CN111774537A - Thin-wall complex cylinder body type iron casting shell mold pouring system and casting process - Google Patents
Thin-wall complex cylinder body type iron casting shell mold pouring system and casting process Download PDFInfo
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- CN111774537A CN111774537A CN202010591928.7A CN202010591928A CN111774537A CN 111774537 A CN111774537 A CN 111774537A CN 202010591928 A CN202010591928 A CN 202010591928A CN 111774537 A CN111774537 A CN 111774537A
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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
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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Abstract
The invention relates to a shell mold pouring system for thin-wall complex cylinder body iron casting, which comprises a pouring external mold, a sand core and a pouring gate, wherein a pouring cavity is formed in the pouring external mold; the sand core is arranged in the pouring outer die and used for forming the cylinder body casting; the pouring channel comprises an inner pouring channel, and the inner pouring channel is connected to the inside of the sand core; cast iron liquid is poured the balanced feed liquor of formula from the ingate at the pouring die cavity top, and the oil pan face of cylinder body foundry goods is upward and is the shaping of founding. The casting process comprises the steps of positioning the top cover core, combining the sand cores, fixing and bonding the sand cores, preparing for pouring, pouring the cylinder body, carrying out post-treatment, implementing a low-temperature pouring scheme on the casting, and controlling effective pouring time and hanging and supplementing pouring time. According to the invention, by improving the modeling mode of the pouring system, reasonable pouring temperature is designed, effective pouring time is controlled, the uniformity of the casting material is good, the quality structure compactness of the cylinder barrel section is high, the surface quality is good, the qualified rate of the casting is high, and the method is suitable for casting cylinder body castings which are not input by large-scale equipment.
Description
Technical Field
The invention relates to the technical field of casting of automobile engines, in particular to the technical field of shell type casting of thin-wall complex cylinder body iron casting.
Background
The cylinder body is used as an important part of an engine, conditions are improved for internal power of the engine, the cylinder body needs to have better performance, the inner cavity structure is complex and thin-walled, a traditional sand mold casting process for mass production of thin-walled complex iron castings of the existing small and medium-sized vehicle engine cylinder body is generally in a horizontal pouring modeling mode, and under the conditions, an upper box casting and a lower box casting are placed in half or close to half (split) in a two-box modeling and bottom pouring mode, or a pouring system with a main single-side liquid feeding mode, a pouring process guided by a traditional pouring time concept, and a sand mold casting process scheme of high-temperature pouring (pouring temperature 1390-1430 ℃) are adopted.
The traditional sand casting process scheme is difficult to ensure the technical requirements of quality compactness, uniformity and surface smoothness of the cylinder barrel section of the complex thin-wall cylinder body iron casting, and the cast cylinder body and other complex thin-wall iron castings have poor surface quality, more casting pores and cold insulation defects and the defective condition that the leakage rejection rate of the castings reaches 10-30 percent usually.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a shell type pouring system and a casting process for thin-wall complex cylinder body iron casting, wherein reasonable pouring temperature is designed by improving the modeling mode of the pouring system, effective pouring time and hanging and supplementing pouring time are controlled, the uniformity of casting materials is good, the quality structure compactness of a cylinder barrel section is high, the surface quality is good, the casting qualification rate is high, and the shell type pouring system and the casting process are suitable for casting cylinder body castings which are input by non-large equipment.
In order to overcome the problems in the prior art, the invention provides the following technical scheme:
a thin-wall complex cylinder body type iron casting shell mold pouring system comprises:
the casting outer die is internally provided with a pouring gate;
the sand core is arranged in the pouring outer die and used for forming the cylinder body casting;
the pouring gate comprises an inner pouring gate, the inner pouring gate is connected to the inside of the sand core, and the inner pouring gate is used for enabling the cast iron of the cylinder body casting to flow into the inside of the sand core for molding;
the cylinder body casting comprises a cylinder cover mounting surface and an oil bottom shell surface, the cylinder cover mounting surface of the cylinder body casting formed in the pouring process faces downwards, the oil bottom shell surface of the cylinder body casting faces upwards, cast iron liquid is injected from an inner pouring gate in a pouring type cavity in a top injection mode and is evenly fed, and the oil bottom shell surface of the cylinder body casting faces upwards to form a vertical type.
