CN104907533A - Extrusion casting method for hub workblank - Google Patents
Extrusion casting method for hub workblank Download PDFInfo
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- CN104907533A CN104907533A CN201510226130.1A CN201510226130A CN104907533A CN 104907533 A CN104907533 A CN 104907533A CN 201510226130 A CN201510226130 A CN 201510226130A CN 104907533 A CN104907533 A CN 104907533A
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- formpiston
- overcoat
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Abstract
The invention relates to an extrusion casting method for a hub workblank. The method comprises the steps that the overflowing type local pressure supplementing extrusion casting technology is adopted, firstly, total pressure is exerted on molten aluminum alloy through a male mold and a male mold housing, and after a spoke with the small thickness obtained through pressure maintaining is partially solidified under the extrusion casting specific pressure, an overflowing pressure intensity value of an overflowing valve connected with an oil outlet hole is adjusted to be lower than the extrusion casting specific pressure; accordingly, the pressure exerted on the male mold is decreased by delta P, and the pressure exerted on the male mold housing is increased by delta P correspondingly; as a result, the male mold housing can exert larger pressure on the rim portion with the large thickness and unsolidified molten aluminum alloy and a casting hot spot of the transition portion of the rim and the spoke, local pressure supplementing is performed, and hydraulic oil inside an oil storage cylinder overflows from the oil outlet hole along with descending of the male mold housing, relative displacement is generated between the male mold and the male mold housing, so that the obstruction formed by the solidified spoke with the small thickness on continuous descending of the male mold housing is eliminated, and the phenomenon that a shrinkage cavity and looseness are likely to be formed in the portion is relieved or eliminated.
Description
Technical field
The present invention relates to metal working technical area, particularly the extrusion casint field of heavy vehicle aluminum alloy hub blank, specifically refer to a kind of overflow-type local repair pressure extrusion casting method of wheel hub blank.
Background technology
Domestic and international heavy vehicle aluminum alloy hub blank can adopt Forging Technology to be shaped or direct-type Extrution casting technique is shaped, and adopt the existence of Forging Technology shaping heavy vehicle aluminum alloy hub blank to need the problems such as great tonnage hydraulic equipment, technological process is complicated, production cost is high, so, adopt direct-type Extrution casting technique shaping heavy vehicle aluminum alloy hub blank to become the research emphasis of such technique at present.
Direct-type Extrution casting technique method of the prior art is simple, and mechanical property can reach or close to the horizontal mechanical performance level of reflectal wheel hub, but there are the following problems:
Gauge due to aluminium alloy wheel hub wheel rim position is greater than the gauge at spoke position, after first the spoke position that in extrusion casint process, gauge is less solidifies, the entire lowering of formpiston and formpiston overcoat will be stoped, the aluminum alloy melt of the casting thermal center place ot-yet-hardened of the wheel rim position causing gauge larger, wheel rim and wheel hub intermediate location freely solidifies under without extrusion casint pressure, easily occurs shrinkage cavity and the defect such as loose.
Therefore, for the extrusion casting method of current wheel hub blank, await doing further improvement.
Summary of the invention
Technical problem to be solved by this invention is the present situation for prior art, a kind of extrusion casting method of wheel hub blank is provided, the method can effectively slow down or eliminate larger-size wheel rim position, shrinkage cavity or loose problem easily appear in the casting thermal center place of wheel rim and wheel hub intermediate location, effectively improves the quality of wheel hub blank.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of extrusion casting method of wheel hub blank, it is characterized in that comprising the following steps:
(1) Casting Equipment prepares
This Casting Equipment comprises former, former overcoat, top plug, formpiston, formpiston overcoat, oil storage cylinder and hydraulic press, described former and former overcoat formation one in mating connection top have the accommodating cavity of opening, and what described top plug can move up and down be located on former and upper end can stretch in above-mentioned accommodating cavity;
The top shoe that described oil storage cylinder is fixedly connected on hydraulic press has lower port, be sheathed on outside described formpiston below oil storage cylinder, what described formpiston can move up and down through formpiston overcoat is located in the lower port of oil storage cylinder, and the inwall of the upper surface of described formpiston and oil storage cylinder forms the shoe cream room of oil storage cylinder jointly;
The sidewall of described oil storage cylinder has the fuel feed hole be connected with shoe cream room and oil outlet, outside this fuel feed hole, is connected with oil inlet valve, outside this oil outlet, be connected with an overflow valve;
(2) extrusion casint of wheel hub blank
A) open oil inlet valve, after making hydraulic oil be full of the shoe cream room of oil storage cylinder, close this oil inlet valve, set the overflow pressure values of the overflow valve be connected with oil outlet equal with extrusion casint specific pressure or higher than extrusion casint specific pressure;
B) 160 ~ 200 DEG C are preheated to by filling in by former overcoat, former and top the accommodating cavity formed, formpiston, formpiston overcoat are preheated to 200 ~ 250 DEG C, the aluminum alloy melt of 680 ~ 720 DEG C is poured in the accommodating cavity after preheating, movable hydraulic machine top shoe makes formpiston, formpiston overcoat entire lowering be extrusion casint specific pressure to applying gross pressure to the aluminum alloy melt in accommodating cavity, and pressurize 60 ~ 80s;
C) the overflow pressure values of the overflow valve be connected with oil outlet is down to 50% ~ 60% of extrusion casint specific pressure, release after continuation pressurize 40 ~ 60s;
D) first rising hydraulic press top shoe, removes formpiston, formpiston overcoat and oil storage cylinder, and the top plug that then rises ejects aluminum alloy hub blank from accommodating cavity.
As a further improvement on the present invention, step a) described in the overflow pressure values of overflow valve that is connected with oil outlet higher than extrusion casint specific pressure 3 ~ 5MPa.
As preferably, the periphery on described formpiston top is arranged with a sealing ring, leaks from the junction of formpiston and oil storage cylinder to avoid hydraulic oil.
In such scheme, the lower end of described formpiston overcoat has a convergence part, the inwall of this convergence part and the periphery of described formpiston fit tightly, described step b) under completion status, the periphery of this convergence part and the inwall of described former overcoat fit tightly, adopt this structure, to guarantee that formpiston and formpiston overcoat are stablized the aluminum alloy melt applied pressure in accommodating cavity.
In above-mentioned each preferred version, described extrusion casint specific pressure is that formpiston and formpiston overcoat are to the aluminum alloy melt applied pressure sum in accommodating cavity.
Compared with prior art, the invention has the advantages that:
In the present invention, first formpiston is passed through after extrusion casint starts, formpiston overcoat applies gross pressure to aluminum alloy melt, and pressurize is solidified to the spoke position that gauge is less under this extrusion casint specific pressure, the overflow pressure values of the overflow valve be connected with the oil outlet of oil storage cylinder is adjusted to lower than extrusion casint specific pressure, such formpiston applied pressure will reduce △ P, and formpiston overcoat applied pressure is by corresponding increase △ P, result can make formpiston overcoat larger to gauge, the casting thermal center place of the wheel rim position of aluminum alloy melt ot-yet-hardened and wheel rim and spoke intermediate location exerts pressure larger pressure, carry out local ftercompction, and local repair presses through in journey, along with the continuation of formpiston overcoat declines, hydraulic oil in oil storage cylinder is overflowed by oil outlet, and formpiston and formpiston overcoat produce relative displacement, thus eliminates the obstruction continuing formpiston overcoat to decline in the thinner spoke position of the gauge that solidified.
The present invention adopts overflow-type local repair to press Extrution casting technique, achieve and carry out local ftercompction with the casting thermal center place of larger extrusion casint specific pressure to larger-size wheel rim position, wheel rim and spoke intermediate location, slow down or eliminate shrinkage cavity that this position easily occurs and the defect such as loose.
Accompanying drawing explanation
Fig. 1 is the structural representation of Casting Equipment in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
As shown in Figure 1, the Casting Equipment that the extrusion casting method of wheel hub blank of the present invention adopts comprises former 1, former overcoat 2, top plug 3, formpiston 4, formpiston overcoat 5, oil storage cylinder 6 and hydraulic press (not shown), former 1 and former overcoat 2 formation one in mating connection top have the accommodating cavity 10 of opening, and what top plug 3 can move up and down be located on former 1 and upper end can stretch in above-mentioned accommodating cavity 10.
The top shoe that oil storage cylinder 6 is fixedly connected on hydraulic press has lower port, formpiston overcoat 5 is located at below oil storage cylinder 6, in the lower port being located at oil storage cylinder 6 that formpiston 4 can move up and down through formpiston overcoat 5, and the inwall of the upper surface of formpiston 4 and oil storage cylinder 6 forms the shoe cream room 61 of oil storage cylinder 6 jointly.
The sidewall of oil storage cylinder 6 has the fuel feed hole 62 and oil outlet 63 that are connected with shoe cream room 61, outside this fuel feed hole 62, be connected with oil inlet valve (not shown), outside this oil outlet 63, be connected with an overflow valve (not shown).
The periphery on formpiston 4 top is arranged with a sealing ring 41, leaks from the junction of formpiston 4 with oil storage cylinder 6 to avoid hydraulic oil.The lower end of formpiston overcoat 5 has a convergence part 51, and the inwall of this convergence part 51 and the periphery of formpiston 4 fit tightly, and formpiston overcoat 5 is with under former overcoat 2 apposition, and the periphery of this convergence part 51 and the inwall of former overcoat 2 fit tightly.
Following embodiment is described extrusion casting method for the aluminum alloy hub blank of φ 540mm to adopt 1500 t hydraulic press to manufacture outside diameters.
Embodiment 1:
In the present embodiment, the extrusion casting method of wheel hub blank adopts above-mentioned Casting Equipment to cast, and specifically comprises the following steps:
A) open oil inlet valve, close this oil inlet valve after making hydraulic oil be full of the shoe cream room 61 of oil storage cylinder 6, the overflow pressure values setting the overflow valve be connected with oil outlet 63 is equal with extrusion casint specific pressure 65.5MPa;
B) accommodating cavity 10 be made up of former overcoat 2, former 1 and top plug 3 is preheated to 160 ~ 170 DEG C, formpiston 4, formpiston overcoat 5 are preheated to 200 ~ 210 DEG C, the aluminum alloy melt of 680 ~ 690 DEG C is poured in the accommodating cavity after preheating 10, movable hydraulic machine top shoe makes formpiston 4, formpiston overcoat 5 entire lowering be 65.5MPa to applying gross pressure to the aluminum alloy melt in accommodating cavity 10, and pressurize 60s;
C) the overflow pressure values of the overflow valve be connected with oil outlet is down to 32.8MPa, release after continuation pressurize 40s;
D) rising hydraulic press top shoe, removes formpiston 4, formpiston overcoat 5 and oil storage cylinder 6, and the top plug 3 that rises ejects aluminum alloy hub blank from accommodating cavity 10.
Embodiment 2:
In the present embodiment, the extrusion casting method of wheel hub blank adopts above-mentioned Casting Equipment to cast, and specifically comprises the following steps:
A) open oil inlet valve, close this oil inlet valve after making hydraulic oil be full of the shoe cream room 61 of oil storage cylinder 6, the overflow pressure values setting the overflow valve be connected with oil outlet 63 is 70MPa;
B) accommodating cavity 10 be made up of former overcoat 2, former 1 and top plug 3 is preheated to 175 ~ 185 DEG C, formpiston 4, formpiston overcoat 5 are preheated to 220 ~ 230 DEG C, the aluminum alloy melt of 690 ~ 710 DEG C is poured in the accommodating cavity after preheating 10, movable hydraulic machine top shoe makes formpiston 4, formpiston overcoat 5 entire lowering be 70MPa to applying gross pressure to the aluminum alloy melt in accommodating cavity 10, and pressurize 70s;
C) the overflow pressure values of the overflow valve be connected with oil outlet is down to 36MPa, release after continuation pressurize 50s;
D) rising hydraulic press top shoe, removes formpiston 4, formpiston overcoat 5 and oil storage cylinder 6, and the top plug 3 that rises ejects aluminum alloy hub blank from accommodating cavity 10.
