CN113579168A - Gravity casting process for oil cylinder and gear and rack cavity integrated hydraulic steering engine long shell - Google Patents
Gravity casting process for oil cylinder and gear and rack cavity integrated hydraulic steering engine long shell Download PDFInfo
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- 238000005266 casting Methods 0.000 title claims abstract description 56
- 230000005484 gravity Effects 0.000 title claims abstract description 27
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 102
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 102
- 238000003754 machining Methods 0.000 claims abstract description 15
- 239000004576 sand Substances 0.000 claims abstract description 13
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 29
- 239000004411 aluminium Substances 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 30
- 230000008569 process Effects 0.000 abstract description 28
- 230000002457 bidirectional effect Effects 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000004512 die casting Methods 0.000 description 5
- 238000012356 Product development Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 244000145845 chattering Species 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003031 feeding effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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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
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- 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
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Abstract
The invention belongs to the technical field of gravity casting of long casings of steering machines, and particularly relates to a gravity casting process of a long casing of a hydraulic steering machine integrating an oil cylinder and a rack cavity, which comprises a mould, wherein the mould is in an integrated structure of the oil cylinder cavity, the rack cavity and a gear cavity, one end of the mould is provided with a first aluminum inlet, the other end of the mould is provided with a second aluminum inlet, and the mould is provided with an exhaust port and a central dead head, and further comprises the following steps: cleaning residual sand, opening a mould, and putting the combined sand core; the blank produced by the process disclosed by the invention does not need to be subjected to rough machining, the blank weight of a product is reduced, the original process is simplified, the problem of overlarge wall thickness caused by core pulling is solved, the quality of the product is improved, meanwhile, the internal shrinkage porosity defect of a casting is greatly reduced, the product percent of pass is greatly improved, the gas content of the internal structure of the product is extremely reduced through the design of bidirectional aluminum feeding, the problem of air holes and pinholes in the product is solved, and the product quality is improved.
Description
Technical Field
The invention relates to the technical field of gravity casting of a long shell of a steering engine, in particular to a gravity casting process of a long shell of a hydraulic steering engine integrating an oil cylinder and a gear rack cavity.
Background
The production of aluminum alloy parts by casting is generally known in the art and is widely used in the alloy forming process. There are generally three common ways, one by one, described below:
the first aluminum alloy die casting process has become one of the most widely used processes in alloy forming processes. The process completely adopts a metal cavity, and when pouring, aluminum liquid is injected into the cavity by applying certain pressure to produce a casting. The casting produced by the die casting process has high surface precision, and the requirements on the material and the processing precision of the die casting die are higher, so the manufacturing period of the die is longer. Particularly, in the product development stage, the structure of the product may be changed continuously, and the die-casting mold is not easy to change and is not suitable for structure adjustment in the product development stage. In addition, the die casting equipment has high cost, and the investment risk is high for product development.
The second sand core molding process is also commonly used for automobile cylinder bodies, and is characterized in that a plurality of sand cores are combined together through a core assembly fixture, and then molten aluminum is poured into a cavity formed by the sand cores to produce a casting. The sand core molding process is also a gravity casting process, and all shapes of castings are formed by sand cores, so that the number of the needed sand cores is large, a certain number of core boxes need to be manufactured, the tooling investment cost is high, and the period is long. During casting, as the sand cores are arranged around the aluminum liquid and the heat dissipation of the sand cores is slow, the solidification time of the aluminum liquid is longer, the temperature is not easy to control, and the problem of local places needing special control is not easy to solve. The casting produced by the sand core molding process has higher surface roughness.
The third metal mold gravity casting process is a combination of metal mold and sand core and features less technological steps, short mold making period and low development cost. And the gravity metal mold casting mold can adapt to the continuous adjustment in the product development stage, but the common metal mold gravity casting process has the process difficulties of the common metal mold gravity casting mold and cannot be adopted by people, such as feeding problem, mold filling problem and molten aluminum cooling problem.
