CN100418671C - Improvement of feeding efficiency by laser heating of metal in riser head - Google Patents
Improvement of feeding efficiency by laser heating of metal in riser head Download PDFInfo
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- CN100418671C CN100418671C CNB2005100312875A CN200510031287A CN100418671C CN 100418671 C CN100418671 C CN 100418671C CN B2005100312875 A CNB2005100312875 A CN B2005100312875A CN 200510031287 A CN200510031287 A CN 200510031287A CN 100418671 C CN100418671 C CN 100418671C
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- rising head
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Abstract
The present invention relates to a method for heating metals in a casting head and improving the feeding efficiency in the process of forming for a cast. In the processes of cooling and coagulating of liquid metals in a mold, the liquid metals in the casting head are used for supplying and filling with gaps which are formed by the reduced volume. The present invention adopts a laser to radiate the metal level in the casting head to heat the metals in the casting head (comprising a casting head neck), the metals maintain liquid, a feeding channel is always fluently in the mold in the process of coagulating of the metals, and the feeding efficiency is improved. The present invention can not cause sand, etc. to enter a mold cavity to cause the casting defect. When the laser with high electro-optical conversion efficiency is used for heating, the cost of the whole technology can not be improved. The present invention also provides the process substance by using the laser to heat the metals in the casting head and a determining method of technological parameters.
Description
Technical field
The present invention relates to the casting technique in a kind of metal material moulding field.Specifically, relate to a kind of method that adds metal in the hot riser, raising feeding efficiency that is used for the foundry goods forming process.
Background technology
In casting process, liquid metal is poured into a mould into after the casting mold, gradually cooling, coagulation forming.In this process, because metal temperature reduces and undergoes phase transition to solid-state from liquid state, metal volume is dwindled.If do not obtain the space that sufficient liquid metal comes filling to stay because of volume contraction in cooling and process of setting, it is loose to produce macrocavity or microcosmic, reduces casting quality greatly, and may cause foundry goods to be scrapped.Therefore, on technology, rising head to be set usually, in liquid metal cooling and process of setting, replenish the volume that dwindles and enter the space that stays with the liquid metal in the rising head.
At rising head and be subjected to keep between the feeding position feeding passage and just can carry out feeding.In the actual casting process, because metal also can equally with the metal that forms foundry goods cool off and solidify in the rising head, the feeding passage cannot not held time longly, so the feeding effect is often undesirable.In order to improve feeding capacity, adopted the method for rising head being carried out heat tracing.At present the method for heat tracing rising head be in rising head, add some with the liquid metal effect after generation heat or reduce the material of thermal loss.Normally in making the casting mold process, emitting shape of the mouth as one speaks wall position to add these heatings or insulation material, the perhaps special-purpose heat preservation rising head of making.
Summary of the invention
Though aforementioned this heat preservation rising head can improve feeding efficiency, but because metal constantly reduces when replenishing casting mold in the rising head, also reduce gradually with the contact-making surface of heat preservation material thereupon, time and degree that the interior metal of rising head is heated insulation are limited, and the effect that therefore improves feeding efficiency is limited.And this heat tracing rising head troublesome poeration is unfavorable for realizing automation, and operation the time causes easily that sand grains etc. enters die cavity, causes defectives such as foundry goods scab.
The present invention proposes a kind of method of new raising riser supplement shrink efficiency, promptly improves feeding efficiency with metal in the LASER HEATING rising head.This method adopts laser irradiation rising head inner metal liquid face, adds the interior metal of hot riser and riser neck and makes it keep liquid state.Because metal is in liquid state all the time in rising head and the riser neck in the metal solidification process in casting mold, the feeding passage is unimpeded always, be subjected to the feeding position in metal cooled and solidified process, can access replenishing of enough liquid metals, can reach desirable feeding effect, eliminate defectives such as shrinkage cavity, shrinkage porosite.In addition, because the effect that the laser irradiation time does not produce mechanical force, can not cause that therefore sand grains etc. enters die cavity and causes casting defect.In laser irradiation process, laser energy is used for compensating the radiation of rising head inner metal surface and conducts dispersed heat by casting mold.Because liquid metal is generally bigger to the absorptivity of laser, if the electric light transformation efficiency of used laser instrument is higher, as CO
2Or semiconductor laser etc., add because of feeding efficiency improves to reduce riser metal volume and foundry goods loss from spoilage that then the cost of whole technology can not improve, even can be lower than the cost of traditional heating insulated feeder.