Embodiment 3:
In the present embodiment, the extrusion casting method of wheel hub blank adopts above-mentioned Casting Equipment to cast, and specifically comprises the following steps:
A) open oil inlet valve, close this oil inlet valve after making hydraulic oil be full of the shoe cream room 61 of oil storage cylinder 6, the overflow pressure values setting the overflow valve be connected with oil outlet 63 is 68.5MPa;
B) accommodating cavity 10 be made up of former overcoat 2, former 1 and top plug 3 is preheated to 190 ~ 200 DEG C, formpiston 4, formpiston overcoat 5 are preheated to 240 ~ 250 DEG C, the aluminum alloy melt of 710 ~ 720 DEG C is poured in the accommodating cavity after preheating 10, movable hydraulic machine top shoe makes formpiston 4, formpiston overcoat 5 entire lowering be 65.5MPa to applying gross pressure to the aluminum alloy melt in accommodating cavity 10, and pressurize 80s;
C) the overflow pressure values of the overflow valve be connected with oil outlet is down to 39.3MPa, release after continuation pressurize 60s;
D) rising hydraulic press top shoe, removes formpiston 4, formpiston overcoat 5 and oil storage cylinder 6, and the top plug 3 that rises ejects aluminum alloy hub blank from accommodating cavity 10.
Embodiment 4:
In the present embodiment, the extrusion casting method of wheel hub blank adopts above-mentioned Casting Equipment to cast, and specifically comprises the following steps:
A) open oil inlet valve, close this oil inlet valve after making hydraulic oil be full of the shoe cream room 61 of oil storage cylinder 6, the overflow pressure values setting the overflow valve be connected with oil outlet 63 is 70.5MPa;
B) accommodating cavity 10 be made up of former overcoat 2, former 1 and top plug 3 is preheated to 190 ~ 200 DEG C, formpiston 4, formpiston overcoat 5 are preheated to 240 ~ 250 DEG C, the aluminum alloy melt of 710 ~ 720 DEG C is poured in the accommodating cavity after preheating 10, movable hydraulic machine top shoe makes formpiston 4, formpiston overcoat 5 entire lowering be 65.5MPa to applying gross pressure to the aluminum alloy melt in accommodating cavity 10, and pressurize 80s;
C) the overflow pressure values of the overflow valve be connected with oil outlet is down to 36.7MPa, release after continuation pressurize 60s;
D) rising hydraulic press top shoe, removes formpiston 4, formpiston overcoat 5 and oil storage cylinder 6, and the top plug 3 that rises ejects aluminum alloy hub blank from accommodating cavity 10.
