CN101837447B - Metal mold gravity casting bottom air-exhaust method - Google Patents
Metal mold gravity casting bottom air-exhaust method Download PDFInfo
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- CN101837447B CN101837447B CN2010101681897A CN201010168189A CN101837447B CN 101837447 B CN101837447 B CN 101837447B CN 2010101681897 A CN2010101681897 A CN 2010101681897A CN 201010168189 A CN201010168189 A CN 201010168189A CN 101837447 B CN101837447 B CN 101837447B
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- push rod
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- 239000002184 metal Substances 0.000 title claims abstract description 53
- 238000005266 casting Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000005484 gravity Effects 0.000 title claims abstract description 25
- 238000000605 extraction Methods 0.000 claims abstract 14
- 238000005086 pumping Methods 0.000 claims abstract 5
- 238000010438 heat treatment Methods 0.000 claims abstract 2
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 238000005058 metal casting Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 20
- 230000000694 effects Effects 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000740 bleeding effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 210000001364 upper extremity Anatomy 0.000 description 1
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Abstract
本发明公开了一种金属型重力铸造底抽气方法，包括如下步骤：(1)将砂芯放置在金属铸型底板上，移动第一推板、第二推板使第一推杆、第二推杆的顶部与底板的上表面平齐，然后向金属铸型的型腔内进行浇铸；(2)浇铸完成后，第一推板固定不动，下拉第二推板使第二推杆下沉露出底板上的抽气通道，将砂芯受热产生的气体通过第二推杆通孔、抽气通道向外排出；(3)铸件凝固完成后，上推第二推板直至第一推杆、第二推杆将铸件顶出金属铸型的型腔。该金属型重力铸造底抽气方法在金属铸型型腔的底板上设置抽气通道，该抽气通道能起到非常好的排气效果，能极大的提高排气能力，使金属型重力铸造的铸件质量得到改善。
The invention discloses a bottom air pumping method for metal mold gravity casting, which comprises the following steps: (1) placing the sand core on the bottom plate of the metal mold, moving the first push plate and the second push plate so that the first push rod, the second push plate The top of the second push rod is flush with the upper surface of the bottom plate, and then poured into the cavity of the metal mold; (2) after the casting is completed, the first push plate is fixed, and the second push plate is pulled down to make the second push rod Sink to expose the air extraction channel on the bottom plate, and discharge the gas generated by the sand core heating through the through hole of the second push rod and the air extraction channel; (3) After the casting is solidified, push up the second push plate until the first push The rod and the second push rod push the casting out of the cavity of the metal mold. In the metal mold gravity casting bottom air extraction method, an air extraction channel is arranged on the bottom plate of the metal mold cavity. Casting quality is improved.
Description
Technical field
The present invention relates to a kind of casting method, particularly a kind of bottom air-exhaust method at metal mold gravity casting.
Background technology
The numerous parts of automobile engine all is to adopt the mode of metal mold gravity casting to produce basically now, especially Guan Jian part such as cylinder cover and cylinder block etc.Because the cavity shape of this class part is very complicated, therefore in the casting process of these parts, needs a lot of cores to combine and form complicated cavity shape.And core can be got angry after being heated in casting process in a large number, causes that foundry goods produces defectives such as pore, seepage.Therefore in order to improve the qualification rate of foundry goods, must take measures getting angry of core discharged the foundry goods die cavity, perhaps adopt the core of low gas forming amount to produce.Adopt the core of low gas forming amount, except increasing cost, also may bring the sand core strength deficiency, cause defectives such as core distortion, therefore less employing, and in the majority in the mode of forced exhaust.The metal mold gravity casting mode that present casting industry generally adopts, owing to be subjected to the restriction of mould structure, forced exhausting structure all is contained in the front and back end mould, and on the slide block of the left and right sides.Such mode has certain effect, but weak point is the situation that does not have core print for left and right sides slide block, and the effect of bleeding will be had a greatly reduced quality.Also have a kind of situation to be in addition, the core of foundry goods allows the place of lifting one's head seldom, so just can not the forced exhaust system be installed on end mould and slide block, therefore can not play the effect of well bleeding.
Summary of the invention
At above-mentioned the deficiencies in the prior art, the technical problem to be solved in the present invention provides a kind of metal mold gravity casting bottom air-exhaust method that can bleed in metal casting bottom plate.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of metal mold gravity casting bottom air-exhaust method, the base plate of used metal mold die cavity is provided with bleed-off passage, the first push rod through hole and the second push rod through hole, the second push rod through hole is communicated with described bleed-off passage, be provided with first push rod in the first push rod through hole, first push rod and base plate are slidingly connected, the lower end of first push rod is connected with first push pedal, be provided with second push rod in the second push rod through hole, second push rod and base plate are slidingly connected, the lower end of second push rod is passed described first push pedal and is connected with second push pedal, second push rod and first push pedal are slidingly connected, and its metal mould cast method comprises the steps:
(1) used core is placed on the base plate of metal mold die cavity, mobile first push pedal, second push pedal make the top of first push rod, second push rod concordant with the upper surface of described base plate, cast in the die cavity of metal mold then;
(2) after casting was finished, first push pedal maintained static, and drop-down described second push pedal makes described second push rod sink to exposing bleed-off passage on the base plate, discharged by the second push rod through hole, bleed-off passage by thermogenetic gas core;
(3) etc. after casting solidification is finished, on push away second push pedal itself and first push pedal fitted, push away second push pedal on continuing then and it driven move the die cavity that foundry goods is ejected metal mold until first push rod, second push rod in first push pedal.
Preferably, described bleed-off passage is connected with an air extractor, and core is outwards extracted out by this air extractor by thermogenetic gas.
Preferably, described bleed-off passage is connected with an air extractor, and core is outwards extracted out by this air extractor by thermogenetic gas.
Preferably, in casting solidification process, air extractor continues outwards to bleed.
Preferably, the position of the described second push rod through hole is corresponding with the position of described core placement.
Preferably, when the top of described first push rod, second push rod was concordant with the upper surface of described base plate, described first push pedal and second push pedal were fitted.
Preferably, described second push pedal is connected with the piston rod of three oil cylinders, the piston rod of described three oil cylinders can move around between low level, centre, high-order three operating positions, when piston rod was positioned at intermediate position, first push pedal and second push pedal are fitted and the top of first push rod, second push rod is concordant with the top of described base plate; When piston rod was positioned at operating position, position, the end, second push rod sank to exposing the bleed-off passage on the base plate; When piston rod was positioned at high-order operating position, first push rod, second push rod ejected foundry goods the die cavity of metal mold.
Preferably, described three oil cylinders comprise a cylinder body, be provided with a fixed piston in the described cylinder body, the below of described fixed piston is provided with first hydraulic fluid port, and the top of described fixed piston is provided with second hydraulic fluid port, and described fixed piston is connected with piston rod, also be provided with a floating piston in the described cylinder body, described floating piston is positioned at described second hydraulic fluid port top, is provided with limited step between described second hydraulic fluid port and the described floating piston, and described floating piston top is provided with the 3rd hydraulic fluid port.
Preferably, the diameter of described floating piston is greater than the diameter of described fixed piston.
Preferably, described fixed piston is connected with described piston rod by the one stroke regulating block, and described stroke adjustment piece is positioned at described limited step below.
Technique scheme has following beneficial effect: this metal mold gravity casting bottom air-exhaust method is provided with bleed-off passage on the base plate of metal mold die cavity, and this bleed-off passage is communicated with the second push rod through hole, in casting solidification process, drop-down second push rod exposes bleed-off passage, core will be discharged by this bleed-off passage by thermogenetic gas like this, this bleed-off passage can play extraordinary exhaust effect, can improve exhaust capacity greatly, the casting quality of metal mold gravity casting is improved.
Description of drawings
Fig. 1 is the connection diagram of metal mold and three oil cylinders in the embodiment of the invention.
The view of metal mold, three oil cylinders when Fig. 2 casts for the embodiment of the invention.
The view of metal mold, three oil cylinders when Fig. 3 bleeds for the embodiment of the invention.
The view of metal mold, three oil cylinders when Fig. 4 ejects for embodiment of the invention foundry goods.
The specific embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described in detail.
As shown in Figure 1, be placed with core 3 on the base plate 2 of metal mold 1 die cavity that this metal mold gravity casting bottom air-exhaust method is used, the base plate 2 of metal mold is provided with bleed-off passage 4, at least one first push rod through hole and at least one second push rod through hole.The number of the first push rod through hole and the second push rod through hole is by the size decision of foundry goods, and the position of the second push rod through hole is corresponding with the putting position of core 3 on base plate 2.Be provided with first push rod, 5, the first push rods 5 in the first push rod through hole and be slidingly connected with base plate 2, the lower end of first push rod 5 is connected with first push pedal 7.The second push rod through hole is communicated with bleed-off passage 4, be provided with second push rod 6 in the second push rod through hole, second push rod 6 is slidingly connected with base plate 2, and the lower end of second push rod 6 is passed first push pedal 7 and is connected with second push pedal 8, between second push rod 6 and first push pedal 7 for being slidingly connected.
The below of metal mold 1 is provided with three oil cylinders, these three oil cylinders comprise cylinder body 11, be provided with a fixed piston 13 in the cylinder body 11, the below of fixed piston 13 is provided with first hydraulic fluid port 12, the top of fixed piston 13 is provided with second hydraulic fluid port 16, and fixed piston 13 is connected with piston rod 15 by one stroke regulating block 14.Also be provided with a floating piston 18 in the cylinder body 11, floating piston 18 is positioned at the top of second hydraulic fluid port 16, be provided with limited step 17 between second hydraulic fluid port 16 and the floating piston 18, limited step 17 is used for floating piston 18 is carried out spacing, slides to the below of second hydraulic fluid port 16 to prevent it.Floating piston 18 tops are provided with the 3rd hydraulic fluid port 19, and the diameter of floating piston 18 is greater than the diameter of fixed piston 13.Piston rod 15 is fixedlyed connected with second push pedal 8, and piston rod 15 can promote second push pedal 8 and move up and down along lead 10.
As shown in Figure 2, this metal mold gravity casting bottom air-exhaust method at first moves to first push pedal 7 position of limiting plate 9 when casting, it is contacted with limiting plate 9, and this moment, the top of first push rod 5 was concordant with the upper surface of base plate 2.Three oil cylinder the 3rd hydraulic fluid ports, 19 oil-feeds then, 12 oil-feeds of first hydraulic fluid port, 16 oil returns of second hydraulic fluid port, floating piston 18 is resisted against on the limited step 17 moving down under the oil pressure thrust, fixed piston 13 moves up under the oil pressure thrust, stroke adjustment piece 14 moves up together with fixed piston 13, drive simultaneously in the piston rod 15 and second push pedal 8 and move, after stroke adjustment piece 14 rises an end stroke, the upper surface of stroke adjustment piece 14 contacts with the lower surface of floating piston 18, because the diameter of floating piston 18 is greater than the diameter of fixed piston 13, therefore the thrust that makes progress is less than downward thrust, fixed piston 13 stops to move up, and this moment, piston rod 15 was positioned at the intermediate position of three oil cylinders.The upward stroke of adjustment stroke regulating block 4, when making piston rod 15 be positioned at three oil cylinder intermediate position, guarantee that second push pedal 8 and first push pedal 7 just fit together, the top of such second push rod 6 is also concordant with the upper surface of base plate 2, second push rod 6 is sealed the connected entrance of the second push rod through hole and bleed-off passage 4, at this moment can cast in the die cavity of metal mold 1.
As shown in Figure 3, after casting is finished, the 3rd hydraulic fluid port 19 first oil-feeds of three oil cylinders, the 16 back oil-feeds of second hydraulic fluid port, 12 oil returns of first hydraulic fluid port, floating piston 18 is being resisted against under the oil pressure thrust on the limited step 17, and fixed piston 13 moves down under the effect of oil pressure pressure, drives piston rod 15 simultaneously and moves down together with second push pedal 8, second push rod 6.When fixed piston 13 moves to extreme lower position, piston rod 15 is positioned at the low level operating position of three oil cylinders, along with moving down of second push rod 6, the second push rod through hole 21 exposes with the connected entrance of bleed-off passage 4, the second push rod through hole 21 is communicated with bleed-off passage 4, the gas of 3 generations of the core in metal mold 1 die cavity will be by the second push rod through hole 21 like this, bleed-off passage 4 discharges, bleed-off passage 4 is circumscribed with a special air extractor and outwards bleeds, make bleed-off passage 4 can play good outside scavenging action, air extractor continues outwards to bleed in the process of setting of whole foundry goods.
Again as shown in Figure 4, after treating that casting solidification finishes, first hydraulic fluid port, 12 oil-feeds of three oil cylinders, 16 oil returns of second hydraulic fluid port, 19 oil returns of the 3rd hydraulic fluid port, fixed piston 13 moves up under the oil pressure thrust, drive stroke adjustment piece 14 simultaneously, piston rod 15, second push pedal 8 moves up together, when piston rod 15 arrives intermediate position, second push pedal 8 and first push pedal 7 fit together, the upper surface of stroke adjustment piece 14 contacts with floating piston 18 lower surfaces at this moment, but because floating piston 18 tops do not have oil pressure thrust, therefore fixed piston 13 can promote stroke adjustment piece 14, second push pedal 8, first push pedal 7, floating piston 18 together moves up, such first push rod 5, second push rod 6 will move up together with corresponding push pedal, and the foundry goods in metal mold 1 die cavity is ejected gradually.When the upper limb of floating piston 18 with cylinder body 11 contacts, this moment, three oil cylinders were positioned at upper operating position, and the foundry goods in metal mold 1 die cavity is ejected die cavity by first push rod 5, second push rod 6, finishes whole casting process.
This metal mold gravity casting bottom air-exhaust method is provided with bleed-off passage on the base plate of metal mold die cavity, and this bleed-off passage is communicated with the second push rod through hole, in casting solidification process, drop-down second push rod exposes bleed-off passage, core will be discharged by this bleed-off passage by thermogenetic gas like this, and this bleed-off passage can play extraordinary exhaust effect.Three oil cylinders can be controlled second push pedal and accurately locate, and second push rod can have been played eject the double action of foundry goods and conducting bleed-off passage, have greatly improved the exhaust capacity of metal mold gravity casting, and the casting quality of metal mold gravity casting is improved.
More than the metal mold gravity casting bottom air-exhaust method that the embodiment of the invention provided is described in detail; for one of ordinary skill in the art; thought according to the embodiment of the invention; part in specific embodiments and applications all can change; in sum; this description should not be construed as limitation of the present invention, and all any changes of making according to design philosophy of the present invention are all within protection scope of the present invention.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101681897A CN101837447B (en) | 2010-05-06 | 2010-05-06 | Metal mold gravity casting bottom air-exhaust method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101681897A CN101837447B (en) | 2010-05-06 | 2010-05-06 | Metal mold gravity casting bottom air-exhaust method |
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| Publication Number | Publication Date |
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| CN101837447A CN101837447A (en) | 2010-09-22 |
| CN101837447B true CN101837447B (en) | 2011-11-30 |
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| CN2010101681897A Expired - Fee Related CN101837447B (en) | 2010-05-06 | 2010-05-06 | Metal mold gravity casting bottom air-exhaust method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9186722B2 (en) * | 2014-02-25 | 2015-11-17 | Morikawa Kanagata Co., Ltd. | Tilt type gravity molding device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2746814B2 (en) * | 1993-04-20 | 1998-05-06 | 光生アルミニューム工業株式会社 | Rotary gravity mold casting machine |
| JP4305843B2 (en) * | 2004-02-13 | 2009-07-29 | 新東工業株式会社 | Gravity tilt casting machine |
| CN2723076Y (en) * | 2004-07-01 | 2005-09-07 | 关建云 | Metal shape casting mold for braking drum |
| JP5040599B2 (en) * | 2007-11-08 | 2012-10-03 | 宇部興産機械株式会社 | Mold for casting aluminum composite part and casting method using the same |
| CN201198028Y (en) * | 2008-06-04 | 2009-02-25 | 上海世保车辆配件有限公司 | Gravity casting apparatus for cylinder head |
| CN201644790U (en) * | 2010-03-19 | 2010-11-24 | 上海皮尔博格有色零部件有限公司 | Metal gravity casting exhaust system |
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Address after: 1288 Xingxian Road, Jiading Industrial Zone, Shanghai, 201800 Patentee after: Huayu Pilberg Nonferrous Components (Shanghai) Co.,Ltd. Address before: 200062 No. 570 Yunling East Road, Putuo District, Shanghai Patentee before: KOLBENSCHMIDT PIERBURG SHANGHAI NONFERROUS COMPONENTS Co.,Ltd. |
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Granted publication date: 20111130 |
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