The existing oil cylinder and rack inner cavities adopt a steel core pulling process, a gear cavity is used as a casting channel and is cast in a solid mode, then rough machining of the oil cylinder cavity and the rack cavity caused by the core pulling process is carried out through a boring machine, meanwhile, the solid gear cavity arranged as the casting channel needs to be machined, the process is original, the amount of aluminum used for products is large, the energy consumption is high, the rough machining time is long, the amount of aluminum scraps is large, the aluminum loss is large, and the residual finish machining allowance is still larger by 3-4mm due to the cutter chattering factor existing in rough machining. Moreover, the blank weight of the product is large, and meanwhile, due to the problem of overlarge wall thickness caused by core pulling, a lot of poor shrinkage porosity conditions occur inside the casting, the product percent of pass is low, and meanwhile, the gas content of the internal structure of the product causes a lot of gas holes in the product, so that the production quality is greatly influenced.
In order to solve the problems, the application provides a gravity casting process for a long shell of an oil cylinder and gear and rack cavity integrated hydraulic steering engine.
Disclosure of Invention
Objects of the invention
In order to solve the technical problems in the background art, the invention provides a gravity casting process for a long shell of an oil cylinder and gear and rack cavity integrated hydraulic steering engine.
(II) technical scheme
In order to solve the problems, the invention provides a gravity casting process of a long shell of an oil cylinder and gear rack cavity integrated hydraulic steering engine, which comprises a mould, wherein the mould is in an integrated structure of an oil cylinder cavity, a gear rack cavity and a gear cavity, one end of the mould is provided with a first aluminum inlet, the other end of the mould is provided with a second aluminum inlet, and the mould is provided with an exhaust port and a central dead head, and further comprises the following steps:
s1, cleaning residual sand, opening the mold, putting the combined sand core, blowing the residual sand in the cavity clean, and closing the mold;
s2, injecting aluminum liquid through an aluminum inlet I and an aluminum inlet II at two ends of the mold;
s3, injecting the aluminum liquid into the mold in a tilting mode of the equipment, starting the equipment to tilt according to set time, and enabling the aluminum liquid at the first aluminum inlet and the second aluminum inlet to synchronously and slowly enter the mold cavity;
s4, after aluminum liquid from the aluminum inlet I and the aluminum inlet II is converged at the middle part of the mold cavity of the mold 1, the exhaust port is also used as a central riser, and gas and oxides in the mold cavity are exhausted;
s5, completing the turning action, converting the exhaust port and the central riser into a feeding riser function, and solidifying and forming;
and S6, erecting the equipment, automatically opening the die, and opening the die to take out the workpiece.
Preferably, the mold is an oil cylinder cavity, a gear cavity and a gear cavity which are fixedly connected in sequence.
Preferably, the die is provided with two casting ladles which are respectively connected with the first aluminum inlet and the second aluminum inlet.
Preferably, in S1, the sand core is positioned by the mold, and the gas contained in the sand core is exhausted through each exhaust passage of the mold design.
Preferably, the upper part and the lower part of the mold are both provided with the flame thrower plates with ejection function, the heating state is always implemented, and the temperature of the upper part and the lower part of the mold is controlled between 360 ℃ and 450 ℃.
Preferably, the processing amount of the oil cylinder cavity after the sand core is formed is 1.2-1.5mm, the gear cavity is formed in one step, and the processing amount of the gear cavity after the sand core is formed is 1.2-1.5 mm.
Preferably, in S3, the device is set before being started, including setting the tilting time and the tilting angle.
Preferably, in S3, the tilting angle of the apparatus tilting die is 90 degrees.
Preferably, the tilting time of the tilting die of the equipment is 16-20S.
The technical scheme of the invention has the following beneficial technical effects:
the blank produced by the process disclosed by the invention does not need to be subjected to rough machining, the blank weight of a product is reduced, the original process is simplified, the problem of overlarge wall thickness caused by core pulling is solved, the quality of the product is improved, meanwhile, the internal shrinkage porosity defect of a casting is greatly reduced, the product percent of pass is greatly improved, the gas content of the internal structure of the product is extremely reduced through the design of bidirectional aluminum feeding, the problem of air holes and pinholes in the product is solved, and the product quality is improved.
