CN103934411B - The moulding of PEPSET resin and sand recycle clean casting technique - Google Patents
The moulding of PEPSET resin and sand recycle clean casting technique Download PDFInfo
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- CN103934411B CN103934411B CN201410112236.4A CN201410112236A CN103934411B CN 103934411 B CN103934411 B CN 103934411B CN 201410112236 A CN201410112236 A CN 201410112236A CN 103934411 B CN103934411 B CN 103934411B
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Abstract
The present invention is that the moulding of a kind of PEPSET resin and sand recycle clean casting technique, and comprising with molding sand is that raw material carries out PEPSET phenolic sand molding, is inserted by core in die cavity, and after utilizing automatic closer mould assembling, molten iron is cast.Knockout after formed product.Old sand enters antiquated sand regeneration treatment system, can be used for cold-box core blower and makes core, decrease adding of fresh sand in coremaking process, achieve recycling of old sand through the sand of regeneration process.
Description
Technical field
The present invention relates to a kind of New Casting Technique.Foundry goods of the present invention is mainly used as key components and parts and the Mechanical Fundamentals foundry goods in the fields such as bullet train, automobile, engineering machinery, lathe, large-scale petrochemical device, boats and ships, petroleum machinery and track traffic.
Background technology
Existing casting technique generally adopts furane resins sand molding, and because furan resin-sand reacts gradually and hardens, when starting to react, sand can be clamminess, poor fluidity.On the other hand, furane resins are more responsive to environment temperature, and then setting rate is just slow when the temperature is low, when temperature or sand temperature too high time, setting rate too soon, then can have little time moulding.Meanwhile, containing sulphur and nitrogen in furane resins, sulphur wherein can infiltrate cast(ing) surface, affects the Oxygen potential of cast(ing) surface; Nitrogen is then the main cause causing pore.
In addition, existing regenerating used system generally adopts machinery to exchange views formula, and its shortcoming is that regeneration efficiency is low, and stripping result is poor.
Summary of the invention
Technical problem to be solved by this invention is, provides the moulding of a kind of PEPSET resin and sand to recycle clean casting technique,
Improve casting quality, improve the cyclic utilization rate of resin sand, reduce the pollution level of production process.
Technical scheme of the present invention is as follows:
A kind of PEPSET resin moulding and sand recycle clean casting technique, it is characterized in that: be that raw material carries out PEPSET phenolic sand molding with molding sand, inserted by core in die cavity, and after utilizing automatic closer mould assembling, molten iron is cast; Knockout after formed product; Old sand enters antiquated sand regeneration treatment system; Sand through regeneration process adds in fresh sand and recycles as molding sand;
Wherein, described fresh sand is prepared from through following methods: sand 1000 weight portion, phenolic resins 5 ~ 10 weight portion, PIC 3 ~ 15 weight portion, tertiary amine catalyst 0.05 ~ 0.3 weight portion; First joined in phenolic resins by catalyst, then mix with sand, finally add PIC, total mixed time processed is 50 ~ 60 seconds.
Described tertiary amine catalyst is preferably triethylamine, dimethyl amine or wopropyl ethyl amine.
Antiquated sand regeneration treating method comprises the steps:
1), old sand reclaims: in the transition bucket that old sand, spill sand become the sand lump of bulk to drop into below shakeout by shakeout swing crushing, plate chain type bucket elevator is delivered to afterwards by jigging conveyer, risen in block sand sand storage by bucket elevator, sand in block sand sand storage is expected when reaching material level, reclaimer successively autostop from shakeout, completes old sand and reclaims;
2), breaking, regenerating: the agglomerate sand material in block sand sand storage evenly to vibro-crusher feed by quantitative oscillating feeder, in vibro-crusher, is mutually rubbed with the hands and ground fragmentation and preliminary demoulding; Fragmentation is greater than 2mm after sieving, be less than the waste material of 5mm enters waste trolley, transports shakeout back; The lump material being greater than 5mm is stayed in vibro-crusher, clears out system after shutdown; The sand grains being less than 2mm is transported in transition bucket, and the sand in transition bucket is delivered in regeneration sand storage through sending cans; Until regeneration sand storage material loading position is completely expected, regenerative system is shut down automatically successively, completes broken working cycles of clashing into regeneration;
