CN103978163A - Process for manufacturing multi-branch complex sand core through precoated sand by low pressure and slow stacking - Google Patents
Process for manufacturing multi-branch complex sand core through precoated sand by low pressure and slow stacking Download PDFInfo
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- CN103978163A CN103978163A CN201410234809.0A CN201410234809A CN103978163A CN 103978163 A CN103978163 A CN 103978163A CN 201410234809 A CN201410234809 A CN 201410234809A CN 103978163 A CN103978163 A CN 103978163A
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Abstract
The invention discloses a process for manufacturing a multi-branch complex sand core through precoated sand by low pressure and slow stacking. The process is characterized in that a sand shooting head of a precoated sand core shooting machine is used as a main sand shooting head; secondary sand shooting heads as many as sand shooting holes are designed relative to the main sand shooting head; the sand shooting holes are as many as branches of the sand core; the space between every two sand shooting holes is equal to the arrangement space between every two sand shooting heads; the sand shooting holes are communicated with die chamber branches through sand shooting flow channels; sand inlets of the sand shooting flow channels are used as the sand shooting holes; the sectional area of the sand shooting flow channels is 90% to 95% of the minimum sectional area of the part to be filled; the plurality of sand shooting holes shoot sand at the same time under low pressure. With the adoption of the process for manufacturing the multi-branch complex sand core through the precoated sand by low pressure and slow stacking, the problem that sand cannot reach the bending branch position of the complex sand core through a single sand shooting hole can be perfectly solved, and the problems of poor molding, choking and surface loosening can also be solved. The process is simple, the production cost is low, the operation is convenient, high applying value is achieved in the actual production of the casting industry, and industrial popularization and application are easy to be realized.
Description
Technical field
The present invention relates to a kind of manufacturing process of film covered sand core of complicated core, be specially the complicated core of a kind of multi-branched and penetrate the manufacturing process that sand mouth low pressure is piled up film covered sand core slowly more.
Background technology
Along with the numerous development of new techniques of automobile engine, the design of engine related accessory also becomes increasingly complex, and the accessory of these multi-branched complexity depend merely on metal die cannot moulding, need to use internal cores more.Zhe Jiudui sand core manufacturing process has proposed requirements at the higher level, along with core complexity strengthens, core moulding has just become making core greatest problem with exhaust, the core problem of being manufactured with will directly cause accessory undesirable, and then engine cannot be met design requirement, cause performance to be had a greatly reduced quality even unqualified.
At present, use the single sand mouth increasing shooting pressure of penetrating that sand injection need to be filled to position to each.The method easily causes that the complicated core difficult forming of multi-branched, exhaust are bad, the not fine and close problem of surface porosity, and because pressure improves the service life that greatly reduces mould and relevant device accessory, has increased production cost.
Summary of the invention
The object of the invention is to overcome prior art weak point, provides a kind of low pressure to pile up slowly the manufacturing process of the complicated core of precoated sand multi-branched.
The object of the invention is achieved through the following technical solutions:
The manufacturing process of piling up slowly the complicated core of precoated sand multi-branched for realizing above-mentioned low pressure, technical solution of the present invention is as follows:
Low pressure is piled up a manufacturing process for the complicated core of precoated sand multi-branched slowly, it is characterized in that, it comprises:
(1) mould is penetrated Sha Kou and is penetrated sand runner design:
First the convenient taking-up of the die sinking of take core is principle, determine die joint and the die cavity distributing position on mould, then the branch quantity having according to core determines that mould penetrates the quantity of sand mouth, it is identical that the quantity of penetrating sand mouth and core have branch quantity, penetrate between sand mouth distance identical with sand-shooting head spread length, penetrate sand mouth and be connected with die cavity branch by penetrating sand flow road, penetrate the sand inlet in sand flow road for penetrating Sha Kou;
(2) penetrate the design of sand flow dividing structure
Penetrate sand flow dividing structure and comprise that penetrating sand shunts chamber and a plurality of secondary sand-shooting head, the quantity of secondary sand-shooting head is identical with the quantity that mould is penetrated sand mouth; Coated sand core shooting machine with sand-shooting head be main sand-shooting head, after main sand-shooting head is penetrated sand, precoated sand enters the shunting chamber of penetrating sand flow dividing structure, enters a plurality of secondary sand-shooting heads after shunting, then by the corresponding mould of secondary sand-shooting head, penetrates Sha Kou and enter mould;
(3) mould is penetrated the sectional area design of sand flow road:
Penetrate sand flow road sectional area and be of a size of the 90%-95% that need to fill minimum sectional area in position;
(4) the slow build up process of low pressure:
Penetrate sand mouth more and under low pressure penetrate sand simultaneously, realize the major parameter that stacked fills type and be:
Shooting pressure setting range is 0.25-0.35MPa,
Core mold temperature setting range is 130-180 ℃.
The distribution of described secondary sand-shooting head and distance are identical with distance with the distribution that mould is penetrated between sand mouth.
The present invention compared with prior art has following outstanding advantages and remarkable result:
1, the present invention penetrates the design of sand mouth and runner more, can perfectly solve in the complicated core of prior art multi-branched, and sand cannot reach the crooked branch of core position by the single Sha Kou of penetrating; Solved simultaneously moulding bad, feel suffocated, surface porosity problem.Penetrate sand mouth more and under low pressure penetrate sand simultaneously, realized stacked and filled type, solved the not fine and close problem of surface porosity.Penetrate sand mouth sectional area size while being less than the core sectional area that need to fill minimum position in position, be convenient to exhaust.
2, the present invention has reduced the temperature that precoated sand flows and fills type, by 200-250 ℃ of common core, is adjusted to 130-180 ℃, and lower temperature guarantees that sand has better mobility and longer filling time and is beneficial to very much the discharge of mould type intracavity gas.
3, the present invention reduces shooting pressure, by 0.5-0.6MPa, is adjusted to 0.25-0.35MPa, has not only guaranteed that sand can evenly uninterruptedly flow out from sand cylinder, and has compared significantly reduction with adopting the required 0.5-0.6MPa shooting pressure of injection sand mouth.Shooting pressure reduces, and sand flowing velocity is also corresponding slack-off, has not only effectively avoided high pressure that sand is produced and flown, and difficult generation felt suffocated.Impact that pressure decreased makes to penetrate sand mouth more while pouring into simultaneously between sand flow is little, can realize stacked and fill type, has greatly slowed down sand grains to die wear and equipment loss problem.
4, the present invention has reduced shooting pressure and mold temperature, can make significantly extend the service life of mould and equipment related accessory, and manufacturing process is simple, reduces production costs, easy to operate, is easy to industrial application.
Accompanying drawing explanation
Fig. 1 is band multi-branched engine fittings core graphics;
Fig. 2 is the plane distribution location drawing that mould is penetrated sand mouth;
Fig. 3 penetrates the die cavity schematic diagram of sand flow dividing structure and engine fittings core mould with multi-branched.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing thereof, the present invention is further described, but low pressure of the present invention is piled up slowly the manufacturing process embodiment of the complicated core of precoated sand multi-branched and is not limited only to this.
The present embodiment is a kind of engine fittings core graphics with 5 branches as shown in Figure 1, and this product has curvature of space multi-branched, and more complex structure adopts the complicated core of multi-branched to penetrate sand mouth low pressure and pile up slowly precoated sand manufacturing process.
After the principle that can take out core according to common die sinking is determined die joint and the die cavity distributing position on mould, design is penetrated Sha Kou and is penetrated sand flow road, this product structure has 5 crooked branches as shown in fig. 1, only by branch 1, arrange and penetrate sand entrance, sand cannot fully reach, can not complete loading mould cavity component, need set up 4 places at branch 2,3,4,5 places and penetrate sand entrance, penetrate sand when penetrating sand mouth for 5 and fill type and realize tight filling.Penetrate sand mouth position distribution as shown in Figure 2 and Figure 3 for 5, penetrating sand mouth 15 is 32.86mm to penetrating distance L 1 between sand mouth 14, penetrating sand mouth 21 is 52.07mm to penetrating distance L 2 between sand mouth 15, penetrating sand mouth 22 is 64.24mm to penetrating distance L 3 between sand mouth 21, penetrating sand mouth 23 is 57.31mm to penetrating distance L 4 between sand mouth 22, penetrate sand mouth for 5 and by five, penetrate sand flow road 16,17,18,19,20 respectively and be connected with die cavity branch, the direction of arrow is for penetrating sand direction.
