CN114210930A - Casting method and casting die for frame type engine main bearing cap - Google Patents
Casting method and casting die for frame type engine main bearing cap Download PDFInfo
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- CN114210930A CN114210930A CN202111581587.6A CN202111581587A CN114210930A CN 114210930 A CN114210930 A CN 114210930A CN 202111581587 A CN202111581587 A CN 202111581587A CN 114210930 A CN114210930 A CN 114210930A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
- B22C9/068—Semi-permanent moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
- B22C9/067—Venting means for moulds
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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
- B22C9/20—Stack moulds, i.e. arrangement of multiple moulds or flasks
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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
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D46/00—Controlling, supervising, not restricted to casting covered by a single main group, e.g. for safety reasons
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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Abstract
The invention relates to a casting method of a frame type engine main bearing cap and a casting mould thereof, the method adopts a mould curved surface parting double-layer process layout and an I-shaped pouring system, and controls the molten metal smelting chemical components with the mass percentage as follows: c content 3.60-3.80%, Si content 2.00-2.20%, Mn content 0.60-0.80%; the mold comprises a model, a metal mold arranged on the model, a pouring system and an iron mold; the mold comprises an upper mold and a lower mold which are separated by a sand core; the metal mold comprises an upper metal mold and a lower metal mold; the pouring system comprises a straight pouring gate, an upper cross pouring gate, an upper ingate, a lower cross pouring gate, a lower ingate and a lower ingate; the iron mold comprises an upper iron mold and a lower iron mold which are respectively matched with the upper mold and the lower mold. The invention can stably obtain the main bearing cap casting of the engine with the marks QT650-3 and QT700-2 which have compact structure, high dimensional precision and good surface quality in an as-cast state, can thoroughly solve the problems of shrinkage porosity, shrinkage cavity and deformation in the casting, has the process yield of 75 percent and has remarkable economic benefit.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a casting method and a casting mold for a frame type engine main bearing cover.
Background
The main bearing cap of the engine belongs to an engine cylinder body assembly, is used for being matched with a bearing bush and assembled on the engine cylinder body, plays a role in restraining a main journal of a crankshaft, enables the position of the crankshaft to be relatively fixed, only rotates without other movement, and is one of key parts on the engine.
The common engine main bearing cap casting at present is disjunctor and monolithic formula structure, and it relates to nodular cast iron trade mark and mainly has: QT400-12, QT450-10 and QT500-7 relate to gray cast iron brands mainly comprising: HT200 and HT 250. The frame type engine main bearing cap casting is usually produced by adopting the traditional sand casting, the casting process difficulty is high, shrinkage porosity and shrinkage cavity are easily generated in the casting, the deformation is easy, the process yield is low, the production efficiency is low, and the manufacturing cost is high.
Therefore, the existing casting process of the frame type engine main bearing cap has a great lifting space, and further research is needed to be perfected.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a casting method and a casting mold for a frame type engine main bearing cap, which can thoroughly solve the problems of shrinkage porosity, shrinkage cavity and deformation in a casting and can stably obtain the frame type engine main bearing cap with compact structure, high dimensional precision and good surface quality
The invention is realized by the following technical scheme:
the casting method of the frame type engine main bearing cap adopts a die curved surface parting double-layer process layout and an I-shaped pouring system, and controls the molten metal smelting chemical components in percentage by mass as follows: c content 3.60-3.80%, Si content 2.00-2.20%, Mn content 0.60-0.80%.
The casting method of the frame type engine main bearing cap comprises the following specific steps:
firstly, laying out dies, adopting a curved surface parting double-layer process, arranging die cavities of a plurality of dies according to the size of a model plate of a production line molding machine, separating the corresponding upper die cavity and the lower die cavity by sand cores, and arranging a plurality of exhaust plug holes in each die cavity according to the double-layer design of a large plane and a large plane of a casting structure;
arranging an I-shaped pouring system;
setting the thickness of the sand-lined metal mold, and designing according to the difference of the casting structure;
after the layout is finished, CAE simulation solidification is adopted for analysis, and different parameters are adjusted according to analysis results for optimization;
secondly, smelting molten metal, and controlling chemical components: c content 3.60-3.80%, Si content 2.00-2.20%, Mn content 0.60-0.80%;
thirdly, pouring, namely pouring the optimized iron mold, wherein the temperature of the iron mold is controlled to be less than or equal to 150 ℃, the pouring temperature is controlled to be 1350-;
fourthly, opening the box, loosening the box clamp 13 minutes after the pouring is finished, opening the box 18 minutes, and opening the box to ensure that the temperature of the box-opened casting is less than or equal to 500 ℃;
and fifthly, discharging the casting, placing the casting on a tray through a manipulator after the casting is unpacked, wherein the tray adopts a three-layer structure which can be stacked and assembled, and every layer of adjacent casting is placed with 2 boxes of castings without accumulation.
The casting method of the frame type engine main bearing cap comprises the following steps: the die cavity is arranged by adopting a one-type double-layer 4-12 die, wherein the upper layer 2-6 die and the lower layer 2-6 die; the large plane of the upper layer and the large plane of the lower layer are separated by a distance of 12-16 mm.
The casting method of the frame type engine main bearing cap comprises the following steps: and an upper pouring gate and a lower pouring gate are arranged on one side of the upper die cavity and the lower die cavity in a matching manner, and the corresponding upper pouring gate and the corresponding lower pouring gate share one slag collecting bag.
The casting method of the frame type engine main bearing cap comprises the following steps: the thickness of the sand-lined layer of the iron mold is set to be 7-12mm at the position of a large thickness of a crankshaft hole in the middle of the casting, and the position of the joint of the casting is set to be 10-14 mm.