3), friction regeneration: the old sand from regeneration sand storage flow to friction regenerating device through sand sieving machine; In friction regenerating device, by high pressure positive blower air feed and through boiling device effect, old sand is suspended state, by the friction pulley two main shafts of driven by motor being provided with the manufacture of multiple high abrasion resisting material, during High Rotation Speed, the old sand of suspended state stirred, rub, resin molding is peeled off, is discharged by sand export.The air that blower fan blasts, is siphoned away by dust pelletizing system together with the resin molding peeled off, thus completes the thick level selection by winnowing of reclaimed sand, obtain clean reclaimed sand; Reclaimed sand is delivered to by compressed air in the sand storage above selection by winnowing temperature adjustment after boiling cooling bed cooling again, until material level is completely expected on this sand storage, regenerative system is shut down automatically successively, completes the working cycles of friction regeneration;
4), the selection by winnowing temperature adjustment of reclaimed sand: reclaimed sand flow to winnowing machine multilayer plate of turning back from the sand storage of top and forms very thin one deck sand flow curtain, and the air that dedusting fan sucks forms certain wind speed at sand flow curtain place, the dust micro mist suction in sand is walked; Sand evenly moves down lentamente and fully contacts cooling with heat exchanging fins under the throttling action of throttling adjusting amount of board, enters sending cans after arriving the temperature of technological requirement;
5), old sand roasting: to be entered by sending cans through the reclaimed sand of selection by winnowing temperature adjustment and join in roaster preheating chamber by the charge door of roaster, heated by pre-heating system, sand temperature is made to reach more than 820 DEG C, sand is come out of the stove and is entered boiling cooler after Thorough combustion, sand is under fluidized state, abundant and cold wind carries out heat exchange, makes the abundant cool to room temperature of hot sand, shakes out.
In old sand recycling step, be provided with suspended magnetic separator above jigging conveyer sand export for removing iron filings.
In breaking, regenerating step, the coordination of quantitative oscillating feeder, disintegrating machine, bucket elevator work realizes quantitatively by three partial circulatings automatically:
When the level-sensing device display of a, disintegrating machine is completely expected, quantitative oscillating feeder suspends, until display is without expecting and again starting after time delay;
When before b, disintegrating machine, the level-sensing device of transition bucket sends full material signal, quantitative oscillating feeder, disintegrating machine autostop successively;
C, by the time level-sensing device are in without after material also time delay, more automatically start successively, coordinate the work of disintegrating machine and bucket elevator, ensure
The normal work of disintegrating machine.
When in cooler, material level arrives upper material level, selection by winnowing amount adjusting valve is closed, and when material arrives lower material level, amount adjusting valve is opened; The productivity ratio requiring adjustment amount adjusting valve, aidr bells blast system, transmitting system according to the productivity ratio of cooler is needed during debugging, to ensure that winnowing process fully gets rid of micro mist, the abundant heat exchange of cooling system; Between cooling temperature adjustment and selection by winnowing, filter screen is set in case foreign material blocking, when occurring that on cooler, material level is completely expected, lower material level sky material, namely sends fault-signal, represents filter screen blocking, just can resume work after clearing up immediately, otherwise sending cans will stop conveying automatically.
Good effect of the present invention is:
The first, because PEPSET resin is not containing S, N, molding sand gas forming amount is little, can obviously reduce bleb defect, and foundry goods is without surperficial decaying spheroidisation phenomenon; Resin sand free-running property prepared by the present invention is good, is easy to mechanical back-up sand, and surface finish of casting is good, and dimensional accuracy is high; Resin sand curing rate prepared by the present invention is fast and evenly, thorough hardening is good, therefore has better demolding performace and elevated temperature strength, maximum 7 minutes of demould time, and adopt minimum 20 minutes of other technique demould times such as furans, production efficiency improves 3 times; In addition, core of the present invention (type) collapsibility good and be easy to regeneration, effectively can reduce crack defect.
The second, present invention employs unique reclaimed sand cyclic utilization system, the old sand rate of recovery is high, demoulding is effective, make the antiquated sand of more than 95% can regeneration, fresh sand addition is greatly reduced in reuse process, the saving and the circulation and stress that achieve resource use, and effectively can alleviate environmental pollution; Regeneration sand dust is few, Heat stability is good, stable chemical performance, can improve product yield and the yield rate of foundry goods.
Three, the present invention has supported the use old sand roasting technique, machinery is regenerated old sand after hot method roasting regeneration, can use as fresh sand completely; Fresh sand particle surface after roasting is smooth, even particle size distribution, and micro mist is few, significantly can save fresh sand; Old sand simultaneously after roasting can be directly used in the coremaking sand of cold core coremaking line.