Drawings
FIG. 1 is a schematic view of the casting mold of the present invention;
FIG. 2 is a flow diagram of the process of the present invention;
FIG. 3 is a diagram of a conventional casting mold;
in the figure: 1. a mold; 2. an aluminum inlet I; 3. an aluminum inlet II; 4. the exhaust port is also used as a central riser.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example one
Referring to fig. 1-3, a hydro-cylinder and gear rack chamber integral type hydraulic steering engine long shell gravity casting process, including mould 1, mould 1 is hydro-cylinder die cavity, rack chamber and gear chamber integral type structure setting, the handling capacity of hydro-cylinder die cavity is 1.2mm, the rack chamber is the one shot forming setting, the gear chamber is the hollow setting, the handling capacity of gear chamber is 1.2mm, the one end of mould 1 is provided with into aluminium mouth one 2, the other end of mould 1 is provided with into aluminium mouth two 3, be equipped with the gas vent that holds concurrently the exhaust function and holds concurrently dead head 4 on the mould 1, still include following step:
s1, cleaning residual sand, opening the mould, putting the combined sand core, blowing off the residual sand in the cavity, closing the mould, positioning the sand core through the mould, and removing gas contained in the sand core through each exhaust passage designed by the mould;
s2, injecting aluminum liquid through a first aluminum inlet 2 and a second aluminum inlet 3 at two ends of the mold 1; the die 1 is provided with two casting ladles which are respectively connected with the first aluminum inlet 2 and the second aluminum inlet 3. The upper part and the lower part of the die 1 are both provided with flame throwers with ejection functions, the heating state is always implemented, and the temperature of the upper part and the temperature of the lower part of the die 1 are controlled at 360 ℃;
s3, injecting the aluminum liquid into the mold in a tilting mode of the equipment, starting the equipment to tilt according to set time, and enabling the aluminum liquid at the first aluminum inlet 2 and the second aluminum inlet 3 to synchronously and slowly enter the mold cavity; set up equipment before equipment starts, including setting up the time of verting and the angle of verting, the angle of verting of equipment mould is 90 degrees. The tilting time of the equipment tilting die is 16S;
s4, after aluminum liquid from the first aluminum inlet 2 and the second aluminum inlet 3 is converged at the middle part of the mold cavity of the mold 1, the exhaust port and central riser 4 with the exhaust function exhausts gas and oxides in the mold cavity;
s5, completing the turning action, converting the exhaust port and central riser 4 with the exhaust function into the feeding riser function, and solidifying and forming;
and S6, erecting the equipment, automatically opening the die, and opening the die to take out the workpiece.
Example two
Referring to fig. 1-3, a hydro-cylinder and gear rack chamber integral type hydraulic steering engine long shell gravity casting process, including mould 1, mould 1 is hydro-cylinder die cavity, rack chamber and gear chamber integral type structure setting, the handling capacity of hydro-cylinder die cavity is 1.2mm, the rack chamber is the one shot forming setting, the gear chamber is the hollow setting, the handling capacity of gear chamber is 1.2mm, the one end of mould 1 is provided with into aluminium mouth one 2, the other end of mould 1 is provided with into aluminium mouth two 3, be equipped with the gas vent that holds concurrently the exhaust function and holds concurrently dead head 4 on the mould 1, still include following step:
s1, cleaning residual sand, opening the mould, putting the combined sand core, blowing off the residual sand in the cavity, closing the mould, positioning the sand core through the mould, and removing gas contained in the sand core through each exhaust passage designed by the mould;
s2, injecting aluminum liquid through a first aluminum inlet 2 and a second aluminum inlet 3 at two ends of the mold 1; the die 1 is provided with two casting ladles which are respectively connected with the first aluminum inlet 2 and the second aluminum inlet 3. The upper part and the lower part of the die 1 are both provided with flame throwers with ejection functions, the heating state is always implemented, and the temperature of the upper part and the temperature of the lower part of the die 1 are controlled at 380 ℃;
s3, injecting the aluminum liquid into the mold in a tilting mode of the equipment, starting the equipment to tilt according to set time, and enabling the aluminum liquid at the first aluminum inlet 2 and the second aluminum inlet 3 to synchronously and slowly enter the mold cavity; set up equipment before equipment starts, including setting up the time of verting and the angle of verting, the angle of verting of equipment mould is 90 degrees. The tilting time of the equipment tilting die is 17S;
s4, after aluminum liquid from the first aluminum inlet 2 and the second aluminum inlet 3 is converged at the middle part of the mold cavity of the mold 1, the exhaust port and central riser 4 with the exhaust function exhausts gas and oxides in the mold cavity;
s5, completing the turning action, converting the exhaust port and central riser 4 with the exhaust function into the feeding riser function, and solidifying and forming;
and S6, erecting the equipment, automatically opening the die, and opening the die to take out the workpiece.
