CN103990767B - A kind of hot core shell precoated sand formative technology - Google Patents
A kind of hot core shell precoated sand formative technology Download PDFInfo
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- CN103990767B CN103990767B CN201410223348.7A CN201410223348A CN103990767B CN 103990767 B CN103990767 B CN 103990767B CN 201410223348 A CN201410223348 A CN 201410223348A CN 103990767 B CN103990767 B CN 103990767B
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Abstract
The invention provides a kind of hot core shell precoated sand formative technology, it comprises the following steps successively: core shooting, mould assembling, training sand, shake, vacuumize.Be specially: make casting mold blank by hot core shell shell molding machine, control the wall thickness of casting mold blank at 4-5mm; Casting mold blank and core shell are assembled; Parallel arranged is positioned among sandbox in order, and fills antiquated sand in casting mold surrounding; By plain jolter, training sand is carried out vibrations to compress; The vacuum port of sandbox is connected on vacuum machine, opens vacuum machine, make to form vacuum atmosphere in sandbox, make casting mold and complete.The good product quality that this formative technology cost is low, efficiency is high, environmental pollution is little, make.
Description
Technical field
The present invention relates to machine casting technical field, be specifically related to a kind of hot core shell precoated sand formative technology.
Background technology
Resin sand casting adopts quartz to be base-material, resin curing agent is binding agent, by the effect of resin curing agent, quartz solidified thus form casting mold, the iron sand ratio of this forging type is general at about 1:4, its casting and molding cost is greater than 1500 yuan/ton, the more difficult formation pipelining of domestic this kind of forging type, because phenolic sand molding pipelining equipment factory building drops into greatly, the mode moulding of many employings semi-hand, rely on high to the qualification of workman, moulding efficiency is extremely low, 1 ton of foundry goods/12 hours per capita.
In recent years occurred a kind of hot core shell precoated sand formative technology, the precoated sand of overlay film to be injected by core-shooting device in the mould that heated by this technique, and precoated sand reaches the effect of solidification by heating.This kind of forging type easily forms pipelining, and moulding efficiency is high, lower to the dependence of workman's qualification, and relative moulding cost is lower, and roughly at about 1200 yuan/ton, moulding efficiency is 3 tons of foundry goods/12 hours per capita.Weak point is that die cavity gas forming amount is too large, and because the wall thickness of die cavity is between 15-30mm, the gas that die cavity produces not easily is discharged, and cause product to occur pore, the casting flaw such as hollow, production process is wayward.
Summary of the invention
Technical problem to be solved by this invention is for above the deficiencies in the prior art, provides that a kind of cost is low, efficiency is high, environmental pollution is little, the hot core shell precoated sand formative technology of good product quality.
The technical solution adopted in the present invention is:
A kind of hot core shell precoated sand formative technology, this technique comprises the following steps successively: core shooting, mould assembling, training sand, shake, vacuumize.
Described core shooting specifically refers to by hot core shell shell molding machine, fixed mould on hot core shell shell molding machine, by the effect of air pressure precoated sand injected after the nozzle of hot core shell shell molding machine is aimed at the loophole on mould in the mould of having heated, take out after waiting for precoated sand sclerosis, form casting mold blank, control the wall thickness of casting mold blank at 4-5mm.
Described mould assembling specifically refers to assembles the casting mold blank made and core shell.
Described training sand specifically refer to by the casting mold blank assembled in order parallel arranged be positioned among sandbox, and casting mold surrounding fill antiquated sand.
Training sand is carried out vibrations specifically by plain jolter and compresses by described vibrations, makes training sand tightly wrap up casting mold blank.
Described vacuumizing specifically refers to and is connected on vacuum machine by the vacuum port of sandbox, opens vacuum machine, makes to form vacuum atmosphere in sandbox, makes casting mold and completes.Now can regard a large casting mold in whole sandbox as, precoated sand casting mold forms block mold with training sand under the effect of vacuum, and vacuum makes mould strength in whole sandbox improve once, even if precoated sand mould wall its intensity thin also can stand washing away of molten steel.
Described vacuumizing lasts till casting complete, because vacuum makes mould strength increase.Casting mold of the present invention is when pouring into a mould, and molten steel is full of casting mold, and form product, the gas that casting mold sends and flue dust siphon away through vacuum, and gas can not enter molten steel, does not also pollute the environment.