Claims (5)
1. an extrusion casting method for wheel hub blank, is characterized in that comprising the following steps:
(1) Casting Equipment prepares
This Casting Equipment comprises former, former overcoat, top plug, formpiston, formpiston overcoat, oil storage cylinder and hydraulic press, described former and former overcoat formation one in mating connection top have the accommodating cavity of opening, and what described top plug can move up and down be located on former and upper end can stretch in above-mentioned accommodating cavity;
The top shoe that described oil storage cylinder is fixedly connected on hydraulic press has lower port, be sheathed on outside described formpiston below oil storage cylinder, what described formpiston can move up and down through formpiston overcoat is located in the lower port of oil storage cylinder, and the inwall of the upper surface of described formpiston and oil storage cylinder forms the shoe cream room of oil storage cylinder jointly;
The sidewall of described oil storage cylinder has the fuel feed hole be connected with shoe cream room and oil outlet, outside this fuel feed hole, is connected with oil inlet valve, outside this oil outlet, be connected with an overflow valve;
(2) extrusion casint of wheel hub blank
A) open oil inlet valve, after making hydraulic oil be full of the shoe cream room of oil storage cylinder, close this oil inlet valve, set the overflow pressure values of the overflow valve be connected with oil outlet equal with extrusion casint specific pressure or higher than extrusion casint specific pressure;
B) 160 ~ 200 DEG C are preheated to by filling in by former overcoat, former and top the accommodating cavity formed, formpiston, formpiston overcoat are preheated to 200 ~ 250 DEG C, the aluminum alloy melt of 680 ~ 720 DEG C is poured in the accommodating cavity after preheating, movable hydraulic machine top shoe makes formpiston, formpiston overcoat entire lowering be extrusion casint specific pressure to applying gross pressure to the aluminum alloy melt in accommodating cavity, and pressurize 60 ~ 80s;
C) the overflow pressure values of the overflow valve be connected with oil outlet is down to 50% ~ 60% of extrusion casint specific pressure, release after continuation pressurize 40 ~ 60s;
D) first rising hydraulic press top shoe, removes formpiston, formpiston overcoat and oil storage cylinder, and the top plug that then rises ejects aluminum alloy hub blank from accommodating cavity.
2. the extrusion casting method of wheel hub blank according to claim 1, is characterized in that: step a) described in the overflow pressure values of overflow valve that is connected with oil outlet higher than extrusion casint specific pressure 3 ~ 5MPa.
3. the extrusion casting method of wheel hub blank according to claim 1, is characterized in that: the periphery on described formpiston top is arranged with a sealing ring.
4. the extrusion casting method of wheel hub blank according to claim 1, it is characterized in that: the lower end of described formpiston overcoat has a convergence part, the inwall of this convergence part and the periphery of described formpiston fit tightly, described step b) under completion status, the periphery of this convergence part and the inwall of described former overcoat fit tightly.
5. the extrusion casting method of wheel hub blank according to claim 1, is characterized in that: described extrusion casint specific pressure is that formpiston and formpiston overcoat are to the aluminum alloy melt applied pressure sum in accommodating cavity.
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| CN201510226130.1A CN104907533B (en) | 2015-05-05 | 2015-05-05 | Extrusion casting method for hub workblank |
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| CN201510226130.1A CN104907533B (en) | 2015-05-05 | 2015-05-05 | Extrusion casting method for hub workblank |
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| CN104907533B CN104907533B (en) | 2017-02-01 |
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| CN105215327A (en) * | 2015-10-31 | 2016-01-06 | 重庆鼎汉机械有限公司 | The extruding manufacturing process of wheel hub outer ring |
| CN106180643A (en) * | 2016-09-23 | 2016-12-07 | 华南理工大学 | The extrusion casting method of foundry goods |
| CN106180644A (en) * | 2016-09-23 | 2016-12-07 | 广东粤海华金科技股份有限公司 | String cylinder vertical extrusion casting machine |
| CN108080600A (en) * | 2017-11-17 | 2018-05-29 | 中国兵器科学研究院宁波分院 | A kind of method that airport runway center line lamp upper cover blank prepares lamp upper cover blank with squeeze casting mould and its using the mold |
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| CN105215327A (en) * | 2015-10-31 | 2016-01-06 | 重庆鼎汉机械有限公司 | The extruding manufacturing process of wheel hub outer ring |
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| CN108080600A (en) * | 2017-11-17 | 2018-05-29 | 中国兵器科学研究院宁波分院 | A kind of method that airport runway center line lamp upper cover blank prepares lamp upper cover blank with squeeze casting mould and its using the mold |
| CN108080600B (en) * | 2017-11-17 | 2019-09-27 | 中国兵器科学研究院宁波分院 | A method of airport runway center line lamp upper cover blank is prepared with squeeze casting mould |
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| CN104907533B (en) | 2017-02-01 |
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