN110076293B (en) | 2019-04-25 | 2019-04-25 | Pouring system for controlling steering gear shell to generate shrinkage porosity and sand washing and process method thereof |
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| 高绍君等.《串铸技术及应用》.北京：机械工业出版社,1997,第242-249页. * |
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