Compared with prior art, the present invention has following remarkable advantage and beneficial effect:
The present invention adopts the moulding of precoated sand core shooting, control casting mold wall thickness at 4-5mm, before cast, die cavity is positioned among fixed dimension sandbox, surrounding antiquated sand is filled and ram-jolt, before cast, whole sandbox is vacuumized, training sand strength enhancing in the effect drag box of vacuum, even if cavity wall thickness is at 4-5mm, also can keep out washing away of molten steel.Due to the relation that wall thickness is very thin, the gas forming amount of die cavity greatly reduces, only surplus gas forming amount siphon away by vacuum, so plant moulding pouring type without the need to considering the problem of gas forming amount.After wall thickness control, the iron sand of casting mold is than about 3:1 to 4:1.Also just because of the reduction of wall thickness, in core shooting process, die cavity will harden in the short period of time, and the fabrication cycle of die cavity shortens greatly, and operating efficiency greatly improves, and moulding efficiency is 5 tons of foundry goods/12 hours per capita.
The present invention's hot core shell precoated sand formative technology cost low (moulding cost is lower than 500 yuan/ton), gas forming amount low (product surface can not form the defects such as pore), easily form pipelining, easy to control without excessive demand, production process to the qualification of workman, be suitable for and promote.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described in detail.Iting is noted that following illustrating is all exemplary, being intended to the invention provides further instruction.Except as otherwise noted, all Science and Technology terms that the present invention uses have the identical meanings usually understood with the technical field of the invention personnel.
Embodiment 1:
A kind of hot core shell precoated sand formative technology, comprises the following steps successively: core shooting, mould assembling, training sand, shake, vacuumize.
Detailed process is as follows: by hot core shell shell molding machine, fixed mould on hot core shell shell molding machine, by the effect of air pressure precoated sand injected after the nozzle of hot core shell shell molding machine is aimed at the loophole on mould in the mould of having heated, take out after waiting for precoated sand sclerosis, form casting mold blank, control the wall thickness of casting mold blank at 4mm; The casting mold blank made and core shell are assembled; The rear casting mold blank of assembling in order parallel arranged is positioned among sandbox, and fills antiquated sand in casting mold surrounding; Then compressed by plain jolter vibrations, training sand is carried out vibrations and compress, make training sand tightly wrap up casting mold blank; Finally be connected on vacuum machine by the vacuum port of sandbox, open vacuum machine, make to form vacuum atmosphere in sandbox, make casting mold and complete, now the hardness of casting mold is 93.
Embodiment 2:
A kind of hot core shell precoated sand formative technology, comprises the following steps successively: core shooting, mould assembling, training sand, shake, vacuumize.
Detailed process is as follows: by hot core shell shell molding machine, fixed mould on hot core shell shell molding machine, by the effect of air pressure precoated sand injected after the nozzle of hot core shell shell molding machine is aimed at the loophole on mould in the mould of having heated, take out after waiting for precoated sand sclerosis, form casting mold blank, control the wall thickness of casting mold blank at 4.5mm; The casting mold blank made and core shell are assembled; The rear casting mold blank of assembling in order parallel arranged is positioned among sandbox, and fills antiquated sand in casting mold surrounding; Then compressed by plain jolter vibrations, training sand is carried out vibrations and compress, make training sand tightly wrap up casting mold blank; Finally be connected on vacuum machine by the vacuum port of sandbox, open vacuum machine, make to form vacuum atmosphere in sandbox, it is 94 that making casting mold completes now mould hardness.
Embodiment 3:
A kind of hot core shell precoated sand formative technology, comprises the following steps successively: core shooting, mould assembling, training sand, shake, vacuumize.
Detailed process is as follows: by hot core shell shell molding machine, fixed mould on hot core shell shell molding machine, by the effect of air pressure precoated sand injected after the nozzle of hot core shell shell molding machine is aimed at the loophole on mould in the mould of having heated, take out after waiting for precoated sand sclerosis, form casting mold blank, control the wall thickness of casting mold blank at 4.8mm; The casting mold blank made and core shell are assembled; The rear casting mold blank of assembling in order parallel arranged is positioned among sandbox, and fills antiquated sand in casting mold surrounding; Then compressed by plain jolter vibrations, training sand is carried out vibrations and compress, make training sand tightly wrap up casting mold blank; Finally be connected on vacuum machine by the vacuum port of sandbox, open vacuum machine, make to form vacuum atmosphere in sandbox, make casting mold and complete, now mould hardness is 93.
