CN105215329A - A kind of casting method of the power-assisted vavuum pump housing that brakes - Google Patents
A kind of casting method of the power-assisted vavuum pump housing that brakes Download PDFInfo
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- CN105215329A CN105215329A CN201510592998.3A CN201510592998A CN105215329A CN 105215329 A CN105215329 A CN 105215329A CN 201510592998 A CN201510592998 A CN 201510592998A CN 105215329 A CN105215329 A CN 105215329A
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Abstract
The invention provides a kind of casting method of the power-assisted vavuum pump housing that brakes, utilize the chance taking the method for degasification minimizing air to be involved in fusion process, what elimination there will be when in casting process, motlten metal injection enters die cavity is involved in air, the problems such as molten metal casting is not enough, often easily there is pore in the aluminium alloy castings reducing brake power-assisted vavuum pump housing, shrinkage cavity, the defect problems such as seepage, and adopt unequal pressure casting method, because this casting technique has very strong hot feeding capacity, molten metal is solidification and crystallization under the effect of two-way pressure difference, brake power-assisted vavuum pump housing microstructure is loose significantly to be reduced, organize finer and close, power-assisted vavuum pump Shell Mechanics performance of simultaneously braking significantly improves.
Description
Technical field
The present invention relates to a kind of casting method of the power-assisted vavuum pump housing that brakes.
Background technology
Existing braking automobile power-assisted vavuum pump housing mostly adopts pouring procedure to be made by aluminum alloy die casting, due to the complex structure of brake power-assisted vavuum pump shell casting, wall unevenness is even, there will be when motlten metal injection enters die cavity in casting process and be involved in air, molten metal casting is not enough, therefore often easily there is pore in braking automobile power-assisted vavuum pump housing aluminum alloy die casting, shrinkage cavity, the defect problems such as seepage, defect rate is high, raw material and energy waste serious, production cost is high, production efficiency is low, and wearability, corrosion resistance is poor, thermal coefficient of expansion is higher.Existing casting method complex process product quality is not easy to control, and Stress control is unreasonable, if automobile employs the braking automobile power-assisted vavuum pump housing of existing defects problem, be so easy to security incident occurs, consequence dare not be imagined.
Summary of the invention
The present invention is directed to above-mentioned prior art Problems existing and make improvement, namely technical problem to be solved by this invention is to provide a kind of silumin braking automobile power-assisted vavuum pump die casting for shell forming method, this method of squeeze forming can manufacture the silumin plunger type brake pump die casting for shell part product of the high-quality without casting flaw effectively, and product has and the advantage that wearability, corrosion resistance better, thermal coefficient of expansion is lower.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of casting method of the power-assisted vavuum pump housing that brakes, and carries out according to the following steps:
Step one: (1) dries: first remove the remaining coating of fusing instrument and oxide layer, fusing instrument is first cleaned out, after 350 ~ 400 DEG C of preheatings, spraying one deck protective coating at surface uniform, then within more than 0.5 hour, drying to turning to be yellow for subsequent use in 400 ~ 600 DEG C of maintenances;
(2) preheating dehumidifying: need fully to dewater, dry to industrial additive, smelting equipment is first preheating before use, reduce the material that moisture content increases melt gases content, described preheating dehumidification treatments is at 100-150 DEG C of insulation 20-30min by industrial additive;
Step 2: melting: prepare burden according to given Ingredients Weight proportioning, fine aluminium 70 ~ 75%, solid silicon 10 ~ 20% are added induction melting furnace simultaneously, be warming up to 1550-1600 degree, after it melts completely, add the industrial Cr additive that 10 ~ 20% contain 65%Cr; Inert gas shielding method is adopted to prevent aluminium alloy from sucking hydrogen in fusion process, and adopt the gas content rotated in degasification method minimizing alloy liquid, add coverture to cover, start to stir, after adjusting component, add refining agent after skimming and add slag former through refining degasification simultaneously, stir, leaving standstill and carry out again taking off Slag treatment, checking refining effect by surveying hydrogen online, until meet the requirements, obtain qualified composition;