The casting mould of the casting method of the frame type engine main bearing cap comprises a model, a metal mould, a pouring system and an iron mould, wherein the metal mould, the pouring system and the iron mould are arranged on the model; the mold comprises an upper mold and a lower mold separated by a sand core; the upper model is provided with an upper boss lug, an upper exhaust plug and a positioning pin; the upper lug bosses are distributed at four corners of the upper model; the upper exhaust plug is arranged at the position where the exhaust is not smooth or the air is blocked; the upper lug boss and the upper exhaust plug play a role in exhausting when the sand is shot in the modeling; the positioning pin is arranged at the middle position close to the outer side in the transverse direction and the longitudinal direction; the lower model is provided with a lower boss lug, a lower exhaust plug and a positioning sleeve; the lower boss lugs are distributed at four corners of the lower model; the lower exhaust plug is arranged at the position where the exhaust is not smooth or the air is blocked; the lower boss lug and the lower exhaust plug play a role in exhausting when molding sand shooting; the positioning sleeve is arranged at the middle position close to the outer side in the transverse direction and the longitudinal direction; the metal mold comprises an upper metal mold and a lower metal mold; the upper metal mold is arranged on the upper model, is provided with a plurality of uniformly distributed parting surfaces, is a curved surface and is arranged according to the outline of the maximum lateral dimension of the outer side; a plurality of vent plugs are arranged in each upper metal mold; the lower metal mold is arranged on the lower mold and is provided with a plurality of uniformly distributed parting surfaces, the parting surfaces are curved surfaces and are arranged according to the outline of the maximum transverse size of the outer side, and the outer side is provided with a core print; a plurality of vent plugs are arranged in each lower metal die; the pouring system comprises a straight pouring gate, an upper cross pouring gate, an upper inner pouring gate, a lower cross pouring gate, a lower inner pouring gate and a lower inner pouring gate; the sprue is vertically and convexly arranged in the center of the end face of the outer side of the upper model and is connected with the centers of the upper cross runner and the lower cross runner; the upper cross pouring gate and the lower cross pouring gate are arranged in an I shape in the whole pouring gate, and are respectively arranged on the outer end surface of the upper die and positioned between the two upper metal dies in the two adjacent rows and on the outer end surface of the lower die and positioned between the two lower metal dies in the two adjacent rows; the upper inner pouring gate is arranged on the upper model and communicated with the upper cross gate; the lower ingate is arranged on the lower model and is communicated with the lower horizontal runner; the upper inner gate and the lower inner gate correspond to each other and are respectively arranged at one lateral side of the metal molds of the upper mold and the lower mold, and the upper inner gate and the lower inner gate which correspond to each other up and down share one slag collecting bag; the iron mold comprises an upper iron mold matched with the upper mold and a lower iron mold matched with the lower mold; the upper iron mold is provided with an upper mold cavity matched with the upper mold and an upper pouring system cavity matched with the upper cross runner and the upper inner runner, and is provided with a positioning sleeve, an upper sand shooting hole and an exhaust hole; the positioning sleeve is arranged at the middle position close to the outer side in the transverse direction and the longitudinal direction and matched with the positioning pin of the upper model so as to be matched, positioned and fixed with the upper model; the upper sand shooting holes are provided with a plurality of sand shooting holes and are respectively arranged in each upper die cavity and each upper pouring system die cavity; the exhaust holes are provided with a plurality of exhaust holes arranged in each upper die cavity; the lower iron mold is provided with a lower mold cavity matched with the lower mold and a lower casting system cavity matched with the lower cross gate and the lower inner gate, and is provided with a positioning pin and a lower sand shooting hole; the positioning pin is matched and matched with the positioning sleeve of the lower model at the middle position close to the outer sides in the transverse direction and the longitudinal direction so as to be matched, positioned and fixed with the lower model; the lower sand shooting hole is respectively arranged in each lower die cavity and a wanted pouring system die cavity.
The casting mould of the casting method of the frame type engine main bearing cap comprises the following steps: the upper model is also provided with an upper electric heating pipe and an upper temperature control device; the upper electric heating pipe is arranged in the transverse side face of the upper model; the upper temperature control device is arranged on the transverse side surface of the upper die; the lower model is provided with a lower electric heating tube and a lower temperature control device; the lower electric heating pipe is arranged in the transverse side surface of the lower model; the lower temperature control device is installed on the transverse side face of the lower model.
The casting mould of the casting method of the frame type engine main bearing cap comprises the following steps: the distance between the upper model and the lower model is 12-16 mm.
The casting mould of the casting method of the frame type engine main bearing cap comprises the following steps: the number of the upper inner gates is 1-3, and the upper inner gates are arranged on one lateral side of all the upper metal molds; the number of the lower inner gates and the number of the upper inner gates are 1-3 correspondingly, and the lower inner gates and the upper inner gates are arranged on one lateral side of all the lower metal molds; the number of the slag collecting bags is 1-3 that of the upper inner gates and the lower inner gates.
The casting mould of the casting method of the frame type engine main bearing cap comprises the following steps: 5-15 vent plug holes are arranged in each cavity of the upper model, and 3-9 vent plugs are arranged in each cavity of the lower model; each die cavity of the upper iron mold is provided with 3-9 vent holes, wherein 1-3 vent holes are formed between single sheets of each die cavity; each die cavity of the upper iron mold and the lower iron mold is provided with 4-12 sand shooting holes, wherein each single-piece joint surface is provided with 1-3 sand shooting holes.
Has the advantages that:
the invention adopts the unique design of a casting mould and a casting system, and controls chemical components, iron mold temperature, casting temperature, box loosening time, box opening temperature and a casting placing mode to stably obtain the main bearing cover castings of the nodular cast iron frame type engine with the marks of QT650-3 and QT700-2, which have compact tissues, high dimensional precision and good surface quality, the process yield reaches 75 percent, the production efficiency is high, the manufacturing cost is low, the economic benefit is obvious, and the main bearing cover castings of the frame type engine are suitable for mass production;
meanwhile, the invention also has the following advantages:
(1) the invention adopts unique casting mould and pouring system design, thoroughly solves the problems of shrinkage porosity and shrinkage cavity inside the casting;
(2) according to the structural characteristics of the frame type engine main bearing cover, the large plane and the large plane corresponding to the curved surface are designed in a double-layer mode, so that the sand consumption is reduced, and the production cost is reduced;
(3) according to the invention, the trays with three layers of structures which can be stacked and assembled are used for placing the castings, and 2 boxes of castings are adjacently placed side by side on each layer, so that the problem of casting deformation is solved.
(4) According to the invention, the thickness of the sand-coated layer of the iron mold cavity is designed according to the structure of the casting in a differentiation manner, the sand-coated layer at the position with the larger thickness of the crankshaft hole in the middle of the casting is set to be 9mm, and the sand-coated layer at the position of the connection position of the casting is set to be 12mm, so that the cooling speed of the casting is accelerated or reduced in a targeted manner, and the casting has better compactness and higher quality under the condition of reducing free carbides.
