CN113042712A - Indirect chill for preventing shrinkage porosity of nodular cast iron pressure plate groove and processing technology thereof - Google Patents
Indirect chill for preventing shrinkage porosity of nodular cast iron pressure plate groove and processing technology thereof Download PDFInfo
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- CN113042712A CN113042712A CN201911368601.7A CN201911368601A CN113042712A CN 113042712 A CN113042712 A CN 113042712A CN 201911368601 A CN201911368601 A CN 201911368601A CN 113042712 A CN113042712 A CN 113042712A
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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
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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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
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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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
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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Abstract
The invention discloses an indirect chilling block for preventing a nodular cast iron pressure plate groove from shrinkage porosity and a processing technology thereof, and the indirect chilling block comprises a chilling block body, a die bottom plate and a pressure plate groove, wherein the pressure plate groove is positioned on the lower end surface of the die bottom plate, a through hole is formed in the chilling block body, a support rod is arranged in the through hole, the chilling block body is of a structure with a large upper part and a small lower part, and the front end surface and the rear end surface of the chilling block body form an included angle of 15 degrees with a vertical plane. According to the invention, the through hole is formed in the chiller body, the supporting rod is arranged in the through hole, and the front end face and the rear end face of the chiller body form an included angle of 15 degrees with the resin plane, so that the design has the advantages that: the indirect chilling block can be placed on the front side and the back side of the casting, and the chilling block cannot sink into the casting when the molding sand collapses during pouring.
Description
Technical Field
The invention relates to the technical field of die casting, in particular to an indirect chill for preventing a nodular cast iron pressure plate groove from shrinkage porosity and a processing technology thereof.
Background
The chilling block is a chilling object arranged on the surface, inside or in an important processing groove of the die for accelerating the local cooling speed of the casting. The chilling block is matched with a pouring system and a riser system for use, and the solidification sequence of the casting is controlled to obtain a qualified casting. The chill is divided into direct chill and indirect chill, and the chill which is directly contacted with the model is called direct chill when the chill is placed on the surface of the model during modeling. The shape surface of the direct chill needs to be consistent with the shape of the surface to be cooled, no gap exists between the chill and the surface to be cooled, and the direct chill cannot be reused. The indirect chilling block is not directly contacted with the casting, 10-15 mm of resin sand is arranged between the chilling block and the casting, the resin sand is compacted during molding, air in the sand is discharged, the defects of shrinkage porosity, shrinkage cavity and the like caused when the air enters the casting are prevented, the indirect chilling block has low requirement on the shape of the chilling block, and the indirect chilling block can be repeatedly used.
The common indirect chilling blocks are mostly cuboid iron blocks, and if the indirect chilling blocks are placed on the bottom surface of a casting for use, the chilling blocks and the casting moulding sand collapse during pouring, and the chilling blocks can sink into the casting, so that the chilling blocks are difficult to separate from the casting.
Disclosure of Invention
The invention aims to solve the problem that the conventional chilling block is easy to sink into a casting, and provides an indirect chilling block for preventing a nodular cast iron pressure plate groove from shrinkage porosity and a processing technology thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an indirect chill for preventing nodular cast iron clamp plate groove shrinkage porosity, includes chill body, mould bottom plate and clamp plate groove, the clamp plate trench is located the lower terminal surface of mould bottom plate, the through-hole has been seted up to the inside of chill body, the inside of through-hole is equipped with the bracing piece, the chill body is big-end-up's structure to two terminal surfaces all have 15 contained angles with vertical plane around it.
As a further description of the above technical solution:
the support rod is in transition fit with the through hole.
As a further description of the above technical solution:
and the upper side and the lower side of the pressing plate groove are both provided with a chilling block body.
As a further description of the above technical solution:
the processing technology of the indirect chilling block for preventing the shrinkage porosity of the nodular cast iron pressure plate groove comprises the following steps:
s1, batching: the weight percentages of the components of the cold iron body are as follows: 1.5 to 2.0 percent of silicon; 0.4 to 0.7 percent of manganese; 0.3 to 0.6 percent of chromium; 0.26 to 0.58 percent of nickel; 0.25 to 0.55 percent of molybdenum; 0.01 to 0.05 percent of titanium, and the balance of scrap steel, pig iron and scrap returns, wherein the pig iron, the scrap returns and the scrap steel contain 3.2 to 3.7 percent of carbon in total weight;
s2 smelting: the method comprises the following steps:
a) feeding and melting: sequentially adding pig iron, foundry returns, scrap steel, chromium, nickel, molybdenum, titanium, manganese and silicon; putting the ingredients into a furnace to be melted into molten iron;
b) and (3) overheating and standing: heating the molten iron to 1530-1540 ℃, then cutting off heat and standing to 1450-1480 ℃;
c) inoculation: adding silicon and rare earth inoculation alloy replacing carbon equivalent, wherein the mass ratio of silicon to rare earth inoculation alloy is 0.3-0.4%, and the mass ratio of rare earth inoculation alloy is as follows: 0.2-0.3%, controlling the temperature of molten iron at 1390-;
s3 pouring: injecting molten iron with the temperature of 1380-1420 ℃ into a mould for molding;
s4 cooling and opening the mold, and taking out the chilling block.