Four, the present invention adopt resin moulding and sand recycle clean casting technique, do not produce the pernicious gas such as dioxin and sulfur dioxide, casting Technology Design is rationally advanced, and foundry goods yield rate can improve nearly 10%, every 1 ton of foundry goods can save fresh sand about 1.5 tons, really achieves energy-conserving and environment-protective.
Detailed description of the invention
The present invention is further illustrated below in conjunction with instantiation.
It is that raw material carries out PEPSET phenolic sand molding that casting technique of the present invention comprises with molding sand, is inserted by core in die cavity, and after utilizing automatic closer mould assembling, molten iron is cast.Knockout after formed product.Old sand enters antiquated sand regeneration treatment system, can be used for cold-box core blower and makes core, decrease adding of fresh sand in coremaking process, achieve recycling of old sand through the sand of regeneration process.
Wherein, fresh sand preparation example used is as follows:
Preparation example one
Sand 1000 weight portion, phenolic resins 5 weight portion, PIC 15 weight portion, tertiary amine catalyst 0.3 part.
First catalyst is joined in phenolic resins; mix with sand again; finally add PIC; (the mulling uniformity relative error of puddle mixer is total mixed system: ± 3%) time is 50 ~ 60 seconds; wherein puddle mixer start and shut down after; (i.e. head sand and tailings, must not more than the 2kg) sand produced can not participate in moulding.Do not have in puddle mixer after shutting down the impact residual sand carried out working properly.
Preparation example two
Sand 1000 weight portion, phenolic resins 8 weight portion, PIC 8 weight portion, tertiary amine catalyst 0.3 part.
First catalyst is joined in phenolic resins; mix with sand again; finally add PIC; (the mulling uniformity relative error of puddle mixer is total mixed system: ± 3%) time is 50 ~ 60 seconds; wherein puddle mixer start and shut down after; (i.e. head sand and tailings, must not more than the 2kg) sand produced can not participate in moulding.Do not have in puddle mixer after shutting down the impact residual sand carried out working properly.
Preparation example three
Sand 1000 weight portion, phenolic resins 10 weight portion, PIC 3 weight portion, tertiary amine catalyst 0.05 part.
First catalyst is joined in phenolic resins; mix with sand again; finally add PIC; (the mulling uniformity relative error of puddle mixer is total mixed system: ± 3%) time is 50 ~ 60 seconds; wherein puddle mixer start and shut down after; (i.e. head sand and tailings, must not more than the 2kg) sand produced can not participate in moulding.Do not have in puddle mixer after shutting down the impact residual sand carried out working properly.
Antiquated sand regeneration treating method of the present invention comprises the steps:
1, old sand reclaims: in the transition bucket that old sand, spill sand become the sand lump of bulk to drop into below shakeout by shakeout swing crushing; plate chain type bucket elevator is delivered to afterwards by jigging conveyer; risen in block sand sand storage by bucket elevator; sand in block sand sand storage is expected when reaching material level; reclaimer successively autostop from shakeout; complete old sand to reclaim, shakeout stops knockout.
Suspended magnetic separator is provided with for removing iron filings above jigging conveyer sand export.
2, breaking, regenerating: the agglomerate sand material in block sand sand storage evenly to vibro-crusher feed by quantitative oscillating feeder, in vibro-crusher, is mutually rubbed with the hands and ground fragmentation and preliminary demoulding.Fragmentation is greater than 2mm after sieving, be less than the waste material of 5mm enters waste trolley, transports shakeout back; The lump material being greater than 5mm is stayed in vibro-crusher, clears out system after shutdown; The sand grains being less than 2mm is transported in transition bucket, and the sand in transition bucket is delivered in regeneration sand storage through sending cans.Until regeneration sand storage material loading position is completely expected, regenerative system is shut down automatically successively, completes broken working cycles of clashing into regeneration.
Wherein the coordination of quantitatively oscillating feeder, disintegrating machine, bucket elevator work realizes quantitatively by three partial circulatings automatically:
When the level-sensing device display of a, disintegrating machine is completely expected, quantitative oscillating feeder suspends, until display is without expecting and again starting after time delay.
When before b, disintegrating machine, the level-sensing device of transition bucket sends full material signal, quantitative oscillating feeder, disintegrating machine autostop successively.By the time level-sensing device is in without after material also time delay, more automatically starts successively, coordinates the work of disintegrating machine and bucket elevator, ensures the normal work of disintegrating machine.
In order to reduce the startup-shutdown number of times of vibratory equipment; give full play to the production capacity of equipment; need to reduce partial circulating number of times; normally require according to productivity ratio the productivity ratio adjusting oscillating feeder, vibro-crusher and bucket elevator; their work is matched each other, also will select suitable transition bucket volume simultaneously.