EXAMPLE III
Referring to fig. 1-3, a hydro-cylinder and gear rack chamber integral type hydraulic steering engine long shell gravity casting process, including mould 1, mould 1 is hydro-cylinder die cavity, rack chamber and gear chamber integral type structure setting, the handling capacity of hydro-cylinder die cavity is 1.2mm, the rack chamber is the one shot forming setting, the gear chamber is the hollow setting, the handling capacity of gear chamber is 1.2mm, the one end of mould 1 is provided with into aluminium mouth one 2, the other end of mould 1 is provided with into aluminium mouth two 3, be equipped with the gas vent that holds concurrently the exhaust function and holds concurrently dead head 4 on the mould 1, still include following step:
s1, cleaning residual sand, opening the mould, putting the combined sand core, blowing off the residual sand in the cavity, closing the mould, positioning the sand core through the mould, and removing gas contained in the sand core through each exhaust passage designed by the mould;
s2, injecting aluminum liquid through a first aluminum inlet 2 and a second aluminum inlet 3 at two ends of the mold 1; the die 1 is provided with two casting ladles which are respectively connected with the first aluminum inlet 2 and the second aluminum inlet 3. The upper part and the lower part of the die 1 are both provided with flame throwers with ejection functions, the heating state is always implemented, and the temperature of the upper part and the temperature of the lower part of the die 1 are controlled at 400 ℃;
s3, injecting the aluminum liquid into the mold in a tilting mode of the equipment, starting the equipment to tilt according to set time, and enabling the aluminum liquid at the first aluminum inlet 2 and the second aluminum inlet 3 to synchronously and slowly enter the mold cavity; set up equipment before equipment starts, including setting up the time of verting and the angle of verting, the angle of verting of equipment mould is 90 degrees. The tilting time of the equipment tilting die is 18S;
s4, after aluminum liquid from the first aluminum inlet 2 and the second aluminum inlet 3 is converged at the middle part of the mold cavity of the mold 1, the exhaust port and central riser 4 with the exhaust function exhausts gas and oxides in the mold cavity;
s5, completing the turning action, converting the exhaust port and central riser 4 with the exhaust function into the feeding riser function, and solidifying and forming;
and S6, erecting the equipment, automatically opening the die, and opening the die to take out the workpiece.
Example four
Referring to fig. 1-3, a gravity casting process for a long shell of an oil cylinder and gear rack cavity integrated hydraulic steering engine comprises a mold 1, wherein the mold 1 is an oil cylinder cavity, a gear rack cavity and a gear cavity integrated structure, the machining amount of the oil cylinder cavity is 1.2mm, the gear rack cavity is formed in one step, the gear cavity is hollow, the machining amount of the gear cavity is 1.2mm, one end of the mold 1 is provided with a first aluminum inlet 2, the other end of the mold 1 is provided with a second aluminum inlet 3, and a central riser 4 with an exhaust function is arranged on the mold 1 and further comprises the following steps:
s1, cleaning residual sand, opening the mould, putting the combined sand core, blowing off the residual sand in the cavity, closing the mould, positioning the sand core through the mould, and removing gas contained in the sand core through each exhaust passage designed by the mould;
s2, injecting aluminum liquid through a first aluminum inlet 2 and a second aluminum inlet 3 at two ends of the mold 1; the die 1 is provided with two casting ladles which are respectively connected with the first aluminum inlet 2 and the second aluminum inlet 3. The upper part and the lower part of the die 1 are both provided with flame throwers with ejection functions, the heating state is always implemented, and the temperature of the upper part and the temperature of the lower part of the die 1 are controlled at 420 ℃;
s3, injecting the aluminum liquid into the mold in a tilting mode of the equipment, starting the equipment to tilt according to set time, and enabling the aluminum liquid at the first aluminum inlet 2 and the second aluminum inlet 3 to synchronously and slowly enter the mold cavity; set up equipment before equipment starts, including setting up the time of verting and the angle of verting, the angle of verting of equipment mould is 90 degrees. The tilting time of the equipment tilting die is 20S;
s4, after aluminum liquid from the first aluminum inlet 2 and the second aluminum inlet 3 is converged at the middle part of the mold cavity of the mold 1, the exhaust port and central riser 4 with the exhaust function exhausts gas and oxides in the mold cavity;
s5, completing the turning action, converting the exhaust port and central riser 4 with the exhaust function into the feeding riser function, and solidifying and forming;
and S6, erecting the equipment, automatically opening the die, and opening the die to take out the workpiece.