The 90%-95% that need to fill minimum sectional area in position that is designed and sized to that penetrates sand flow road sectional area, the sectional area of penetrating sand flow road 16 is: 314mm
2, the sectional area of penetrating sand flow road 17 is 78mm
2, the sectional area of penetrating sand flow road 18 is 226mm
2, the sectional area of penetrating sand flow road 19 is 132mm
2, the sectional area of penetrating sand flow road 20 is 153mm
2, be convenient to exhaust.
As shown in Figure 3, coated sand core shooting machine with sand-shooting head be main sand-shooting head 9, penetrate sand flow dividing structure and comprise that penetrating sand shunts chamber 12 and 5 secondary sand-shooting heads 6, 7, 8, 10, 11, penetrating sand shunting chamber 12 is to form by penetrating sand shunting chamber upper plate 24 and penetrating sand shunting chamber lower plate 13, after main sand-shooting head 9 is penetrated sand, precoated sand enters the shunting chamber 12 of penetrating sand flow dividing structure, precoated sand enters 5 secondary sand-shooting heads 6 after the shunting of shunting chamber, 7, 8, 10, 11, by the corresponding mould of 5 secondary sand-shooting heads 5 penetrate sand mouth 14 again, 15, 21, 22, 23 enter mould penetrate sand flow road 16, 17, 18, 19, 20, enter again mold cavity.Penetrate the sand inlet in sand flow road for penetrating Sha Kou, penetrate sand mouth and be connected with die cavity branch by penetrating sand flow road.The distribution of secondary sand-shooting head and distance are identical with distance with the distribution that mould is penetrated between sand mouth.
The complicated core molding process of multi-branched: the complicated core mould of the multi-branched of having manufactured is arranged on the workbench of rectilinear coated sand core shooting machine, coated sand core shooting machine before operation each motion parts in home position, moving platen is at die sinking position, sand cylinder, at raised position and home position, is penetrated sand in closed position; Ready roughing sand is added to incident sand machine; Core mold temperature setting range is 130-180 ℃, and the present embodiment mold temperature is set as 160 ℃, and the reduction of temperature guarantees that sand has better mobility and filling time more fully.Shooting pressure setting range is 0.25-0.35MPa, the present embodiment shooting pressure is set as 0.3MPA, and pressure reduces compared with prior art, and the sand of avoiding high pressure to produce flies, difficult generation is felt suffocated, and the loss of sand grains to the wearing and tearing of mould and equipment also alleviated in the reduction of pressure greatly.Closing cylinder feeding mould matched moulds, the feeding simultaneously of sand cylinder cylinder, hold-down cylinder feeding is pressed on penetrating on sand mouth of mould by sand-shooting head, main sand-shooting head is penetrated precoated sand after sand and is entered secondary sand-shooting head after entering the shunting of shunting chamber again, 5 secondary sand-shooting heads are penetrated sand simultaneously, sand enters mold cavity after mould is penetrated Sha Kou, runner, and precoated sand is piled up until be full of whole mold cavity, precoated sand curing molding gradually in mold cavity.Shooting pressure is set lower, and sand flow speed is slower, and the slow accumulation of sand is slower, and the impact between sand flow is little, can realize stacked and fill type, has solved the not fine and close problem of surface porosity.Finally, hold-down cylinder retreats, and penetrates head and unclamps, and sand cylinder cylinder retreats, and die sinking is taken out the core of moulding from mould, and cleaning, cuts away and penetrate Sha Kou with saw blade, completes core and makes.
