CN1326646C - Vacuum pump impeller integral casting process - Google Patents
Vacuum pump impeller integral casting process Download PDFInfo
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- CN1326646C CN1326646C CNB2005100033241A CN200510003324A CN1326646C CN 1326646 C CN1326646 C CN 1326646C CN B2005100033241 A CNB2005100033241 A CN B2005100033241A CN 200510003324 A CN200510003324 A CN 200510003324A CN 1326646 C CN1326646 C CN 1326646C
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Abstract
The present invention provides integral casting technology of a vacuum pump impeller. After numerically controlled machining is carried out to an integral mold prepared from a middle spacing plate, a blade and a wheel hub, the integral mold is molded by copper alloy. The sand core is arranged in a lower casting mold, a ceramic core is arranged on the sand core of an inner cavity, the top of an upper blade and the top of an upper wheel hub are provided with risers, the bottom surface and the shaft hole of a lower wheel hub are provided with external chills, and an inner pouring channel arranged on the bottom end of a lower blade is communicated with a direct pouring channel in the casting mold. Metal liquid enters the inner pouring channel by the direct pouring channel, and are led to a mold cavity by the bottom end of the lower blade to carry out bottom pouring; when the metal liquid reaches the tops of the risers from bottom to top, heat generating agents are added to the risers. After castings are cooled, boxes are opened, sand is removed, and casting heads are removed to carry out heat treatment. The present invention is suitable for casting various kinds of casting steel alloy. The impeller has high dimensional precision, equant uniformity and no weld seam, and the inner cavity of the wheel hub has no sand fusion or sintering, and casting structures are compact. The vacuum pump impeller has the advantages of eliminated welding stress influence, stable and reliable operation and long service life, the work efficiency reaches above 95%, and special work requirements of corrosion resistance and wear resistance can be satisfied.
Description
Technical field
The invention belongs to casting technology field, particularly a kind of vacuum pump impeller integral casting process.
Background technology
Vacuum pump impeller is because the dimensional accuracy height, and blade is thin and the two ends wheel hub is thick, and complex structure is so the monoblock cast difficulty is big.Therefore, adopt usually the steel plate welding fabrication and divide two sections castings after the manufacturing process of spicing forming type again.
The impeller of steel plate welding fabrication needs through operations such as blanking, processing bevel for welding, heat treatment, machinings, and the manufacturing cycle is long.Be difficult to guarantee weldquality during welding, because stress is concentrated equipment breakdown take place easily when causing impeller to run up.During the steel plate assembly welding, blade five equilibrium and integral wheel size are wayward, and the distortion that welding produces is difficult to correct.Therefore, the blade five equilibrium behind the steel plate welding fabrication is inhomogeneous, and the impeller size low precision makes its installation back work not steady, and efficient is low, and service life is short.Adopt the impeller of general sheet material welding more to be difficult to satisfy the needs of special operation such as anti-corrosion, wear-resisting.
Divide after two sections castings the impeller of spicing forming type again, need increase amalgamation face during welding, consumptive material is many, so increase impeller weight, reduction equipment operating efficiency.And when splicing, its amalgamation face is difficult to sealing, and working media easily enters the inner chamber of impeller hub and corrodes main shaft and bearing, causes vavuum pump short service life.
Because the special construction of vacuum pump impeller foundry goods, generally can only adopt the method for vertical cast during casting, though can be by riser feeding be set to the thick big wheel hub that is in the top final set, make top dense structure, but to the thick big wheel hub that is in the bottom final set because of taking the feeding measure, can not get the metal liquid feeding, and form shrinkage cavity, shrinkage porosite at last.During casting, the inner chamber of vacuum pump impeller wheel hub is because of all being surrounded by high-temperature metal liquid, and the general molding sand of use is difficult to resist cast and the temperatures involved about up to 1650 ℃ and being sintered when solidifying, and causes the difficult cleaning of root after the foundry goods moulding, causes and scraps.
