CN104278180A - Die-casting technology of magnesium alloy gearbox - Google Patents
Die-casting technology of magnesium alloy gearbox Download PDFInfo
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- CN104278180A CN104278180A CN201310293934.4A CN201310293934A CN104278180A CN 104278180 A CN104278180 A CN 104278180A CN 201310293934 A CN201310293934 A CN 201310293934A CN 104278180 A CN104278180 A CN 104278180A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 49
- 238000004512 die casting Methods 0.000 title abstract description 23
- 238000005516 engineering process Methods 0.000 title abstract description 6
- 238000011049 filling Methods 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 239000002994 raw material Substances 0.000 claims abstract description 28
- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 53
- 238000001125 extrusion Methods 0.000 claims description 18
- 238000011068 loading method Methods 0.000 claims description 13
- 239000011777 magnesium Substances 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 238000005266 casting Methods 0.000 abstract description 14
- 238000005429 filling process Methods 0.000 abstract 1
- 239000004576 sand Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 229910000838 Al alloy Inorganic materials 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 238000005242 forging Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention relates to a die-casting technology of a magnesium alloy gearbox. The technology comprises the following steps: preparing the raw material compositions according to the formula, and mixing; heating the mixed raw materials to be under a liquid state or semi-liquid state; under the injection specific pressure of 8-20MPa, filling the obtained raw material under a liquid state or semi-liquid state into a die cavity for 0.01-0.3s at the filling speed of 35-80m/s, wherein during the filling process, the die temperature is at 200-315DEG C, and the pouring temperature is at 600-700DEG C; and after completing filling, maintaining the pressure for 2-8s under 30-80MPa so as to be formed and solidified, to finally obtain a magnesium alloy gearbox casting. The technology of the magnesium alloy gearbox is reasonable and stable, the die-casting forming quality and the surface quality are good, and the rate of finished products is high.
Description
Technical field
The present invention relates to the manufacture technology field of wheel casing, particularly relate to a kind of extrusion process of magnesium alloy gear box.
Background technology
Magnesium alloy has that density is little, specific tenacity and specific rigidity high, and good die casting usability, damping, the feature such as thermal conductivity, machinability, electromagnetic wave shielding, recoverable, obtain in the industries such as 3C, automobile, power tool, aerospace and applied more and more widely, be described as " green " engineering materials that 21 century has development and application value most.
Die casting is a kind of method of casting liquid forging.Transfer mold forging process is a kind of technique completed on special die casting die forging machine.Its basic craft course is: the first low speed of molten metal or high-speed casting fill in the die cavity of type progressive die tool, mould has movable cavity surface, it, along with the process of cooling pressurization forging of molten metal, had both been eliminated the shrinkage porosity defect of contraction cavity of blank, and had also made the interior tissue of blank reach the Broken Crystal of forging state.The comprehensive mechanical performance of blank is significantly improved.
Magnesium alloy parts many employings die casting mode is shaped, and for aluminium alloy compression casting, the setting time of magnesium alloy is shorter, so, require that the die casting filling velocity of magnesium alloy is higher than aluminium alloy, loading time is shorter.Magnesium alloy gear box internal structure is very complicated, casting forming difficulty is quite large, therefore quite harsh to the requirement of the design of magnesium alloy gear box transfer mold, manufacture and extrusion process: require rational mould structure, larger running channel area and reasonably gating system, higher filling velocity, shorter loading time etc.
At present, because starting late in state's endogenous development magnesium alloy aspect, many die casting characteristics of magnesium alloy are also not bery understood, a lot of producer carries out design and production by aluminium alloy casting die scheme, causes the result that magnesium alloy pressure-casting yield rate is lower, defects of die casting (as cold shut, owing casting, piebald etc.) is more.
CN102756075A relates to a kind of casting technique of wheel casing, comprises the following steps: the mould making wheel casing; Mould is fixed on and penetrates on sand machine, be heated to 300-350 DEG C, be incubated 20-40 minute sand to be penetrated; Resin sand being incident upon in mould by penetrating sand machine sand-spraying hole, making resin sand be full of the cavity of mould; Type is repaiied to the resin sand mould after moulding, and at its surface brush coating; Mould, mould assembling are joined to resin sand mould; Box is carried out to resin sand mould; Sprue cup put by the cast gate of mould, rising head is put and emits cup; Cast in the die cavity with bull ladle molten iron being poured into resin sand mould.