3, friction regeneration: the old sand from regeneration sand storage flow to friction regenerating device through sand sieving machine.In friction regenerating device, by high pressure positive blower air feed and through boiling device effect, old sand is suspended state, by the friction pulley two main shafts of driven by motor being provided with the manufacture of multiple high abrasion resisting material, during High Rotation Speed, the old sand of suspended state stirred, rub, resin molding is peeled off, is discharged by sand export.The air that blower fan blasts, is siphoned away by dust pelletizing system together with the resin molding peeled off, thus completes the thick level selection by winnowing of reclaimed sand, obtain clean reclaimed sand.
Reclaimed sand is delivered to by compressed air in the sand storage above selection by winnowing temperature adjustment after boiling cooling bed cooling again, until material level is completely expected on this sand storage, regenerative system is shut down automatically successively, completes the working cycles of friction regeneration.
When the transition bucket after regenerating device that rubs completely is expected, two dynamic above friction regenerating device adds sand valve and automatically closes.
4, the selection by winnowing temperature adjustment of reclaimed sand: reclaimed sand flow to winnowing machine multilayer plate of turning back from the sand storage of top and forms very thin one deck sand flow curtain, and the air that dedusting fan sucks forms certain wind speed at sand flow curtain place, walks the dust micro mist suction in sand.Sand evenly moves down lentamente and fully contacts cooling with heat exchanging fins under the throttling action of throttling adjusting amount of board, enters sending cans after arriving the temperature (sand temperature≤40 DEG C) of technological requirement.
For ensureing the co-ordination of whole system, the present invention is also provided with several heavy partial circulating:
When in a, cooler, material level arrives upper material level, selection by winnowing amount adjusting valve is closed, and when material arrives lower material level, amount adjusting valve is opened.
The productivity ratio requiring adjustment amount adjusting valve, aidr bells blast system, transmitting system according to the productivity ratio of cooler is needed when b, debugging, to ensure that winnowing process fully gets rid of micro mist, the abundant heat exchange of cooling system.
C, cooling temperature adjustment and selection by winnowing between, filter screen is set in case foreign material blocking, when occurring that on cooler, material level is completely expected, lower material level sky material, namely sends fault-signal, represents filter screen blocking, just can resume work after clearing up immediately, otherwise sending cans will stop conveying automatically.
5, old sand roasting: to be entered by sending cans through the reclaimed sand of selection by winnowing temperature adjustment and join in roaster preheating chamber by the charge door of roaster, heated by pre-heating system, enable sand temperature reach more than 820 DEG C and (make the resin molding Thorough combustion of sand surface, and make sand crystal structure generation once phase-change, make the sand expansion coefficient after regeneration low), sand is come out of the stove and is entered boiling cooler after Thorough combustion, sand is under fluidized state, abundant and cold wind carries out heat exchange, make the abundant cool to room temperature of hot sand, shake out.
After testing, the technical indicator of the PEPSET resin sand prepared by the present invention: tensile strength: 1.0 ~ 1.3MPa, burning decrement (after adding resin): 0.8 ~ 1.3%.
Through the reclaimed sand of roasting and fresh sand clay content, moisture and burning decrement correction data in table 1.