Summary of the invention
The problems and the drawback that exist of the manufacturing process of spicing forming type again after the objective of the invention is to adopt the steel plate welding fabrication usually and divide two sections castings in sum vacuum pump impeller, a kind of impeller size precision height is provided, the foundry goods dense internal organization, the wheel hub inner chamber does not have scab, sintering, anti-corrosion, wear-resisting, reliable, the efficient height, long service life, the vacuum pump impeller integral casting process that cost is low.
Vacuum pump impeller integral casting process of the present invention prepares, joins sand molding, cast, sand removal, removal dead head, heat treatment link for basic in conjunction with the core box of routine.Adopt copper alloy, the place is provided with die joint along median septum, median septum and upper and lower blade and upper and lower wheel hub are prepared into integrally-built upper and lower mould respectively, and after numerical control machining center lathe programming processing, place respectively in the upper and lower sandbox, be copied into upper and lower casting mold and core with resin sand again, core places in the lower mold.
For the inner chamber molding sand of avoiding upper and lower wheel hub of the present invention at high temperature not by scab, sintering, in the core part at the inner chamber place of upper and lower wheel hub prefabricated ceramic core is set, and rising head is set on the top of blade and last wheel hub.For impelling lower hub place dense structure, prevent shrinkage cavity and shrinkage porosite phenomenon, make the cooling earlier of pouring metal melt relief foundry goods bottom, so the external chill that has chilling action and made by materials such as cast iron or carbon steel or stainless steels is set at the bottom surface and the axis hole place of lower end wheel hub.The bottom of lower blade of the present invention is provided with the ingate of high trapezoidal ring-type, and ingate is communicated with the sprue that is embedded into the interior side of casting mold.The molten metal of cast enters ingate via sprue, and the die cavity of introducing casting mold and core composition again through the lower blade bottom carries out bottom pour mold.When molten metal arrives the top of rising head from the bottom to top, pour into a mould and finish, promptly in rising head, add exothermic mixture, and prolong the feeding time of rising head inner metal liquid, guarantee that impeller casting of the present invention can constantly obtain replenishing of molten metal in whole process of setting.Treat to open sandbox after foundry goods all cools off, behind sand removal, removal dead head, heat-treat, and obtain dense internal organization of the present invention, and the satisfactory vacuum pump impeller single-casting of dimensional accuracy.
Vacuum pump impeller integral casting process of the present invention is adapted to the casting of various cast steel alloys, its impeller size precision height, even, the no weld seam of five equilibrium, the wheel hub inner chamber does not have scab, sintering, the welding stress influence has been eliminated by foundry goods dense structure, so operate steadily, safe and reliable, long service life, operating cost is low, and operating efficiency reaches more than 95%, especially can satisfy the needs of the industry such as chemical industry, pharmacy, food, electric power, mine of special operation such as anti-corrosion, wear-resisting.
Description of drawings
Fig. 1 is the mould assembly casting figure of vacuum pump impeller integral casting process of the present invention.
The specific embodiment
Below in conjunction with above-mentioned accompanying drawing example, vacuum pump impeller integral casting process of the present invention is made further enumeration.Vacuum pump impeller integral casting process of the present invention binds the core box that closes routine and prepares, joins sand molding, cast, sand removal, removal dead head, heat treatment link for basic, and with vacuum pump impeller φ (diameter) * H (height)=φ 720 * H730 (mm), upper and lower each 18～20 blade, it is embodiments of the invention that alloy material adopts ZG0Cr18Ni9, and vacuum pump impeller integral casting process of the present invention is described in detail.
