CN102205394A - Hot investment casting method for electric heating element - Google Patents
Hot investment casting method for electric heating element Download PDFInfo
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- CN102205394A CN102205394A CN201110107977XA CN201110107977A CN102205394A CN 102205394 A CN102205394 A CN 102205394A CN 201110107977X A CN201110107977X A CN 201110107977XA CN 201110107977 A CN201110107977 A CN 201110107977A CN 102205394 A CN102205394 A CN 102205394A
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Abstract
The invention discloses a hot investment casting method for an electric heating element, which comprises the steps of: installing and welding a wax mould, making a sodium silicate mould housing, dewaxing, roasting and pouring. The hot investment casting method is characterized in that a multi-point narrow-gap flow gate is arranged on a position being 1/3 away from the downside of the electric heating element , an exhaust channel is arranged on the top of the electric heating element, a convex shoulder is arranged on the exhaust channel, a reinforced rib is arranged at the upper part of the electric heating element, a coating at the top of the convex shoulder is removed during housing making to form the opened exhaust channel, and the mould housing is dewaxed and roasted; and the temperature of the mould housing during pouring is ensured to be about 500 DEG C, and the pouring temperature of molten steel is ensured to be about 1430-1450 DEG C.
Description
Technical field
The present invention relates to a kind of electrical heating elements investment casting method, relate in particular to a kind of casting method with the narrow gap of multiple spot ingate, convex shoulder.
Background technology
Electrical heating elements was foreign-made in the past always, and its manufacturing technology is overseas enterprise's monopolization.In order to realize production domesticization, exploring feasible effective method in the industry always, but poor effect.For example Chinese patent CN1173406A discloses a kind of easy casing tech by lost wax casting, according to soaking (brush or spray) alcohol-base paint on foundry goods wax-pattern (or module) surface 2-3 time, dries up with cold wind at every turn, self-hardening sand molding is filled at the back, after the sclerosis, steep water glass 1-3 minute takes out the sclerosis of drying in the shade, then hot blast dewaxing, at 500-650 ℃ of roasting temperature 1 hour, pattern of fever, the imitative gold copper of cast, remove formwork after the cooling, obtain investment-casting.For example Chinese patent CN101537478A discloses a kind of die-casting die casting system for magnesium alloy automobile engine cylinder head casing again, is provided with a plurality of narrow gaps ingate in the bottom of running gate system.
But, domestic when doing the electrical heating elements product, ingate or ingate generally are not set are arranged on bottom or middle part or top.Ingate is arranged on the bottom and causes the bottom heat to concentrate easily, cracks; Ingate is arranged on the middle part bad formation pore of exhaust easily; Ingate is arranged on the top and is easy to generate bottom misrun, dreg defect.
In addition, the domestic general negligible amounts of ingate when doing similar electrical heating elements product, I haven't seen you for ages causes heat to be concentrated cracking, cause local misrun phenomenon in addition easily for quantity.And the domestic general broad of ingate when doing similar products, this can cause producing shrinkage porosite and crack defect.
Moreover domestic do not have the overflow convex shoulder when doing similar electrical heating elements product, and this can cause the top to produce the misrun defective.
Owing to above reason causes the disposable qualification rate of domestic similar electrical heating elements product very low, be generally about 40～60%.Some producer even all solve by reparation.Therefore demand developing electrical heating elements precision casting technology method urgently, to have solved the difficult problem of electrical heating elements production domesticization.
Summary of the invention
Technical problem to be solved by this invention be electrical heating elements since wall thickness approach yielding in casting process, and easily form defectives such as pore, slag inclusion, misrun.The problems referred to above all can cause the resistivity of electrical heating elements ANOMALOUS VARIATIONS to occur.
For overcoming these technical barriers, the present invention by the following technical solutions:
The invention provides a kind of electrical heating elements investment casting method, at first the assembly welding wax-pattern comprises cup, sprue, cross gate, ingate and the electrical heating elements that connects successively, the exhaust passage is connected with cup by the exhaust rod, secondly undertaken by the operation of making sodium silicate shell, dewaxing, roasting, cast, it is characterized in that, 1/3 place is provided with the narrow gap of multiple spot ingate under electrical heating elements, it is steady to make molten steel fill type, be beneficial to gas and floating foreign and discharge, can also avoid crackle, shrinkage defect occurring near the ingate; And the exhaust passage is set at the electrical heating elements top, convex shoulder is set on the exhaust passage.
Further, the thickness of the narrow gap of described multiple spot ingate is about 0.7～1.2 times of electrical heating elements wall thickness, and quantity is determined according to the length of electrical heating elements.
Further, the height of described convex shoulder is 10～30mm, during the system shell convex shoulder top coating is successively struck off, and forms open exhaustion spill passage, avoids producing pore and top misrun defective.
Further, can be provided for avoiding the reinforcement of electrical heating elements distortion on heating element heater top.
Further, mould shell temperature is 400 ℃～800 ℃ when cast, by improving the come-up that the shell temperature can be beneficial to bits.
Further, the pouring molten steel temperature is 1430 ℃～1450 ℃, controls lower pouring temperature and can avoid crackle occurring near the ingate.
