CN204220963U - Exhaust structure in a kind of die casting of Ultra-Low Speed die casting front bearing cover of cam shaft - Google Patents
Exhaust structure in a kind of die casting of Ultra-Low Speed die casting front bearing cover of cam shaft Download PDFInfo
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- CN204220963U CN204220963U CN201420694178.6U CN201420694178U CN204220963U CN 204220963 U CN204220963 U CN 204220963U CN 201420694178 U CN201420694178 U CN 201420694178U CN 204220963 U CN204220963 U CN 204220963U
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- die casting
- low speed
- exhaust structure
- ultra
- cam shaft
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- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
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, 8 font inserts are provided with at the inner surface in described tired gas region, 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.Exhaust structure in the die casting of Ultra-Low Speed die casting front bearing cover of cam shaft of the present utility model, 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.
Description
Technical field
The utility model relates to the exhaust structure of Ultra-Low Speed die casting, particularly relates 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.
Utility model content
For solving the problems of the technologies described above, the purpose of this utility model 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 realizing above-mentioned utility model object, technical scheme provided by the utility model 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, the beneficial effects of the utility model have:
1. the utility model repetition test 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 utility model, 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 an embodiment of the present utility model;
Fig. 2 is the schematic diagram in tired gas region in another embodiment of the present utility model;
Fig. 3 is the schematic diagram of air bound defect area in an embodiment of the present utility model;
Fig. 4 increases " 8 " word at defective locations in an embodiment of the present utility model to overflow the schematic diagram of depressed structure;
Fig. 5 is that in an embodiment of the present utility model, " 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 utility model, 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 utility model 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 embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.
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 |
|---|---|---|---|
| CN201420694178.6U CN204220963U (en) | 2014-11-18 | 2014-11-18 | Exhaust structure in a kind of die casting of Ultra-Low Speed die casting front bearing cover of cam shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420694178.6U CN204220963U (en) | 2014-11-18 | 2014-11-18 | Exhaust structure in a kind of die casting of Ultra-Low Speed die casting front bearing cover of cam shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204220963U true CN204220963U (en) | 2015-03-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420694178.6U Withdrawn - After Issue CN204220963U (en) | 2014-11-18 | 2014-11-18 | Exhaust structure in a kind of die casting of Ultra-Low Speed die casting front bearing cover of cam shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204220963U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104338921A (en) * | 2014-11-18 | 2015-02-11 | 太仓海嘉车辆配件有限公司 | Inner venting structure of pressure casting die of front bearing cap of ultra-low speed pressure casting cam shaft |
-
2014
- 2014-11-18 CN CN201420694178.6U patent/CN204220963U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104338921A (en) * | 2014-11-18 | 2015-02-11 | 太仓海嘉车辆配件有限公司 | Inner venting structure of pressure casting die of front bearing cap of ultra-low speed pressure casting cam shaft |
| CN104338921B (en) * | 2014-11-18 | 2016-08-31 | 苏州梅克卡斯汽车科技有限公司 | 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150325 Effective date of abandoning: 20160831 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |