CN108971432B - Crankshaft riser method easy to fall off and free of polishing - Google Patents
Crankshaft riser method easy to fall off and free of polishing Download PDFInfo
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- CN108971432B CN108971432B CN201811011640.7A CN201811011640A CN108971432B CN 108971432 B CN108971432 B CN 108971432B CN 201811011640 A CN201811011640 A CN 201811011640A CN 108971432 B CN108971432 B CN 108971432B
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- crankshaft
- casting
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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
- B22C9/088—Feeder heads
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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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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to a method for manufacturing a crankshaft riser which is easy to fall off and free of polishing, which adopts the following means when manufacturing a crankshaft casting: (1) calculating the required closure area of the crankshaft type casting; (2) the riser neck is in an isosceles trapezoid shape, the bottom height ratio is within 1, and the area of the riser neck is 3.5 times of the interception area; (3) the angle between the riser neck and the casting is 100-130 degrees. By adopting the method, the riser of the crankshaft type casting automatically falls off and is free from polishing by changing the shape of the riser neck, so that the casting body is prevented from being damaged while labor is saved.
Description
Technical Field
The invention relates to the field of casting, in particular to a manufacturing method of a crankshaft riser which is easy to fall off and free of grinding.
Background
At present in the foundry industry field, compressor bent axle class foundry goods are because the reason of technology, and the rising head is connected closely with the bent axle, and the work of pounding the rising head needs the manual work to carry out in the aftertreatment stage for rising head and bent axle separation still have the rising head remaining on the bent axle after the separation, need the manual work to polish and handle, make the remaining height of rising head less than within 0.76mm, both consumed a large amount of time, also damaged the bent axle foundry goods easily.
Disclosure of Invention
The invention aims to provide a crankshaft riser method which is easy to fall off and free of grinding.
The technical means adopted by the invention are as follows: a manufacturing method of a crankshaft riser which is easy to fall off and free of polishing adopts the following means when a crankshaft casting is manufactured:
(1) calculating the required interception area meeting the requirement of crankshaft castings, wherein the following formula is adopted:
f is the cut-off area (mm)2)；
k is a constant 1036;
g is the weight (kg) of molten iron passing through the intercepting area;
m is a loss factor, and a constant is determined by the shape and the size of the interception part;
t is the pouring time;
h is the metallostatic height, unit mm, and is the distance from the gravity center of the casting to the top of the mould template;
m is 0.3, t is 6 s;
when a plurality of castings are arranged on the template, H is the minimum value;
(2) the riser neck is in an isosceles trapezoid shape, the bottom height ratio is within 1, and the area of the riser neck is 3.5 times of the interception area;
(3) the angle between the riser neck and the casting is 100-130 degrees;
after the crankshaft casting passes through the roller and the shot blasting, the dead head and the casting are completely separated.
The invention has the beneficial effects that:
1. the method is simple to operate, and the production efficiency can be improved by changing the process design.
2. Through changing the shape of the riser neck, the riser of the crankshaft casting is convenient to automatically fall off and is free from polishing.
3. The work of smashing and polishing a dead head is not needed manually, so that the damage to the casting body is avoided while the labor is saved.
Drawings
FIG. 1 is a schematic cross-sectional view of a riser and a riser neck according to an embodiment of the present invention.
Fig. 2 is a schematic side view of a crankshaft and a riser according to an embodiment of the present invention.
Detailed Description
The invention provides a method for manufacturing a crankshaft riser which is easy to fall off and free of polishing, wherein when a crankshaft casting of a compressor is manufactured, a riser A is connected with a crankshaft B, and the method is characterized in that the following means are adopted when the crankshaft casting is manufactured:
(1) calculating the required interception area meeting the requirement of crankshaft castings, wherein the following formula is adopted:
f is the cut-off area (mm)2)；
k is a constant 1036;
g is the weight (kg) of molten iron passing through the intercepting area;
m is a loss factor, and a constant is determined by the shape and the size of the interception part;
t is the pouring time;
h is the metallostatic (average) height, unit mm is the distance from the gravity center of the casting to the top of the mould template, and when a plurality of castings are arranged on the template, the minimum value of H is taken;
(2) the shape of the riser neck A' is isosceles trapezoid, the height ratio of the bottom is within 1, as shown in figure 1, the bottom comprises an upper bottom 1 and a lower bottom 2, the ratio of the height to the height is within 1, and the area of the riser neck is 3.5 times of the cut-off area;
(3) the angle R between the riser neck and the casting is 90-130 as shown in fig. 2.
Preferably, m is 0.3 and t is 6 s.
The following are specific examples.
The first embodiment is as follows:
the weight of the crankshaft casting A is 0.21kg, and the required cutoff area is 35mm after the weight is calculated by a pouring system formula2；
The shape of the riser neck is isosceles trapezoid, the lower bottom is 6mm, the upper bottom is 4mm, and the height is 7 mm;
thirdly, the angle between the riser neck and the casting is designed to be 100 degrees.
Tracking during production, wherein after the crankshaft casting A passes through a roller and shot blasting, a riser is completely separated from the casting, 10 pieces of residual heights of the riser are extracted and measured, and the following results are obtained:
0.51mm, 0.34mm, 0.52mm, 0.70mm, 0.28mm, 0.34mm, 0.48mm, 0.66mm, 0.53mm and 0.47mm, and the residual height is less than 0.76mm, without manual polishing treatment.
Example two:
an X crankshaft:
the weight of the crankshaft casting X is 0.45kg, and the required area is about 70mm after the weight is calculated by a pouring system formula2；
The shape of the riser neck is isosceles trapezoid, the lower bottom is 8mm, the upper bottom is 6mm, and the height is 10 mm;
and the angle between the riser neck and the casting is designed to be about 120 degrees.
Tracking during production, wherein after the crankshaft casting X passes through a roller and shot blasting, a riser is completely separated from the casting, 10 pieces of residual heights of the riser are extracted, and the following results are obtained:
0.37mm, 0.16mm, 0.61mm, 0.58mm, 0.32mm, 0.26mm, 0.45mm, 0.26mm, 0.33mm, 0.33mm, the residual height is less than 0.76mm, and manual polishing treatment is not needed.
Example three:
BE crankshaft: the related part of the riser neck during process design:
the weight of the crankshaft casting BE is 0.46kg, and the required area is about 71mm after the weight is calculated through a pouring system formula2；
The shape of the riser neck is isosceles trapezoid, the lower bottom is 8mm, the upper bottom is 6mm, and the height is 10 mm;
and thirdly, the angle between the riser neck and the casting is designed to be about 107 degrees.
Tracking during production, wherein after the crankshaft casting BE passes through a roller and shot blasting, a dead head is completely separated from the casting, 10 pieces of dead head residual height are extracted, and the following results are obtained:
0.41mm, 0.45mm, 0.59mm, 0.46mm, 0.13mm, 0.56mm, 0.68mm, 0.59mm, 0.57mm and 0.35mm, and the residual height is less than 0.76mm, without manual polishing treatment.
Claims (1)
1. The manufacturing method of the crankshaft riser which is easy to fall off and free of grinding is characterized in that the following means are adopted when a crankshaft casting is manufactured:
(1) calculating the required interception area meeting the requirement of crankshaft castings, wherein the following formula is adopted:
f is the cut-off area in mm2；
k is a constant 1036;
g is the weight of the molten iron passing through the interception area, and the unit is kg;
m is a loss factor, and a constant is determined by the shape and the size of the interception part;
t is the pouring time;
h is the metallostatic height, unit mm, and is the distance from the gravity center of the casting to the top of the mould template;
m is 0.3, t is 6 s;
when a plurality of castings are arranged on the template, H is the minimum value;
(2) the riser neck is in an isosceles trapezoid shape, the bottom height ratio is within 1, and the area of the riser neck is 3.5 times of the interception area;
(3) the angle between the riser neck and the casting is 100-130 degrees;
after the crankshaft casting passes through the roller and the shot blasting, the dead head and the casting are completely separated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811011640.7A CN108971432B (en) | 2018-08-31 | 2018-08-31 | Crankshaft riser method easy to fall off and free of polishing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811011640.7A CN108971432B (en) | 2018-08-31 | 2018-08-31 | Crankshaft riser method easy to fall off and free of polishing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108971432A CN108971432A (en) | 2018-12-11 |
| CN108971432B true CN108971432B (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811011640.7A Active CN108971432B (en) | 2018-08-31 | 2018-08-31 | Crankshaft riser method easy to fall off and free of polishing |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CS271015B1 (en) * | 1988-03-30 | 1990-08-14 | Pavel Hornsteiner | Method of risers separation from casting's surface and equipment for its realization |
| JP3153991B2 (en) * | 1997-10-01 | 2001-04-09 | 正光 三木 | Feeder sleeve |
| CN201702325U (en) * | 2010-05-14 | 2011-01-12 | 六和铸造工业(昆山)有限公司 | Heat-insulating feeder head |
| CN103203430B (en) * | 2012-01-17 | 2015-11-11 | 林州重机铸锻有限公司 | Ledge casting technique |
| CN203875283U (en) * | 2014-05-04 | 2014-10-15 | 天津凯星科技有限公司 | Riser sleeve assembly mounting structure |
| CN205289657U (en) * | 2016-01-15 | 2016-06-08 | 山东惠宇精密机械有限公司 | Brake disc casting mould |
-
2018
- 2018-08-31 CN CN201811011640.7A patent/CN108971432B/en active Active
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| CN108971432A (en) | 2018-12-11 |
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