CN104338921A - Inner venting structure of pressure casting die of front bearing cap of ultra-low speed pressure casting cam shaft - Google Patents
Inner venting structure of pressure casting die of front bearing cap of ultra-low speed pressure casting cam shaft Download PDFInfo
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- CN104338921A CN104338921A CN201410660317.8A CN201410660317A CN104338921A CN 104338921 A CN104338921 A CN 104338921A CN 201410660317 A CN201410660317 A CN 201410660317A CN 104338921 A CN104338921 A CN 104338921A
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- pressure casting
- die
- die casting
- low speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
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- Mechanical Engineering (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention discloses an inner venting structure of a pressure casting die of a front bearing cap of an ultra-low speed pressure casting cam shaft. The pressure casting die is provided with an air trapping area, wherein the inner surface of the air trapping area is provided with a 8-shaped insert; the top of the 8-shaped insert is connected with a die top block; an air overflowing gap is formed between the bottom of the 8-shaped insert and the surface of an adjacent die and is communicated with an outer exhaust passage of the die. According to the inner venting structure of the pressure casting die of the front bearing cap of the ultra-low speed pressure casting cam shaft, the practical flow direction of molten aluminum in a die cavity and influence on a product by temperature change and air discharge during production are considered, the structural design of the die is improved, a pit mold cavity part is subjected to local transformation, a trap phenomenon in low-speed pressure casting is thoroughly eliminated, the local quality of the product is improved, and a rejection rate is lowered.
Description
Technical field
The present invention relates to the exhaust structure of Ultra-Low Speed die casting, particularly relate to the exhaust structure in a kind of die casting of Ultra-Low Speed die casting front bearing cover of cam shaft.
Background technology
The die casting of super thick aluminium alloy, shrinkage cavity and pore are difficult problems of puzzlement industry always.The mode of the low speed die casting adopted decreases the turbulent flow in press casting procedure, reduce the probability of aluminium alloy solution parcel gas, extend the cooling procedure in evacuation time and flowing, the Shrinkage Problem of super thick die casting can be solved, but because the flow rate of aluminium liquid of low speed die casting is lower than high speed die casting, aluminium liquid is too gentle for the impact of mold cavity surface in flowing, therefore dead angle part can accumulate some gases, emphasis shows the dark pit of global formation, so the surface of die casting just creates a new defect type---air bound (the aluminium liquid caused due to gas barrier is separated), or according to the surface crater that gas shape is formed.This part gas is generally open on product, seldom appears in interiors of products, but can form obvious separator bar on product time serious, and the words extending to interiors of products also can reduce the intensity of product.
The generally little appearance of surperficial air bound in die casting, during HTHP, surface gas is normally washed to be broken up and is rolled onto interiors of products, forms pore in inside.The aluminium liquid of low speed die casting is due to the resistance of gas in pit die cavity, and impulsive force own is too low, and therefore this air bound is the endemism in low speed die casting.Existing technology mainly contains following two kinds: one, on die joint, offer air discharge duct, but because most product thickness is larger, when extrusion process adopts Ultra-Low Speed, the gas in complex-shaped surface mould still cannot be got rid of very well, outward appearance and internal flaw is more, qualification rate is low when causing product to be cast.Two, common insert exhaust, such exhaust structure shape is single, with the exhaust position matching needing ad-hoc location, well to get rid of the gas of specified point, cannot cause air bound defect.
In sum, in the urgent need to the exhaust structure in a kind of die casting of Ultra-Low Speed die casting front bearing cover of cam shaft in practical operation, local flow improvement is carried out to the part of pit die cavity, thoroughly solve the air bound phenomenon in low speed die casting, improve product local quality, reduce scrappage.
Summary of the invention
For solving the problems of the technologies described above, the object of this invention is to provide a kind of for exhaust structure in the die casting of the tired gas zone design on front bearing cover of cam shaft, design " 8 " word exhaust structure of inner surface targetedly, air bound phenomenon in the die casting of thorough solution low speed, local structural modification is carried out to pit type cavity segment, mode is flexible, can carry out normalization production and application.
For achieving the above object, technical scheme provided by the present invention is:
Exhaust structure in a kind of die casting of Ultra-Low Speed die casting front bearing cover of cam shaft, described die casting has tired gas region, at the inner surface in described tired gas region, 8 font inserts are set, the top of described 8 font inserts is connected with 8 character mould jacking blocks, bottom described 8 font inserts and formed between adjacent molds surface overflow air flue gap, described excessive air flue gap is connected with the outer exhaust duct of mould.
Further, described excessive air flue gap is 0.04-0.07mm.
Further, described excessive air flue gap is 0.06mm.
Further, the flow rate of aluminium liquid of point cast gate is greater than by the gas flow rate of the outer exhaust duct of described 8 font inserts.