Claims (2)
1. low pressure is piled up a manufacturing process for the complicated core of precoated sand multi-branched slowly, it is characterized in that, it comprises:
(1) mould is penetrated Sha Kou and is penetrated sand runner design:
First the convenient taking-up of the die sinking of take core is principle, determine die joint and the die cavity distributing position on mould, then the branch quantity having according to core determines that mould penetrates the quantity of sand mouth, it is identical that the quantity of penetrating sand mouth and core have branch quantity, penetrate between sand mouth distance identical with sand-shooting head spread length, penetrate sand mouth and be connected with die cavity branch by penetrating sand flow road, penetrate the sand inlet in sand flow road for penetrating Sha Kou;
(2) penetrate the design of sand flow dividing structure
Penetrate sand flow dividing structure and comprise that penetrating sand shunts chamber and a plurality of secondary sand-shooting head, the quantity of secondary sand-shooting head is identical with the quantity that mould is penetrated sand mouth; Coated sand core shooting machine with sand-shooting head be main sand-shooting head, after main sand-shooting head is penetrated sand, precoated sand enters the shunting chamber of penetrating sand flow dividing structure, enters a plurality of secondary sand-shooting heads after shunting, then by the corresponding mould of secondary sand-shooting head, penetrates Sha Kou and enter mould;
(3) mould is penetrated the sectional area design of sand flow road:
Penetrate sand flow road sectional area and be of a size of the 90%-95% that need to fill minimum sectional area in position;
(4) the slow build up process of low pressure:
Penetrate sand mouth more and under low pressure penetrate sand simultaneously, realize the major parameter that stacked fills type and be:
Shooting pressure setting range is 0.25-0.35MPa,
Core mold temperature setting range is 130-180 ℃.
2. a kind of low pressure according to claim 1 is piled up the manufacturing process of the complicated core of precoated sand multi-branched slowly, it is characterized in that: the distribution of described secondary sand-shooting head and distance are identical with distance with the distribution that mould is penetrated between sand mouth.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410234809.0A CN103978163A (en) | 2014-05-29 | 2014-05-29 | Process for manufacturing multi-branch complex sand core through precoated sand by low pressure and slow stacking |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410234809.0A CN103978163A (en) | 2014-05-29 | 2014-05-29 | Process for manufacturing multi-branch complex sand core through precoated sand by low pressure and slow stacking |
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| CN103978163A true CN103978163A (en) | 2014-08-13 |
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| CN201410234809.0A Pending CN103978163A (en) | 2014-05-29 | 2014-05-29 | Process for manufacturing multi-branch complex sand core through precoated sand by low pressure and slow stacking |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108246985A (en) * | 2018-04-12 | 2018-07-06 | 肇庆本田金属有限公司 | A kind of improved sand core formative method and Special ejection sand mouth structure |
Citations (5)
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| DE4208647A1 (en) * | 1992-03-18 | 1993-09-23 | Hottinger Adolf Masch | DEVICE FOR SHOOTING FOUNDRY CORE OR MOLD WITH MOLDING MATERIAL |
| US5291936A (en) * | 1990-10-25 | 1994-03-08 | Adolf Hottinger Maschinenbau Gmbh | Method and apparatus for producing mold parts for foundries |
| CN201091905Y (en) * | 2007-09-26 | 2008-07-30 | 苏州工业园区明志铸造装备有限公司 | Sand spraying mechanism for making complex core |
| CN101462152A (en) * | 2008-11-28 | 2009-06-24 | 苏州明志科技有限公司 | Sand-jetting mechanism sand core-molding method using the same |
| CN202438663U (en) * | 2012-03-01 | 2012-09-19 | 昆山市镫禾精密机械有限公司 | Core shooting machine |
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2014
- 2014-05-29 CN CN201410234809.0A patent/CN103978163A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5291936A (en) * | 1990-10-25 | 1994-03-08 | Adolf Hottinger Maschinenbau Gmbh | Method and apparatus for producing mold parts for foundries |
| DE4208647A1 (en) * | 1992-03-18 | 1993-09-23 | Hottinger Adolf Masch | DEVICE FOR SHOOTING FOUNDRY CORE OR MOLD WITH MOLDING MATERIAL |
| CN201091905Y (en) * | 2007-09-26 | 2008-07-30 | 苏州工业园区明志铸造装备有限公司 | Sand spraying mechanism for making complex core |
| CN101462152A (en) * | 2008-11-28 | 2009-06-24 | 苏州明志科技有限公司 | Sand-jetting mechanism sand core-molding method using the same |
| CN202438663U (en) * | 2012-03-01 | 2012-09-19 | 昆山市镫禾精密机械有限公司 | Core shooting machine |
Non-Patent Citations (2)
| Title |
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| 吉祖明: "CB型冷芯盒射芯机的结构和特点", 《中国铸造装备与技术》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108246985A (en) * | 2018-04-12 | 2018-07-06 | 肇庆本田金属有限公司 | A kind of improved sand core formative method and Special ejection sand mouth structure |
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Application publication date: 20140813 |