Drawings
FIG. 1 is a front elevational view of an upper mold of a casting mold used in the method of casting a frame engine main bearing cap of the present invention;
FIG. 2 is a top view of a casting mold used in the method of casting a frame engine main bearing cap of the present invention;
FIG. 3 is a side view of an upper mold of a casting mold used in the method of casting a frame engine main bearing cap of the present invention;
FIG. 4 is a lower mold front view of a casting mold used in the method of casting a frame engine main bearing cap of the present invention;
FIG. 5 is a bottom view of a lower mold of a casting mold used in the method of casting a frame engine main bearing cap of the present invention;
FIG. 6 is a lower die side view of a casting die used in the method of casting a frame engine main bearing cap of the present invention;
FIG. 7 is a front iron view of a casting mold used in the method of casting a frame engine main bearing cap of the present invention;
FIG. 8 is a bottom plan view of the upper iron mold of the casting mold used in the method of casting a frame engine main bearing cap of the present invention;
fig. 9 is a front view of a lower iron mold used in the casting method of the frame type engine main bearing cap according to the present invention.
FIG. 10 is a bottom plan view of a lower iron mold for use in the method of casting a frame engine main bearing cap according to the present invention.
Detailed Description
The invention relates to a casting method of a frame type engine main bearing cap, which adopts a die curved surface parting double-layer process layout and an I-shaped pouring system, and controls the molten metal smelting chemical components with the mass percentages as follows: c content 3.60-3.80%, Si content 2.00-2.20%, Mn content 0.60-0.80%. The method comprises the following specific steps:
firstly, laying out dies, adopting a curved surface parting double-layer process, arranging die cavities of a plurality of dies according to the size of a model plate of a production line molding machine, separating the corresponding upper die cavity and the lower die cavity by sand cores, and arranging a plurality of exhaust plug holes in each die cavity according to the double-layer design of a large plane and a large plane of a casting structure;
arranging an I-shaped pouring system;
setting the thickness of the sand-lined metal mold, and designing according to the difference of the casting structure;
after the layout is finished, CAE simulation solidification is adopted for analysis, and different parameters are adjusted according to analysis results for optimization;
secondly, smelting molten metal, and controlling chemical components: c content 3.60-3.80%, Si content 2.00-2.20%, Mn content 0.60-0.80%;
thirdly, pouring, namely pouring the optimized iron mold, wherein the temperature of the iron mold is controlled to be less than or equal to 150 ℃, the pouring temperature is controlled to be 1350-;
fourthly, opening the box, loosening the box clamp 13 minutes after the pouring is finished, opening the box 18 minutes, and opening the box to ensure that the temperature of the box-opened casting is less than or equal to 500 ℃;
and fifthly, discharging the casting, placing the casting on a tray through a manipulator after the casting is unpacked, wherein the tray adopts a three-layer structure which can be stacked and assembled, and every layer of adjacent casting is placed with 2 boxes of castings without accumulation.
Wherein, preferably, the die cavity adopts a one-type double-layer 4-12 die arrangement, an upper layer 2-6 die and a lower layer 2-6 die; the large plane and the large plane of the double-layer design are separated by a distance of 12-16mm, and the sand consumption is minimum;
preferably, an upper pouring gate and a lower pouring gate are arranged on one side of the upper die cavity and one side of the lower die cavity in a matching manner, and the corresponding upper pouring gate and the corresponding lower pouring gate share one slag collecting bag;
preferably, the thickness of the sand-lined layer of the iron mold is set, and according to the structural characteristics of the casting, the sand-lined layer is 7-12mm at the position where the thickness of the crankshaft hole in the middle of the casting is large, and the sand-lined layer is 10-14mm at the position where the casting is connected.
As shown in fig. 1 to 10, the casting mold adopted in the casting method of the frame type engine main bearing cap of the invention adopts a double-layer structure, and comprises a model 1, a metal mold 2 arranged on the model 1, a pouring system 3 and an iron mold 4.
The model 1 comprises an upper model 11 and a lower model 12 which are separated by a sand core, and the upper model and the lower model are separated by a distance of 12-16 mm;
the upper model 11 is provided with an upper boss lug 111, an upper exhaust plug 112, a positioning pin 113, an upper electric heating pipe 114 and an upper temperature control device 115; the upper lug boss lugs 111 are distributed at four corners of the upper model 11, one at each corner; the upper exhaust plug 112 is arranged at the position where the exhaust is not smooth or the air is blocked; the upper lug boss 111 and the upper exhaust plug 112 play a role in exhausting when the sand is shot in the modeling; the positioning pins 113 are installed at intermediate positions laterally and longitudinally outside, one for each direction; the upper electric heating pipe 114 is arranged in the upper model 11 and is arranged in the transverse side face, and plays a role in heating during modeling; the upper temperature control device 115 is arranged on the transverse side surface of the upper model 11 and plays a role in monitoring the temperature of the upper model 11;
the lower model 12 is provided with a lower boss lug 121, a lower exhaust plug 122, a positioning sleeve 123, a lower electric heating tube 124 and a lower temperature control device 125; the lower lug boss lugs 121 are distributed at four corners of the lower model 12, and each corner is 1; the lower exhaust plug 122 is arranged at the position where the exhaust is not smooth or the air is blocked; the lower boss lug 121 and the lower exhaust plug 122 play a role in exhausting when the sand is shot in the modeling; the positioning sleeves 123 are arranged at the middle positions close to the outer sides in the transverse direction and the longitudinal direction, and one positioning sleeve is arranged in each direction; the lower electric heating tube 124 is arranged on the lower model 12 and plays a role in heating when being installed on the transverse side surface for modeling; the lower temperature control device 125 is mounted on the lateral side of the lower mold 12 and functions to monitor the temperature of the lower mold 12.
The metal mold 2 includes an upper metal mold 21 and a lower metal mold 22;
the upper metal mold 21 is arranged on the upper mold 11, is provided with a plurality of uniformly distributed parting surfaces, is a curved surface and is arranged according to the outline of the maximum transverse size of the outer side; the number of the upper metal molds 21 is preferably 2-6, and a plurality of vent plugs, preferably 5-15, are arranged in each upper metal mold 21;
the lower metal mold 22 is arranged on the lower mold 12, is provided with a plurality of uniformly distributed parting surfaces, is a curved surface and is arranged according to the outline of the maximum transverse size of the outer side, and the outer side is provided with a core print; the number of the lower metal molds 21 is preferably 2 to 6, and a plurality of vent plugs, preferably 3 to 9, are provided in each lower metal mold 12.
The gating system 3 comprises a sprue 31, an upper runner 32, an upper ingate 33, an upper ingate 34, a lower runner 35, a lower ingate 36 and a lower ingate 37;
the sprue 31 is vertically and convexly arranged at the center of the outer end face of the upper model 11 and is connected with the centers of the upper runner 32 and the lower runner 35;
the upper cross runner 32 and the lower cross runner 35 are arranged in an I shape in the whole runner, and the upper cross runner 32 is arranged on the end surface of the outer side of the upper model 11 and is positioned between two upper metal molds 21 in two adjacent rows; the lower cross gate 35 is arranged on the outer end surface of the lower mold 12 and between two lower metal molds 22 in two adjacent rows;
an upper ingate 33 is provided in the upper mold 11 and communicates with the upper ingate 32; the lower ingate 36 is arranged in the lower mold and is communicated with the lower cross gate 35;
the upper inner gates 34 are arranged at one side of all the metal molds 21 of the upper mold 11 in the transverse direction, the lower inner gates 37 and the upper inner gates 34 are arranged at one side of all the metal molds 22 of the lower mold 12 in the transverse direction, and the upper inner gates 34 and the lower inner gates 37 which correspond to each other in the upper and lower direction share one slag collecting bag; preferably, the number of the upper inner gates 34 is 1-3, the number of the lower inner gates 37 is 1-3, and the number of the matched slag traps is 1-3.
The iron mold 4 comprises an upper iron mold 41 and a lower iron mold 42;
the upper iron mold 41 and the upper mold 11 are assembled, and the upper iron mold is provided with an upper mold cavity matched with the upper mold 11 and an upper pouring system cavity matched with the upper cross runner 32 and the upper inner runner 33, and is provided with a positioning sleeve 411, an upper sand shooting hole 412 and an exhaust hole 413; the positioning sleeves 411 are respectively arranged at the middle positions close to the outer sides in the transverse direction and the longitudinal direction, and are matched with the positioning pins 113 of the upper model 11 in each direction so as to be matched, positioned and fixed with the upper model 11; the upper sand shooting holes 412 are provided in a plurality and are respectively arranged in each mold cavity and the casting system mold cavity, and preferably, 4-12 upper sand shooting holes are arranged in each mold cavity; the exhaust holes 413 are provided in a plurality of each die cavity, preferably 3-9 in each die cavity, and 1-3 in each die cavity single piece for exhausting air during casting;
the lower iron mold 42 and the lower mold 12 are matched, and the lower iron mold is provided with a lower mold cavity matched with the lower mold 12 and a lower pouring system cavity matched with the lower cross gate 35 and the lower inner gate 36, and is provided with a positioning pin 421 and a lower sand shooting hole 422; the positioning pins 421 are respectively arranged at the middle positions close to the outer sides in the transverse direction and the longitudinal direction, and are matched and matched with the positioning sleeve 123 of the lower model 12 in each direction so as to be matched, positioned and fixed with the lower model 12; the lower shooting pot 422 has a number of holes, preferably 4-12, respectively, provided in each cavity and the gating system cavity.
And analyzing the casting mould by adopting CAE simulated solidification:
1. and (3) a mold filling process: when the mold is filled for 11.35s, the molten metal is filled;
2. and (3) solidification process: when the critical porosity is 1.0%, the casting does not have shrinkage cavity and shrinkage porosity;
3. CAE simulation analysis results
And (3) a mold filling process: the molten metal is relatively stable in the mold filling flowing process, and the adverse phenomena of air entrainment, insufficient pouring and the like do not occur;
and (3) solidification process: in the solidification process, the temperature field of the casting is uniform, the phenomena of shrinkage cavity and shrinkage porosity are not found in the casting body, and only the shrinkage cavity and the shrinkage porosity are formed in the pouring gate;
the simulation result shows that the casting structure is compact, no shrinkage porosity and shrinkage cavity exist, and the requirements of products are completely met, so that the casting process scheme is feasible.
The invention is further described below by way of example with EA897 frame engine main bearing caps:
the maximum external dimension of the EA897 frame type engine main bearing cap is as follows: length × width × height =315.3 × 203.0 × 76.0 mm;
EA897 frame type engine main bearing cap material requirement:
mechanical properties: the tensile strength (MPa) is more than or equal to 650MPa, the yield strength (MPa) is more than or equal to 380MPa, the elongation (%) is more than or equal to 3%, and the Hardness (HB) is 215-;
metallographic structure: the pearlite amount (P) is more than or equal to 70 percent and less than or equal to 95 percent, the graphite size is 5-8 grades, the spheroidization rate is more than or equal to 90 percent, and the content of free carbide is less than or equal to 1 percent.
Example 1
Firstly, a casting mold is provided
Arranging 8 mold cavities of one mold according to the size of a model plate of a production line molding machine by using a curved surface parting double-layer process layout, wherein an upper layer 4 mold and a lower layer 4 mold are separated by a sand core corresponding to the upper mold cavity and the lower mold, and the distance between the upper mold and the lower mold is 14 mm; each die cavity of the upper metal die is provided with 10 exhaust plug holes, and each die cavity of the lower metal die is provided with 6 exhaust plugs;
the pouring system is arranged in an I shape, 3 inner gates are arranged at one side of each mold cavity corresponding to the upper layer and the lower layer, and the corresponding inner gates of the upper layer and the lower layer share one slag collecting bag;
setting the thickness of an iron mold sand-coated layer, wherein according to the structural characteristics of the casting, the sand-coated layer at the position of a crankshaft hole in the middle of the casting is 9mm, and the sand-coated layer at the position of a casting joint is 12 mm; each die cavity of the upper iron mold is provided with 6 vent holes, wherein 2 vent holes are formed between each single die cavity sheet and each single sheet;
each die cavity of the upper iron mold and the lower iron mold is provided with 8 sand shooting holes, wherein each single joint surface is provided with 2 sand shooting holes;
analyzing the design by adopting CAE (computer aided engineering) simulated solidification, and adjusting parameters according to an analysis result;
secondly, smelting molten metal, controlling chemical components, namely 3.75% of C, 2.12% of Si and 0.66% of Mn, and controlling the effluent temperature to 1515 ℃;
thirdly, pouring, wherein the first pouring temperature is controlled to be 1400 ℃, the non-pouring temperature is controlled to be 1372 ℃, the pouring time of the 1 st box is controlled to be 14.5 seconds, the pouring time of the 2 nd box is controlled to be 14.3 seconds, the pouring time of the 3 rd box is controlled to be 13.9 seconds, the pouring time of the 4 th box is controlled to be 14.9 seconds, and the pouring time of the 5 th box is controlled to be 15.5 seconds; wherein the 1 st to 5 th box iron molds are all cold iron molds before casting;
fourthly, opening the box, loosening the box clamp 13 minutes after the pouring is finished, opening the box for 18 minutes, wherein the opening temperature of the 1 st box casting is 368 ℃, the opening temperature of the 2 nd box casting is 362 ℃, the opening temperature of the 3 rd box casting is 345 ℃, the opening temperature of the 4 th box casting is 363 ℃, and the opening temperature of the 5 th box casting is 351 ℃;
fifthly, casting, placing the 1 st box and the 2 nd box on the bottom tray side by side adjacently through a manipulator after casting and unpacking, then assembling the lower tray on 4 corners of the upper tray, then placing the 3 rd box and the 4 th box on the lower tray side by side adjacently in sequence, then assembling the third tray on 4 corners of the lower tray in sequence, and finally placing the 5 th box on the uppermost layer.
Test results
The same package iron liquid pouring of this embodiment is to last case and first case foundry goods body sample, and a case foundry goods is got a blank and is detected, and 8 of a case, inspection metallographic structure and mechanical properties result are as follows:
TABLE 1 metallographic structure
TABLE 2 mechanical Properties
In the embodiment, the same ladle is used for pouring, all castings in the 2 nd and 4 th cases are subjected to slicing and X-ray flaw detection, shrinkage cavities and shrinkage porosity are not found in the castings, and deformation of the castings is not found by performing full-scale detection after all the castings in the 3 rd case are subjected to shot blasting.
Example 2
A casting mold was set as in example 1: the die cavities are arranged into 6 pieces, an upper layer 3 die and a lower layer 3 die, and the distance between the upper die and the lower die is 16 mm; 15 exhaust plug holes are arranged in each die cavity of the upper metal die, and 9 exhaust plugs are arranged in each die cavity of the lower metal die; the pouring system is arranged in an I shape, 3 inner gates are arranged at one side of each mold cavity corresponding to the upper layer and the lower layer, and 3 slag collecting bags are matched with the corresponding inner gates of the upper layer and the lower layer; setting the thickness of an iron mold sand-lined layer, setting the position of a large thickness position of a crankshaft hole in the middle of a casting to be 10mm, and setting the position of a connection position of the casting to be 11 mm; each die cavity of the upper iron mold is provided with 3 vent holes, wherein 1 vent hole is arranged between each single die cavity sheet and each single sheet; each die cavity of the upper iron mold and the lower iron mold is provided with 12 sand shooting holes, wherein each single joint surface is provided with 3 sand shooting holes; analyzing the design by adopting CAE (computer aided engineering) simulated solidification, and adjusting parameters according to an analysis result;
then smelting molten metal, and controlling chemical components, wherein the content of C is 3.63 percent, the content of Si is 2.09 percent, and the content of Mn is 0.70 percent;
pouring, wherein the water outlet temperature is controlled to be 1490 ℃, the primary pouring temperature is controlled to be 1395 ℃, the non-pouring temperature is controlled to be 1356 ℃, the pouring time of the 1 st box is 14.0 seconds, the pouring time of the 2 nd box is 13.6 seconds, the pouring time of the 3 rd box is 12.8 seconds, the pouring time of the 4 th box is 14.1 seconds, and the pouring time of the 5 th box is 15.2 seconds; wherein the temperature of the iron mold of the 1 st box is 125 ℃, the temperature of the iron mold of the 2 nd box is 120 ℃, the temperature of the iron mold of the 3 rd box is 135 ℃, the temperature of the iron mold of the 4 th box is 147 ℃ and the temperature of the iron mold of the 5 th box is 134 ℃ before pouring.
Opening the box, loosening the box clamp 13 minutes after pouring, opening the box for 18 minutes, wherein the opening temperature of the casting in the 1 st box is 475 ℃, the opening temperature of the casting in the 2 nd box is 461 ℃, the opening temperature of the casting in the 3 rd box is 430 ℃, the opening temperature of the casting in the 4 th box is 412 ℃ and the opening temperature of the casting in the 5 th box is 405 ℃;
and (3) discharging castings, placing the 1 st box and the 2 nd box castings on the bottom tray side by side adjacently through a manipulator after casting and unpacking, then assembling the lower tray on the upper tray at 4 corners, then placing the 3 rd box and the 4 th box castings on the lower tray side by side adjacently in sequence, then sequentially assembling the third tray on the lower tray at 4 corners, and finally placing the 5 th box castings on the uppermost layer.
Test results
The same package iron liquid pouring of this embodiment is to last case and first case foundry goods body sample, and a case foundry goods is got a blank and is detected, 6 one of a case, and inspection metallographic structure and mechanical properties result are as follows:
TABLE 3 metallographic structure
TABLE 4 mechanical Properties
In the embodiment, the same ladle is used for pouring, all castings in the 2 nd and 4 th cases are subjected to slicing and X-ray flaw detection, shrinkage cavities and shrinkage porosity are not found in the castings, and deformation of the castings is not found by performing full-scale detection after all the castings in the 3 rd case are subjected to shot blasting.
Example 3
The same procedure as in example 1 was followed by first setting up a casting mold: the die cavities are arranged into 4 pieces of a first die, an upper layer 2 die and a lower layer 2 die, and the upper die and the lower die are separated by a distance of 12 mm; each die cavity of the upper metal die is provided with 5 exhaust plug holes, and each die cavity of the lower metal die is provided with 3 exhaust plugs; the pouring system is arranged in an I shape, one side of each mold cavity corresponding to the upper layer and the lower layer is provided with 1 inner sprue, and 1 slag collecting bag is matched with the corresponding inner sprue of the upper layer and the lower layer; setting the thickness of an iron mold sand-lined layer, setting the position of a large thickness position of a crankshaft hole in the middle of a casting to be 8mm, and setting the position of a connection position of the casting to be 9 mm; each die cavity of the upper iron mold is provided with 3 vent holes, wherein 1 vent hole is arranged between each single die cavity sheet and each single sheet; each die cavity of the upper iron mold and the lower iron mold is provided with 4 sand shooting holes, wherein each single joint surface is provided with 1 sand shooting hole; analyzing the design by adopting CAE (computer aided engineering) simulated solidification, and adjusting parameters according to an analysis result;
smelting molten metal, and controlling chemical components, wherein the content of C is 3.61%, the content of Si is 2.18%, and the content of Mn is 0.62%;
pouring, wherein the effluent temperature is controlled to be 1505 ℃, the first pouring temperature is controlled to be 1420 ℃, the non-pouring temperature is controlled to be 1376 ℃, the pouring time of the 1 st box is controlled to be 13.1 seconds, the pouring time of the 2 nd box is controlled to be 12.5 seconds, the pouring time of the 3 rd box is controlled to be 11.9 seconds, the pouring time of the 4 th box is controlled to be 13.5 seconds, and the pouring time of the 5 th box is controlled to be 12.7 seconds; wherein the iron mold of the 1 st and 2 nd boxes is a cold iron mold before casting, the temperature of the iron mold of the 3 rd box is 126 ℃, the temperature of the iron mold of the 4 th box is 135 ℃, and the temperature of the iron mold of the 5 th box is 139 ℃;
opening the box, loosening the box clamp 13 minutes after the pouring is finished, opening the box for 18 minutes, wherein the opening temperature of the 1 st box casting is 395 ℃, the opening temperature of the 2 nd box casting is 382 ℃, the opening temperature of the 3 rd box casting is 451 ℃, the opening temperature of the 4 th box casting is 431 ℃ and the opening temperature of the 5 th box casting is 423 ℃;
and (3) discharging castings, placing the 1 st box and the 2 nd box castings on the bottom tray side by side adjacently through a manipulator after casting and unpacking, then assembling the lower tray on the upper tray at 4 corners, then placing the 3 rd box and the 4 th box castings on the lower tray side by side adjacently in sequence, then sequentially assembling the third tray on the lower tray at 4 corners, and finally placing the 5 th box castings on the uppermost layer.