As a further description of the above technical solution:
the material in step S1 further comprises 0.21-0.35 wt% of copper, and the copper is fed and melted between manganese and silicon.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, the through hole is formed in the chiller body, the supporting rod is arranged in the through hole, and the front end face and the rear end face of the chiller body form an included angle of 15 degrees with the resin plane, so that the design has the advantages that: the indirect chilling block can be placed on the front side and the back side of the casting, and the chilling block cannot sink into the casting when the molding sand collapses during pouring.
2. In the invention, the casting pressure plate groove is used for fixing the die and belongs to a safe part, so the performance requirement of the part is high, if the indirect chilling block is only arranged on the front side of the pressure plate groove, the generation of shrinkage porosity can not be reduced, and if the indirect chilling block is arranged on the front side and the back side of the pressure plate groove, the generation of shrinkage porosity can be reduced.
3. In the invention, the chilling block can be repeatedly used, thereby greatly reducing the production cost and improving the production efficiency, and can be used at special parts.
4. According to the invention, the microstructure of the chilling block body can be improved through the processing technology of the chilling block body, and the obtained chilling block has high hardness and better toughness, so that the mechanical property of the product can be improved, and the service life of the product can be prolonged.
Drawings
FIG. 1 is a schematic structural view of a chill and a platen slot according to the present invention;
FIG. 2 is a schematic front view of the chill of the present invention;
FIG. 3 is a schematic side view of the chiller according to the present invention.
Illustration of the drawings:
1. a chill body; 2. a support bar; 3. a mold base plate; 4. a platen slot; 5. and a through hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1-3, an indirect chill for preventing a ductile iron pressure plate groove from shrinkage porosity comprises a chill body 1, a mold bottom plate 3 and a pressure plate groove 4, wherein the pressure plate groove 4 is positioned on the lower end surface of the mold bottom plate 3, a through hole 5 is formed in the chill body 1, a support rod 2 is arranged in the through hole 5, the chill body 1 is of a structure with a large upper part and a small lower part, and the front end surface and the rear end surface of the chill body and a vertical plane form an included angle of 15 degrees; the support rod 2 is in transition fit with the through hole 5; the upper side and the lower side of the pressing plate groove 4 are both provided with a chilling block body 1;
a processing technology of indirect chilling block for preventing shrinkage porosity of a nodular cast iron pressure plate groove comprises the following steps:
s1, batching: the weight percentage of each component of the cold iron body 1 is as follows: 1.5% of silicon; 0.4 percent of manganese; 0.3 percent of chromium; 0.26% of nickel; 0.25% of molybdenum; 0.01 percent of titanium, and the balance of scrap steel, pig iron and scrap returns, wherein the pig iron, the scrap returns and the scrap steel contain 3.2 percent of carbon in total weight;
s2 smelting: the method comprises the following steps: a) feeding and melting: sequentially adding pig iron, foundry returns, scrap steel, chromium, nickel, molybdenum, titanium, manganese and silicon; putting the ingredients into a furnace to be melted into molten iron; b) and (3) overheating and standing: heating the molten iron to 1530-1540 ℃, then cutting off heat and standing to 1450-1480 ℃; c) inoculation: adding silicon and rare earth inoculation alloy replacing carbon equivalent, wherein the mass ratio of silicon to rare earth inoculation alloy is 0.3-0.4%, and the mass ratio of rare earth inoculation alloy is as follows: 0.2-0.3%, controlling the temperature of molten iron at 1390-;
s3 pouring: injecting molten iron with the temperature of 1380-1420 ℃ into a mould for molding;
s4, cooling and opening the die, and taking out the chilling block;
the material in step S1 further includes 0.21 wt% copper, which is melted between manganese and silicon.