In order to verify the technical effect of the invention, the blank of the product manufactured by the embodiment of the invention and the blank of the product manufactured by the steel core pulling process method are used as comparative examples to be compared, the section pinhole detection is carried out, the section pinhole detection data is the sum of the longitudinal section pinhole number and the transverse section pinhole number, and the following table is obtained:
as can be seen from the table, the shrinkage porosity of the internal structure of the blank produced by the process is extremely reduced, and the problem of air holes and pinholes in the product is solved.
The sand core is integrally manufactured or is manufactured in a split combined mode according to the structure aiming at the oil cylinder cavity, the gear rack cavity and the gear cavity, and has the function of enhancing exhaust, and the sand core is positioned through a die to realize installation or combined installation. The casting gate is arranged at two ends of the long shell, 2 casting ladles are fixed on the die, during casting, aluminum liquid is injected into the 2 casting ladles in an equivalent manner respectively, the tilting function of the starting device is started, the device automatically runs at a set speed and at a set angle, during the running process, the aluminum liquid entering the die cavity at two ends is converged by a riser and an air passage arranged at the center of the die, the converging process is realized, gas in the die cavity is discharged through the central riser and the air passage, after the central riser completes the exhaust function, the central riser solidifies at the tilting stage, the feeding effect on a casting in the die cavity is realized, during the process, the gas contained in the sand core is discharged from each exhaust passage of the die design, after the set solidification time is reached, the device is upright, the die is automatically opened, and the whole casting process is completed. In the casting process, the upper and lower fire spraying plates with ejection function of the die are always heated, and the temperature of the upper and lower dies of the die is controlled between 360 ℃ and 450 ℃. According to the process, the machining amount of an oil cylinder cavity is directly controlled to be 1.2-1.5mm, a rack inner cavity is formed in one step, subsequent machining is not performed, a gear cavity is directly made into a hollow core, only 1.2-1.5mm of fine machining allowance is reserved, rough machining is not needed for a blank produced by the process, the weight of the blank of a product is reduced by more than 20% compared with that of the original process, the problem of overlarge wall thickness caused by core pulling is solved, the defect of shrinkage porosity inside a casting is avoided and greatly reduced, the product percent of pass is up to more than 98%, and meanwhile, due to the design of bidirectional aluminum feeding, the gas content of the internal structure of the product is extremely reduced, and the penetration flaw detection is performed, so that no pore exists basically.
The blank produced by the process disclosed by the invention does not need to be subjected to rough machining, the blank weight of a product is reduced, the original process is simplified, the problem of overlarge wall thickness caused by core pulling is solved, the quality of the product is improved, meanwhile, the internal shrinkage porosity defect of a casting is greatly reduced, the product percent of pass is greatly improved, the gas content of the internal structure of the product is extremely reduced through the design of bidirectional aluminum feeding, the problem of air holes and pinholes in the product is solved, and the product quality is improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention.
Claims (9)
1. The utility model provides an hydro-cylinder and rack and pinion chamber integral type hydraulic steering machine long shell body gravity casting technology, a serial communication port, including mould (1), mould (1) is hydro-cylinder die cavity, rack chamber and gear chamber integral type structure setting, the one end of mould (1) is provided with into aluminium mouth one (2), and the other end of mould (1) is provided with into aluminium mouth two (3), be equipped with gas vent and central rising head (4) on mould (1), still include following step:
s1, cleaning residual sand, opening the mold, putting the combined sand core, blowing the residual sand in the cavity clean, and closing the mold;
s2, injecting aluminum liquid through a first aluminum inlet (2) and a second aluminum inlet (3) at two ends of the mold (1);
s3, injecting the aluminum liquid into the mold in a tilting mode of equipment, starting the equipment to tilt according to set time, and enabling the aluminum liquid at the first aluminum inlet (2) and the second aluminum inlet (3) to synchronously and slowly enter the mold cavity;
s4, after aluminum liquid from the aluminum inlet I (2) and the aluminum inlet II (3) is converged at the middle part of the die cavity of the die 1, the exhaust port is also used as a central riser (4) and gas and oxides in the die cavity are exhausted;
s5, completing the turning action, converting the exhaust port and the central riser (4) into a feeding riser function, and solidifying and forming;
and S6, erecting the equipment, automatically opening the die, and opening the die to take out the workpiece.
2. The gravity casting process of the long shell of the oil cylinder and gear rack cavity integrated hydraulic steering engine according to claim 1, wherein the mold (1) is formed by fixedly connecting an oil cylinder cavity, a gear rack cavity and a gear cavity in sequence.
3. The gravity casting process of the long shell of the oil cylinder and gear rack cavity integrated hydraulic steering engine according to claim 1, wherein two casting ladles are arranged on the mold (1), and are respectively connected with the first aluminum inlet (2) and the second aluminum inlet (3).
4. The gravity casting process of the long hydraulic steering engine shell with the integrated oil cylinder and the gear and rack cavity as claimed in claim 1, wherein in the step S1, a sand core is positioned through a mold, and gas contained in the sand core is exhausted through each exhaust passage designed by the mold.
5. The gravity casting process of the long shell of the hydraulic steering engine with the integrated oil cylinder and the gear and rack cavity as claimed in claim 2, wherein the upper part and the lower part of the mold (1) are both provided with the flame throwers with the ejection function, the heating state is always implemented, and the temperature of the upper part and the lower part of the mold (1) is controlled between 360 ℃ and 450 ℃.
6. The gravity casting process of the long shell of the oil cylinder and the hydraulic steering engine integrating the oil cylinder with the gear rack cavity according to claim 1, wherein the machining amount of the oil cylinder cavity after the sand core is formed is 1.2-1.5mm, the gear rack cavity is formed in one step, and the machining amount of the gear cavity after the sand core is formed is 1.2-1.5 mm.
7. The gravity casting process for the long shell of the oil cylinder and gear and rack cavity integrated hydraulic steering engine of claim 1, wherein in the step S3, the equipment is set before being started, and the setting comprises the setting of the tilting time and the tilting angle.
8. The gravity casting process of the long shell of the oil cylinder and gear and rack cavity integrated hydraulic steering engine of claim 7, wherein in the step S3, the tilting angle of the equipment tilting mold is 90 degrees.
9. The gravity casting process of the long shell of the oil cylinder and gear and rack cavity integrated hydraulic steering engine as claimed in claim 7, wherein the tilting time of the equipment tilting mold is 16-20S.
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| CN202110756795.9A CN113579168B (en) | 2021-07-05 | 2021-07-05 | Gravity casting process for long shell of hydraulic steering engine with integrated oil cylinder and gear rack cavity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114273615A (en) * | 2021-12-31 | 2022-04-05 | 山东昊方联合铸造有限公司 | Vertical top-injection side-entry type steering knuckle casting mold and casting process |
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| JP2006255776A (en) * | 2005-03-18 | 2006-09-28 | Asama Giken Co Ltd | Apparatus and method for producing cast product |
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| CN212945382U (en) * | 2020-06-30 | 2021-04-13 | 广东肇庆动力金属股份有限公司 | Tilting type gravity casting equipment |
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| CN114273615A (en) * | 2021-12-31 | 2022-04-05 | 山东昊方联合铸造有限公司 | Vertical top-injection side-entry type steering knuckle casting mold and casting process |
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| CN113579168B (en) | 2024-07-12 |
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