The above embodiment of the present invention can not be used for limiting the present invention to explanation of the present invention, and any change in the implication suitable with claims of the present invention and scope, all should think to be included in the scope of claims.
Claims (5)
1. a hot core shell precoated sand formative technology, is characterized in that: comprise the following steps successively: core shooting, mould assembling, training sand, shake, vacuumize; Described core shooting refers to by hot core shell shell molding machine, fixed mould on hot core shell shell molding machine, by the effect of air pressure precoated sand injected after the nozzle of hot core shell shell molding machine is aimed at the loophole on mould in the mould of having heated, take out after waiting for precoated sand sclerosis, form casting mold blank, control the wall thickness of casting mold blank at 4-5mm.
2. one according to claim 1 hot core shell precoated sand formative technology, is characterized in that: described mould assembling refers to assembles the casting mold blank made and core shell.
3. one according to claim 2 hot core shell precoated sand formative technology, is characterized in that: described training sand refer to by the casting mold blank assembled in order parallel arranged be positioned among sandbox, and casting mold surrounding fill antiquated sand.
4. one according to claim 3 hot core shell precoated sand formative technology, is characterized in that: described vibrations compress for training sand being carried out vibrations by plain jolter, make training sand tightly wrap up casting mold blank.
5. one according to claim 4 hot core shell precoated sand formative technology, is characterized in that: described in vacuumize and refer to the vacuum port of sandbox is connected on vacuum machine, open vacuum machine, make to form vacuum atmosphere in sandbox, make casting mold and complete.
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| CN201410223348.7A CN103990767B (en) | 2014-05-23 | 2014-05-23 | A kind of hot core shell precoated sand formative technology |
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| CN201410223348.7A CN103990767B (en) | 2014-05-23 | 2014-05-23 | A kind of hot core shell precoated sand formative technology |
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| CN103990767A CN103990767A (en) | 2014-08-20 |
| CN103990767B true CN103990767B (en) | 2016-04-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104588581A (en) * | 2015-01-20 | 2015-05-06 | 江西弘旺汽车制动器制造有限公司 | Manufacturing method of brake drum |
Citations (5)
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|---|---|---|---|---|
| US4742863A (en) * | 1986-07-07 | 1988-05-10 | Witt Raymond H | Mold for sand casting varying thickness articles |
| CN101020226A (en) * | 2007-03-15 | 2007-08-22 | 繁昌县金贸铸造有限责任公司 | Flange casting process |
| CN102896281A (en) * | 2012-09-28 | 2013-01-30 | 河北炊花铸造有限公司 | Hot-box core shooter with negative pressure pumping system |
| CN102896299A (en) * | 2012-09-28 | 2013-01-30 | 河北科技大学 | Production technology for casting thin-wall cookware through using precoated sand hot box method |
| CN103212669A (en) * | 2012-01-20 | 2013-07-24 | 天津市瑞普天晟汽车零部件制造有限公司 | Lost-foam casting model of engine cylinder body and casting method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2764661B2 (en) * | 1991-05-17 | 1998-06-11 | 新東工業株式会社 | Mold casting method and equipment |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4742863A (en) * | 1986-07-07 | 1988-05-10 | Witt Raymond H | Mold for sand casting varying thickness articles |
| CN101020226A (en) * | 2007-03-15 | 2007-08-22 | 繁昌县金贸铸造有限责任公司 | Flange casting process |
| CN103212669A (en) * | 2012-01-20 | 2013-07-24 | 天津市瑞普天晟汽车零部件制造有限公司 | Lost-foam casting model of engine cylinder body and casting method |
| CN102896281A (en) * | 2012-09-28 | 2013-01-30 | 河北炊花铸造有限公司 | Hot-box core shooter with negative pressure pumping system |
| CN102896299A (en) * | 2012-09-28 | 2013-01-30 | 河北科技大学 | Production technology for casting thin-wall cookware through using precoated sand hot box method |
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