In the thin-wall complex cylinder body iron casting shell mold pouring system disclosed by the application, optionally, the sand core comprises a water jacket core, cylinder barrel cores, a top cover core and an end surface core, the sand core forms a left shell mold and a right shell mold, and the cylinder barrel cores comprise a middle two cylinder barrel cores and an outer two cylinder barrel cores; and the end face core is provided with a locking screw hole, and the end face core and the cylinder barrel core are fixed through a locking screw.
In the thin-wall complex cylinder body type iron casting shell mold pouring system disclosed by the application, optionally, the pouring channel comprises a sprue and a cross channel, the top of the sprue is connected with a sprue ring, a discharge port at the bottom of the sprue is communicated with the cross channel, and the bottom of the cross channel is connected with a plurality of vertically-distributed inner pouring channels with a rectangular column structure.
In the thin-wall complex cylinder body type iron casting shell mold pouring system disclosed by the application, optionally, an exhaust riser is arranged on the pouring outer mold and comprises a riser ring and a blank holder riser, the riser ring is arranged at the upper end of the pouring outer mold and communicated with the air, the blank holder riser is connected above the pouring cavity, and the blank holder riser is communicated with the riser ring.
A casting process of a shell mold of a thin-wall complex cylinder body iron casting comprises the following steps:
firstly, positioning a top cover core, namely placing the top cover core on a special positioning plate on a combined casting outer die;
secondly, combining a sand core, a water jacket core, two cylinder cores in the middle, two cylinder cores on the outer side and two end face cores;
thirdly, fixing and bonding the sand core, locking two end face cores and all cylinder barrel cores of the main body through a locking screw hole by using a locking screw, bonding a right shell core, bonding a left shell core to form a main sand core of the cylinder body, coating and drying after bonding, and checking whether abnormality exists;
fourthly, preparing pouring, namely boxing the bonded main sand cores of the complete set of cylinder body, bonding a sprue ring and bonding a riser ring;
fifthly, casting in a cylinder body, smelting raw materials, smelting qualified raw iron liquid at a proper high temperature, performing modification treatment at a tapping temperature of 1440-1470 ℃, and performing a low-temperature casting scheme on the obtained qualified cast iron liquid, casting in a sand core, and performing solidification molding;
and sixthly, post-processing, inspecting and warehousing.
In the casting process of the shell mold of the thin-wall complex cylinder iron-based casting disclosed by the application, gray cast iron and nodular cast iron are optionally used as the cast iron, and the gray cast iron is one of HT200, HT250, HT300 and HT 350; the grade of the nodular cast iron is one of QT400-15, QT450-10, QT500-7 and QT 600-3.
In the thin-walled complex cylinder block type iron casting shell mold casting process disclosed in the present application, optionally, the low-temperature casting scheme: the casting temperature is 1365-1395 ℃.
In the shell mold casting process of the thin-wall complex cylinder body iron casting, the effective casting time is 9-12 seconds, and the hanging-up casting time is 11-15 seconds.
In the thin-wall complex cylinder body type iron casting shell mold casting process disclosed by the application, the time period from the completion of the liquid iron modification treatment to the completion of casting pouring is controlled within 15 minutes optionally.
The invention has the beneficial effects that:
1. according to the invention, by changing the design of a pouring system, a cylinder body casting is arranged below a pouring gate and an exhaust riser, and a balanced liquid inlet top pouring type pouring mode, a core assembly molding mode of 'vertically casting' with a film-coated sand core, a cylinder barrel facing downwards and a large surface facing upwards, and a vertically casting molding mode are adopted, so that the exhaust of a cavity and molten iron is facilitated, the technical grade requirement of a production operator is reduced, the labor production efficiency is improved, the material compactness of the casting cylinder barrel is effectively ensured, common casting defects such as air holes, insufficient pouring, leakage and the like are overcome for the casting, the quality of the casting is improved, and the leakage rejection rate of the casting is reduced; the top pouring type balanced pouring mode ensures that the temperature gradient of the pouring cavity is in a good state of high and low, is favorable for overcoming the shrinkage defect of high-grade materials, ensures that the temperature of molten iron in the cavity is as uniform as possible and is in a positive temperature gradient distribution state, and is favorable for improving the uniformity of the material structure of a casting.