Vacuum pump impeller of the present invention belongs to upper and lower symmetrical parts.Adopt copper alloy, thickness place along median septum 1/2 is provided with die joint, the median septum of 1/2 thickness and upper and lower blade 2 and upper and lower wheel hub 6 are prepared into integrally-built upper and lower mould respectively, and select VB-825 type numer centre lathe programming processing for use, the dimensional accuracy after its fine finishining can reach 0.003～0.005mm.The upper and lower mould of the tungsten/copper-alloy integrated structure after the fine finishining is placed in the prefabricated upper and lower sandbox 13, be copied into upper and lower casting mold 14 and core 8 with resin sand again.12 of casting mold die joints after the moulding are created on the die joint of mould naturally, promptly connect upper and lower blade 2 median septum 1 to the office, it has the effect of moulding, molding and following core.After placing core 8 in the lower mold 14, again upper mold 14 is closed on lower mold 14, and constitute whole casting mold 14.The die cavity that casting mold 14 and core 8 are formed becomes the die cavity that molten metal is filled integral wheel foundry goods of the present invention.
For the inner chamber molding sand of avoiding upper and lower wheel hub 6 of the present invention at high temperature not by scab, sintering, according to the shape of the inner chamber 7 in the upper and lower wheel hub 6, prefabricated wall thickness is the upper and lower ceramic core 3 of 10～15mm.When system core 8, prefabricated upper and lower ceramic core 3 is placed in the core box of core 8, insert resin sand again.Promptly be combined into integral sand core 8 naturally after core 8 demouldings with prefabricated upper and lower ceramic core 3.
Solidifying in proper order the present invention must strictly control pouring metal melt when the monoblock cast impeller after, therefore the top of blade 2 and last wheel hub 6 be provided with 2～3 diameters be on the rising head 4 of 2～2.5 times of wall thickness of wheel hub 6, cause molten metal to solidify in an orderly manner towards the direction of rising head 4 from bottom to up.Thereby reach vacuum pump impeller foundry goods of the present invention can both obtain molten metal in whole solidification and crystallization process by using feeding, and shrinkage cavity and shrinkage porosite in the foundry goods are introduced into all in the rising head 4 at last.Cleaning is during foundry goods, remove sprue 11, ingate 10 and rising head 4 after, promptly obtain fine and close and complete vacuum pump impeller foundry goods.
For strengthening the direction that vacuum pump impeller single-casting of the present invention solidifies in order, bottom surface and axis hole place in lower hub 6 are provided with the thickness of the lower hub 6 about length * wide * height=100 * 50 * 50% (mm) and have the cast iron of chilling action or the external chill 9 that materials such as carbon steel or stainless steel are made, and it lays spacing is 10～15mm.Because the heat storage coefficient of external chill 9 is greater than the heat storage coefficient of molding sand, behind the pouring metal melt, under the chilling action of external chill 9, the molten metal at lower hub 6 places must be early than the molten metal cooling earlier at other position.When solidified at lower hub 6 places, the molten metal of its required feeding can obtain the not solidified molten metal in top and constantly replenish, and makes vacuum pump impeller foundry goods of the present invention begin up to solidify from the bottom from bottom to up, thereby reaches the purpose that rising head 4 is later than casting solidification.
The bottom of lower blade 2 of the present invention is provided with the ingate 10-circle of high trapezoidal ring-type, it is avoided the Quench place of external chill 9 and is close to the bottom surface of lower hub 6, molten metal is introduced from the bottom of 18～20 lower blade 2 respectively, heat dispersing effectively, and the heat affecting at Quench place dropped to bottom line, thereby reach pouring metal melt steadily, do not have splash, oxidation and avoid the purpose of scour cast 14.
Ingate 10 of the present invention be embedded into casting mold 14 in the diameter of sides be that the sprue 11 that the ceramic material of 50mm is made is communicated with, the sectional area of ingate 10 is 1.2～1.5 times of sectional area of sprue 11.The molten metal of cast enters ingate 10 via sprue 11, introduce the die cavity that casting mold 14 and core 8 form again through the bottom of 18～20 lower blade 2 and carry out bottom pour mold, thereby the heat of dispersed metal liquid equably reduces the heat affecting to lower hub 6.