Adopt technique scheme, beneficial effect of the present invention has:
1. repetition test of the present invention measures the blocking critical point of aluminium liquid exhaust duct, and utilize insert products mould structure part, open passage is formed with the external world, to discharge the gas of die cavity concave regions, reduce internal gas to the resistance of aluminium liquid filling die cavity, to mould structure transformation, to make up because of product structure to the congenital defect that extrusion process is brought, improve the quality of products and intensity.
2. because the product structure of front bearing cover of cam shaft is complicated, spill die cavity is more common, and the optimization of this mould structure can improve technology difficulty, improves product percent of pass and reduces production cost.
3. the exhaust structure in the die casting of Ultra-Low Speed die casting front bearing cover of cam shaft of the present invention, by considering the flow direction of actual aluminium liquid in die cavity in practice, and produce time variations in temperature and gas discharging on the impact of product, the structural design of mould is improved, local flow improvement is carried out to the part of pit die cavity, air bound phenomenon in the die casting of thorough solution low speed, improves product local quality, reduces scrappage.
Accompanying drawing explanation
Fig. 1 is the schematic diagram in tired gas region in one embodiment of the present of invention;
Fig. 2 is the schematic diagram in tired gas region in an alternative embodiment of the invention;
Fig. 3 is the schematic diagram of air bound defect area in one embodiment of the present of invention;
Fig. 4 increases " 8 " word at defective locations in one embodiment of the present of invention to overflow the schematic diagram of depressed structure;
Fig. 5 is that in one embodiment of the present of invention, " 8 " word overflows the schematic diagram of depressed structure.
Description of reference numerals
1 mold jacking block, 2 " 8 " font inserts, 3 excessive air flue gaps, 4 outer exhaust ducts, 5 fixed point exhausts
Detailed description of the invention
As shown in Figure 1, 2, in the die casting of Ultra-Low Speed die casting front bearing cover of cam shaft, the region that in figure, circle is irised out is the pit type cavity configuration of mould, herein because the flow rate of aluminium liquid of low speed die casting is lower than high speed die casting, aluminium liquid is too gentle for the impact of mold cavity surface in flowing, dead angle part can accumulate some gases, and the flowing due to aluminium liquid can make die casting form air bound, and such region is called tired gas region.Figure 3 shows that the aluminium liquid caused by gas barrier is separated the air bound defect caused.
As shown in Figure 4,5, because the aluminium water capacity easily creeps into exhaust way blocking exhaust duct, therefore mold cavity is arranged the difficult point that exhaust is Die Casting Industry always, the present invention, through repeatedly testing, measures the blocking critical point of aluminium liquid exhaust duct.As shown in Figure 4, increase " 8 " word at defective locations to overflow depressed structure.Inner surface in tired gas region arranges " 8 " font insert 2, and the top of " 8 " font insert 2 is connected with " 8 " character mould jacking block 1, and the connected mode of insert can be bolted, hanging platform pressing plate, close-fitting are inlayed, and this is not restricted.Bottom described 8 font inserts and formed between adjacent molds surface overflow air flue gap 3, described excessive air flue gap is connected with the outer exhaust duct 4 of mould, realize mold jacking block fixed point be vented 5.Excessive air flue gap is set to 0.04-0.07mm, and in the present embodiment, this excessive air flue gap is 0.06mm.
Like this, utilize and " 8 " font insert 2 should form open channel with extraneous, the gas in tired gas region can be discharged by air flue gap 3 of overflowing, and aluminium liquid can not be discharged.Again because this excessive air flue gap is connected with the outer exhaust duct 4 of mould, effectively gas can be discharged to outside.
Utilize the die casting step of the die casting of Ultra-Low Speed die casting front bearing cover of cam shaft of the present invention as follows:
(1) prepare burden: the percentage by weight of aluminum alloy materials component is: the silicon of 8%; The magnesium of 0.05%; The iron of 1.3%; The copper of 2.0%; The manganese of 0.55%; The nickel of 0.55%; The zinc of 1.2%; The lead of 0.35%; The tin of 0.25%; The titanium of 0.25%; The chromium of 0.15%, surplus is aluminium.
(2) melting: mould local cooling when melting starts, smelting temperature is set as 710 DEG C, adds the refining deterioration agent of 0.2%, adds with during getter degasification; Water cooling when mould local cooling uses, hydraulic pressure control is at 4Mpa, and die temperance control is at 140 DEG C, and hole temperature of loosing core controls at 260 DEG C.
(3) degasification adopt purity be 99.99% argon gas carry out degas operation 3 minutes, qualified latter static 8 minutes prepare die casting;
(4) die cast: main running channel flow rate of aluminium liquid=2 meter per second; Divide cast gate flow rate of aluminium liquid=5 meter per second; " 8 " word insert exhaust duct gas flow rate > 5 meter per second, aging temp is 225 DEG C, is incubated 10 hours.