2. The reasonable low-temperature pouring process is designed, the effective pouring time and the hanging and supplementing pouring time are controlled, the density of the casting material and the surface smoothness of the casting are improved, the pouring temperature can be reduced by 25-35 ℃ compared with the pouring temperature in the traditional casting process, and the casting qualification rate of the casting is greatly improved; the machining allowance of the casting can be greatly reduced, so that the casting tends to be in a semi-precision casting level, namely, the surface of the casting is smoother, the size is more accurate, the mechanical machining is reduced or not required, the production period can be shortened, the metal material is saved, and the casting cost of the casting is reduced; meanwhile, the disposable equipment investment of small and medium-sized foundries can be reduced, and the complex thin-wall iron castings such as cylinder bodies can be cast and produced in a large batch.
The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a rear end face of a thin-wall complex cylinder body;
FIG. 2 is a schematic view of a large-area structure of a thin-wall complex cylinder body;
FIG. 3 is a schematic structural diagram of the front end face of the thin-wall complex cylinder body;
FIG. 4 is a schematic cross-sectional view B-B of a thin-walled complex cylinder block;
FIG. 5 is a schematic view of a casting process of a conventional thin-walled complex cylinder type iron casting;
FIG. 6 is a schematic large-scale direction view of a casting process of a conventional thin-wall complex cylinder type iron casting;
FIG. 7 is a schematic view from another perspective of a prior art casting process of thin-walled complex cylinder block-type iron castings;
FIG. 8 is a schematic view of a casting process of a shell mold of a thin-walled complex cylinder type iron casting;
FIG. 9 is a schematic view from another perspective of a thin-walled complex cylinder type iron casting shell mold casting process;
FIG. 10 is a process flow diagram of a shell mold casting process of a thin-walled complex cylinder block type iron casting.
In the drawings
1-cylinder block casting; 2-cylinder core; 3-cam chamber core; 4-water jacket core; 5-straight pouring channel; 6-upper transverse pouring channel; 7-lower horizontal pouring channel; 8-inner pouring channel; 9-division of a straight pouring channel; 10-a filter screen; 11-sand core exhaust passage; 12-blind riser; 121-vertical flash risers; 122-flat flash risers; 13-clear riser; 14-end face core; 15-right shell type; 16-left shell type; 17-a cross runner; 18-a sprue ring; 19-riser ring; 20-blank holder riser; 21-a parting surface; 22-locking screw holes; 23-top cover core.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the embodiments of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Moreover, embodiments of the present application may repeat reference numerals or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, 2, 3 and 4, the structure of the thin-wall complex cylinder body.
Referring to fig. 5, 6 and 7, in the existing casting process of the thin-wall complex cylinder body iron casting, an outer casting mold is adopted, a casting cavity is formed in the outer casting mold, a cylinder body casting 1 is formed in the casting cavity, and a pouring gate is arranged in the outer casting mold; the casting direction cylinder block casting 1 is formed transversely. The sand core is arranged in the casting outer die and comprises a cylinder core 2, a cam chamber core 3, a water jacket core 4 and an end face core 14, and the sand core is provided with an exhaust hole which is communicated with a sand core exhaust passage 11; the runner comprises a sprue 5, an upper runner 6, a lower runner 7, an ingate 8 and a branch sprue 9, the vertical sprue 5 is communicated with the upper runner 6 and the lower runner 7, the branch sprue 9 is connected with the transverse ingate 8 to lead to the casting cavity, and a filter screen 10 is arranged at the upper runner 6. An exhaust riser is arranged on the casting external mold, the exhaust riser comprises a blind riser 12 and an open riser 13, the open riser 13 is arranged at the upper end of the casting external mold, the open riser 13 is communicated with air, the blind riser 12 is connected to the casting cavity, the upper part of the blind riser 12 is connected with the open riser 13, and the blind riser 12 further comprises a vertical flash riser 121 and a flat flash riser 122.