When molten metal of the present invention arrives the top of rising head 4 from the bottom to top, pour into a mould and finish, for strengthening the feeding effect of rising head 4, the exothermic mixture 5 that after cast finishes, promptly in rising head 4, adds 0.5～0.8kg casting usefulness, to prolong the setting time of rising head 4, help constantly to obtain in the whole process of setting of the present invention replenishing of molten metal.At last, treat to open sandbox 13 after foundry goods all cools off, behind sand removal, removal dead head, heat-treat, and obtain vacuum pump impeller single-casting of the present invention.
Claims (1)
1, a kind ofly prepare through core box, join sand molding, cast, sand removal, remove dead head, the vacuum pump impeller casting technique of heat treatment link, it is characterized in that adopting copper alloy, with median septum (1) and last, lower blade (2) and last, lower hub (6) be prepared into respectively integrally-built on, bed die, and after numerical control machining center lathe programming processing, place respectively, in the drag box (13), be copied into resin sand again, lower mold (14) and core (8), core (8) places in the lower mold (14), on, the core (8) that the inner chamber (7) of lower hub (6) is located is provided with prefabricated ceramic core (3), blade (2) is provided with rising head (4) with the top of last wheel hub (6), the bottom surface of lower hub (6) and axis hole place are provided with external chill (9), the bottom of lower blade (2) is provided with the ingate (10) of high trapezoidal ring-type, ingate (10) is communicated with the sprue (11) that is embedded in the interior side of casting mold (14) in advance, the molten metal of cast enters ingate (10) via sprue (11), the die cavity of introducing casting mold (14) and core (8) composition through the bottom of lower blade (2) carries out bottom pour mold again, when molten metal arrives the top of rising head (4) from the bottom to top, pour into a mould and finish, promptly in rising head (4), add exothermic mixture (5), treat at last to open sandbox (13) after foundry goods all cools off, through sand removal, heat-treat after removing dead head, and obtain the vacuum pump impeller single-casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100033241A CN1326646C (en) | 2005-12-13 | 2005-12-13 | Vacuum pump impeller integral casting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100033241A CN1326646C (en) | 2005-12-13 | 2005-12-13 | Vacuum pump impeller integral casting process |
Publications (2)
| Publication Number | Publication Date |
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| CN1775420A CN1775420A (en) | 2006-05-24 |
| CN1326646C true CN1326646C (en) | 2007-07-18 |
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| CNB2005100033241A Expired - Fee Related CN1326646C (en) | 2005-12-13 | 2005-12-13 | Vacuum pump impeller integral casting process |
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| FR2933884B1 (en) * | 2008-07-16 | 2012-07-27 | Snecma | PROCESS FOR MANUFACTURING AN AUBING PIECE |
| CN101787984B (en) * | 2010-01-22 | 2012-08-22 | 中国舰船研究设计中心 | Forward skewed multi-blade impeller with narrow cavity and integral casting technique thereof |
| CN103056599B (en) * | 2011-10-24 | 2015-10-28 | 沈阳黎明航空发动机(集团)有限责任公司 | The preparation method of the shaping loose piece of a kind of precision many continuous castings blade wax mould blade |
