CN102744365B - Lost foam casting method of cylinder of single cylinder diesel engine - Google Patents
Lost foam casting method of cylinder of single cylinder diesel engine Download PDFInfo
- Publication number
- CN102744365B CN102744365B CN201210207862.2A CN201210207862A CN102744365B CN 102744365 B CN102744365 B CN 102744365B CN 201210207862 A CN201210207862 A CN 201210207862A CN 102744365 B CN102744365 B CN 102744365B
- Authority
- CN
- China
- Prior art keywords
- evaporative pattern
- white mould
- casting
- molding sand
- cylinder body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention relates to a casting method, and especially relates to a lost foam casting method of a cylinder of a single cylinder diesel engine. The lost foam casting method of a cylinder of a single cylinder diesel engine comprises the following steps: foaming, blank mold preparation, mold combination, coating, flask molding, and casting; the invention solves the problems of high equipment cost investment and problems existing in blank mold preparation, coating technology, casting technology and the like which can not be overcome; the casting method of the invention not only ensures the cast quality, provides a whole environment-friendly and pollution-free production process, but also realizes mass production of cylinders of diesel engines and gasoline engines by lost foam casting.
Description
Technical field
The present invention relates to a kind of casting method, especially a kind of lost-foam casting method of single cylinder diesel cylinder body.
Background technology
Single cylinder diesel cylinder body is a kind of foundry goods of more complicated, domestic main employing clay sand mold casting, minority enterprise adopts cold-box or hot box casting, but these casting method ubiquity labour intensity are large, environmental pollution serious, molding sand reuse is few, antiquated sand cannot be processed, raw materials consumption is heavy, casting weight is laid particular stress on, casting quality cannot guarantee series of problems such as (mould shift, sand holes, slag inclusion, pores etc.).The appearance of lost foam casting has thoroughly solved traditional sand casting and has often been accompanied by the defects such as mould shift, sand holes, slag inclusion, pore, rough surface, and the foundry goods that lost foam casting process is produced, can effectively control casting defect, fineness is also improved significantly, and lost foam casting adopts the dry sand of certain order number, dry sand can recycle, and reclamation rate is up to 99.5%, energy-conserving and environment-protective.
Existing lost foam casting process is because equipment cost drops into, and there is the problem that cannot overcome in the technology such as Foam Pattern mould (Bai Mo) manufacture, coating process, pouring technology: 1. in lost foam casting process, need to manufacture white mould, Bai Mo easily produces distortion (as: polystyrene bead pre-send out density is little, Bai Mo is subject to the External Force Actings such as hydraulic pressure when the demoulding and deform) in manufacture process; 2. the coating being coated with on white mould is inhomogeneous, is not coated with complete and has showed money or valuables one carries unintentionally, can scab during casting; 3. there is back-up sand blind area in white mould; 4. in when casting, a. placements that generally cylinder head of white mould can be faced up, can reduce blind area like this, but the cylinder head face obtaining of casting has carbon slag; B. also easily there is the situation of scab in the temperature distortion of cast gate place, these all can affect the quality of foundry goods, and the enterprise that utilizes at home lost foam casting process to produce diesel engine, cylinder of petrol engine in enormous quantities at present does not almost have, and the overwhelming majority is also in looking around experimental stage.
Summary of the invention
The technical problem to be solved in the present invention is: based on the problems referred to above, the invention provides a kind of lost-foam casting method of single cylinder diesel cylinder body, to solve equipment cost, drop into high, and the problem that cannot overcome of white moldedly making, existing in the technology such as coating process, pouring technology, realize the one-tenth article batch that utilizes lost foam casting process to produce diesel engine, cylinder of petrol engine.