The existing pouring mode is horizontal pouring, and the pouring position is as follows: half of the upper box, half of the lower box or half of the main liquid inlet interface are respectively arranged, and the temperature of molten iron in the die cavity is seriously uneven in the horizontal direction, so that molding sand at the liquid inlet side is often sintered to easily generate a sand-sticking defect, and the temperature of the molten iron opposite to the liquid inlet side is low to easily generate a cold shut and an insufficient pouring defect.
Referring to fig. 8 and 9, the invention provides a thin-wall complex cylinder body type iron casting shell mold casting system, which comprises:
the casting outer die is characterized by comprising a casting outer die, wherein a casting cavity is formed in the casting outer die, a cylinder body casting 1 is formed in the casting cavity, and a pouring gate is arranged in the casting outer die; the top of the casting outer die is provided with a parting surface 21.
The sand core is arranged in the pouring outer die and used for forming the cylinder body casting 1;
the pouring channel comprises an inner pouring channel 8, and the inner pouring channel 8 is connected to the inside of the sand core and used for enabling the cast iron of the cylinder casting 1 to flow into the inside of the sand core for forming;
the cylinder body casting 1 comprises a cylinder cover mounting surface (top cover surface) and an oil bottom shell surface (large surface), the cylinder cover mounting surface of the cylinder body casting 1 formed in the pouring process faces downwards, the oil bottom shell surface of the cylinder body casting 1 faces upwards, cast iron liquid is injected from an inner pouring gate 8 in a pouring type cavity in a top injection mode and is evenly fed, and the oil bottom shell surface of the cylinder body casting 1 faces upwards to form a vertical type. The pouring position of the cylinder body and cylinder cover mounting surface (top cover surface) facing downwards and the traditional scheme of pouring position (rotation) 90 degrees feed liquid on the oil bottom shell surface (large surface) of the cavity cylinder body through an even top pouring type pouring mode and an ingate of a pouring system in a balanced mode.
The temperature gradient of the cavity is in a good state of high and low (namely positive temperature gradient) by a top pouring type pouring mode, so that on one hand, the defect of shrinkage of high-grade materials is overcome; on the other hand, the principle that the specific gravity of molten iron is far greater than that of impurities such as slag, sand, gas and the like in the molten iron is utilized, and the requirements on material compactness, particularly compactness of a cylinder section of the cylinder body, of a high-air-tightness casting are effectively met; impurities such as slag, sand, gas and the like in the molten iron float upwards on the riser of the upper box to be removed, so that the cylinder body type casting can overcome common casting defects such as air holes, slag inclusion, sand holes and the like.
The top pouring type pouring system with uniform liquid feeding improves the state that molding sand at the liquid feeding side is often sintered to easily generate sand sticking defect and the iron liquid at the far side (opposite to the liquid feeding side) is low in temperature to easily generate cold shut and insufficient pouring defect due to serious unevenness (horizontal direction) of the iron liquid temperature of a cavity under the traditional single-side liquid feeding mode mainly adopting a pouring type. The top pouring type gating system with uniform liquid feeding enables the temperature of molten iron in the cavity to be uniform, and is beneficial to improving the casting qualification rate of castings and the surface quality of the castings.