Example two:
referring to fig. 1-3, an indirect chill for preventing a ductile iron pressure plate groove from shrinkage porosity comprises a chill body 1, a mold bottom plate 3 and a pressure plate groove 4, wherein the pressure plate groove 4 is positioned on the lower end surface of the mold bottom plate 3, a through hole 5 is formed in the chill body 1, a support rod 2 is arranged in the through hole 5, the chill body 1 is of a structure with a large upper part and a small lower part, and the front end surface and the rear end surface of the chill body and a vertical plane form an included angle of 15 degrees; the support rod 2 is in transition fit with the through hole 5; the upper side and the lower side of the pressing plate groove 4 are both provided with a chilling block body 1;
a processing technology of indirect chilling block for preventing shrinkage porosity of a nodular cast iron pressure plate groove comprises the following steps:
s1, batching: the weight percentage of each component of the cold iron body 1 is as follows: 1.55% of silicon; 0.45 percent of manganese; 0.35 percent of chromium; 0.32% of nickel; 0.31 percent of molybdenum; 0.02 percent of titanium, and the balance of scrap steel, pig iron and scrap returns, wherein the pig iron, the scrap returns and the scrap steel contain 3.2 to 3.7 percent of carbon in total weight;
s2 smelting: the method comprises the following steps: a) feeding and melting: sequentially adding pig iron, foundry returns, scrap steel, chromium, nickel, molybdenum, titanium, manganese and silicon; putting the ingredients into a furnace to be melted into molten iron; b) and (3) overheating and standing: heating the molten iron to 1530-1540 ℃, then cutting off heat and standing to 1450-1480 ℃; c) inoculation: adding silicon and rare earth inoculation alloy replacing carbon equivalent, wherein the mass ratio of silicon to rare earth inoculation alloy is 0.3-0.4%, and the mass ratio of rare earth inoculation alloy is as follows: 0.2-0.3%, controlling the temperature of molten iron at 1390-;
s3 pouring: injecting molten iron with the temperature of 1380-1420 ℃ into a mould for molding;
s4, cooling and opening the die, and taking out the chilling block;
the material in step S1 further includes 0.23 wt% copper, which is melted between manganese and silicon.
Example three:
referring to fig. 1-3, an indirect chill for preventing a ductile iron pressure plate groove from shrinkage porosity comprises a chill body 1, a mold bottom plate 3 and a pressure plate groove 4, wherein the pressure plate groove 4 is positioned on the lower end surface of the mold bottom plate 3, a through hole 5 is formed in the chill body 1, a support rod 2 is arranged in the through hole 5, the chill body 1 is of a structure with a large upper part and a small lower part, and the front end surface and the rear end surface of the chill body and a vertical plane form an included angle of 15 degrees; the support rod 2 is in transition fit with the through hole 5; the upper side and the lower side of the pressing plate groove 4 are both provided with a chilling block body 1;
a processing technology of indirect chilling block for preventing shrinkage porosity of a nodular cast iron pressure plate groove comprises the following steps:
s1, batching: the weight percentage of each component of the cold iron body 1 is as follows: 1.6% of silicon; 0.5 percent of manganese; 0.4 percent of chromium; 0.41 percent of nickel; 0.42 percent of molybdenum; 0.03 percent of titanium, and the balance of scrap steel, pig iron and scrap returns, wherein the pig iron, the scrap returns and the scrap steel contain 3.2 to 3.7 percent of carbon in total weight;
s2 smelting: the method comprises the following steps: a) feeding and melting: sequentially adding pig iron, foundry returns, scrap steel, chromium, nickel, molybdenum, titanium, manganese and silicon; putting the ingredients into a furnace to be melted into molten iron; b) and (3) overheating and standing: heating the molten iron to 1530-1540 ℃, then cutting off heat and standing to 1450-1480 ℃; c) inoculation: adding silicon and rare earth inoculation alloy replacing carbon equivalent, wherein the mass ratio of silicon to rare earth inoculation alloy is 0.3-0.4%, and the mass ratio of rare earth inoculation alloy is as follows: 0.2-0.3%, controlling the temperature of molten iron at 1390-;
s3 pouring: injecting molten iron with the temperature of 1380-1420 ℃ into a mould for molding;
s4, cooling and opening the die, and taking out the chilling block;
the material at step S1 further includes 0.26 wt% copper, which is melted between manganese and silicon.
Example four:
referring to fig. 1-3, an indirect chill for preventing a ductile iron pressure plate groove from shrinkage porosity comprises a chill body 1, a mold bottom plate 3 and a pressure plate groove 4, wherein the pressure plate groove 4 is positioned on the lower end surface of the mold bottom plate 3, a through hole 5 is formed in the chill body 1, a support rod 2 is arranged in the through hole 5, the chill body 1 is of a structure with a large upper part and a small lower part, and the front end surface and the rear end surface of the chill body and a vertical plane form an included angle of 15 degrees; the support rod 2 is in transition fit with the through hole 5; the upper side and the lower side of the pressing plate groove 4 are both provided with a chilling block body 1;
a processing technology of indirect chilling block for preventing shrinkage porosity of a nodular cast iron pressure plate groove comprises the following steps:
s1, batching: the weight percentage of each component of the cold iron body 1 is as follows: 1.8% of silicon; 0.6 percent of manganese; 0.5 percent of chromium; 0.5 percent of nickel; 0.5 percent of molybdenum; 0.04 percent of titanium, and the balance of scrap steel, pig iron and scrap returns, wherein the pig iron, the scrap returns and the scrap steel contain 3.2 to 3.7 percent of carbon in total weight;
s2 smelting: the method comprises the following steps: a) feeding and melting: sequentially adding pig iron, foundry returns, scrap steel, chromium, nickel, molybdenum, titanium, manganese and silicon; putting the ingredients into a furnace to be melted into molten iron; b) and (3) overheating and standing: heating the molten iron to 1530-1540 ℃, then cutting off heat and standing to 1450-1480 ℃; c) inoculation: adding silicon and rare earth inoculation alloy replacing carbon equivalent, wherein the mass ratio of silicon to rare earth inoculation alloy is 0.3-0.4%, and the mass ratio of rare earth inoculation alloy is as follows: 0.2-0.3%, controlling the temperature of molten iron at 1390-;
s3 pouring: injecting molten iron with the temperature of 1380-1420 ℃ into a mould for molding;
s4, cooling and opening the die, and taking out the chilling block;
the material at step S1 further includes 0.3 wt% copper, which is melted between manganese and silicon.
Example five:
referring to fig. 1-3, an indirect chill for preventing a ductile iron pressure plate groove from shrinkage porosity comprises a chill body 1, a mold bottom plate 3 and a pressure plate groove 4, wherein the pressure plate groove 4 is positioned on the lower end surface of the mold bottom plate 3, a through hole 5 is formed in the chill body 1, a support rod 2 is arranged in the through hole 5, the chill body 1 is of a structure with a large upper part and a small lower part, and the front end surface and the rear end surface of the chill body and a vertical plane form an included angle of 15 degrees; the support rod 2 is in transition fit with the through hole 5; the upper side and the lower side of the pressing plate groove 4 are both provided with a chilling block body 1;
a processing technology of indirect chilling block for preventing shrinkage porosity of a nodular cast iron pressure plate groove comprises the following steps:
s1, batching: the weight percentage of each component of the cold iron body 1 is as follows: 2.0% of silicon; 0.7 percent of manganese; 0.6 percent of chromium; 0.58% of nickel; 0.55 percent of molybdenum; 0.05 percent of titanium, and the balance of scrap steel, pig iron and scrap returns, wherein the pig iron, the scrap returns and the scrap steel contain 3.2 to 3.7 percent of carbon in total weight;
s2 smelting: the method comprises the following steps: a) feeding and melting: sequentially adding pig iron, foundry returns, scrap steel, chromium, nickel, molybdenum, titanium, manganese and silicon; putting the ingredients into a furnace to be melted into molten iron; b) and (3) overheating and standing: heating the molten iron to 1530-1540 ℃, then cutting off heat and standing to 1450-1480 ℃; c) inoculation: adding silicon and rare earth inoculation alloy replacing carbon equivalent, wherein the mass ratio of silicon to rare earth inoculation alloy is 0.3-0.4%, and the mass ratio of rare earth inoculation alloy is as follows: 0.2-0.3%, controlling the temperature of molten iron at 1390-;
s3 pouring: injecting molten iron with the temperature of 1380-1420 ℃ into a mould for molding;
s4, cooling and opening the die, and taking out the chilling block;
the material at step S1 further includes 0.35 wt% copper, which is melted between manganese and silicon.
The chills produced by the above examples one to five were used to cool the castings, and the casting cooling rates shown in table one were obtained:
watch-casting cooling speedometer
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The utility model provides a prevent indirect chill of nodular cast iron clamp plate groove shrinkage porosity, includes chill body (1), mould bottom plate (3) and clamp plate groove (4), its characterized in that, clamp plate groove (4) are located the lower terminal surface of mould bottom plate (3), through-hole (5) have been seted up to the inside of chill body (1), the inside of through-hole (5) is equipped with bracing piece (2), chill body (1) is big-end-up's structure to two terminal surfaces all have 15 contained angles with vertical plane around it.