The technical solution adopted for the present invention to solve the technical problems is: a kind of lost-foam casting method of single cylinder diesel cylinder body is provided, comprises the steps:
A. polystyrene bead is injected to batch (-type) steam pre-foaming machine by a 1kg, adopting the time relay, temperature controller Synchronization Control advance time is 20～40s, temperature is 80～100 ℃, simultaneously, control that pre-to send out density be 18～25g/l, then by the polystyrene bead that output occurs in advance as for slaking storehouse aeration-drying 8～16h;
B. the polystyrene bead after sending out is in advance injected in the hopper of semi-automatic hydraulic forming machine, produce the upper die and lower die of the white mould of single cylinder diesel cylinder body evaporative pattern, after depanning, the upper die and lower die of the white mould of evaporative pattern are carried out to matched moulds, after matched moulds, the whiter mould of evaporative pattern is lain on a smooth cushion block, and on patrix and in the inner chamber of counterdie, each pressure is put a briquetting, and the white mould of the evaporative pattern with cushion block and briquetting is put into the hothouse inner drying of 30～45 ℃;
C. the briquetting of the white mould of dried evaporative pattern in step b is removed, the cylinder head placed face down of the white mould of evaporative pattern, again the white mould of casting system is bonded to a side of the white mould of evaporative pattern, the white mould of evaporative pattern tilts 15 ° towards the white mould direction of casting system, has obtained the evaporative pattern model of single cylinder diesel cylinder body;
D. the evaporative pattern model of the single cylinder diesel cylinder body in step c is soaked and hang in lost foam paint 1～2 time, make thickness of coating layer reach 0.5～5mm, the place that is difficult for filling consolidation for casting, brushing increase thickness of coating layer is 2～3mm, the peripheral parcel of the gate part glass-fiber-fabric of casting system, then puts into the hothouse inner drying of 40～50 ℃;
E. dried single cylinder diesel cylinder body evaporative pattern model is vertically placed in the three-dimensional vibrating sandbox that is covered with bottom molding sand, cylinder head faces down, adopt rain type back-up sand method, molding sand, limit vibration are filled out in limit, cylinder body top molding sand thickness is 10～15cm, and cast gate exceeds molding sand plane 3～5cm, then in molding sand surface coverage layer of plastic film, and cover the molding sand that 2～4cm is thick and expose cast gate at film surface, sandbox is in closed state;
F. the sandbox of closed state is linked into vacuum system by the vacuum docking port on sandbox, controlling sandbox negative pressure is 0.035～0.06Mpa, the iron liquid of 1450～1520 ℃ is injected in the cast gate of single cylinder oil production machine cylinder body evaporative pattern model, Bai Mo fusing, apperance space is replaced by iron liquid, and the gaseous impurity of generation sees through coating and molding sand enters vacuum system, by discharging after purified treatment, after iron liquid solidifies, take out foundry goods cleaning, obtain the foundry goods of single cylinder diesel cylinder body.
In casting cycle, because molten iron density is large, dregs density is relatively little, dregs float over the molten iron the superiors, the cylinder head placement that faces up, and the foam at cylinder head place is thicker, be easy to produce carbon slag, carbon slag can remain on cylinder head face, and that cylinder head regards to diesel engine cylinder block is most important, can not have any defect.The defective foundry goods of cylinder head face can only be worked as waste disposal; If cylinder head faces down during casting, yield rate can obviously improve.
In step a, control polystyrene bead pre-to send out density be 18～25g/l, if density lower than 18g/l, because cylinder block casting wall thickness differs, thin place only has 4mm, can cause white mould insufficient strength, is easy to distortion, even fracture; If density is higher than 25g/l, in casting cycle, gas forming amount is large, easily produces casting defect, as pore, and carbon defects etc.
In step b after the upper die and lower die matched moulds of the white mould of evaporative pattern, lie on a smooth cushion block, and on patrix and in the inner chamber of counterdie, each pressure is put a briquetting, and the white mould of the evaporative pattern with cushion block and briquetting is put into the hothouse inner drying of 30～45 ℃, can effectively be prevented the distortion of the white mould of evaporative pattern.
In described step c, the white mould of evaporative pattern tilts 0～60 ° towards the white mould direction of casting system, the white mould of the white mould of general evaporative pattern and casting system is in the same horizontal line, being the white mould of evaporative pattern tilts 0 ° towards the white mould direction of casting system, post-processed after having cast is convenient, but the white mould of evaporative pattern can reduce molding sand flow resistance towards the white mould direction inclination certain angle of casting system, make molding sand can fill up fully fast cylinder interior, if angle of inclination is greater than 60 °, can increase molding sand flow resistance.
In described steps d, for casting, be difficult for filling the place of consolidation, fill up resin sand, effect is the same with increasing thickness of coating layer, is all in order to solve back-up sand blind area.Because single cylinder diesel cylinder interior complex structure, there is dead angle, many right angles and blind area, in back-up sand process, dead angle and position, blind area molding sand cannot flow and put in place, cause part to be filled out less than molding sand, cause not consolidation of local molding sand, defects such as scab, crush of generation, fill up resin sand or increase thickness of coating layer, having overcome well a lot of dead angles and the blind area on housing structure, making molding sand fully fill up cylinder interior structure, effectively solve back-up sand problem not in place, ensured product quality.
In steps d, if the evaporative pattern model of single cylinder diesel cylinder body is soaked and hung in lost foam paint 2 times, need after a coating be dry, soak and hang second time coating, because first pass coating is not dry, evaporative pattern mold strength be not high, can affect the end product quality of casting.
In described step c, on the white mould of evaporative pattern, be bonded with a thin slice, in casting cycle, because molten iron density is large, dregs float over the molten iron the superiors, finally can remain on cylinder body, have had after thin slice, dregs just all gather on thin slice, have guaranteed casting quality, have reduced casting wasted product rate.
The molding sand of filling out in described step e is 20～100 objects, and within the scope of this, the molding sand of size, can guarantee, under the prerequisite of vibration ramming, to be beneficial to the outflow of gas in casting cycle, improves gas permeability.
Main contributions point of the present invention is: 1. effectively control polystyrene bead pre-to send out density be 18～25g/l, can not cause white mould insufficient strength and produce distortion, even rupture, can not produce casting defect yet, as pore, carbon defects etc.
2. for the evaporative pattern model of single cylinder diesel cylinder body, soak and hang in lost foam paint 1～2 time, make thickness of coating layer reach 0.5～5mm, the white mould of evaporative pattern can not show money or valuables one carries unintentionally, and during casting, just can not produce the situation of scab, and product quality is played to good facilitation.
3. glass-fiber-fabric is wrapped up in the gate part of casting system periphery, can effectively control the situation of cast gate place temperature distortion generation scab.
4. for casting, be difficult for filling the place of consolidation, brush increase thickness of coating layer and be 2～3mm or fill up in advance resin sand, can solve the problem of back-up sand blind area.
5. in the white mould bonding process of the white mould of the disappearance of single cylinder diesel cylinder body and casting system, guarantee that cylinder head faces down; When single cylinder diesel cylinder body evaporative pattern model is put into sandbox, also guarantee that cylinder head faces down, can effectively solve the carbon slag problem of cylinder head face, improve casting quality, reduce casting wasted product rate.
6. casting method of the present invention has not only guaranteed the quality of foundry goods, whole production process environmental protection, pollution-free, and can realize with lost foam casting and produce diesel engine, cylinder of petrol engine in enormous quantities.
Accompanying drawing explanation
Below in conjunction with accompanying drawing embodiment, the present invention is further described.
Structural representation when Fig. 1 is the white mould matched moulds of evaporative pattern of the present invention.
Fig. 2 is the structural representation of the invention process 1.
Fig. 3 is the structural representation of the embodiment of the present invention 2.
1. vacuum docking ports in figure, 2. plastic sheeting, 3. molding sand, the 4. white mould of evaporative pattern, 5. cast gate, 6. cylinder head face, 7. angle of inclination, the 8. white mould of casting system, 11. cushion blocks, 12. patrixes, 13. counterdies, 14. briquettings.
The specific embodiment
The invention will be further described in conjunction with specific embodiments now, and following examples are intended to illustrate the present invention rather than limitation of the invention further.
Structural representation during the white mould matched moulds of evaporative pattern as shown in Figure 1, the white mould 4 of evaporative pattern is placed on the cushion block 11 of surfacing, the patrix 12 of the white mould 4 of evaporative pattern is respectively pressed and is equipped with briquetting 14 above and in counterdie 13 inner cavity surface, can guarantee well the white mould 4 shape invariance shapes of evaporative pattern after matched moulds.
Embodiment 1
As shown in Figure 2, the white mould 4 of evaporative pattern of single cylinder diesel cylinder body is placed in the three-dimensional vibrating sandbox that is covered with bottom molding sand 3, cylinder head face 6 down, two the white moulds 4 of evaporative pattern of ining succession on the white mould 8 of a casting system, white mould 4 lateral inclinations of evaporative pattern, angle of inclination 7 is 15 °, cylinder body top molding sand 3 thickness are 12cm, cast gate 5 exceeds molding sand 3 plane 4cm, molding sand 3 surface coverage layer of plastic film 2, and at the thick molding sand 3 of film 2 surface coverage 3cm and expose cast gate 5, sandbox is in closed state, sandbox is connected to vacuum system by the vacuum docking port 1 of its bottom, 15 ° of white mould 4 lateral inclinations of cylinder body evaporative pattern, reduce molding sand flow resistance, make molding sand can fill up fully fast cylinder interior.
Embodiment 2
As shown in Figure 3, the white mould 4 of evaporative pattern of single cylinder diesel cylinder body is placed in the three-dimensional vibrating sandbox that is covered with bottom molding sand 3, cylinder head face 6 down, the white mould 4 of evaporative pattern of ining succession on the white mould 8 of a casting system, cylinder body top molding sand 3 thickness are 13cm, cast gate 5 exceeds molding sand 3 plane 5cm, molding sand 3 surface coverage layer of plastic film 2, and at the thick molding sand 3 of film 2 surface coverage 4cm and expose cast gate 5, sandbox is in closed state, sandbox is connected to vacuum system by the vacuum docking port 1 of its bottom.