The present invention has successfully solved the casting difficult problem of electrical heating elements by such scheme, and first-time qualification rate can reach 98%, and the minute quantity problem can solve by repairing.Greatly reduce manufacturing cost, successfully realized production domesticization, saved the purchase cost of domestic steel mill.
Description of drawings
Fig. 1 is the electrical heating elements schematic diagram;
Figure 1A is the A-A sectional view of Fig. 1;
Fig. 2 is a casting process scheme schematic diagram of the present invention;
Fig. 2 A is the side view of Fig. 2;
Fig. 3 is the narrow gap of a multipoint mode of the present invention ingate schematic diagram.
Description of reference numerals: 1-cup; 2-exhaust rod; The 3-exhaust passage; The 4-convex shoulder; The 5-reinforcement; The 6-sprue; The 7-cross gate; The 8-ingate; The 9-electrical heating elements.
The specific embodiment
Below in conjunction with accompanying drawing, be described in more detail with other technical characterictic and advantage the present invention is above-mentioned.
The electrical heating elements investment casting method, generally be to carry out according to the operation of assembly welding wax-pattern, making sodium silicate shell, dewaxing, roasting and cast, the assembly welding wax-pattern comprises successively the cup 1 that connects, sprue 6, cross gate 7, ingate 8 to electrical heating elements 9, and exhaust passage 3 is connected with cup 1 by exhaust excellent 2.The present invention in order to solve electrical heating elements since wall thickness approach yielding in casting process, and easily form the problem of defectives such as pore, slag inclusion, misrun, a kind of electrical heating elements investment casting method is provided.
The first step is by assembly welding wax-pattern shown in Figure 1, wherein electrical heating elements 9 wall thickness 4mm.As shown in Figure 2, at following 1/3 place of electrical heating elements 9 the narrow gap of multiple spot ingate 8 is set, the thickness of ingate 8 is 3mm, quantity is according to the length setting of electrical heating elements 9, it is steady to make molten steel fill type, be beneficial to gas and floating foreign and discharge, can also avoid ingate 8 near crackle, shrinkage defect appear.Exhaust passage 3 is set at electrical heating elements 9 tops, and (its cross section is 15 * 10mm), and 3 tops are provided with convex shoulder 4 in the exhaust passage, and the height of convex shoulder 4 is that (its cross section is 30 * 10mm) to 10～30mm.
Second step was made sodium silicate shell, and surface layer adopts zircon flour coating, during the system shell convex shoulder 4 Topcoatings was struck off, and formed open exhaustion spill passage, avoided producing pore and top misrun defective.
The dewaxing of the 3rd step, the control water temperature is 98 ℃.
The 4th one-step baking, temperature are 840 ℃～870 ℃, are incubated about 1h.
The cast of the 5th step, the shell temperature is 400 ℃～800 ℃ during cast, and preferred about 500 ℃, by improving the come-up that the shell temperature can be beneficial to bits.About 1430 ℃～1450 ℃ of pouring molten steel temperature, material is Ni70Cr30, controls lower pouring temperature and can avoid crackle occurring near the ingate.Molten steel flow to electrical heating elements 9 through cup 1, sprue 6, cross gate 7, ingate 8 successively, after 3 arrive convex shoulders 4 through the exhaust passage again.Molten steel waters to convex shoulder 4 can see that molten steel gets final product.
Further, described method can be provided with reinforcement 5 on electrical heating elements 9 tops, and reinforcement 5 thickness are 3mm, have avoided the distortion of electrical heating elements.
Further, the narrow gap of multipoint mode as shown in Figure 3 ingate 8, the thickness t 2 of the general narrow gap of multiple spot ingate 8 is about 0.7～1.2 times of electrical heating elements 9 wall thickness t1, the thickness t 3 of cross gate 7 and ingate 8 junctions is about 2～4 times of electrical heating elements 9 wall thickness t1, i.e. t1: t2: t3=1: (0.7～1.2): (2～4).
The present invention is not only applicable to electrical heating elements, belongs to protection scope of the present invention for the narrow ingate of the small-sized foundry goods band of other thin-walleds multipoint mode, shouldered casting method yet.
The above only is preferred embodiment of the present invention, only is illustrative for the purpose of the present invention, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes to it in the spirit and scope that claim of the present invention limited, revise, even equivalence, but all will fall within the scope of protection of the present invention.
Claims (6)
1. electrical heating elements investment casting method, at first the assembly welding wax-pattern comprises cup, sprue, cross gate, ingate and the electrical heating elements that connects successively, the exhaust passage is connected with cup by the exhaust rod, secondly undertaken by the operation of making sodium silicate shell, dewaxing, roasting, cast, it is characterized in that, 1/3 place is provided with the narrow gap of multiple spot ingate under electrical heating elements, and at the electrical heating elements top exhaust passage is set, and convex shoulder is set on the exhaust passage.
2. the investment casting method of electrical heating elements according to claim 1 is characterized in that, the thickness of the narrow gap of described multiple spot ingate is 0.7～1.2 times of electrical heating elements wall thickness.
3. the investment casting method of electrical heating elements according to claim 1, it is characterized in that: the height of described convex shoulder is 10～30mm, convex shoulder top coating successively strikes off during the system shell, forms open exhaustion spill groove.
4. the investment casting method of electrical heating elements according to claim 1 is characterized in that: the reinforcement that is provided for avoiding the electrical heating elements distortion on electrical heating elements top.
5. the investment casting method of electrical heating elements according to claim 1 is characterized in that: mould shell temperature is 400 ℃～800 ℃ when cast.
6. the investment casting method of electrical heating elements according to claim 1, it is characterized in that: the pouring molten steel temperature is 1430 ℃～1450 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110107977XA CN102205394A (en) | 2011-04-28 | 2011-04-28 | Hot investment casting method for electric heating element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110107977XA CN102205394A (en) | 2011-04-28 | 2011-04-28 | Hot investment casting method for electric heating element |
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| CN102205394A true CN102205394A (en) | 2011-10-05 |
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| CN201110107977XA Pending CN102205394A (en) | 2011-04-28 | 2011-04-28 | Hot investment casting method for electric heating element |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103586415A (en) * | 2013-11-07 | 2014-02-19 | 中国南方航空工业(集团)有限公司 | Pouring system |
| CN103600034A (en) * | 2013-11-25 | 2014-02-26 | 沈阳黎明航空发动机(集团)有限责任公司 | Runner system melting mould for casting thin-wall castings |
| CN106955972A (en) * | 2017-05-17 | 2017-07-18 | 东风精密铸造安徽有限公司 | A kind of investment-casting layer-stepping is vented casting technique |
| CN109609811A (en) * | 2019-02-22 | 2019-04-12 | 上海中洲特种合金材料股份有限公司 | A kind of preparation method of cobalt-base alloys casting |
| CN115319026A (en) * | 2022-07-29 | 2022-11-11 | 中国航发沈阳发动机研究所 | Exhaust and mold filling method for aluminum alloy investment antigravity casting shell |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1173406A (en) * | 1997-06-30 | 1998-02-18 | 浙江大学 | Simple casing tech by lost wax casting |
| JP2000158116A (en) * | 1998-11-30 | 2000-06-13 | Toshiba Mach Co Ltd | Casting die |
| CN101406933A (en) * | 2008-11-27 | 2009-04-15 | 山东泰山钢铁集团有限公司 | Wax liquor discharging technique for dewaxing of precision casting shell |
| CN101537478A (en) * | 2009-04-24 | 2009-09-23 | 华南理工大学 | Die-casting die casting system for magnesium alloy automobile engine cylinder head casing |
| CN101862811A (en) * | 2010-02-09 | 2010-10-20 | 徐州胜海机械制造科技有限公司 | Rapid investment casting method of complex thin-wall component |
-
2011
- 2011-04-28 CN CN201110107977XA patent/CN102205394A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1173406A (en) * | 1997-06-30 | 1998-02-18 | 浙江大学 | Simple casing tech by lost wax casting |
| JP2000158116A (en) * | 1998-11-30 | 2000-06-13 | Toshiba Mach Co Ltd | Casting die |
| CN101406933A (en) * | 2008-11-27 | 2009-04-15 | 山东泰山钢铁集团有限公司 | Wax liquor discharging technique for dewaxing of precision casting shell |
| CN101537478A (en) * | 2009-04-24 | 2009-09-23 | 华南理工大学 | Die-casting die casting system for magnesium alloy automobile engine cylinder head casing |
| CN101862811A (en) * | 2010-02-09 | 2010-10-20 | 徐州胜海机械制造科技有限公司 | Rapid investment casting method of complex thin-wall component |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103586415A (en) * | 2013-11-07 | 2014-02-19 | 中国南方航空工业(集团)有限公司 | Pouring system |
| CN103600034A (en) * | 2013-11-25 | 2014-02-26 | 沈阳黎明航空发动机(集团)有限责任公司 | Runner system melting mould for casting thin-wall castings |
| CN103600034B (en) * | 2013-11-25 | 2015-08-26 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of casting thin foundry goods runner system fusible pattern |
| CN106955972A (en) * | 2017-05-17 | 2017-07-18 | 东风精密铸造安徽有限公司 | A kind of investment-casting layer-stepping is vented casting technique |
| CN109609811A (en) * | 2019-02-22 | 2019-04-12 | 上海中洲特种合金材料股份有限公司 | A kind of preparation method of cobalt-base alloys casting |
| CN109609811B (en) * | 2019-02-22 | 2021-08-06 | 上海中洲特种合金材料股份有限公司 | Preparation method of cobalt-based alloy casting |
| CN115319026A (en) * | 2022-07-29 | 2022-11-11 | 中国航发沈阳发动机研究所 | Exhaust and mold filling method for aluminum alloy investment antigravity casting shell |
| CN115319026B (en) * | 2022-07-29 | 2024-01-02 | 中国航发沈阳发动机研究所 | Exhaust molding method for aluminum alloy investment pattern antigravity casting shell |
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Application publication date: 20111005 |