2. The indirect chill for preventing shrinkage porosity of a ductile iron pressure plate groove according to claim 1, wherein the support rod (2) is transition-fitted with the through hole (5).
3. The indirect chiller for preventing the shrinkage porosity of a nodular cast iron pressure plate groove according to claim 1, characterized in that the chiller body (1) is arranged on the upper side and the lower side of the pressure plate groove (4).
4. The machining process of the indirect chilling block for preventing the shrinkage porosity of the nodular cast iron pressure plate groove as claimed in claim 1, is characterized by comprising the following steps:
s1, batching: the weight percentages of the components of the cold iron body (1) are as follows: 1.5 to 2.0 percent of silicon; 0.4 to 0.7 percent of manganese; 0.3 to 0.6 percent of chromium; 0.26 to 0.58 percent of nickel; 0.25 to 0.55 percent of molybdenum; 0.01 to 0.05 percent of titanium, and the balance of scrap steel, pig iron and scrap returns, wherein the pig iron, the scrap returns and the scrap steel contain 3.2 to 3.7 percent of carbon in total weight;
s2 smelting: the method comprises the following steps:
a) feeding and melting: sequentially adding pig iron, foundry returns, scrap steel, chromium, nickel, molybdenum, titanium, manganese and silicon; putting the ingredients into a furnace to be melted into molten iron;
b) and (3) overheating and standing: heating the molten iron to 1530-1540 ℃, then cutting off heat and standing to 1450-1480 ℃;
c) inoculation: adding silicon and rare earth inoculation alloy replacing carbon equivalent, wherein the mass ratio of silicon to rare earth inoculation alloy is 0.3-0.4%, and the mass ratio of rare earth inoculation alloy is as follows: 0.2-0.3%, controlling the temperature of molten iron at 1390-;
s3 pouring: injecting molten iron with the temperature of 1380-1420 ℃ into a mould for molding;
s4 cooling and opening the mold, and taking out the chilling block.
5. The process of claim 4, wherein the step S1 further comprises the step of adding 0.21-0.35 wt% of copper, wherein the copper is melted between manganese and silicon.
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| CN201911368601.7A CN113042712A (en) | 2019-12-26 | 2019-12-26 | Indirect chill for preventing shrinkage porosity of nodular cast iron pressure plate groove and processing technology thereof |
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| CN201911368601.7A CN113042712A (en) | 2019-12-26 | 2019-12-26 | Indirect chill for preventing shrinkage porosity of nodular cast iron pressure plate groove and processing technology thereof |
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| CN102274942A (en) * | 2011-08-23 | 2011-12-14 | 江苏技术师范学院 | Indirect chilling block and processing and positioning methods thereof |
| CN102424930A (en) * | 2011-12-01 | 2012-04-25 | 宜宾常达机械有限公司 | Manufacturing technology for chilled cast iron part |
| CN104785715A (en) * | 2014-04-30 | 2015-07-22 | 天津虹冈铸钢有限公司 | Casting method capable of preventing coarse graphite on surface of convex model |
| CN106825407A (en) * | 2016-12-22 | 2017-06-13 | 常州中车汽车零部件有限公司 | A kind of sand mold manufactures component and casting method |
| CN107598085A (en) * | 2017-08-28 | 2018-01-19 | 芜湖泓鹄材料技术有限公司 | The manufacture method of iron base plate |
| CN207547606U (en) * | 2017-10-18 | 2018-06-29 | 潍柴重机股份有限公司 | A kind of sand casting chill fixing device |
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2019
- 2019-12-26 CN CN201911368601.7A patent/CN113042712A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102274942A (en) * | 2011-08-23 | 2011-12-14 | 江苏技术师范学院 | Indirect chilling block and processing and positioning methods thereof |
| CN102424930A (en) * | 2011-12-01 | 2012-04-25 | 宜宾常达机械有限公司 | Manufacturing technology for chilled cast iron part |
| CN104785715A (en) * | 2014-04-30 | 2015-07-22 | 天津虹冈铸钢有限公司 | Casting method capable of preventing coarse graphite on surface of convex model |
| CN106825407A (en) * | 2016-12-22 | 2017-06-13 | 常州中车汽车零部件有限公司 | A kind of sand mold manufactures component and casting method |
| CN107598085A (en) * | 2017-08-28 | 2018-01-19 | 芜湖泓鹄材料技术有限公司 | The manufacture method of iron base plate |
| CN207547606U (en) * | 2017-10-18 | 2018-06-29 | 潍柴重机股份有限公司 | A kind of sand casting chill fixing device |
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