| CN103357822A (en) * | 2012-04-06 | 2013-10-23 | 遵义市凯航机械制造有限公司 | Nodular cast iron timing gear casting process |
| CN103878325B (en) * | 2012-12-19 | 2016-06-15 | 江苏华东风能科技有限公司 | The system for casting and pouring of hub of wind power generator foundry goods |
| CN103418991B (en) * | 2013-06-18 | 2015-09-23 | 沈阳三科水力机械制造有限公司 | The processing technology of large-scale two phase stainless steel impeller |
| CN103611875A (en) * | 2013-10-15 | 2014-03-05 | 湘潭新力机械有限公司 | Impeller air-lock valve impeller rotor production process |
| CN104014738B (en) * | 2014-05-28 | 2016-06-08 | 东风商用车有限公司 | A kind of casting thin channel combinatory core and using method thereof |
| CN104070136B (en) * | 2014-06-19 | 2016-06-01 | 宁夏共享装备有限公司 | The direct-cooled chill of a kind of castings of gray cast iron and iron casting casting |
| CN104141632B (en) * | 2014-07-25 | 2016-04-06 | 吉首长潭泵业有限公司 | Abrasion resistance alloy mortar pump impeller and manufacture method thereof |
| CN104265642B (en) * | 2014-09-12 | 2017-04-26 | 吉首长潭泵业有限公司 | Alloy mortar pump and part casting method thereof |
| CN104588591B (en) * | 2015-01-16 | 2016-11-23 | 遵义拓特铸锻有限公司 | Manufacture a kind of containment spray pump for nuclear power station martensitic stain less steel pump case product |
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| CN113275503B (en) * | 2021-04-08 | 2022-05-31 | 仙居东方液压机械有限公司 | Integral casting process of water-ring vacuum pump |
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| CN113426961A (en) * | 2021-05-25 | 2021-09-24 | 吉首长潭泵业有限公司 | Casting method of high-chromium alloy impeller |
| CN113798437B (en) * | 2021-10-18 | 2023-07-14 | 无锡灵通新材料有限公司 | Casting process of double-channel impeller made of duplex stainless steel |
| CN114799078B (en) * | 2022-04-01 | 2024-02-23 | 宁波日星铸业有限公司 | Die for manufacturing fan hub |
| CN115837456B (en) * | 2022-12-02 | 2023-06-06 | 中科力祥科技股份有限公司 | Thin-wall rotary part casting device and method based on aluminum alloy material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5973147A (en) * | 1982-10-18 | 1984-04-25 | Ebara Corp | Casting method |
| CN1089196A (en) * | 1992-03-21 | 1994-07-13 | 中国科学院长春光学精密机械研究所 | The integral precision casting technology for impeller of high-speed fan method |
| CN2542363Y (en) * | 2002-04-30 | 2003-04-02 | 无锡市南长区永兴机械制造厂 | Integral blade mould pressing die |
| JP2004090046A (en) * | 2002-08-30 | 2004-03-25 | Ebara Corp | Precision casting method, its cast product and rotary machine |
-
2005
- 2005-12-13 CN CNB2005100033241A patent/CN1326646C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5973147A (en) * | 1982-10-18 | 1984-04-25 | Ebara Corp | Casting method |
| CN1089196A (en) * | 1992-03-21 | 1994-07-13 | 中国科学院长春光学精密机械研究所 | The integral precision casting technology for impeller of high-speed fan method |
| CN2542363Y (en) * | 2002-04-30 | 2003-04-02 | 无锡市南长区永兴机械制造厂 | Integral blade mould pressing die |
| JP2004090046A (en) * | 2002-08-30 | 2004-03-25 | Ebara Corp | Precision casting method, its cast product and rotary machine |
Non-Patent Citations (4)
| Title |
|---|
| 1400s18大泵叶轮的铸造工艺 王丕元，兰州工业高等专科学校学报 第9卷第3期 2002 * |
| 1400s18大泵叶轮的铸造工艺 王丕元，兰州工业高等专科学校学报 第9卷第3期 2002;高温合金整体叶轮铸造技术的研究进展 汤鑫等，航空材料学报 第25卷 第3期 2005;真空泵叶轮的铸造 陈耀文，现代铸铁 第4期 2002 * |
| 真空泵叶轮的铸造 陈耀文，现代铸铁 第4期 2002 * |
| 高温合金整体叶轮铸造技术的研究进展 汤鑫等，航空材料学报 第25卷 第3期 2005 * |
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| CN1775420A (en) | 2006-05-24 |
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