Test results
The same package iron liquid pouring of this embodiment is to last case and first case foundry goods body sample, and a case foundry goods is got a blank and is detected, 4 one casees, and inspection metallographic structure and mechanical properties result are as follows:
TABLE 5 metallographic structure
TABLE 6 mechanical Properties
In the embodiment, the same ladle is used for pouring, all castings in the 2 nd and 4 th cases are subjected to slicing and X-ray flaw detection, shrinkage cavities and shrinkage porosity are not found in the castings, and deformation of the castings is not found by performing full-scale detection after all the castings in the 3 rd case are subjected to shot blasting.
Example 4
The casting mold set-up was the same as in example 1: the die cavities are arranged into 6 pieces, an upper layer 3 die and a lower layer 3 die, and the distance between the upper die and the lower die is 14 mm; 12 exhaust plug holes are arranged in each die cavity of the upper metal die, and 8 exhaust plugs are arranged in each die cavity of the lower metal die; the pouring system is arranged in an I shape, 2 inner gates are arranged at one side of each mold cavity corresponding to the upper layer and the lower layer, and 2 slag collecting bags are matched with the corresponding inner gates of the upper layer and the lower layer; setting the thickness of the sand-lined layer of the iron mold, setting the position of the large thickness of a crankshaft hole in the middle of the casting to be 9mm, and setting the position of the joint of the casting to be 10 mm; each die cavity of the upper iron mold is provided with 6 vent holes, wherein 2 vent holes are formed between each single die cavity sheet and each single sheet; each die cavity of the upper iron mold and the lower iron mold is provided with 12 sand shooting holes, wherein each single joint surface is provided with 3 sand shooting holes; analyzing the design by adopting CAE (computer aided engineering) simulated solidification, and adjusting parameters according to an analysis result;
smelting molten metal, and controlling chemical components, wherein the content of C is 3.78%, the content of Si is 2.05%, and the content of Mn is 0.75%;
pouring, wherein the outlet water temperature is controlled to be 1498 ℃, the first pouring temperature is controlled to be 1391 ℃, the non-pouring temperature is controlled to be 1361 ℃, the pouring time of the 1 st box is 14.1 seconds, the pouring time of the 2 nd box is 13.7 seconds, the pouring time of the 3 rd box is 12.3 seconds, the pouring time of the 4 th box is 13.0 seconds, and the pouring time of the 5 th box is 12.9 seconds; wherein the temperature of the 1 st box iron mold is 146 ℃, the temperature of the 2 nd box iron mold is 141 ℃ and the 3 rd, 4 th and 5 th box iron molds are cold iron molds before casting;
opening the box, loosening the box clamp 13 minutes after the pouring is finished, opening the box for 18 minutes, wherein the box opening temperature of the 1 st box casting is 456 ℃, the box opening temperature of the 2 nd box casting is 439 ℃, the box opening temperature of the 3 rd box casting is 384 ℃, the box opening temperature of the 4 th box casting is 369 ℃ and the box opening temperature of the 5 th box casting is 346 ℃;
and (3) discharging castings, placing the 1 st box and the 2 nd box castings on the bottom tray side by side adjacently through a manipulator after casting and unpacking, then assembling the lower tray on the upper tray at 4 corners, then placing the 3 rd box and the 4 th box castings on the lower tray side by side adjacently in sequence, then sequentially assembling the third tray on the lower tray at 4 corners, and finally placing the 5 th box castings on the uppermost layer.
Test results
The same package iron liquid pouring of this embodiment is to last case and first case foundry goods body sample, and a case foundry goods is got a blank and is detected, 6 one of a case, and inspection metallographic structure and mechanical properties result are as follows:
TABLE 7 metallographic structure
TABLE 8 mechanical Properties
In the embodiment, the same ladle is used for pouring, all castings in the 2 nd and 4 th cases are subjected to slicing and X-ray flaw detection, shrinkage cavities and shrinkage porosity are not found in the castings, and deformation of the castings is not found by performing full-scale detection after all the castings in the 3 rd case are subjected to shot blasting.
Example 5
A casting mold was set as in example 1: the die cavities are arranged into 8 pieces of a first die, an upper layer 4 die and a lower layer 4 die, and the distance between the upper die and the lower die is 15 mm; each die cavity of the upper metal die is provided with 14 exhaust plug holes, and each die cavity of the lower metal die is provided with 8 exhaust plugs; the pouring system is arranged in an I shape, 3 inner gates are arranged at one side of each mold cavity corresponding to the upper layer and the lower layer, and 3 slag collecting bags are matched with the corresponding inner gates of the upper layer and the lower layer; setting the thickness of the sand-lined layer of the iron mold, setting the position of the large thickness of a crankshaft hole in the middle of the casting to be 7mm, and setting the position of the joint of the casting to be 10 mm; each die cavity of the upper iron mold is provided with 9 vent holes, wherein 3 vent holes are formed between each single die cavity sheet and each single sheet; each die cavity of the upper iron mold and the lower iron mold is provided with 8 sand shooting holes, wherein each single joint surface is provided with 2 sand shooting holes; analyzing the design by adopting CAE (computer aided engineering) simulated solidification, and adjusting parameters according to an analysis result;
smelting molten metal, and controlling chemical components, wherein the content of C is 3.70%, the content of Si is 2.11%, and the content of Mn is 0.71%;
pouring, wherein the effluent temperature is controlled to be 1500 ℃, the primary pouring temperature is 1392 ℃, the non-pouring temperature is 1354 ℃, the pouring time of the 1 st box is 13.8 seconds, the pouring time of the 2 nd box is 13.4 seconds, the pouring time of the 3 rd box is 12.9 seconds, the pouring time of the 4 th box is 13.5 seconds, and the pouring time of the 5 th box is 13.0 seconds; wherein the temperature of the 1 st box iron mold is 132 ℃, the temperature of the 2 nd box iron mold is 127 ℃, the temperature of the 3 rd box iron mold is 129 ℃, the temperature of the 4 th box iron mold is 98 ℃ and the temperature of the 5 th box iron mold is 115 ℃ before casting;
opening the box, loosening the box card 13 minutes after the pouring is finished, opening the box for 18 minutes, wherein the opening temperature of the casting in the 1 st box is 467 ℃, the opening temperature of the casting in the 2 nd box is 465 ℃, the opening temperature of the casting in the 3 rd box is 457 ℃, the opening temperature of the casting in the 4 th box is 401 ℃ and the opening temperature of the casting in the 5 th box is 410 ℃;
and (3) discharging castings, placing the 1 st box and the 2 nd box castings on the bottom tray side by side adjacently through a manipulator after casting and unpacking, then assembling the lower tray on the upper tray at 4 corners, then placing the 3 rd box and the 4 th box castings on the lower tray side by side adjacently in sequence, then sequentially assembling the third tray on the lower tray at 4 corners, and finally placing the 5 th box castings on the uppermost layer.
Test results
The same package iron liquid pouring of this embodiment is to last case and first case foundry goods body sample, and a case foundry goods is got a blank and is detected, and 8 of a case, inspection metallographic structure and mechanical properties result are as follows:
TABLE 9 metallographic structure
TABLE 10 mechanical Properties
In the embodiment, the same ladle is used for pouring, all castings in the 2 nd and 4 th cases are subjected to slicing and X-ray flaw detection, shrinkage cavities and shrinkage porosity are not found in the castings, and deformation of the castings is not found by performing full-scale detection after all the castings in the 3 rd case are subjected to shot blasting.
The size of the plate of the molding machine of the existing production line is used for producing the EA897 frame type engine main bearing cap, 2 layers of 8 molds are optimally distributed, and the number of the molds can be increased to 10-12 molds for smaller products, so that the molding machine is more economical.
The casting production example is carried out under the condition that the casting mold and the pouring system form production conditions, the casting state can stably obtain the nodular cast iron frame type main bearing cap casting with compact structure, high dimensional precision and good surface quality by strictly controlling chemical components, iron mold temperature, pouring temperature, box loosening time, box opening temperature and casting discharging mode, and the problems of shrinkage porosity, shrinkage cavity and deformation in the casting can be thoroughly solved.
Claims (10)
1. A casting method of a frame type engine main bearing cap adopts a die curved surface parting double-layer process layout and an I-shaped pouring system, and controls the molten metal smelting chemical components in percentage by mass as follows: c content 3.60-3.80%, Si content 2.00-2.20%, Mn content 0.60-0.80%.
2. A method of casting a frame type engine main bearing cap as claimed in claim 1, including the steps of:
the method comprises the following steps that firstly, a mould is laid out, a curved surface parting double-layer process is adopted, a mould cavity of a first double-layer multi-mould is arranged according to the size of a model plate of a production line molding machine, an upper mould cavity and a lower mould cavity are correspondingly separated by a sand core, and a plurality of exhaust plug holes are arranged in each mould cavity according to the double-layer design of a large plane and a large plane of a casting structure;
arranging an I-shaped pouring system;
setting the thickness of the sand-lined metal mold, and designing according to the difference of the casting structure;
after the layout is finished, CAE simulation solidification is adopted for analysis, and different parameters are adjusted according to analysis results for optimization;
secondly, smelting molten metal, and controlling chemical components: c content 3.60-3.80%, Si content 2.00-2.20%, Mn content 0.60-0.80%;
thirdly, pouring, namely pouring the optimized iron mold, wherein the temperature of the iron mold is controlled to be less than or equal to 150 ℃, the pouring temperature is controlled to be 1350-;
fourthly, opening the box, loosening the box clamp 13 minutes after the pouring is finished, opening the box 18 minutes, and opening the box to ensure that the temperature of the box-opened casting is less than or equal to 500 ℃;
and fifthly, discharging the casting, placing the casting on a tray through a manipulator after the casting is unpacked, wherein the tray adopts a three-layer structure which can be stacked and assembled, and every layer of adjacent casting is placed with 2 boxes of castings without accumulation.
3. A method of casting a frame engine main bearing cap according to claim 2, wherein: the die cavity adopts a one-type double-layer 4-12 die, wherein the upper layer 2-6 die and the lower layer 2-6 die; the large plane of the upper layer and the large plane of the lower layer are separated by a distance of 12-16 mm.
4. A method of casting a frame engine main bearing cap according to claim 2, wherein: and an upper pouring gate and a lower pouring gate are arranged on one side of the upper die cavity and the lower die cavity in a matching manner, and the corresponding upper pouring gate and the corresponding lower pouring gate share one slag collecting bag.
5. A method of casting a frame engine main bearing cap according to claim 2, wherein: the thickness of the sand-lined layer of the iron mold is set to be 7-12mm at the position of a large thickness of a crankshaft hole in the middle of the casting, and the position of the joint of the casting is set to be 10-14 mm.
6. A casting mold for a method of casting a frame type engine main bearing cap as claimed in any one of claims 1 to 6, wherein: the die is arranged in a double-layer mode and comprises a die, a metal die, a pouring system and an iron die, wherein the metal die, the pouring system and the iron die are arranged on the die;
the mold comprises an upper mold and a lower mold separated by a sand core; the upper model is provided with an upper boss lug, an upper exhaust plug and a positioning pin; the upper lug bosses are distributed at four corners of the upper model; the upper exhaust plug is arranged at the position where the exhaust is not smooth or the air is blocked; the upper lug boss and the upper exhaust plug play a role in exhausting when the sand is shot in the modeling; the positioning pin is arranged at the middle position close to the outer side in the transverse direction and the longitudinal direction; the lower model is provided with a lower boss lug, a lower exhaust plug and a positioning sleeve; the lower boss lugs are distributed at four corners of the lower model; the lower exhaust plug is arranged at the position where the exhaust is not smooth or the air is blocked; the lower boss lug and the lower exhaust plug play a role in exhausting when molding sand shooting; the positioning sleeve is arranged at the middle position close to the outer side in the transverse direction and the longitudinal direction;
the metal mold comprises an upper metal mold and a lower metal mold; the upper metal mold is arranged on the upper model, is provided with a plurality of uniformly distributed parting surfaces, is a curved surface and is arranged according to the outline of the maximum lateral dimension of the outer side; a plurality of vent plugs are arranged in each upper metal mold; the lower metal mold is arranged on the lower mold and is provided with a plurality of uniformly distributed parting surfaces, the parting surfaces are curved surfaces and are arranged according to the outline of the maximum transverse size of the outer side, and the outer side is provided with a core print; a plurality of vent plugs are arranged in each lower metal die;
the pouring system comprises a straight pouring gate, an upper cross pouring gate, an upper inner pouring gate, a lower cross pouring gate, a lower inner pouring gate and a lower inner pouring gate; the sprue is vertically and convexly arranged in the center of the end face of the outer side of the upper model and is connected with the centers of the upper cross runner and the lower cross runner; the upper cross pouring gate and the lower cross pouring gate are arranged in an I shape in the whole pouring gate, and are respectively arranged on the outer end surface of the upper die and positioned between the two upper metal dies in the two adjacent rows and on the outer end surface of the lower die and positioned between the two lower metal dies in the two adjacent rows; the upper inner pouring gate is arranged on the upper model and communicated with the upper cross gate; the lower ingate is arranged on the lower model and is communicated with the lower horizontal runner; the upper inner gate and the lower inner gate correspond to each other and are respectively arranged at one lateral side of the metal molds of the upper mold and the lower mold, and the upper inner gate and the lower inner gate which correspond to each other up and down share one slag collecting bag;
the iron mold comprises an upper iron mold matched with the upper mold and a lower iron mold matched with the lower mold; the upper iron mold is provided with an upper mold cavity matched with the upper mold and an upper pouring system cavity matched with the upper cross runner and the upper inner runner, and is provided with a positioning sleeve, an upper sand shooting hole and an exhaust hole; the positioning sleeve is arranged at the middle position close to the outer side in the transverse direction and the longitudinal direction and matched with the positioning pin of the upper model so as to be matched, positioned and fixed with the upper model; the upper sand shooting holes are provided with a plurality of sand shooting holes and are respectively arranged in each upper die cavity and each upper pouring system die cavity; the exhaust holes are provided with a plurality of exhaust holes arranged in each upper die cavity;
the lower iron mold is provided with a lower mold cavity matched with the lower mold and a lower casting system cavity matched with the lower cross gate and the lower inner gate, and is provided with a positioning pin and a lower sand shooting hole; the positioning pin is matched and matched with the positioning sleeve of the lower model at the middle position close to the outer sides in the transverse direction and the longitudinal direction so as to be matched, positioned and fixed with the lower model; the lower sand shooting hole is respectively arranged in each lower die cavity and a wanted pouring system die cavity.
7. A casting mold for a method of casting a frame type engine main bearing cap as claimed in claim 6, wherein: the upper model is also provided with an upper electric heating pipe and an upper temperature control device; the upper electric heating pipe is arranged in the transverse side face of the upper model; the upper temperature control device is arranged on the transverse side surface of the upper die;
the lower model is provided with a lower electric heating tube and a lower temperature control device; the lower electric heating pipe is arranged in the transverse side surface of the lower model; the lower temperature control device is installed on the transverse side face of the lower model.
8. A casting mold for a method of casting a frame type engine main bearing cap as claimed in claim 6, wherein: the distance between the upper model and the lower model is 12-16 mm.
9. A casting mold for a method of casting a frame type engine main bearing cap as claimed in claim 6, wherein: the number of the upper inner gates is 1-3, and the upper inner gates are arranged on one lateral side of all the upper metal molds; the number of the lower inner gates and the number of the upper inner gates are 1-3 correspondingly, and the lower inner gates and the upper inner gates are arranged on one lateral side of all the lower metal molds; the number of the slag collecting bags is 1-3 that of the upper inner gates and the lower inner gates.
10. A casting mold for a method of casting a frame type engine main bearing cap as claimed in claim 6, wherein: 5-15 vent plug holes are arranged in each die cavity of the upper metal die, and 3-9 vent plugs are arranged in each die cavity of the lower metal die;
each die cavity of the upper iron mold is provided with 3-9 vent holes, wherein 1-3 vent holes are formed between single sheets of each die cavity;
each die cavity of the upper iron mold and the lower iron mold is provided with 4-12 sand shooting holes, wherein each single-piece joint surface is provided with 1-3 sand shooting holes.
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| CA2095081A1 (en) * | 1992-05-14 | 1993-11-15 | Alan Peter Druschitz | Mold for Producing Thin Wall Castings by Gravity Pouring |
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| CN106001446A (en) * | 2016-08-09 | 2016-10-12 | 十堰市泰祥实业股份有限公司 | Method and mold for producing passenger car engine single-chip main bearing cover |
| CN106392012A (en) * | 2016-09-26 | 2017-02-15 | 侯马市东鑫机械铸造有限公司 | Design method for nodular cast iron crankshaft curved face parting mold |
| CN213256969U (en) * | 2020-08-31 | 2021-05-25 | 天津铸星金属制品有限公司 | Novel investment casting sand shell is dry device |
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2021
- 2021-12-22 CN CN202111581587.6A patent/CN114210930A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2095081A1 (en) * | 1992-05-14 | 1993-11-15 | Alan Peter Druschitz | Mold for Producing Thin Wall Castings by Gravity Pouring |
| DE19627930A1 (en) * | 1996-07-11 | 1998-01-15 | Otmar Fahrion | Adjustable mold and device for adjusting the shape of such a surface |
| CN102489667A (en) * | 2011-12-16 | 2012-06-13 | 十堰市泰祥实业有限公司 | Casting method for spheroidal graphite cast iron main bearing cap of gasoline engine and casting mould applying same |
| CN104985128A (en) * | 2015-07-22 | 2015-10-21 | 湖北亚钢金属制造有限公司 | Multi-overlaid-layer gating system and technology for casting |
| CN106001446A (en) * | 2016-08-09 | 2016-10-12 | 十堰市泰祥实业股份有限公司 | Method and mold for producing passenger car engine single-chip main bearing cover |
| CN106392012A (en) * | 2016-09-26 | 2017-02-15 | 侯马市东鑫机械铸造有限公司 | Design method for nodular cast iron crankshaft curved face parting mold |
| CN213256969U (en) * | 2020-08-31 | 2021-05-25 | 天津铸星金属制品有限公司 | Novel investment casting sand shell is dry device |
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