CN103934411A - PEPSET resin moulding and sand cyclic utilization clean casting technology - Google Patents
PEPSET resin moulding and sand cyclic utilization clean casting technology Download PDFInfo
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- CN103934411A CN103934411A CN201410112236.4A CN201410112236A CN103934411A CN 103934411 A CN103934411 A CN 103934411A CN 201410112236 A CN201410112236 A CN 201410112236A CN 103934411 A CN103934411 A CN 103934411A
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Abstract
The invention relates to a PEPSET resin moulding and sand cyclic utilization clean casting technology. The technology comprises the following steps: using raw materials to carry out PEPSET resin sand moulding: putting a sand core into a mould cavity, closing the mould cavity by using an automatic mould closer, then casting with molten iron; shaking out the sands after the moulding of product; transferring the old sands into a waste sand regeneration processing system; wherein the regenerated sands can be applied to a cold box core blower to manufacture sand cores, thus the addition amount of new sands is reduced, and the cyclic utilization of old sands is achieved.
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 is react gradually and harden, while starting to react, sand can be clamminess, poor fluidity.On the other hand, furane resins are more responsive to environment temperature, and when temperature is low, setting rate is just slow, and when temperature or sand temperature are when too high, setting rate is too fast, can have little time moulding.Meanwhile, contain sulphur and nitrogen in furane resins, sulphur wherein can infiltrate cast(ing) surface, affects the nodularization rate of cast(ing) surface; Nitrogen is a main cause that causes 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:
The moulding of PEPSET resin and sand recycle a clean casting technique, it is characterized in that: the molding sand of take carries out PEPSET phenolic sand molding as raw material, and core is inserted in die cavity, utilize after automatic closer mould assembling molten iron casting; Knockout after formed product; Old sand enters antiquated sand regeneration treatment system; The sand of processing through regeneration adds in fresh sand and recycles as molding sand;
Wherein, described fresh sand is prepared from through following methods: sand 1000 weight portions, phenolic resins 5～10 weight portions, PIC 3～15 weight portions, tertiary amine catalyst 0.05～0.3 weight portion; First catalyst is joined in phenolic resins, then mix with sand, finally add PIC, always the mixed time processed is 50～60 seconds.
Described tertiary amine catalyst is preferably triethylamine, dimethyl amine or isopropyl ethamine.
Antiquated sand regeneration treating method comprises the steps:
1), old sand reclaims: old sand, spill sand become the sand lump of bulk to drop in the transition bucket of shakeout below by shakeout swing crushing, by jigging conveyer, be delivered to plate chain type bucket elevator afterwards, by bucket elevator, risen in piece sand sand storage, sand in piece sand sand storage is expected while reaching material level, reclaimer starts successively autostop from shakeout, completes old sand and reclaims;
2), breaking, regenerating: the agglomerate sand material in piece sand sand storage,, is mutually rubbed with the hands and ground broken and preliminary demoulding evenly to vibro-crusher feed by quantitative oscillating feeder in vibro-crusher; The waste material that fragmentation is greater than 2mm after sieving, be less than 5mm enters waste trolley, transports shakeout back; The lump material that is greater than 5mm is stayed in vibro-crusher, clears out system after shutdown; The sand grains that is less than 2mm is transported in transition bucket, and the sand in transition bucket is delivered in regeneration sand storage through sending cans; Until regenerate, completely expect sand storage material loading position, and regenerative system is shut down automatically successively, completes broken operation cycle 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, the friction pulley that a plurality of high abrasion resisting materials are manufactured is installed on two main shafts by driven by motor, during High Rotation Speed, the old sand of suspended state is stirred, rubbed, resin molding is peeled off, by sand export, discharged.The air that blower fan blasts, is siphoned away by dust pelletizing system together with the resin molding of peeling off, thereby completes the thick level selection by winnowing of reclaimed sand, obtains clean reclaimed sand; Reclaimed sand after boiling cooling bed is cooling more compressed air deliver in the sand storage of selection by winnowing temperature adjustment top, until material level is completely expected on this sand storage, regenerative system is shut down automatically successively, completes the operation cycle of friction regeneration;
4), the selection by winnowing temperature adjustment of reclaimed sand: reclaimed sand flow to the 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, and the dust micro mist in sand is aspirated away; Sand evenly moves down lentamente and fully contacts coolingly with heat exchange blade under the throttling action of throttling adjusting amount of board, enters sending cans after arriving the temperature of technological requirement;
5), old sand roasting: the charge door being entered by sending cans by roaster through the reclaimed sand of selection by winnowing temperature adjustment joins in roaster preheating chamber, by pre-heating system, heated, sand temperature is reached more than 820 ℃, sand is through fully coming out of the stove and enter boiling cooler after burning, 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, jigging conveyer sand export top is provided with suspended magnetic separator for removing iron filings.
In breaking, regenerating step, quantitatively the coordination of oscillating feeder, disintegrating machine, bucket elevator work is realized quantitatively automatically by three partial circulatings:
The level-sensing device of a, disintegrating machine shows that, while completely expecting, quantitatively oscillating feeder suspends, until show without again starting after material time delay;
When before b, disintegrating machine, the level-sensing device of transition bucket sends full material signal, quantitative oscillating feeder, disintegrating machine be autostop successively;
C, by the time level-sensing device after without material time delay, then starts automatically successively, coordinates the work of disintegrating machine and bucket elevator, assurance
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; During debugging, need to require to adjust according to the productivity ratio of cooler the productivity ratio of amount adjusting valve, aidr bells blast system, transmitting system, to guarantee that selection by 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 stop up, when occurring that on cooler, material level is completely expected, the empty material of lower material level, sends fault-signal, represents that filter screen stops up, after clearing up immediately, just can resume work, otherwise sending cans will stop carrying 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; The prepared resin sand free-running property of the present invention is good, is easy to mechanical back-up sand, and surface finish of casting is good, and dimensional accuracy is high; Because the prepared resin sand curing rate of the present invention is fast and evenly, hard property is good thoroughly, therefore has better demolding performace and elevated temperature strength, maximum 7 minutes of demould time adopts minimum 20 minutes of other technique demould times such as furans, and production efficiency has improved 3 times; In addition, core of the present invention (type) collapsibility is good and be easy to regeneration, can effectively reduce crack defect.
The second, the present invention has adopted unique reclaimed sand cyclic utilization system, the old sand rate of recovery is high, demoulding is effective, make more than 95% antiquated sand can regeneration, in reuse process, greatly reduce fresh sand addition, realize saving and the circulation of resource and reclaimed use, can effectively 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, and machinery is regenerated to old sand after hot method roasting regeneration, can as fresh sand, use completely; Fresh sand particle surface after roasting is smooth, even particle size distribution, and micro mist is few, can significantly save fresh sand; Old sand after roasting can be directly used in the coremaking sand of cold core coremaking line simultaneously.
Four, the present invention adopts resin moulding and sand recycle clean casting technique, do not produce the pernicious gases 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 be saved 1.5 tons of left and right of fresh sand, has really realized energy-conserving and environment-protective.
The specific embodiment
Below in conjunction with instantiation, further illustrate the present invention.
Casting technique of the present invention comprises that take molding sand carries out PEPSET phenolic sand molding as raw material, and core is inserted in die cavity, utilizes after automatic closer mould assembling molten iron casting.Knockout after formed product.Old sand enters antiquated sand regeneration treatment system, and the sand of processing through regeneration can be used for cold-box core blower and makes core, has reduced adding of fresh sand in coremaking process, has realized recycling of old sand.
Wherein, fresh sand preparation example used is as follows:
Preparation example one
Sand 1000 weight portions, phenolic resins 5 weight portions, PIC 15 weight portions, 0.3 part of tertiary amine catalyst.
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 after puddle mixer start and shutdown; (a sand and tailings, must not the surpass 2kg) sand producing can not participate in moulding.The impact residual sand carrying out working properly does not have in puddle mixer after shutting down.
Preparation example two
Sand 1000 weight portions, phenolic resins 8 weight portions, PIC 8 weight portions, 0.3 part of tertiary amine catalyst.
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 after puddle mixer start and shutdown; (a sand and tailings, must not the surpass 2kg) sand producing can not participate in moulding.The impact residual sand carrying out working properly does not have in puddle mixer after shutting down.
Preparation example three
Sand 1000 weight portions, phenolic resins 10 weight portions, PIC 3 weight portions, 0.05 part of tertiary amine catalyst.
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 after puddle mixer start and shutdown; (a sand and tailings, must not the surpass 2kg) sand producing can not participate in moulding.The impact residual sand carrying out working properly does not have in puddle mixer after shutting down.
Antiquated sand regeneration treating method of the present invention comprises the steps:
1, old sand reclaims: old sand, spill sand become the sand lump of bulk to drop in the transition bucket of shakeout below by shakeout swing crushing; by jigging conveyer, be delivered to plate chain type bucket elevator afterwards; by bucket elevator, risen in piece sand sand storage; sand in piece sand sand storage is expected while reaching material level; reclaimer starts successively autostop from shakeout; complete old sand and reclaim, shakeout stops knockout.
Jigging conveyer sand export top is provided with suspended magnetic separator for removing iron filings.
2, breaking, regenerating: the agglomerate sand material in piece sand sand storage,, is mutually rubbed with the hands and ground broken and preliminary demoulding evenly to vibro-crusher feed by quantitative oscillating feeder in vibro-crusher.The waste material that fragmentation is greater than 2mm after sieving, be less than 5mm enters waste trolley, transports shakeout back; The lump material that is greater than 5mm is stayed in vibro-crusher, clears out system after shutdown; The sand grains that is less than 2mm is transported in transition bucket, and the sand in transition bucket is delivered in regeneration sand storage through sending cans.Until regenerate, completely expect sand storage material loading position, and regenerative system is shut down automatically successively, completes broken operation cycle of clashing into regeneration.
Wherein quantitatively the coordination of oscillating feeder, disintegrating machine, bucket elevator work is realized quantitatively automatically by three partial circulatings:
The level-sensing device of a, disintegrating machine shows that, while completely expecting, quantitatively oscillating feeder suspends, until show without again starting after material time delay.
When before b, disintegrating machine, the level-sensing device of transition bucket sends full material signal, quantitative oscillating feeder, disintegrating machine be autostop successively.By the time level-sensing device is expected after also time delay in nothing, more automatically starts successively, coordinates the work of disintegrating machine and bucket elevator, the normal work of assurance 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 according to productivity ratio, require to adjust the productivity ratio of 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, the friction pulley that a plurality of high abrasion resisting materials are manufactured is installed on two main shafts by driven by motor, during High Rotation Speed, the old sand of suspended state is stirred, rubbed, resin molding is peeled off, by sand export, discharged.The air that blower fan blasts, is siphoned away by dust pelletizing system together with the resin molding of peeling off, thereby completes the thick level selection by winnowing of reclaimed sand, obtains clean reclaimed sand.
Reclaimed sand after boiling cooling bed is cooling more compressed air deliver in the sand storage of selection by winnowing temperature adjustment top, until material level is completely expected on this sand storage, regenerative system is shut down automatically successively, completes the operation cycle of friction regeneration.
When the transition bucket of friction after regenerating device completely expected, two moving above friction regenerating device adds sand valve and automatically closes.
4, the selection by winnowing temperature adjustment of reclaimed sand: reclaimed sand flow to the 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, and the dust micro mist in sand is aspirated away.Sand evenly moves down lentamente and fully contacts coolingly with heat exchange blade under the throttling action of throttling adjusting amount of board, enters sending cans after arriving the temperature (sand temperature≤40 ℃) of technological requirement.
For guaranteeing the co-ordination of whole system, the present invention is also provided with several heavy partial circulatings:
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.
In b, when debugging, need to require to adjust according to the productivity ratio of cooler the productivity ratio of amount adjusting valve, aidr bells blast system, transmitting system, to guarantee that selection by winnowing process fully gets rid of micro mist, the abundant heat exchange of cooling system.
Between c, cooling temperature adjustment and selection by winnowing, filter screen is set in case foreign material stop up, when occurring that on cooler, material level is completely expected, the empty material of lower material level, sends fault-signal, represents that filter screen stops up, after clearing up immediately, just can resume work, otherwise sending cans will stop carrying automatically.
?5, old sand roasting: the charge door being entered by sending cans by roaster through the reclaimed sand of selection by winnowing temperature adjustment joins in roaster preheating chamber, by pre-heating system, heated, making sand temperature reach 820 ℃ (can fully burn the resin molding of sand surface above, and make sand crystal structure generation once phase-change, make regeneration after sand expansion coefficient low), sand is through fully coming out of the stove and enter boiling cooler after burning, 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 that the present invention is prepared: tensile strength: 1.0～1.3MPa, burning decrement (after adding resin): 0.8～1.3%.
The reclaimed sand of process roasting and fresh sand clay content, moisture and burning decrement correction data are 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 (6)
1. the moulding of PEPSET resin and sand recycle a clean casting technique, it is characterized in that: the molding sand of take carries out PEPSET phenolic sand molding as raw material, and core is inserted in die cavity, utilize after automatic closer mould assembling molten iron casting; Knockout after formed product; Old sand enters antiquated sand regeneration treatment system; The sand of processing through regeneration adds in fresh sand and recycles as molding sand;
Wherein, described fresh sand is prepared from through following methods: sand 1000 weight portions, phenolic resins 5～10 weight portions, PIC 3～15 weight portions, tertiary amine catalyst 0.05～0.3 weight portion; First catalyst is joined in phenolic resins, then mix with sand, finally add PIC, always the mixed time processed is 50～60 seconds.
2. PEPSET resin as claimed in claim 1 moulding and sand recycle clean casting technique, it is characterized in that: described tertiary amine catalyst is triethylamine, dimethyl amine or isopropyl ethamine.
3. PEPSET resin as claimed in claim 1 or 2 moulding and sand recycle clean casting technique, it is characterized in that antiquated sand regeneration treating method comprises the steps:
1), old sand reclaims: old sand, spill sand become the sand lump of bulk to drop in the transition bucket of shakeout below by shakeout swing crushing, by jigging conveyer, be delivered to plate chain type bucket elevator afterwards, by bucket elevator, risen in piece sand sand storage, sand in piece sand sand storage is expected while reaching material level, reclaimer starts successively autostop from shakeout, completes old sand and reclaims;
2), breaking, regenerating: the agglomerate sand material in piece sand sand storage,, is mutually rubbed with the hands and ground broken and preliminary demoulding evenly to vibro-crusher feed by quantitative oscillating feeder in vibro-crusher; The waste material that fragmentation is greater than 2mm after sieving, be less than 5mm enters waste trolley, transports shakeout back; The lump material that is greater than 5mm is stayed in vibro-crusher, clears out system after shutdown; The sand grains that is less than 2mm is transported in transition bucket, and the sand in transition bucket is delivered in regeneration sand storage through sending cans; Until regenerate, completely expect sand storage material loading position, and regenerative system is shut down automatically successively, completes broken operation cycle 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, the friction pulley that a plurality of high abrasion resisting materials are manufactured is installed on two main shafts by driven by motor, during High Rotation Speed, the old sand of suspended state is stirred, rubbed, resin molding is peeled off, by sand export, discharged;
The air that blower fan blasts, is siphoned away by dust pelletizing system together with the resin molding of peeling off, thereby completes the thick level selection by winnowing of reclaimed sand, obtains clean reclaimed sand; Reclaimed sand after boiling cooling bed is cooling more compressed air deliver in the sand storage of selection by winnowing temperature adjustment top, until material level is completely expected on this sand storage, regenerative system is shut down automatically successively, completes the operation cycle of friction regeneration;
4), the selection by winnowing temperature adjustment of reclaimed sand: reclaimed sand flow to the 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, and the dust micro mist in sand is aspirated away; Sand evenly moves down lentamente and fully contacts coolingly with heat exchange blade under the throttling action of throttling adjusting amount of board, enters sending cans after arriving the temperature of technological requirement;
5), old sand roasting: the charge door being entered by sending cans by roaster through the reclaimed sand of selection by winnowing temperature adjustment joins in roaster preheating chamber, by pre-heating system, heated, sand temperature is reached more than 820 ℃, sand is through fully coming out of the stove and enter boiling cooler after burning, 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.
4. PEPSET resin as claimed in claim 3 moulding and sand recycle clean casting technique, it is characterized in that in old sand recycling step, and jigging conveyer sand export top is provided with suspended magnetic separator for removing iron filings.
5. PEPSET resin as claimed in claim 3 moulding and sand recycle clean casting technique, it is characterized in that in breaking, regenerating step, and quantitatively the coordination of oscillating feeder, disintegrating machine, bucket elevator work is realized quantitatively automatically by three partial circulatings:
The level-sensing device of a, disintegrating machine shows that, while completely expecting, quantitatively oscillating feeder suspends, until show without again starting after material time delay;
When before b, disintegrating machine, the level-sensing device of transition bucket sends full material signal, quantitative oscillating feeder, disintegrating machine be autostop successively;
C, by the time level-sensing device after without material time delay, then starts automatically successively, coordinates the work of disintegrating machine and bucket elevator, assurance
The normal work of disintegrating machine.
6. PEPSET resin as claimed in claim 3 moulding and sand recycle clean casting technique, it is characterized in that: 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; During debugging, need to require to adjust according to the productivity ratio of cooler the productivity ratio of amount adjusting valve, aidr bells blast system, transmitting system, to guarantee that selection by 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 stop up, when occurring that on cooler, material level is completely expected, the empty material of lower material level, sends fault-signal, represents that filter screen stops up, after clearing up immediately, just can resume work, otherwise sending cans will stop carrying automatically.
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| CN104759583A (en) * | 2015-03-18 | 2015-07-08 | 兰贤光 | Simple used resin sand regeneration treatment device system |
| CN105728641A (en) * | 2016-03-01 | 2016-07-06 | 潍柴动力股份有限公司 | Regeneration method of casting wet type mixed old sand |
| CN106623770A (en) * | 2016-12-22 | 2017-05-10 | 浙江品川精密机械有限公司 | Casting resin sand regeneration production line |
| CN107163212A (en) * | 2017-04-25 | 2017-09-15 | 中国第汽车股份有限公司 | It is a kind of for resin combination of automobile nodular iron casting and preparation method thereof |
| CN108296430A (en) * | 2017-08-25 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of recycling cast waste sand technique |
| CN109128026A (en) * | 2018-10-11 | 2019-01-04 | 嵊州市华明机械铸造股份有限公司 | A kind of method of iron ball casting |
| 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 |
| CN111531124A (en) * | 2020-06-18 | 2020-08-14 | 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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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104759583A (en) * | 2015-03-18 | 2015-07-08 | 兰贤光 | Simple used resin sand regeneration treatment device system |
| CN105728641A (en) * | 2016-03-01 | 2016-07-06 | 潍柴动力股份有限公司 | Regeneration method of casting wet type mixed old sand |
| CN106623770A (en) * | 2016-12-22 | 2017-05-10 | 浙江品川精密机械有限公司 | Casting resin sand regeneration production line |
| CN107163212A (en) * | 2017-04-25 | 2017-09-15 | 中国第汽车股份有限公司 | It is a kind of for resin combination of automobile nodular iron casting and preparation method thereof |
| CN108296430A (en) * | 2017-08-25 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of recycling cast waste sand technique |
| CN109128026A (en) * | 2018-10-11 | 2019-01-04 | 嵊州市华明机械铸造股份有限公司 | A kind of method of iron ball casting |
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| CN103934411B (en) | 2016-01-20 |
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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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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 |