The above-mentioned foundation desirable embodiment of the present invention of take is enlightenment, and by above-mentioned description, relevant staff can, within not departing from the scope of this invention technological thought, carry out various change and modification completely.The technical scope of this invention is not limited to the content on description, must determine its technical scope according to claim scope.
Claims (1)
1. the lost-foam casting method of single cylinder diesel cylinder body, is characterized in that: comprise the steps:
A. polystyrene bead is injected to batch (-type) steam pre-foaming machine by a 1kg, adopting the time relay, temperature controller Synchronization Control advance time is 20～40s, temperature is 80～100 ℃, simultaneously, control that pre-to send out density be 18～25g/l, then by the polystyrene bead that output occurs in advance as for slaking storehouse aeration-drying 8～16h;
B. the polystyrene bead after sending out is in advance injected in the hopper of semi-automatic hydraulic forming machine, produce the upper die and lower die of the white mould of single cylinder diesel cylinder body evaporative pattern, after depanning, the upper die and lower die of the white mould of evaporative pattern are carried out to matched moulds, after matched moulds, the whiter mould of evaporative pattern is lain on a smooth cushion block, and on patrix and in the inner chamber of counterdie, each pressure is put a briquetting, and the white mould of the evaporative pattern with cushion block and briquetting is put into the hothouse inner drying of 30～45 ℃;
C. the briquetting of the white mould of dried evaporative pattern in step b is removed, the cylinder head placed face down of the white mould of evaporative pattern, again the white mould of casting system is bonded to a side of the white mould of evaporative pattern, the white mould of evaporative pattern tilts 15 ° towards the white mould direction of casting system, has obtained the evaporative pattern model of single cylinder diesel cylinder body;
D. the evaporative pattern model of the single cylinder diesel cylinder body in step c is soaked and hang in lost foam paint 1～2 time, make thickness of coating layer reach 0.5～5mm, the place that is difficult for filling consolidation for casting, brushing increase thickness of coating layer is 2～3mm, the peripheral parcel of the gate part glass-fiber-fabric of casting system, then puts into the hothouse inner drying of 40～50 ℃;
E. dried single cylinder diesel cylinder body evaporative pattern model is vertically placed in the three-dimensional vibrating sandbox that is covered with bottom molding sand, cylinder head faces down, adopt rain type back-up sand method, molding sand, limit vibration are filled out in limit, cylinder body top molding sand thickness is 10～15cm, and cast gate exceeds molding sand plane 3～5cm, then in molding sand surface coverage layer of plastic film, and cover the molding sand that 2～4cm is thick and expose cast gate at film surface, sandbox is in closed state;
F. the sandbox of closed state is linked into vacuum system by the vacuum docking port on sandbox, controlling sandbox negative pressure is 0.035～0.06Mpa, the iron liquid of 1450～1520 ℃ is injected in the cast gate of single cylinder oil production machine cylinder body evaporative pattern model, Bai Mo fusing, apperance space is replaced by iron liquid, and the gaseous impurity of generation sees through coating and molding sand enters vacuum system, by discharging after purified treatment, after iron liquid solidifies, take out foundry goods cleaning, obtain the foundry goods of single cylinder diesel cylinder body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210207862.2A CN102744365B (en) | 2012-06-21 | 2012-06-21 | Lost foam casting method of cylinder of single cylinder diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210207862.2A CN102744365B (en) | 2012-06-21 | 2012-06-21 | Lost foam casting method of cylinder of single cylinder diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102744365A CN102744365A (en) | 2012-10-24 |
| CN102744365B true CN102744365B (en) | 2014-04-09 |
Family
ID=47025056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210207862.2A Active CN102744365B (en) | 2012-06-21 | 2012-06-21 | Lost foam casting method of cylinder of single cylinder diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102744365B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104084534A (en) * | 2014-07-03 | 2014-10-08 | 江苏海纬集团有限公司 | Foundry technology process |