Table 1, through reclaimed sand and fresh sand clay content, moisture and the burning decrement contrast table of roasting
| Clay content | Moisture | Burning decrement (not adding resin) | |
| Fresh sand | Be less than 0.2% | 0.1%～0.2% | 0.19%～0.34% |
| Reclaimed sand after roasting | Be less than 0.2% | 0.1%～0.2% | 0.2%～0.25% |
Claims (2)
1. the moulding of PEPSET resin and sand recycle a clean casting technique, it is characterized in that: be that raw material carries out PEPSET phenolic sand molding with molding sand, inserted by core in die cavity, and after utilizing automatic closer mould assembling, molten iron is cast; Knockout after formed product; Old sand enters antiquated sand regeneration treatment system; Sand through regeneration process adds in fresh sand and recycles as molding sand;
Wherein, described fresh sand is prepared from through following methods: sand 1000 weight portion, phenolic resins 5 ~ 10 weight portion, PIC 3 ~ 15 weight portion, tertiary amine catalyst 0.05 ~ 0.3 weight portion; First joined in phenolic resins by catalyst, then mix with sand, finally add PIC, total mixed time processed is 50 ~ 60 seconds;
Described tertiary amine catalyst is triethylamine, dimethyl amine or wopropyl ethyl amine;
Antiquated sand regeneration treating method comprises the steps:
1), old sand reclaims: in the transition bucket that old sand, spill sand become the sand lump of bulk to drop into below shakeout by shakeout swing crushing, plate chain type bucket elevator is delivered to afterwards by jigging conveyer, risen in block sand sand storage by bucket elevator, sand in block sand sand storage is expected when reaching material level, reclaimer successively autostop from shakeout, completes old sand and reclaims;
2), breaking, regenerating: the agglomerate sand material in block sand sand storage evenly to vibro-crusher feed by quantitative oscillating feeder, in vibro-crusher, is mutually rubbed with the hands and ground fragmentation and preliminary demoulding; Fragmentation is greater than 2mm after sieving, be less than the waste material of 5mm enters waste trolley, transports shakeout back; The lump material being greater than 5mm is stayed in vibro-crusher, clears out system after shutdown; The sand grains being less than 2mm is transported in transition bucket, and the sand in transition bucket is delivered in regeneration sand storage through sending cans; Until regeneration sand storage material loading position is completely expected, antiquated sand regeneration treatment system is shut down automatically successively, completes broken working cycles of clashing into regeneration;
3), friction regeneration: the old sand from regeneration sand storage flow to friction regenerating device through sand sieving machine; In friction regenerating device, by high pressure positive blower air feed and through boiling device effect, old sand is suspended state, by the friction pulley two main shafts of driven by motor being provided with the manufacture of multiple high abrasion resisting material, during High Rotation Speed, the old sand of suspended state stirred, rub, resin molding is peeled off, is discharged by sand export; The air that high pressure positive blower blasts, is siphoned away by dust pelletizing system together with the resin molding peeled off, thus completes the thick level selection by winnowing of reclaimed sand, obtain clean reclaimed sand; Reclaimed sand is delivered to by compressed air in the sand storage above selection by winnowing temperature adjustment after boiling cooling bed cooling again, until material level is completely expected on this sand storage, antiquated sand regeneration treatment system is shut down automatically successively, completes the working cycles of friction regeneration;
4), the selection by winnowing temperature adjustment of reclaimed sand: the sand storage of reclaimed sand above selection by winnowing temperature adjustment flow to winnowing machine multilayer plate of turning back and form very thin one deck sand flow curtain, and the air that dedusting fan sucks forms certain wind speed at sand flow curtain place, the dust micro mist suction in sand is walked; Sand evenly moves down lentamente and fully contacts cooling with heat exchanging fins under the throttling action of throttling adjusting amount of board, enters sending cans after arriving the temperature of technological requirement;
5), old sand roasting: to be entered by sending cans through the reclaimed sand of selection by winnowing temperature adjustment and join in roaster preheating chamber by the charge door of roaster, heated by pre-heating system, sand temperature is made to reach more than 820 DEG C, sand is come out of the stove and is entered boiling cooler after Thorough combustion, sand is under fluidized state, abundant and cold wind carries out heat exchange, makes the abundant cool to room temperature of hot sand, shakes out.
2. PEPSET resin moulding as claimed in claim 1 and sand recycle clean casting technique, it is characterized in that in old sand recycling step, being provided with suspended magnetic separator for removing iron filings above jigging conveyer sand export.
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| CN109702142A (en) * | 2019-01-17 | 2019-05-03 | 上柴动力海安有限公司 | A kind of resin sand production recovery of circulatory system |
| CN110252939A (en) * | 2019-06-03 | 2019-09-20 | 启东宇杰雕塑有限公司 | A kind of sand mold mould regenerating resin sand and its preparation process |
| CN111451439A (en) * | 2020-05-09 | 2020-07-28 | 合肥仁创铸造材料有限公司 | Regeneration method of Papu resin used sand |
| CN111531124B (en) * | 2020-06-18 | 2021-06-29 | 广东峰华卓立科技股份有限公司 | Automatic control system and control method for sand mold three-dimensional printer |
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Denomination of invention: PEPSET resin molding and sand recycling clean casting process Effective date of registration: 20220622 Granted publication date: 20160120 Pledgee: Postal Savings Bank of China Limited Laizhou sub branch Pledgor: LAIZHOU XINZHONGYAO MACHINERY Co.,Ltd. Registration number: Y2022980008617 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230711 Granted publication date: 20160120 Pledgee: Postal Savings Bank of China Limited Laizhou sub branch Pledgor: LAIZHOU XINZHONGYAO MACHINERY Co.,Ltd. Registration number: Y2022980008617 |