The above embodiment only have expressed embodiments of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (4)
1. the exhaust structure in the die casting of a Ultra-Low Speed die casting front bearing cover of cam shaft, described die casting has tired gas region, it is characterized in that, at the inner surface in described tired gas region, 8 font inserts are set, the top of described 8 font inserts is connected with 8 character mould jacking blocks, bottom described 8 font inserts and formed between adjacent molds surface overflow air flue gap, described excessive air flue gap is connected with the outer exhaust duct of mould.
2. the exhaust structure in die casting according to claim 1, is characterized in that, described excessive air flue gap is 0.04-0.07mm.
3. the exhaust structure in die casting according to claim 2, is characterized in that, described excessive air flue gap is 0.06mm.
4. the exhaust structure in die casting according to claim 1, is characterized in that, is greater than the flow rate of aluminium liquid of point cast gate by the gas flow rate of the outer exhaust duct of described 8 font inserts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410660317.8A CN104338921B (en) | 2014-11-18 | 2014-11-18 | Exhaust structure in the die casting of a kind of Ultra-Low Speed die casting front bearing cover of cam shaft |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410660317.8A CN104338921B (en) | 2014-11-18 | 2014-11-18 | Exhaust structure in the die casting of a kind of Ultra-Low Speed die casting front bearing cover of cam shaft |
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| Publication Number | Publication Date |
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| CN104338921A true CN104338921A (en) | 2015-02-11 |
| CN104338921B CN104338921B (en) | 2016-08-31 |
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| CN201410660317.8A Active CN104338921B (en) | 2014-11-18 | 2014-11-18 | Exhaust structure in the die casting of a kind of Ultra-Low Speed die casting front bearing cover of cam shaft |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109396389A (en) * | 2018-12-30 | 2019-03-01 | 博众优浦(常熟)汽车部件科技有限公司 | A kind of bilateral charging casting die for camshaft the cover |
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| CN201179557Y (en) * | 2008-04-16 | 2009-01-14 | 广州市型腔模具制造有限公司 | Air discharge mechanism of mould |
| KR20090058838A (en) * | 2007-12-05 | 2009-06-10 | 현대자동차주식회사 | Oil jacket core of cylinder head mold for lower casting |
| CN101791685A (en) * | 2009-12-23 | 2010-08-04 | 常州市蓝托金属制品有限公司 | Die casting mould special for ultrathin-wall non-leakage aviation aluminium alloy element |
| CN202224629U (en) * | 2011-08-17 | 2012-05-23 | 华孚精密金属科技(常熟)有限公司 | Sliding block structure for pressure casting die |
| CN203764930U (en) * | 2013-12-10 | 2014-08-13 | 福州冠锋模具技术有限公司 | Annular overflow drainage system of die-casting mould |
| CN204220963U (en) * | 2014-11-18 | 2015-03-25 | 太仓海嘉车辆配件有限公司 | Exhaust structure in a kind of die casting of Ultra-Low Speed die casting front bearing cover of cam shaft |
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2014
- 2014-11-18 CN CN201410660317.8A patent/CN104338921B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101209490A (en) * | 2006-12-29 | 2008-07-02 | 富准精密工业(深圳)有限公司 | Die casting die for shaping cooling component and method for manufacturing cooling component by the same |
| KR20090058838A (en) * | 2007-12-05 | 2009-06-10 | 현대자동차주식회사 | Oil jacket core of cylinder head mold for lower casting |
| CN201179557Y (en) * | 2008-04-16 | 2009-01-14 | 广州市型腔模具制造有限公司 | Air discharge mechanism of mould |
| CN101791685A (en) * | 2009-12-23 | 2010-08-04 | 常州市蓝托金属制品有限公司 | Die casting mould special for ultrathin-wall non-leakage aviation aluminium alloy element |
| CN202224629U (en) * | 2011-08-17 | 2012-05-23 | 华孚精密金属科技(常熟)有限公司 | Sliding block structure for pressure casting die |
| CN203764930U (en) * | 2013-12-10 | 2014-08-13 | 福州冠锋模具技术有限公司 | Annular overflow drainage system of die-casting mould |
| CN204220963U (en) * | 2014-11-18 | 2015-03-25 | 太仓海嘉车辆配件有限公司 | Exhaust structure in a kind of die casting of Ultra-Low Speed die casting front bearing cover of cam shaft |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109396389A (en) * | 2018-12-30 | 2019-03-01 | 博众优浦(常熟)汽车部件科技有限公司 | A kind of bilateral charging casting die for camshaft the cover |
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| CN104338921B (en) | 2016-08-31 |
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Effective date of registration: 20160718 Address after: Liuhe Xinzha village in Taicang city Suzhou city Jiangsu province 215431 Applicant after: Suzhou Meikekasi Automobile Technology Co., Ltd. Address before: 215431 Jiangsu city of Suzhou province Taicang City Liuhe Town, Zhujianglu Road No. 55 Applicant before: Taicang Haijia Vehicle Fittings Co., Ltd. |
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