The present invention proposes the technology main points of metal in the LASER HEATING rising head.Entered by cast in the process of casting mold at liquid metal, when metal in the type reached a certain amount of, liquid metal began to enter rising head (entering the asynchronism(-nization) of top riser and approaching side rising head).The a certain moment after liquid metal begins to be exposed in the air in rising head, laser beam irradiation rising head inner metal liquid face with certain power, suitable spot size, make metal maintenance liquid state in rising head and the riser neck, when (cast finish certain hour after) foundry goods is solidified by the feeding position to be about to finish, stop the laser irradiation.
The present invention has also illustrated the computational methods of the technological parameter of laser irradiation rising head inner metal liquid face.Because laser energy is used for compensating the radiation of rising head inner metal surface and conducts dispersed heat, so required laser power P by casting mold
lJust by liquid metal to the heat P by surface emissivity in the time of metallic flat in the absorptivity α of laser, the rising head
rWith by casting mold conduction dispersed heat P
cDecision, i.e. α P
l=P
r+ P
cAccording to casting process parameters (pouring temperature and speed etc.), casting structure and material thermophysical property and casting mold characteristic etc., calculate casting solidification time, rising head size etc., the decision laser irradiation beginning and ending time; By the spot size of rising head size decision laser beam on metal bath surface, guarantee the energy loss minimum, surface oxidation is also minimum as far as possible.
Description of drawings
Fig. 1 is laser irradiation rising head inner metal liquid face schematic diagram, and running gate system does not draw in the drawings.1 is laser beam among the figure, and 2 is the rising head inner metal liquid, and 3 is casting mold, and 4 is foundry goods die cavity inner metal liquid.
The specific embodiment
Before implementing the present invention, must calculate relevant technological parameter earlier, and result of calculation is set at the technological parameter initial value.At first, according to casting process parameters, casting structure and material thermophysical property and casting mold characteristic etc., calculate casting solidification time, the foundry goods position that needs feeding and the volume of additional metal, the time that the shape size of decision rising head and position and feeding passage are kept; Calculate interior heat P of metallic flat time in the rising head then by surface emissivity
rWith by casting mold conduction dispersed heat P
c, because can clear and definite liquid metal to the absorptivity α of laser, with formula α P
l=P
r+ P
cObtain laser power P
l(actual power also need be by P
lMultiply by an empirical coefficient relevant with the degree of superheat and irradiation time), the time of keeping according to feeding passage needs is determined the time of laser irradiation.
Specific implementation process: 1) be ready to LASER Light Source, checkout gear etc., behind laser head, liquid level sensor aligning rising head, beginning pouring liquid metal; 2) after the metal bath surface checkout gear detects interior liquid level of rising head and temperature thereof, signal is transferred to computer, computer begins irradiation time according to the laser of the former setting of liquid level temperature correction; 3) computer begins irradiation time according to revised laser and sends and begin irradiation instruction, and laser begins to shine metal bath surface; 4) after cast finished, computer finished irradiation time according to the laser of the former setting of real-time detected temperature correction; 5) computer stops irradiation time according to revised laser and sends and stop irradiation instruction, and laser stops to shine metal bath surface.
Claims (3)
1. method that in the foundry goods forming process, improves riser supplement shrink efficiency, promptly, it is characterized in that: adopt laser irradiation rising head inner metal liquid face, add metal in hot riser and the riser neck with metal, raising feeding efficiency in the LASER HEATING rising head, keep its liquid state, keep the feeding passage.
2. the method for raising riser supplement shrink efficiency according to claim 1, its feature also is: after liquid metal is exposed in the air in rising head, laser beam begins to shine rising head inner metal liquid face, and cast finishes the back, foundry goods is solidified when finishing by the feeding position, and laser beam stops irradiation.
3. the method for raising riser supplement shrink efficiency according to claim 1, its feature also is: laser power P
lBy liquid metal to the heat P by surface emissivity in the time of metallic flat in the absorptivity α of laser, the rising head
rWith by casting mold conduction dispersed heat P
cDecision, i.e. α P
l=P
r+ P
c
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100312875A CN100418671C (en) | 2005-02-28 | 2005-02-28 | Improvement of feeding efficiency by laser heating of metal in riser head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100312875A CN100418671C (en) | 2005-02-28 | 2005-02-28 | Improvement of feeding efficiency by laser heating of metal in riser head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1827257A CN1827257A (en) | 2006-09-06 |
| CN100418671C true CN100418671C (en) | 2008-09-17 |
Family
ID=36945927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100312875A Expired - Fee Related CN100418671C (en) | 2005-02-28 | 2005-02-28 | Improvement of feeding efficiency by laser heating of metal in riser head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100418671C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101905287A (en) * | 2010-08-18 | 2010-12-08 | 中核苏阀横店机械有限公司 | Open riser |
| CN110170637B (en) * | 2019-05-28 | 2021-05-25 | 深圳市万泽中南研究院有限公司 | Equipment and process for maintaining stability of casting in directional solidification process |
| CN112517889B (en) * | 2020-10-30 | 2021-12-24 | 中国航发北京航空材料研究院 | A system and method for dynamic heating of riser in titanium alloy casing casting process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1280893A (en) * | 2000-08-07 | 2001-01-24 | 史保萱 | Casting technology by squeezing riser head for compensating shrink |
| CN2452648Y (en) * | 2000-11-02 | 2001-10-10 | 沈兴关 | Temp. keeping riser |
-
2005
- 2005-02-28 CN CNB2005100312875A patent/CN100418671C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1280893A (en) * | 2000-08-07 | 2001-01-24 | 史保萱 | Casting technology by squeezing riser head for compensating shrink |
| CN2452648Y (en) * | 2000-11-02 | 2001-10-10 | 沈兴关 | Temp. keeping riser |
Non-Patent Citations (8)
| Title |
|---|
| 冒口及冒口设计. 牛金霞.青海大学学报，第21卷第6期. 2003 |
| 冒口及冒口设计. 牛金霞.青海大学学报，第21卷第6期. 2003 * |
| 激光表面强化技术. 曲敬信等.水利电力机械，第25卷第2期. 2003 |
| 激光表面强化技术. 曲敬信等.水利电力机械，第25卷第2期. 2003 * |
| 激光表面改性技术及国内外发展现状. 应小东等.焊接，第1期. 2003 |
| 激光表面改性技术及国内外发展现状. 应小东等.焊接，第1期. 2003 * |
| 金属表面激光处理技术及其工业应用. 姚建华等.电力机车技术，第25卷第5期. 2002 |
| 金属表面激光处理技术及其工业应用. 姚建华等.电力机车技术，第25卷第5期. 2002 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1827257A (en) | 2006-09-06 |
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Owner name: CHANGSHA JIACHENG MACHINERY MANUFACTURING CO., LTD Free format text: FORMER OWNER: LIU JICHANG Effective date: 20110901 |
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Free format text: CORRECT: ADDRESS; FROM: 410082 CHANGSHA, HUNAN PROVINCE TO: 410208 CHANGSHA, HUNAN PROVINCE |
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Effective date of registration: 20110901 Address after: 410208, Hunan City, Changsha Province town, Changsha Yuelu science and Technology Industrial Park Administrative Committee comprehensive service building Patentee after: CHANGSHA JIA-CHENG MACHINERY MANUFACTURING CO., LTD. Address before: 410082 School of mechanical and automotive engineering, Hunan University, Changsha, Hunan, Patentee before: Liu Jichang |
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Granted publication date: 20080917 Termination date: 20130228 |