CN207914537U - A kind of profile-followed hot core box mould for extending film covered sand core exhaust passage - Google Patents
A kind of profile-followed hot core box mould for extending film covered sand core exhaust passage Download PDFInfo
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- CN207914537U CN207914537U CN201820286379.0U CN201820286379U CN207914537U CN 207914537 U CN207914537 U CN 207914537U CN 201820286379 U CN201820286379 U CN 201820286379U CN 207914537 U CN207914537 U CN 207914537U
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- sand core
- breather plug
- cavity
- exhaust passage
- dynamic model
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Abstract
The utility model discloses a kind of profile-followed hot core box moulds for extending film covered sand core exhaust passage, hot core box mould includes quiet mould punch-pin and dynamic model cavity plate, the cavity for controlling sand core shape is equipped between quiet mould punch-pin and dynamic model cavity plate, cavity is divided into quiet mould punch-pin cavity and dynamic model concave die cavity, the dynamic model concave die cavity is provided with multiple breather plugs with the shape on surface, breather plug interference is mounted on mold cavity surface, and perpendicular to mold cavity surface and equal therewith.The utility model by being arranged at least one breather plug and venthole on the mold cavity surface at thicker big sand core position with the shape, with air gun into venthole blowing compressed air, the sand core internal greensand at thicker big position at breather plug is set gradually to produce by boasting in order from exhaust passage mouth, extend sand core exhaust passage with the shape, reduce the gas forming amount of film covered sand core, smooth gas discharge is smooth, reduces bleb, cinder hole defect, improves finished product rate.
Description
Technical field
The utility model is related to a kind of molding die technical field of film covered sand core, specially a kind of profile-followed extension precoated sand
The hot core box mould of core exhaust passage.
Background technology
Automobile turbocharger turbine case casting structure is complex, is in single, double runner three-dimension curved surface streamline construction, weight
Several kilograms to tens kilograms, the main wall thickness 4-5mm of volute, and wall thickness became uneven, thermal center lug is more, and casting quality requires height,
It is not allow for any casting flaw.Especially runner position surface quality and dimension precision requirement are especially high.In casting pouring mistake
Cheng Zhong is in due to turbine case runner core in the encirclement of molten metal, can be with the resin in precoated sand after molten metal and sand core contact
Equal organic matters, which react, generates gas, and thick big position is since inside is there are greensand, then gas forming amount can bigger, runner core in addition
Exhaust passage is not smooth, considerably increases the defective proportion that runner position generates stomata, cinder hole in this way.
The production method of turbine case casting is shell moulded casting and precoated sand involucrum tide mould sand production technology both at home and abroad at present.One
As turbine case runner core made of the precoated sand and hot box shell core machine of high intensity, it is desirable that runner core sand wicking surface quality is high,
Dimensional accuracy is high, and runner core keeps certain cured thickness and use intensity, inside empty into cavity structure as far as possible, reduce
Then the gas forming amount of sand core fills the materials such as dry former silica sand in cavity, ensures sand core quality and casting quality.
General turbine case runner core is produced using the hot box shell core machine of vertical-parting, is penetrated sand mouth and is arranged in runner mouth or row
At gas passway.By precoated sand（Sand grain surface is covered with the dry mixture of one layer of solid phenolic resin film and curing agent）It is added to
In the hopper of shell core machine, dynamic model is molded with quiet mould, by compressed air and penetrates sand mouth by consolidation in precoated sand injection hot box, so
The electrical bar being arranged afterwards by hot box periphery is heating and curing overlay film layer of sand, when hot box mold cavity surface and sand core surface form one
When the certain thickness solidification shell of layer, hot box is overturn, the uncured greensand in the thick big position of sand core internal is poured out, is then turned over
It goes back to positive sand core to continue to cure, when sand core is heating and curing to some strength, sand core is taken out in die sinking, completes coremaking production process.
Overturning shell core machine is commonly used and makes runner core exhaust passage and cavity structure, by sand core shape and structure, sets
Standby condition limitation and hot box temperature, precoated sand curing process influence, and precoated sand selects the precoated sand of high intensity, exhaust logical
Road and re-entrant portion can only arrive the thick big position of runner core, be extremely difficult at turbine case circumference thicker position and far from penetrating sand mouth farther out
Place, to increase the gas forming amount of sand core, also influence sand core exhaust, cause sand core exhaust passage not smooth, casting meeting
Generate stomata, cinder hole defect.So how to make and extend the exhaust passage of sand core with the shape, sand core internal greensand is reduced, is prevented
Casting generates stomata, cinder hole defect, becomes our companies capture one big technical barrier.
Utility model content
The purpose of this utility model is to provide a kind of profile-followed hot core box moulds for extending film covered sand core exhaust passage, with solution
Certainly the problems mentioned above in the background art.
To achieve the above object, the utility model provides the following technical solutions：A kind of profile-followed extension film covered sand core exhaust is logical
The hot core box mould in road, including quiet mould punch-pin and dynamic model cavity plate are equipped between the quiet mould punch-pin and dynamic model cavity plate for controlling
The cavity of sand core shape, cavity are divided into quiet mould punch-pin cavity and dynamic model concave die cavity, profile-followed on dynamic model concave die cavity surface
Multiple breather plugs, respectively the first breather plug, the second breather plug, third breather plug are provided with, first breather plug, second are led to
Vent plug, third breather plug interference are mounted on mold cavity surface, and perpendicular to mold cavity surface and equal therewith.
Preferably, first breather plug, the second breather plug, third breather plug installation pore size are less than breather plug size,
And there are interference fit gap 0.1mm, corresponding vent size is less than installation pore size 2-3mm.
Preferably, the film covered sand core exhaust passage be made by the first breather plug being arranged with the shape, second ventilation
Plug, third breather plug and the first venthole, the second venthole, third venthole air gun to sand core internal blowing compressed air and are pressed
Order gradually produces by boasting greensand from exhaust passage mouth, and compressed air pressure is controlled in 0.4-0.5MPa.
Preferably, a kind of profile-followed sand core forming method for extending film covered sand core exhaust passage, comprises the steps of：
1）Quiet mould punch-pin cavity, exhaust duct are opened up on the quiet mould punch-pin of hot box, install more electrical bars, positioning pin and top additional
The quiet mould such as bar, fixed plate ejects resetting structure；Dynamic model concave die cavity is opened up on hot box dynamic model cavity plate, penetrates Sha Kou, is first logical
Stomata, the second venthole, third venthole install the ejections such as the second electrical bar, set pin sleeve and mandril, fixed plate additional and reset knot
Structure；
2）The precoated sand for selecting high intensity, precoated sand is added in the sand hopper of hot box shell core machine；
3）The quiet mould punch-pin of hot box and dynamic model cavity plate are mounted on shell core machine, and adjust molding in place；
4）Mobile dynamic model cavity plate makes dynamic model cavity plate and quiet mould punch-pin mold, using the first electrical bar and the second electrical bar to dynamic
Mould cavity plate and quiet mould punch-pin are heated, and heating and temperature control is between 200-250 DEG C；
5）Releasing agent is sprayed in the mold cavity surface of dynamic model cavity plate and quiet mould punch-pin, sand is penetrated in molding, and penetrating sand compressed air pressure is
0.6MPa, gassing time 2s, by the effect of compressed air, by the core sand consolidation in hot box；
6）It is heating and curing, sand core starts to crust, investing time 30-50s, overturns 180 ° from 30s rear molds, precoated sand solidification
Temperature i.e. the first electrical bar and the second electrical bar keep setting to determine heating temperature between 200-250 DEG C；
7）Die flip shakes sand, and the uncured greensand in thick big position at sand core head is poured out with gravity,
The breather plug, the second breather plug, third breather plug and the first venthole that are arranged with the shape by dynamic model cavity plate simultaneously, the second ventilation
Hole, third venthole according to from penetrate the sequence of sand mouth or exhaust passage mouth from the near to the distant gradually open compressed air with air gun will be compared with
Greensand in thick big sand core is produced by boasting, and sand core exhaust passage is extended, and blow gas pressure 0.4-0.5MPa overturns the time of falling sand
For 10s；
8）Die flip returns just, continues to cure 80s；
9）Die sinking, dynamic model cavity plate ejecting mechanism eject sand core, manually take out sand core；
10）Profile-followed exhaust passage in sand core is modified with air gun or other tools, roughing sand coarse sand is then filled, is used in combination
Alcohol precoated sand seals, then coats, toasts and obtain film covered sand core finished product.
Compared with prior art, the utility model has the beneficial effects that：
The utility model by be arranged with the shape multiple breather plugs on the mold cavity surface at thicker big sand core position and
Venthole, with air gun into venthole blowing compressed air, make the sand core internal greensand at the thicker big precoated sand position of breather plug in due order
Sequence is gradually produced by boasting from exhaust passage mouth, extends the exhaust passage of sand core with the shape, reduces the gas forming amount of film covered sand core, favorably
In exhaust and smooth gas discharge it is smooth, reduce bleb, cinder hole defect, improve finished product rate.
Description of the drawings
Fig. 1 is the schematic cross-sectional view of film covered sand core in the utility model.
Fig. 2 is the main view diagrammatic cross-section of hot box die sinking dynamic model in the utility model.
Fig. 3 is the top cross-sectional view that hot box molds in the utility model.
Fig. 4 is the schematic front view of hot box dynamic model in the utility model.
Fig. 5 is the schematic cross-sectional view of film covered sand core in the prior art.
In figure：1-sand core, 2-quiet mould punch-pin, 3-dynamic model cavity plates, 4a-breather plug, 4b-breather plug, 4c-ventilation
Sha Kou, 21-quiet mould electrical bars, 22-exhaust ducts, 23-positioning pins, 25-are penetrated in plug, 11-core prints, 12-exhaust passages, 13-
Quiet mould ejection resetting structure, 31-dynamic model electrical bars, 32a-venthole, 32b-venthole, 32c-venthole, 33-positioning
Guide, 34-dynamic model concave die cavities, 35-dynamic die liftout resetting structures.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
- 4 are please referred to Fig.1, the utility model provides a kind of technical solution：It is a kind of profile-followed to extend film covered sand core exhaust passage
Hot core box mould, including quiet mould punch-pin 2 and dynamic model cavity plate 3 are equipped between the quiet mould punch-pin 2 and dynamic model cavity plate 3 for controlling
The cavity of 1 shape of sand core, cavity are divided into quiet mould punch-pin cavity and dynamic model concave die cavity 34, on 3 mold cavity surface of dynamic model cavity plate
It is provided with multiple breather plugs with the shape, respectively the first breather plug 4a, the second breather plug 4b, third breather plug 4c, described first is logical
Vent plug 4a, the second breather plug 4b, third breather plug 4c interference are mounted on mold cavity surface, and perpendicular to mold cavity surface and therewith
It is equal；The first electrical bar 21 and the second electrical bar 31 is arranged in the cavity periphery of quiet mould punch-pin 2 and dynamic model cavity plate 3.
In the utility model, the first breather plug 4a, the second breather plug 4b, third breather plug 4c installation pore sizes are less than ventilation
Clearance gauge cun, and there are interference fit gap 0.1mm, corresponding vent size is less than installation pore size 2-3mm；First is logical
Vent plug 4a, the second breather plug 4b, third breather plug 4c, are cylindrical hollow structure, and ventilation device is strip or netted；Described first
Breather plug 4a, the second breather plug 4b, third breather plug 4c are made of copper alloy or stainless steel material；Film covered sand core exhaust passage
It is made by the first breather plug 4a being arranged with the shape, the second breather plug 4b, third breather plug 4c and the first venthole 32a,
Two venthole 32b, third venthole 32c air guns are to sand core internal blowing compressed air and gradually logical from exhaust by greensand in order
12 mouthfuls of road is produced by boasting, and compressed air pressure is controlled in 0.4-0.5MPa.
In the utility model, a kind of profile-followed sand core forming method for extending film covered sand core exhaust passage, by following steps group
At：
1）Quiet mould punch-pin cavity, exhaust duct 22 are opened up on the quiet mould punch-pin of hot box 2, install more electrical bars 21, positioning additional
The quiet mould such as pin 23 and mandril, fixed plate ejects resetting structure 25；Opened up on hot box dynamic model cavity plate 3 dynamic model concave die cavity 25,
Sand mouth 13, the first venthole 32a, the second venthole 32b, third venthole 32c are penetrated, installs the second electrical bar 31, set pin sleeve additional
33 and mandril, fixed plate etc. eject resetting structure 35；
2）The precoated sand for selecting high intensity, precoated sand is added in the sand hopper of hot box shell core machine；
3）The quiet mould punch-pin 2 of hot box and dynamic model cavity plate 3 are mounted on shell core machine, and adjust molding in place；
4）Mobile dynamic model cavity plate 3 makes dynamic model cavity plate 3 and quiet mould punch-pin 2 mold, and utilizes the first electrical bar 21 and the second electric heating
Stick 31 heats dynamic model cavity plate 3 and quiet mould punch-pin 2, and heating and temperature control is between 200-250 DEG C；
5）Releasing agent is sprayed in the mold cavity surface of dynamic model cavity plate 3 and quiet mould punch-pin 2, molding penetrates sand, penetrates sand compressed air pressure
For 0.6MPa, gassing time 2s, by the effect of compressed air, by the core sand consolidation in hot box, hardening；
6）It is heating and curing, sand core starts to crust, investing time 30-50s, overturns 180 ° from 30s rear molds, precoated sand solidification
Temperature i.e. the first electrical bar 21 and the second electrical bar 31 keep setting to determine heating temperature between 200-250 DEG C；
7）Die flip shakes sand, and the uncured greensand in thick big position at sand core head 11 is poured out with gravity
Come, while the breather plug 4a, the second breather plug 4b, the third breather plug 4c and first that are arranged with the shape by dynamic model cavity plate 3 ventilate
Hole 32a, the second venthole 32b, third venthole 32c according to from penetrate the sequence of 12 mouthfuls of sand mouth 13 or exhaust passage from the near to the distant by
Step opens compressed air with air gun and the greensand in thicker big sand core is produced by boasting, and extends sand core exhaust passage 12, pressure of blowing
Power is 0.4-0.5MPa, and the overturning time of falling sand is 10s；
8）Die flip returns just, continues to cure 80s；
9）Die sinking, 3 ejecting mechanism of dynamic model cavity plate eject sand core, manually take out sand core；
10）Profile-followed exhaust passage 12 in sand core is modified with air gun or other tools, then fills roughing sand coarse sand, and
It is sealed with alcohol precoated sand, then coats, toasts and obtain film covered sand core finished product.
Claims (3)
1. a kind of profile-followed hot core box mould for extending film covered sand core exhaust passage, including quiet mould punch-pin (2) and dynamic model cavity plate (3),
It is characterized in that：It is equipped between the quiet mould punch-pin (2) and dynamic model cavity plate (3) for controlling sand core（1）The cavity of shape, cavity
It is divided into quiet mould punch-pin cavity and dynamic model concave die cavity (34), is provided with the shape on dynamic model cavity plate (3) mold cavity surface multiple logical
Vent plug, respectively the first breather plug (4a), the second breather plug (4b), third breather plug (4c), first breather plug (4a),
Two breather plugs (4b), third breather plug (4c) interference are mounted on mold cavity surface, and perpendicular to mold cavity surface and equal therewith.
2. a kind of profile-followed hot core box mould for extending film covered sand core exhaust passage according to claim 1, it is characterised in that：
First breather plug (4a), the second breather plug (4b), third breather plug (4c) installation pore size are less than breather plug size, and stay
There are interference fit gap 0.1mm, corresponding vent size to be less than installation pore size 2-3mm.
3. a kind of profile-followed hot core box mould for extending film covered sand core exhaust passage according to claim 1, it is characterised in that：
The film covered sand core exhaust passage is made by the first breather plug (4a), the second breather plug (4b), third being arranged with the shape
Breather plug (4c) and the first venthole (32a), the second venthole (32b), third venthole (32c) are blown with air gun to sand core internal
Compressed air and in order gradually by greensand from exhaust passage（12）Mouth is produced by boasting, and the compressed air pressure control of blast exists
0.4-0.5MPa。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820286379.0U CN207914537U (en) | 2018-03-01 | 2018-03-01 | A kind of profile-followed hot core box mould for extending film covered sand core exhaust passage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820286379.0U CN207914537U (en) | 2018-03-01 | 2018-03-01 | A kind of profile-followed hot core box mould for extending film covered sand core exhaust passage |
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| CN207914537U true CN207914537U (en) | 2018-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108296441A (en) * | 2018-03-01 | 2018-07-20 | 溧阳市联华机械制造有限公司 | A kind of hot core box mould and sand core forming method extending film covered sand core exhaust passage |
-
2018
- 2018-03-01 CN CN201820286379.0U patent/CN207914537U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108296441A (en) * | 2018-03-01 | 2018-07-20 | 溧阳市联华机械制造有限公司 | A kind of hot core box mould and sand core forming method extending film covered sand core exhaust passage |
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