Step 3: anisobaric is cast: the aluminium alloy handled well is injected cast insulation crucible, carry out debugging to casting machine to prepare simultaneously, the stalk being preheated to 150 DEG C ~ 200 DEG C is installed on holding furnace, carry out preheated mold simultaneously, by mould and die preheating to after 200 DEG C ~ 250 DEG C to mold cavity stenciling coating, then matched moulds, aluminium alloy in crucible is injected mould and carry out the rising liquid, fill type of anisobaric casting, pressurize, release: setting anisobaric casting technological parameter: setting bleed pressure 0.8 ~ 1.0Mpa, simultaneous pressure 0.6 ~ 0.7Mpa, rise liquid speed 60 ~ 63mm/s, filling velocity 55 ~ 65mm/s, pumping rate is 100mm/s, crystallization boost pressure 0.01 ~ 0.015Mpa, open communicating valve and High-pressure air valve, make, identical operating pressure 2.2MPa is synchronously reached in lower work tank, pass into compressed air to mold cavity and crucible simultaneously, regulate and rise hydraulic coupling 0.1MPa ~ 0.12MPa, mold filling pressure 0.1MPa ~ 0.12MPa, melt in lower work tank crucible under the effect of different pressure through stalk along antigravity direction filling quartz sand casting mold, fill after type completes and continue supercharging according to the pumping rate 100mm/s of setting, pressurize is carried out when the difference of the pressure of upper work tank and lower work tank reaches 0.07MPa, dwell time is 3 ~ 5min, aluminium alloy injects mould reposefully, and pressure not wait effect under solidification and crystallization formed foundry goods, crystallization time controls at 10s ~ 20s, and the dwell time controls at 60s ~ 100s, takes out foundry goods after release,
Step 4: inspection: comprise, by water examination, air-leakage test is carried out to brake power-assisted vavuum pump housing.
Further, argon gas is utilized to revolve in step 2 to blow machine SG-III to implement to rotate degasification method
The gas content in foundry goods is made to reduce the defect problem such as pore, shrinkage cavity, seepage eliminating and often easily occur by dehydrogenation operation, utilize anisobaric to cast the product adopting rational setting parameter and step that the more existing casting method of this casting technique is produced and there is very strong hot feeding capacity, molten metal is solidification and crystallization under the effect of two-way pressure difference, Technique of Casting Microstructure is loose significantly to be reduced, organize finer and close, mechanical castings significantly improves simultaneously.
Accompanying drawing explanation
Fig. 1 is the micrograph of the vavuum pump housing tissue that conventional method manufactures;
Fig. 2 is the micrograph of the vavuum pump housing tissue using present invention process step and setting parameter to produce;
Fig. 3 is the tension test fracture picture of the vavuum pump housing tissue using present invention process step and setting parameter to produce.
Detailed description of the invention
Below with reference to specific embodiment, technical scheme provided by the invention is described in detail, following detailed description of the invention should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.
Embodiment one
A casting method for power-assisted of braking vavuum pump housing, carry out according to the following steps:
Step one: (1) dries: first remove the remaining coating of fusing instrument and oxide layer, fusing instrument is first cleaned out, and sprays one deck protective coating after 350 DEG C of preheatings at surface uniform, then dries to turning to be yellow for subsequent use in more than 0.5 hour in 400 DEG C of maintenances;
(2) preheating dehumidifying: need fully to dewater, dry to industrial additive, smelting equipment is first preheating before use, reduces the material that moisture content etc. increases melt gases content, described preheating dehumidification treatments is at 100 DEG C of insulation 30min by industrial additive;
Step 2: melting: prepare burden according to given Ingredients Weight proportioning, fine aluminium 70 ~ 75%, solid silicon 10 ~ 20% are added induction melting furnace simultaneously, be warming up to 1550-1600 degree, after it melts completely, add the industrial Cr additive that 10 ~ 20% contain 65%Cr; Inert gas shielding method is adopted to prevent aluminium alloy from sucking hydrogen in fusion process, and adopt argon gas to revolve to blow machine SG-III to rotate degasification to reduce gas content in alloy liquid, add coverture to cover, start to stir, after adjusting component, add refining agent after skimming and add slag former through refining degasification simultaneously, stir, leaving standstill and carry out again taking off Slag treatment, checking refining effect by surveying hydrogen online; Until meet the requirements, obtain qualified composition;
Step 3: anisobaric is cast: the aluminium alloy handled well is injected cast insulation crucible; Carry out debugging to casting machine to prepare simultaneously, the stalk being preheated to 150 DEG C is installed on holding furnace; Carry out preheated mold simultaneously, by mould and die preheating to after 200 DEG C to mold cavity stenciling coating, then matched moulds; Aluminium alloy in crucible is injected mould and carry out the rising liquid, fill type of anisobaric casting, pressurize, release: setting anisobaric casting technological parameter: setting bleed pressure 0.8Mpa, simultaneous pressure 0.6Mpa, rise liquid speed 60mm/s, filling velocity 55mm/s, pumping rate is 100mm/s, crystallization boost pressure 0.01Mpa; Pass into compressed air to mold cavity and crucible simultaneously, regulate and rise hydraulic coupling 0.1MPa, mold filling pressure 0.1MPa, melt in lower work tank crucible under the effect of different pressure through stalk along antigravity direction filling quartz sand casting mold, fill after type completes and continue supercharging according to the pumping rate 100mm/s of setting, carry out pressurize when the difference of the pressure of upper work tank and lower work tank reaches 0.07MPa, the dwell time is 3min; Aluminium alloy injects mould reposefully, and pressure not wait effect under solidification and crystallization formed foundry goods, crystallization time controls at 10s, and the dwell time controls at 60s, takes out foundry goods after release;
Step 4: inspection: comprise, by water examination, air-leakage test is carried out to brake power-assisted vavuum pump housing.
Embodiment two
A casting method for power-assisted of braking vavuum pump housing, carry out according to the following steps:
Step one: (1) dries: first remove the remaining coating of fusing instrument and oxide layer, fusing instrument is first cleaned out, and sprays one deck protective coating after 400 DEG C of preheatings at surface uniform, then dries to turning to be yellow for subsequent use in more than 0.5 hour in 600 DEG C of maintenances;
(2) preheating dehumidifying: need fully to dewater, dry to industrial additive, smelting equipment is first preheating before use, reduces the material that moisture content etc. increases melt gases content, described preheating dehumidification treatments is at 150 DEG C of insulation 30min by industrial additive;
Step 2: melting: prepare burden according to given Ingredients Weight proportioning, fine aluminium 70 ~ 75%, solid silicon 10 ~ 20% are added induction melting furnace simultaneously, be warming up to 1550-1600 degree, after it melts completely, add the industrial Cr additive that 10 ~ 20% contain 65%Cr; Inert gas shielding method is adopted to prevent aluminium alloy from sucking hydrogen in fusion process, and adopt argon gas to revolve to blow machine SG-III to rotate degasification to reduce gas content in alloy liquid, add coverture to cover, start to stir, after adjusting component, add refining agent after skimming and add slag former through refining degasification simultaneously, stir, leaving standstill and carry out again taking off Slag treatment, checking refining effect by surveying hydrogen online; Until meet the requirements, obtain qualified composition;
Step 3: anisobaric is cast: the aluminium alloy handled well is injected cast insulation crucible; Carry out debugging to casting machine to prepare simultaneously, the stalk being preheated to 200 DEG C is installed on holding furnace; Carry out preheated mold simultaneously, by mould and die preheating to after 250 DEG C to mold cavity stenciling coating, then matched moulds; Aluminium alloy in crucible is injected mould and carry out the rising liquid, fill type of anisobaric casting, pressurize, release: setting anisobaric casting technological parameter: setting bleed pressure 1.0Mpa, simultaneous pressure 0.7Mpa, rise liquid speed 63mm/s, filling velocity 65mm/s, pumping rate is 100mm/s, crystallization boost pressure 0.015Mpa; Pass into compressed air to mold cavity and crucible simultaneously, regulate and rise hydraulic coupling 0.12MPa, mold filling pressure 0.12MPa, melt in lower work tank crucible under the effect of different pressure through stalk along antigravity direction filling quartz sand casting mold, fill after type completes and continue supercharging according to the pumping rate 100mm/s of setting, carry out pressurize when the difference of the pressure of upper work tank and lower work tank reaches 0.07MPa, the dwell time is 5min; Aluminium alloy injects mould reposefully, and pressure not wait effect under solidification and crystallization formed foundry goods, crystallization time controls at 20s, and the dwell time controls at 100s, takes out foundry goods after release;
Step 4: inspection: comprise, by water examination, air-leakage test is carried out to brake power-assisted vavuum pump housing.
Embodiment three
A casting method for power-assisted of braking vavuum pump housing, carry out according to the following steps:
Step one: (1) dries: first remove the remaining coating of fusing instrument and oxide layer, fusing instrument is first cleaned out, and sprays one deck protective coating after 375 DEG C of preheatings at surface uniform, then dries to turning to be yellow for subsequent use in more than 0.5 hour in 500 DEG C of maintenances;
(2) preheating dehumidifying: need fully to dewater, dry to industrial additive, smelting equipment is first preheating before use, reduces the material that moisture content etc. increases melt gases content, described preheating dehumidification treatments is at 130 DEG C of insulation 25min by industrial additive;
Step 2: melting: prepare burden according to given Ingredients Weight proportioning, fine aluminium 70 ~ 75%, solid silicon 10 ~ 20% are added induction melting furnace simultaneously, be warming up to 1550-1600 degree, after it melts completely, add the industrial Cr additive that 10 ~ 20% contain 65%Cr; Inert gas shielding method is adopted to prevent aluminium alloy from sucking hydrogen in fusion process, and adopt argon gas to revolve to blow machine SG-III to rotate degasification to reduce gas content in alloy liquid, add coverture to cover, start to stir, after adjusting component, add refining agent after skimming and add slag former through refining degasification simultaneously, stir, leaving standstill and carry out again taking off Slag treatment, checking refining effect by surveying hydrogen online; Until meet the requirements, obtain qualified composition;
Step 3: anisobaric is cast: the aluminium alloy handled well is injected cast insulation crucible; Carry out debugging to casting machine to prepare simultaneously, the stalk being preheated to 180 DEG C is installed on holding furnace; Carry out preheated mold simultaneously, by mould and die preheating to after 230 DEG C to mold cavity stenciling coating, then matched moulds; Aluminium alloy in crucible is injected mould and carry out the rising liquid, fill type of anisobaric casting, pressurize, release: setting anisobaric casting technological parameter: setting bleed pressure 0.9Mpa, simultaneous pressure 0.65Mpa, rise liquid speed 62mm/s, filling velocity 60mm/s, pumping rate is 100mm/s, crystallization boost pressure 0.012Mpa; Pass into compressed air to mold cavity and crucible simultaneously, regulate and rise hydraulic coupling 0.11MPa, mold filling pressure 0.11MPa, melt in lower work tank crucible under the effect of different pressure through stalk along antigravity direction filling quartz sand casting mold, fill after type completes and continue supercharging according to the pumping rate 100mm/s of setting, carry out pressurize when the difference of the pressure of upper work tank and lower work tank reaches 0.07MPa, the dwell time is 4min; Aluminium alloy injects mould reposefully, and pressure not wait effect under solidification and crystallization formed foundry goods, crystallization time controls at 10s ~ 20s, and the dwell time controls at 80s, takes out foundry goods after release;
Step 4: inspection: comprise, by water examination, air-leakage test is carried out to brake power-assisted vavuum pump housing.
Little by showing the vavuum pump housing even tissue, the crystallite dimension that make to cast out by the setting of above processing step and technological parameter in Fig. 1 and Fig. 2, concrete by advantages such as Fig. 3 display defect are few.Showing that the vavuum pump housing using present invention process step and setting parameter to produce has good mechanical property by testing further, seeing table.
| Tensile strength (σ b/MPa) | Offset yield strength (σ 0.2/MPa) | Percentage elongation (δ/%) | |
| Conventional method | 300 | 218 | 6 |
| The inventive method | 320 | 230 | 8 |
| Increase rate | 7 | 5 | 33 |
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (3)
1. a brake power-assisted vavuum pump shell cast method, carries out: drying plant → preheating dehumidifying → raw material melting → setting casting parameter → cast → come out of the stove according to the following steps; Described casting process carries out according to the following steps: aluminium alloy is injected mould and carry out the rising liquid, fill type of pressure change casting, pressurize, release.
2. the casting method of a kind of power-assisted vavuum pump housing that brakes according to claim 1, specifically carry out according to the following steps:
Step one: (1) dries: first remove the remaining coating of fusing instrument and oxide layer, smelting equipment is first cleaned out, after 350 ~ 400 DEG C of preheatings, spraying one deck protective coating at surface uniform, then within more than 0.5 hour, drying to turning to be yellow for subsequent use in 400 ~ 600 DEG C of maintenances;
(2) preheating dehumidifying: need fully to dewater, dry to industrial additive, smelting equipment is first preheating before use, reduce the material that moisture content increases melt gases content, described preheating dehumidification treatments is at 100-150 DEG C of insulation 20-30min by industrial additive;
Step 2: melting: prepare burden according to given Ingredients Weight proportioning, fine aluminium 70 ~ 75%, solid silicon 10 ~ 20% are added induction melting furnace simultaneously, be warming up to 1550-1600 degree, after it melts completely, add the industrial Cr additive that 10 ~ 20% contain 65%Cr; Inert gas shielding method is adopted to prevent aluminium alloy from sucking hydrogen in fusion process, and adopt the gas content rotated in degasification method minimizing alloy liquid, add coverture to cover, start to stir, after adjusting component, add refining agent after skimming and add slag former through refining degasification simultaneously, stir, leaving standstill and carry out again taking off Slag treatment, checking refining effect by surveying hydrogen online, until meet the requirements, obtain qualified composition;
Step 3: anisobaric is cast: the aluminium alloy handled well is injected cast insulation crucible; Carry out debugging to casting machine to prepare simultaneously, the stalk being preheated to 150 DEG C ~ 200 DEG C is installed on holding furnace; Carry out preheated mold simultaneously, by mould and die preheating to after 200 DEG C ~ 250 DEG C to mold cavity stenciling coating, then matched moulds; Aluminium alloy in crucible is injected mould and carry out the rising liquid, fill type of anisobaric casting, pressurize, release: setting anisobaric casting technological parameter: setting bleed pressure 0.8 ~ 1.0Mpa, simultaneous pressure 0.6 ~ 0.7Mpa, rise liquid speed 60 ~ 63mm/s, filling velocity 55 ~ 65mm/s, pumping rate is 100mm/s, crystallization boost pressure 0.01 ~ 0.015Mpa; Pass into compressed air to mold cavity and crucible simultaneously, regulate and rise hydraulic coupling 0.1MPa ~ 0.12MPa, mold filling pressure 0.1MPa ~ 0.12MPa, melt in lower work tank crucible under the effect of different pressure through stalk along antigravity direction filling quartz sand casting mold, fill after type completes and continue supercharging according to the pumping rate 100mm/s of setting, carry out pressurize when the difference of the pressure of upper work tank and lower work tank reaches 0.07MPa, the dwell time is 3 ~ 5min; Aluminium alloy injects mould reposefully, and pressure not wait effect under solidification and crystallization formed foundry goods, crystallization time controls at 10s ~ 20s, and the dwell time controls at 60s ~ 100s, takes out foundry goods after release;
Step 4: inspection: comprise, by water examination, air-leakage test is carried out to brake power-assisted vavuum pump housing.
3. the casting method of a kind of power-assisted vavuum pump housing that brakes according to claim 2, is characterized in that: utilize argon gas to revolve in described step 2 to blow machine SG-III to implement to rotate degasification method.
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Cited By (5)
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| CN105880531A (en) * | 2016-04-20 | 2016-08-24 | 江苏南山冶金机械制造有限公司 | Outer wall treatment process for carbon sleeve roller core |
| CN107794417A (en) * | 2017-10-20 | 2018-03-13 | 温岭市方鑫机电有限公司 | A kind of production technology of motor case |
| CN108393437A (en) * | 2018-02-09 | 2018-08-14 | 江苏恒高精密成型科技有限公司 | A kind of production technology of cast housing |
| CN108746552A (en) * | 2018-04-18 | 2018-11-06 | 益阳仪纬科技有限公司 | A kind of casting method of thin-wall case aluminium alloy castings |
| CN117884603A (en) * | 2024-03-18 | 2024-04-16 | 北京航空航天大学 | Vacuum pressure-regulating casting method for aluminum-based composite brake disc |
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| CN117884603A (en) * | 2024-03-18 | 2024-04-16 | 北京航空航天大学 | Vacuum pressure-regulating casting method for aluminum-based composite brake disc |
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Application publication date: 20160106 |