Extrusion process is the combined process of 3 of Die Casting large key elements (i.e. alloy for die casting, transfer mold and pressure die-casting machine) being carried out organic assembling.If selected die casting parameter is unreasonable, then may cause the bad defects of die castings such as die casting filling is insufficient, pore, cold shut, piebald, sticking to mould.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, propose a kind of extrusion process of magnesium alloy gear box.
For reaching this object, the present invention by the following technical solutions:
The extrusion process of a kind of magnesium alloy gear box provided by the invention, described magnesium alloy gear box comprises following feed composition by weight percentage: Al4 ~ 8%; Zn0.1 ~ 0.3%; Mn0.2 ~ 0.8%; Surplus is Mg.
In magnesium alloy gear box raw material of the present invention, the weight percent of described Al can select 4.01 ~ 7.96%, 4.3 ~ 7.5%, 4.86 ~ 7.15%, 5 ~ 7%, 5.34 ~ 6.88%, 5.68 ~ 6.4%, 5.9 ~ 6.14% etc.
In magnesium alloy gear box raw material of the present invention, the weight percent of described Zn can select 0.11 ~ 0.29%, 0.14 ~ 0.25%, 0.17 ~ 0.22%, 0.2% etc.
In magnesium alloy gear box raw material of the present invention, the weight percent of described Mn can select 0.21 ~ 0.78%, 0.27 ~ 0.7%, 0.33 ~ 0.64%, 0.4 ~ 0.6%, 0.43 ~ 0.57%, 0.52% etc.
In the present invention, in the feed composition of described magnesium alloy gear box, weight percent≤0.1% of Si, weight percent≤0.01% of Cu, weight percent≤0.002% of Ni, weight percent≤0.005% of Fe.
As the preferred technical solution of the present invention, described magnesium alloy gear box comprises following feed composition by weight percentage: Al6 ~ 6.5%; Zn0.15 ~ 0.22%; Mn0.27 ~ 0.5%; Si≤0.07%, Cu≤0.01%, Ni≤0.001%, Fe≤0.003%, surplus is Mg.
" comprising " of the present invention, mean it except described component, can also comprise other components, these other components give described magnesium alloy gear box different characteristics.In addition, " comprising " of the present invention, can also replace with enclosed " being " or " by ... composition ".
Compared with aluminium alloy, due to magnesium alloy there is low dynamics viscosity, low specific heat capacity and low latent heat of phase change, high workability, setting time are short, make the extrusion process of magnesium alloy parts be different from the extrusion process of aluminum alloy part: to adopt the filling velocity larger than aluminium alloy, the extrusion process of shorter loading time, carry out the casting forming research of magnesium alloy and produce.
Injection ratio pressure is pressure suffered on die casting indoor liquid metallic flat area.The selection of injection ratio pressure, should determine according to different-alloy and casting structure characteristic.The height of injection ratio pressure directly has influence on the roughness on the filling velocity of molten alloy, mobility, the compactness extent of die casting, the clear-cut degree of die casting and surface thereof.And different injection ratio pressures causes molten alloy also different to the degradation degree of cavity surface, thus have influence on the work-ing life of transfer mold.Too high injection ratio pressure may make transfer mold be subject to strongly washing away of molten alloy, increases the possibility of sticking to mould, reduces die life, and easily makes mould by distending.Therefore, under the prerequisite ensureing quality of die casting and service requirements, lower injection ratio pressure should be selected as far as possible.In the present invention, the injection ratio pressure in described technique is 8 ~ 20MPa, such as, can select 8.01 ~ 19.9MPa, 8.4 ~ 19.2MPa, 9 ~ 15MPa, 10.7 ~ 14MPa, 12 ~ 13.4MPa etc., preferably 10 ~ 17MPa, further preferred 15MPa.
Filling velocity is also one of important parameter of extrusion process.The height of filling velocity is directly connected to internal soundness and the visual appearance of die casting: the too small meeting of filling velocity makes the profile of foundry goods unclear, even can not be shaped; Filling velocity is excessive, makes foundry goods glue type, or the void content of cast-internal is increased, and reduces mechanical property.In the present invention, the filling velocity in described technique is 35 ~ 80m/s, such as, can select 35.02 ~ 78.96m/s, 38 ~ 74.3m/s, 43 ~ 70m/s, 48.6 ~ 63.7m/s, 50 ~ 61m/s, 54m/s etc., preferably 40 ~ 60m/s, further preferred 55m/s.
For die casting process of magnesium alloy, loading time is short.In the present invention, the loading time in described technique is 0.01 ~ 0.3s, such as, can select 0.011 ~ 0.298s, 0.018 ~ 0.26s, 0.025 ~ 0.22s, 0.04 ~ 0.17s, 0.06 ~ 0.12s, 0.086 ~ 0.1s, 0.09s etc., further preferred 0.2s.
Because magnesium alloy heat radiation is very fast, be therefore necessary to carry out preheating, heating or cooling process to mould, to maintain the stable of die temperature, improve casting forming quality and surface quality.In technique of the present invention, die temperature is 200 ~ 315 DEG C, such as, can select 200.03 ~ 314.9 DEG C, 208 ~ 307 DEG C, 223 ~ 296.5 DEG C, 240 ~ 286 DEG C, 256.7 ~ 270 DEG C, 264 DEG C etc., preferably 220 ~ 280 DEG C, preferably 250 DEG C further.
Teeming temperature is too high, then alloy shrinkage is large, foundry goods is easily cracked, coarse grains, fragility; Teeming temperature is too low, easily produces the defects such as cold shut, flow liner and misrun.In order to improve casting forming quality, choosing of teeming temperature generally should be considered with injection pressure, filling velocity and die temperature simultaneously.In technique of the present invention, the teeming temperature of magnesium alloy is 600 ~ 700 DEG C, such as, can select 600.2 ~ 698.8 DEG C, 625 ~ 680.7 DEG C, 643 ~ 672.1 DEG C, 650 ~ 662.8 DEG C, 655 DEG C etc., preferably 635 ~ 680 DEG C, preferably 650 DEG C further.
The effect of pressurize is to make pressure pass to not solidified metal, makes its under high pressure crystallization, to obtain the die casting of dense structure.Its time length depends on material and the thickness of foundry goods.In described technique, the dwell time is 2 ~ 8s, such as 2.01 ~ 7.89s, 2.3 ~ 7.5s, 2.66 ~ 7s, 3 ~ 6.2s, 3.75 ~ 5.8s, 4 ~ 5.2s, 4.4s etc., preferably 3 ~ 5s, further preferred 4s.
An extrusion process for magnesium alloy gear box, described processing condition comprise the following steps through optimizing:
(1) mix according to formula ratio preparation raw material component;
(2) by mixed heating raw materials to liquid or semi liquid state shape;
(3) under the injection ratio pressure of 8 ~ 20MPa, the liquid state that step (2) is obtained or semi liquid state raw material enter in mould cavity with the filling velocity filling of 35 ~ 80m/s, and loading time is 0.01 ~ 0.3s, in stowing operation, die temperature is 200 ~ 315 DEG C, and teeming temperature is 600 ~ 700 DEG C;
(4) after filling completes, pressurize 2 ~ 8s makes it shapingly solidify, and finally obtains magnesium alloy gear box foundry goods.
Compared with prior art scheme, the present invention has following beneficial effect:
Magnesium alloy gear box extrusion process of the present invention rationally, stable, casting forming quality and surface quality good, yield rate is high.
The present invention is described in more detail below.But following example is only simple and easy example of the present invention, and do not represent or limit the scope of the present invention, protection scope of the present invention is as the criterion with claims.
Embodiment
For better the present invention being described, be convenient to understand technical scheme of the present invention, typical but non-limiting embodiment of the present invention is as follows:
Embodiment 1
An extrusion process for magnesium alloy gear box, described technique comprises the steps:
(1) mix according to formula ratio preparation raw material component: Al8%; Zn0.1%; Mn0.2%; Surplus is Mg;
(2) by mixed heating raw materials to liquid or semi liquid state shape;
(3) under the injection ratio pressure of 20MPa, the liquid state that step (2) is obtained or semi liquid state raw material enter in mould cavity with the filling velocity filling of 80m/s, and loading time is 0.01s, and in stowing operation, die temperature is 315 DEG C, and teeming temperature is 600 DEG C;
(4) after filling completes, under 30MPa, pressurize 8s makes it shapingly solidify, and finally obtains magnesium alloy gear box foundry goods.
Embodiment 2
An extrusion process for magnesium alloy gear box, described technique comprises the steps:
(1) mix according to formula ratio preparation raw material component: Al4%; Zn0.3%; Mn0.8%; Surplus is Mg;
(2) by mixed heating raw materials to liquid or semi liquid state shape;
(3) under the injection ratio pressure of 8MPa, the liquid state that step (2) is obtained or semi liquid state raw material enter in mould cavity with the filling velocity filling of 35m/s, and loading time is 0.3s, and in stowing operation, die temperature is 200 DEG C, and teeming temperature is 700 DEG C;
(4) after filling completes, under 80MPa, pressurize 2s makes it shapingly solidify, and finally obtains magnesium alloy gear box foundry goods.
Embodiment 3
An extrusion process for magnesium alloy gear box, described technique comprises the steps:
(1) mix according to formula ratio preparation raw material component: Al5%; Zn0.15%; Mn0.7%; Si≤0.1%, Cu≤0.01%, Ni≤0.002%, Fe≤0.005%, surplus is Mg;
(2) by mixed heating raw materials to liquid or semi liquid state shape;
(3) under the injection ratio pressure of 10MPa, the liquid state that step (2) is obtained or semi liquid state raw material enter in mould cavity with the filling velocity filling of 60m/s, and loading time is 0.2s, and in stowing operation, die temperature is 220 DEG C, and teeming temperature is 680 DEG C;
(4) after filling completes, under 60MPa, pressurize 3s makes it shapingly solidify, and finally obtains magnesium alloy gear box foundry goods.
Embodiment 4
An extrusion process for magnesium alloy gear box, described technique comprises the steps:
(1) mix according to formula ratio preparation raw material component: Al6.5%; Zn0.15%; Mn0.27%; Si≤0.07%, Cu≤0.01%, Ni≤0.001%, Fe≤0.003%, surplus is Mg;
(2) by mixed heating raw materials to liquid or semi liquid state shape;
(3) under the injection ratio pressure of 17MPa, the liquid state that step (2) is obtained or semi liquid state raw material enter in mould cavity with the filling velocity filling of 40m/s, and loading time is 0.1s, and in stowing operation, die temperature is 280 DEG C, and teeming temperature is 635 DEG C;
(4) after filling completes, under 45MPa, pressurize 5s makes it shapingly solidify, and finally obtains magnesium alloy gear box foundry goods.
Embodiment 5
An extrusion process for magnesium alloy gear box, described technique comprises the steps:
(1) mix according to formula ratio preparation raw material component: Al6%; Zn0.22%; Mn0.5%; Si≤0.07%, Cu≤0.01%, Ni≤0.001%, Fe≤0.003%, surplus is Mg;
(2) by mixed heating raw materials to liquid or semi liquid state shape;
(3) under the injection ratio pressure of 15MPa, the liquid state that step (2) is obtained or semi liquid state raw material enter in mould cavity with the filling velocity filling of 55m/s, and loading time is 0.2s, and in stowing operation, die temperature is 250 DEG C, and teeming temperature is 650 DEG C;
(4) after filling completes, under 55MPa, pressurize 4s makes it shapingly solidify, and finally obtains magnesium alloy gear box foundry goods.
Applicant states, person of ordinary skill in the field is on the basis of above-described embodiment, by the concrete content point value of above-described embodiment component, combined with the technical scheme of summary of the invention part, thus the new numerical range produced, also be one of record scope of the present invention, the application, for making specification sheets simple and clear, no longer enumerates these numerical ranges.
Applicant states, the present invention illustrates processing step of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned processing step, does not namely mean that the present invention must rely on above-mentioned processing step and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of raw material selected by the present invention, all drops within protection scope of the present invention and open scope.
Claims (10)
1. an extrusion process for magnesium alloy gear box, is characterized in that, described magnesium alloy gear box comprises following feed composition by weight percentage: Al4 ~ 8%; Zn0.1 ~ 0.3%; Mn0.2 ~ 0.8%; Surplus is Mg.
2. technique as claimed in claim 1, is characterized in that, in the feed composition of described magnesium alloy gear box, and weight percent≤0.1% of Si, weight percent≤0.01% of Cu, weight percent≤0.002% of Ni, weight percent≤0.005% of Fe.
3. technique as claimed in claim 1 or 2, it is characterized in that, described magnesium alloy gear box comprises following feed composition by weight percentage: Al6 ~ 6.5%; Zn0.15 ~ 0.22%; Mn0.27 ~ 0.5%; Si≤0.07%, Cu≤0.01%, Ni≤0.001%, Fe≤0.003%, surplus is Mg.
4. the technique as described in one of claim 1-3, is characterized in that, the injection ratio pressure in described technique is 8 ~ 20MPa, preferably 10 ~ 17MPa, further preferred 15MPa.
5. the technique as described in one of claim 1-4, is characterized in that, the filling velocity in described technique is 35 ~ 80m/s, preferably 40 ~ 60m/s, further preferred 55m/s.
6. the technique as described in one of claim 1-5, is characterized in that, the loading time in described technique is 0.01 ~ 0.3s, further preferred 0.2s.
7. the technique as described in one of claim 1-6, is characterized in that, in described technique, die temperature is 200 ~ 315 DEG C, preferably 220 ~ 280 DEG C, preferably 250 DEG C further.
8. the technique as described in one of claim 1-7, is characterized in that, in described technique, the teeming temperature of magnesium alloy is 600 ~ 700 DEG C, preferably 635 ~ 680 DEG C, preferably 650 DEG C further.
9. the technique as described in one of claim 1-8, is characterized in that, in described technique, supercharging specific pressure is 30 ~ 80MPa, preferably 45 ~ 60MPa, further preferred 55MPa;
Preferably, the dwell time is 2 ~ 8s, preferably 3 ~ 5s, further preferred 4s.
10. the technique as described in one of claim 1-9, is characterized in that, described technique comprises the following steps:
(1) mix according to formula ratio preparation raw material component;
(2) by mixed heating raw materials to liquid or semi liquid state shape;
(3) under the injection ratio pressure of 8 ~ 20MPa, the liquid state that step (2) is obtained or semi liquid state raw material enter in mould cavity with the filling velocity filling of 35 ~ 80m/s, and loading time is 0.01 ~ 0.3s, in stowing operation, die temperature is 200 ~ 315 DEG C, and teeming temperature is 600 ~ 700 DEG C;
(4) after filling completes, under 30 ~ 80MPa, pressurize 2 ~ 8s makes it shapingly solidify, and finally obtains magnesium alloy gear box foundry goods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310293934.4A CN104278180A (en) | 2013-07-12 | 2013-07-12 | Die-casting technology of magnesium alloy gearbox |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310293934.4A CN104278180A (en) | 2013-07-12 | 2013-07-12 | Die-casting technology of magnesium alloy gearbox |
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| Publication Number | Publication Date |
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| CN104278180A true CN104278180A (en) | 2015-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310293934.4A Pending CN104278180A (en) | 2013-07-12 | 2013-07-12 | Die-casting technology of magnesium alloy gearbox |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817601A (en) * | 2015-09-09 | 2016-08-03 | 广东鸿泰南通精机科技有限公司 | Manufacturing method for vehicle gearbox shell |
| CN112172405A (en) * | 2020-09-15 | 2021-01-05 | 浙江保康轮毂制造有限公司 | Manufacturing process for truck hub made of A356 aluminum |
-
2013
- 2013-07-12 CN CN201310293934.4A patent/CN104278180A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817601A (en) * | 2015-09-09 | 2016-08-03 | 广东鸿泰南通精机科技有限公司 | Manufacturing method for vehicle gearbox shell |
| CN112172405A (en) * | 2020-09-15 | 2021-01-05 | 浙江保康轮毂制造有限公司 | Manufacturing process for truck hub made of A356 aluminum |
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Application publication date: 20150114 |