The sand core comprises a water jacket core 4, cylinder barrel cores 2, a top cover core 23 and end face cores, the sand core forms a left shell mould 16 and a right shell mould 15, and the cylinder barrel cores 2 comprise two cylinder barrel cores 2 in the middle and two cylinder barrel cores 2 at the outer sides; and the end surface core is provided with a locking screw hole 22, and the end surface core and the cylinder barrel core 2 are fixed through a locking screw. The core assembly is a main modeling mode, on one hand, the exhaust of the natural joint surfaces of all main sand cores (all cylinder barrel cores 2 and front and rear end surface cores) to the casting cavity and the iron liquid of the cast iron is fully utilized, the defect of air holes in the cylinder body casting 1 is overcome, on the other hand, the process design and the manufacture of the exhaust system of the casting cavity are effectively simplified, the technical grade requirement on production operators is reduced, and the combination efficiency of the sand cores is improved to a certain extent.
The pouring gate comprises a straight pouring gate 5 and a horizontal pouring gate 17, the top of the straight pouring gate 5 is connected with a gate ring 18, a discharge hole at the bottom of the straight pouring gate 5 is communicated with the horizontal pouring gate 17, and the bottom of the horizontal pouring gate 17 is connected with a plurality of inner pouring gates 8 of vertically distributed rectangular column structures.
An exhaust riser is arranged on the casting external mold and comprises a riser ring 19 and an edge pressing riser 20, the riser ring 19 is arranged at the upper end of the casting external mold, the riser ring 19 is communicated with the air, the edge pressing riser 20 is connected above the casting cavity, and the edge pressing riser 20 is communicated with the riser ring 19. The pouring gate and the exhaust riser are both arranged above the cylinder body casting 1.
The cylinder barrel section of the cylinder body casting is downwards positioned at the pouring position of vertical pouring, the pouring gate system and the riser system are all or most arranged at the upper part of the cylinder body casting 1, and impurities such as slag, sand, gas and the like in molten iron float upwards in the riser at the highest position of a sand mold by utilizing the good exhaust interface of the natural combination surface between the core separating surface and the sand core so as to be smoothly discharged out of a cavity, so that the cylinder body casting is beneficial to overcoming common casting defects such as air holes, cold shut, insufficient pouring and the like of the corresponding casting.
Referring to fig. 10, the casting process of the shell mold of the thin-wall complex cylinder type iron casting comprises the following steps:
step S01, positioning the top cover core 23, and placing the top cover core 23 on a special positioning plate on the combined casting outer die;
step S02, combining the sand cores, combining the water jacket core 4, combining the two cylinder barrel cores 2 in the middle, combining the two cylinder barrel cores 2 at the outer side, and combining the two end face cores;
step S03, fixing and bonding the sand core, locking the two end face cores and all cylinder cores 2 of the main body through the locking screw hole 22 by using a locking screw, bonding the right shell type 15 core, bonding the left shell type 16 core to form the main sand core of the cylinder body, coating and drying after bonding, and checking whether the abnormality exists;
step S04, preparing pouring, namely boxing the bonded main sand cores of the whole set of cylinder body, bonding the sprue ring 18 and bonding the riser ring 19;
step S05, cylinder body pouring, raw material smelting, qualified raw iron liquid smelting at a proper high temperature, tapping at 1440-1470 ℃ for modification treatment, and implementing a low-temperature pouring scheme on the obtained qualified cast iron liquid, wherein the low-temperature pouring scheme comprises the following steps: the casting temperature is 1365-1395 ℃; the effective pouring time is 9-12 seconds, and the hanging repair pouring time is 11-15 seconds; pouring in the sand core, and solidifying and forming; the time period from the completion of the iron liquid modification treatment to the completion of casting pouring is controlled within 15 minutes;
and step S06, post-processing, checking and warehousing.
The cast iron uses gray cast iron and nodular cast iron, and the grade of the gray cast iron is one of HT200, HT250, HT300 and HT 350; the grade of the nodular cast iron is one of QT400-15, QT450-10, QT500-7 and QT 600-3.
A reasonable low-temperature pouring and effective pouring time new theory guides a designed pouring process, and the low-temperature pouring (pouring temperature is 1365-1395 ℃, and pouring time is divided into effective pouring time and hanging-up pouring time) process of complex thin-wall iron castings such as cylinder bodies and the like has the process requirements compared with the traditional high-temperature pouring (pouring temperature is 1390-1430 ℃): compared with the pouring temperature of the traditional casting process, the pouring temperature can be reduced by 25-35 ℃, which is beneficial to improving the modification treatment effect of high-grade cast iron liquid, the spheroidization treatment effect of nodular cast iron liquid and the inoculation treatment effect of gray cast iron, and the improvement and stabilization of the crystal core quantity of the material, thereby effectively improving the density of the material and the surface finish of the casting.
The whole set of sand casting mould is made by adopting a core shooter semi-automatic or automatic machine, is suitable for batch and mass production of various medium and small cylinder body iron castings, does not need skilled production operators, and can properly reduce the labor hour cost for casting the cylinder body complex thin-wall iron castings.
Compared with the traditional casting process, the method improves the uniformity of the material, the density of the casting material, especially the material compactness of the cylinder section and the surface quality (smooth finish) of the casting, overcomes the defect that molding sand at the liquid inlet side is often sintered in a single-side liquid inlet mode and is easy to produce sand sticking, and the defect that the molten iron at the far side (opposite to the liquid inlet side) is low in temperature and is easy to produce cold shut and insufficient in pouring, effectively reduces the casting defects of air holes, slag inclusion, sand holes and the like of the casting, and improves the dimensional stability of the casting. Particularly, the leakage defect of the casting is effectively reduced, and the qualification rate of the casting of the thin-wall complex cylinder body type iron casting can be improved by 5-15%.
The cylinder casting adopts a pouring system which takes uniform liquid inlet as main, a pouring position of a cylinder section downward in vertical pouring of the cylinder casting, a pouring mode which takes a top pouring mode as main and a pouring process scheme which takes a shell mold core assembly molding mode and reasonable low-temperature pouring (pouring temperature is 1365-1395 ℃) and controls effective pouring time and hanging and supplementing pouring time, and is beneficial to improving the density of casting materials and the surface finish of the casting. The method can effectively eliminate the casting defects of sand sticking, deformation, heat cracking, air holes and the like, and on the other hand, the method can greatly reduce the machining allowance of the casting, so that the casting tends to be in a semi-precision casting level, namely, the surface of the casting is smoother, the size is more accurate, the mechanical machining is reduced or not required, the production period can be shortened, the metal materials are saved, and the casting cost and the production of the casting are reduced. The whole set of sand casting mould is made by adopting a core shooter semi-automatic or automatic machine, is suitable for batch and mass production of various medium and small cylinder body iron castings, does not need skilled production operators, and can properly reduce the labor hour cost for casting the cylinder body complex thin-wall iron castings.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (9)
1. The utility model provides a complicated cylinder body class iron casting shell mould gating system of thin wall which characterized in that: the method comprises the following steps:
the casting outer die is characterized by comprising a casting outer die, wherein a casting cavity is formed in the casting outer die, a cylinder body casting (1) is formed in the casting cavity, and a pouring gate is arranged in the casting outer die;
the sand core is arranged in the pouring outer die and used for forming the cylinder body casting (1);
the pouring channel comprises an inner pouring channel (8), and the inner pouring channel (8) is connected to the inside of the sand core and is used for enabling the cast iron of the cylinder casting (1) to flow to the inside of the sand core for molding;
the cylinder body casting (1) comprises a cylinder cover mounting surface and an oil bottom shell surface, the cylinder cover mounting surface of the cylinder body casting (1) formed during pouring is downward, the oil bottom shell surface of the cylinder body casting (1) is upward, cast iron liquid is injected from an inner pouring gate (8) in a pouring type cavity in a top mode to achieve balanced liquid inlet, and the oil bottom shell surface of the cylinder body casting (1) is upward and is formed in a vertical mode.
2. The thin-walled complex cylinder block-type iron casting shell mold gating system as set forth in claim 1, wherein: the sand core comprises a water jacket core (4), a cylinder barrel core (2), a top cover core (23) and an end face core, the sand core forms a left shell type (16) and a right shell type (15), and the cylinder barrel core (2) comprises two cylinder barrel cores (2) in the middle and two cylinder barrel cores (2) at the outer side; and the end surface core is provided with a locking screw hole (22), and the end surface core and the cylinder barrel core (2) are fixed through a locking screw.
3. The thin-walled complex cylinder block-type iron casting shell mold gating system as set forth in claim 1, wherein: the pouring gate comprises a straight pouring gate (5) and a horizontal pouring gate (17), the top of the straight pouring gate (5) is connected with a pouring gate ring (18), a discharge hole at the bottom of the straight pouring gate (5) is communicated with the horizontal pouring gate (17), and the bottom of the horizontal pouring gate (17) is connected with a plurality of vertically-distributed inner pouring gates (8) with a rectangular column structure.
4. The thin-walled complex cylinder block-type iron casting shell mold gating system as set forth in claim 1, wherein: the casting external mold is provided with an exhaust riser, the exhaust riser comprises a riser ring (19) and an edge pressing riser (20), the riser ring (19) is arranged at the upper end of the casting external mold, the riser ring (19) is communicated with air, the edge pressing riser (20) is connected above the casting cavity, and the edge pressing riser (20) is communicated with the riser ring (19).
5. A casting technology of a shell mold of a thin-wall complex cylinder body iron casting is characterized in that: the method comprises the following steps:
firstly, positioning a top cover core (23), and placing the top cover core (23) on a special positioning plate on a combined casting outer die;
secondly, combining the sand core, the water jacket core (4), the middle two cylinder cores (2), the outer two cylinder cores (2) and the two end surface cores;
thirdly, fixing and bonding the sand core, locking two end face cores and all cylinder barrel cores (2) of the main body through locking screw holes (22) by using a locking screw, bonding a right shell type (15) core, bonding a left shell type (16) core to form a main sand core of the cylinder body, coating and drying after bonding, and checking whether abnormality exists or not;
fourthly, preparing pouring, namely boxing the bonded main sand cores of the whole set of cylinder body, bonding a sprue ring (18) and bonding a riser ring (19);
fifthly, casting in a cylinder body, smelting raw materials, smelting qualified raw iron liquid at a proper high temperature, performing modification treatment at a tapping temperature of 1440-1470 ℃, and performing a low-temperature casting scheme on the obtained qualified cast iron liquid, casting in a sand core, and performing solidification molding;
and sixthly, post-processing, inspecting and warehousing.
6. The thin-walled complex cylinder block-type iron casting shell casting process as claimed in claim 5, wherein: the cast iron uses gray cast iron and nodular cast iron, and the grade of the gray cast iron is one of HT200, HT250, HT300 and HT 350; the grade of the nodular cast iron is one of QT400-15, QT450-10, QT500-7 and QT 600-3.
7. The thin-walled complex cylinder block-type iron casting shell casting process as claimed in claim 5, wherein: the low-temperature pouring scheme comprises the following steps: the casting temperature is 1365-1395 ℃.
8. The thin-walled complex cylinder block-type iron casting shell casting process as claimed in claim 5, wherein: the effective pouring time is 9-12 seconds, and the hanging repair pouring time is 11-15 seconds.
9. The thin-walled complex cylinder block-type iron casting shell casting process as claimed in claim 5, wherein: the time period from the completion of the iron liquid modification treatment to the completion of casting pouring is controlled within 15 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010591928.7A CN111774537A (en) | 2020-06-24 | 2020-06-24 | Thin-wall complex cylinder body type iron casting shell mold pouring system and casting process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010591928.7A CN111774537A (en) | 2020-06-24 | 2020-06-24 | Thin-wall complex cylinder body type iron casting shell mold pouring system and casting process |
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| CN113118390A (en) * | 2021-05-25 | 2021-07-16 | 江苏力源金河铸造有限公司 | Combined sand core for large hydraulic casting and pouring process thereof |
| CN114309489A (en) * | 2021-12-30 | 2022-04-12 | 苏州勤堡精密机械有限公司 | Thin-wall in-line four-cylinder gasoline engine cylinder water jacket coreless support manufacturing process |
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