| CN104226905B (en) * | 2014-09-01 | 2016-07-06 | 山西模范机械制造有限公司 | The technique ensureing lost foam casting dry type internal combustion engine cylinders water channel cleaning |
| CN105562600A (en) * | 2016-01-22 | 2016-05-11 | 常州市常协柴油机机体有限公司 | White mold production process of evanescent mode |
| CN105618680A (en) * | 2016-01-22 | 2016-06-01 | 常州市常协柴油机机体有限公司 | Full mold casting technique for diesel engine cylinder body |
| CN105665638A (en) * | 2016-01-22 | 2016-06-15 | 常州市常协柴油机机体有限公司 | Manufacturing process for cylinder block of single cylinder diesel |
| CN106077482A (en) * | 2016-08-04 | 2016-11-09 | 安徽兴达动力机械有限公司 | A kind of casting method of multi-cylinder diesel engine cylinder body |
| CN106077483A (en) * | 2016-08-08 | 2016-11-09 | 安徽兴达动力机械有限公司 | A kind of multi-cylinder diesel engine cylinder body casting mould and casting technique thereof |
| CN107234214A (en) * | 2017-06-14 | 2017-10-10 | 安徽华昊机械制造有限公司 | A kind of casting technique of the pump housing |
| CN108080568A (en) * | 2017-12-27 | 2018-05-29 | 安徽兴达动力机械有限公司 | A kind of lost foam casting process of multi-cylinder diesel engine cylinder body |
| CN109014049A (en) * | 2018-08-24 | 2018-12-18 | 山西山佳阀门制造有限公司 | A kind of medium-sized part method of lost foam casting |
| CN113369440A (en) * | 2021-06-04 | 2021-09-10 | 河南省金太阳精密铸业股份有限公司 | Full mold casting production process by matching loose sand and resin sand |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1208151C (en) * | 2002-10-28 | 2005-06-29 | 王玉和 | Method of casting loading machine large speed changing box body using vanishing mould |
| CN1843657A (en) * | 2006-04-25 | 2006-10-11 | 安徽天钰机械股份有限公司 | Lost-foam casting process for cylinder body and cylinder cap of diesel engine and gasoline engine |
| CN101480698A (en) * | 2009-01-14 | 2009-07-15 | 宁波通达精密铸造有限公司 | Non-carburized casting method for lost foam |
| CN102363198B (en) * | 2011-04-11 | 2013-08-28 | 中方阀业淅川制造有限公司 | Evaporative pattern casting method of nodular cast iron flywheel casing |
| CN102363200A (en) * | 2011-09-23 | 2012-02-29 | 无锡市凯杰铸造有限公司 | Lost foam casting method of lock casing of freight container hand-operated lock |
-
2012
- 2012-06-21 CN CN201210207862.2A patent/CN102744365B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102744365A (en) | 2012-10-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102744365B (en) | Lost foam casting method of cylinder of single cylinder diesel engine | |
| CN102773409B (en) | Method for manufacturing casting blank of die for inner containers of household appliances on basis of metal cavity with cold iron structure | |
| CN105618680A (en) | Full mold casting technique for diesel engine cylinder body | |
| CN102935491A (en) | Metal section mould with controllable cross section and gravity slantingly-rotated foundry technique of aluminum alloy cylinder cover of metal section mould | |
| CN107716872A (en) | A kind of casting method of large-scale working ways | |
| CN201455197U (en) | Sand box for vacuum lost foam large-sized complex casting | |
| CN104439075A (en) | Evanescent mode casting technology | |
| CN204075071U (en) | Oil cylinder casting sand mold | |
| CN101623745B (en) | Process method of in-series pouring multiple lost moulds in one box | |
| CN205236971U (en) | Gear box box casting mould | |
| CN103639361A (en) | Full-mold casting method of resin sand without dead head | |
| CN102672113A (en) | Method for pouring copper alloy neck mould of glass mould by using single resin sand box | |
| CN103894548A (en) | Lost foam casting process for flywheel cover of heavy truck engine | |
| CN106077483A (en) | A kind of multi-cylinder diesel engine cylinder body casting mould and casting technique thereof | |
| CN102974760A (en) | Lost foam casting device and casting method | |
| CN101941055A (en) | Boxing method of lost foam casting model and auxiliary compaction tool | |
| CN103223465A (en) | Method for casting zinc alloy lost foam with low melting point | |
| CN202506809U (en) | Sand core molding structure | |
| CN205949800U (en) | Static pressure molding machine of penetrating sand end of with is penetrated on top | |
| CN205270747U (en) | A pouring mechanism for wheel hub lost -foaming casting process | |
| CN201807699U (en) | Auxiliary jolt-ramming tool for casting model containers | |
| CN103600035A (en) | Manufacturing technology of walking machinery bracket casting | |
| CN204799907U (en) | Large castings sand box | |
| CN203030867U (en) | Large-scale plate mould used for ultrahigh pressure switch | |
| CN102310163A (en) | Lost foam casting method of engine gear chamber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |