CN101912944B - Method for machining aluminum alloy hub - Google Patents

Method for machining aluminum alloy hub Download PDF

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Publication number
CN101912944B
CN101912944B CN2010102427592A CN201010242759A CN101912944B CN 101912944 B CN101912944 B CN 101912944B CN 2010102427592 A CN2010102427592 A CN 2010102427592A CN 201010242759 A CN201010242759 A CN 201010242759A CN 101912944 B CN101912944 B CN 101912944B
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China
Prior art keywords
mould
counterdie
forging
patrix
wheel hub
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Expired - Fee Related
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CN2010102427592A
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Chinese (zh)
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CN101912944A (en
Inventor
孙惠学
汪以祥
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Yanshan University
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Yanshan University
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Abstract

The invention discloses a method for machining an aluminum alloy hub. The method mainly comprises the following steps of: taking a semi-solid alloy thixoformed bar stock as a manufacturing material; remelting and heating the bar stock to the temperature of 585 +/-10 DEG C in an electromagnetic induction heating furnace; spraying a lubricant in a spoke molding mould before forging and pressing; putting the heated bar stock into a lower mould; pushing an upper mould to perform closed extrusion downwards by using a 20MN-hydraulic machine; keeping a pressure for 5 to 10 seconds; ejecting a forge piece out by using a lower ejector rod; expanding the forge piece by putting the forge piece into a small-tonnage press machine; after putting the forge piece into the lower mould of a spinning mould, closely pressing the forge piece on the lower mould; driving the lower mould and the upper mould to rotate integrally at a high speed by using a motor at the bottom of a spinning machine; and spinning three rotating wheels of the spinning machine downwards from the side surface of the forge piece so as to finish hub molding of the forge piece. The method has the characteristics of low tonnage of required equipment, less forging processes, low energy consumption, low forge piece cost and long mould service life.

Description

A kind of processing method of aluminium alloy wheel hub
Technical field the present invention relates to the forming method of a kind of method of metal forming, particularly wheel hub.
The background technology aluminium alloy wheel hub is the vitals on the car, because the importance of its geometric complexity and serviceability, thereby has increased the difficulty of its forging and molding.At present, the conventional process for making of aluminium alloy wheel hub is: it is manufactured materials that the wrought aluminium alloy bar is adopted in (1); (2) the aluminium alloy bar is heated to about 480 ℃; (3) on the forcing press of swaging, carry out preforms; (4) blocking on the 40MN hotdie forging press; (5) finish-forging is shaped on an other 40MN hotdie forging press; (6) enlarging is cut edge on baby press; (7) last mould pressing at the enterprising road wheel rim of spinning machine.Though the aluminium alloy wheel hub that this method is produced has mechanical property preferably, stock utilization can reach 55%, needs expensive large-tonnage hotdie forging press, complex procedures, and energy consumption is big, and the forging cost is high, and the mould load is big, the life-span is low.
Summary of the invention the object of the present invention is to provide that a kind of equipment needed thereby tonnage is low, forging process is few, the processing method of less energy consumption, the forging cost is low, die life is long aluminium alloy wheel hub.The present invention adopts the semi-solid die casting material; Add and man-hour this semisolid bar is carried out the remelting heating, on the 20MN forcing press, carry out forging and molding, the shaping spoke part; On baby press, carry out enlarging again, be shaped at the enterprising road wheel rim of spinning machine then.
Concrete grammar is following:
1, raw material remelting heating: adopt the manufactured materials of semi-solid alloy thixotropic forming bar, and this bar is put into electromagnetic induction heating furnace carry out remelting and be heated to 585 ℃ ± 10 ℃ as aluminium alloy wheel hub.
2, spoke part is shaped:
(1) mould: this spoke mould mainly is made up of Upper Die-sleeve, patrix, upper bolster, last ejector beam, lower die-sleeve, counterdie, die shoe, bottom knockout bar and securing member.Wherein, Upper shed grooved lower die-sleeve bottom is fixed on the die shoe through securing member; Be positioned at the counterdie of above-mentioned grooved lower die-sleeve; Its lower end also is fixed on the die shoe through securing member, in the central through hole of die shoe and counterdie, is provided with the bottom knockout bar in addition, and this counterdie working face is corresponding with wheel hub spoke front and center flange; The limit, upper end of annular Upper Die-sleeve is fixed on the upper bolster through securing member; Be positioned at the patrix of above-mentioned annular Upper Die-sleeve; Its upper end also is fixed on the upper bolster through securing member; In the central through hole of upper bolster and patrix, be provided with ejector beam in addition, this patrix working face is not only corresponding with the wheel hub spoke back side and center flange, and is roughly corresponding with the wheel rim part again simultaneously.
(2) forging and pressing: before the forging and pressing work, upper die and lower die separate, spraying lubricant on die-face; The above-mentioned cylindrical bar that heats is put into counterdie; Promote patrix with 20MN hydraulic press top hydraulic cylinder and carry out Closed Extrusion downwards, and pressurize 5~10 seconds, patrix opened afterwards; By the bottom knockout bar forging is ejected, accomplish the shaping at positive shaping of wheel hub spoke and center flange, the spoke back side and the preform of spoke window position and wheel rim part.
3, enlarging operation: take out above-mentioned forging, put into and accomplish above-mentioned forging enlarging on the enlarging forcing press of little tonnage.
4, mould pressing:
(1) mould: this mould pressing mould mainly is made up of die shoe, counterdie, ejector, backstay, material returned holder and patrix and connecting rod.Wherein, upper shed circular groove shape counterdie bottom links to each other with die shoe through securing member, and the counterdie side is corresponding with the wheel rim shape.The material returned jacking portion corresponding with the counterdie upper shed is provided with the center slotted eye corresponding with wheel hub, the evagination anchor ring that this material returned filler ring shape end face and counterdie end face are formed, and its curvature is corresponding with wheel hub spoke back surface curvature.Be provided with central through hole at above-mentioned die shoe, counterdie middle part; Establish the ejector corresponding in it with it; Vertical backstay lower end links to each other with ejector; The central through hole of material returned holder is passed in the upper end, places in the central through hole of patrix, and this time working face links to each other with connecting rod with its upper end of the positive corresponding patrix of wheel hub spoke.
(2) spinning: upper and lower mould is in released state before the spinning, and after forging was put on the counterdie, last hydraulic cylinder promoted patrix downwards; Forging is pressed on the counterdie, the whole rotation at a high speed of the bottom motor drives upper and lower mould of spinning machine afterwards, 3 spinning rollers of spinning machine spin down from the forging side; The final wheel rim of accomplishing forging is shaped; Upwards promote material returned holder by ejector afterwards, forging is ejected from counterdie, all operation finishes.
The present invention compared with prior art has following advantage:
1, is semi-solid alloy thixotropic forming bar owing to what adopt, has good thixotropy, when the remelting of semisolid bar is heated to about 50% solid rate; When carrying out thixotropic forming again, its deformation force is much little during than solid-state forging, and metal flow property is good; Therefore forging only needs once to forge just and is shaped basically; Simplified forging process, saved material, stock utilization can reach 70%.
2, common relatively solid-state Forging Technology has been saved two operations of prefabricated ring and blocking, has reduced production cost, and since when forging required deformation force little, thereby the service life that can improve mould significantly.
3, the aluminium alloy wheel hub that adopts the inventive method to produce under the T6 condition of heat treatment, has more excellent mechanical property than conventional cast aluminium alloy wheel hub, and can be close with the performance of solid-state reflectal wheel hub.
4, reduce the tonnage of equipment needed thereby, saved the expense of purchasing the large-tonnage hot die forging press, also reduced energy consumption simultaneously.
Description of drawings
Fig. 1 looks generalized section for spoke mould master of the present invention.
Fig. 2 looks generalized section for mould pressing mould master of the present invention.
Fig. 3 a is the three-dimensional forging drawing (front) of aluminium alloy wheel hub of the present invention.
Fig. 3 b is the three-dimensional forging drawing (back side) of aluminium alloy wheel hub of the present invention.
The specific embodiment is calculated the volume of required blank according to the wheel hub part drawing; Choose A356/A357 semi-solid alloy thixotropic forming bar; And this bar is put into electromagnetic induction heating furnace carry out remelting and be heated to 585 ℃ ± 10 ℃, forge and press then spoke part is shaped.This spoke forming mould is as shown in Figure 1; Its upper shed grooved lower die-sleeve 1 bottom is fixed on the die shoe 2 through securing member; Be positioned at the counterdie 3 of above-mentioned grooved lower die-sleeve; Its lower end also is fixed on the die shoe through securing member, in the central through hole of die shoe and counterdie, is provided with bottom knockout bar 4 in addition, and this counterdie working face is corresponding with wheel hub spoke front and center flange; The limit, upper end of annular Upper Die-sleeve 5 is fixed on the upper bolster 6 through securing member; Be positioned at the patrix 7 of above-mentioned annular Upper Die-sleeve; Its upper end also is fixed on the upper bolster through securing member; In the central through hole of upper bolster and patrix, be provided with ejector beam 8 in addition, this patrix working face is not only corresponding with the wheel hub spoke back side and center flange, and is roughly corresponding with the wheel rim part again simultaneously.Before the forging and pressing; Upper die and lower die separate, and on die-face, spray graphitic lubricant, and the cylindrical bar that heats is put into counterdie with the robot gripping; Promote patrix with 20MN hydraulic press top hydraulic cylinder and carry out Closed Extrusion downwards; And pressurize opens patrix after 8 seconds, by the bottom knockout bar forging ejected, and accomplishes shaping and the spoke window position and the wheel rim preform partly at the positive shaping of wheel hub spoke and center flange, the spoke back side.Take out above-mentioned forging by robot again, put into and accomplish the enlarging operation on the enlarging forcing press of the little tonnage of 3.5MN.Carry out mould pressing then, this mould pressing mould is as shown in Figure 2, and its upper shed circular groove shape counterdie 9 bottoms link to each other with die shoe 10 through securing member, and the counterdie side is corresponding with the wheel rim shape.Material returned holder 11 tops corresponding with the counterdie upper shed are provided with the center slotted eye corresponding with wheel hub, the evagination anchor ring that this material returned filler ring shape end face and counterdie end face are formed, and its curvature is corresponding with wheel hub spoke back surface curvature.Be provided with central through hole at above-mentioned die shoe, counterdie middle part; Establish the ejector corresponding 12 in it with it; Vertical backstay 13 lower ends link to each other with ejector; The central through hole upper end that material returned holder is passed on top places in the central through hole of patrix 14, and this time working face links to each other with connecting rod 15 with its upper end of the positive corresponding patrix of wheel hub spoke.Upper and lower mould is in released state before the spinning, and after forging 16 was put on the counterdie, last hydraulic cylinder promoted patrix downwards; Forging is pressed on the counterdie, the whole rotation at a high speed of the bottom motor drives upper and lower mould of spinning machine afterwards, 3 spinning rollers of spinning machine spin down from the forging side; The final wheel rim of accomplishing forging is shaped, and upwards promotes material returned holder by ejector afterwards, and forging is ejected from counterdie; Obtain the aluminium alloy wheel hub forging, as shown in Figure 3.

Claims (1)

1. the processing method of an aluminium alloy wheel hub is characterized in that:
(1) adopts semi-solid alloy thixotropic forming bar as manufactured materials, and this bar is put into electromagnetic induction heating furnace carry out remelting and be heated to 585 ℃ ± 10 ℃;
The above-mentioned bar that (2) will heat is put into the counterdie of spoke mould, promote patrix with the 20MN hydraulic press and carry out Closed Extrusion downwards, and pressurize opens patrix after 5~10 seconds, by the bottom knockout bar forging is ejected;
(3) take out above-mentioned forging, put into and accomplish above-mentioned forging enlarging on the enlarging forcing press of little tonnage;
(4) after being put into above-mentioned forging on the spinning lower mould; Last hydraulic cylinder promotes patrix downwards, forging is pressed on the counterdie the whole rotation at a high speed of the bottom motor drives upper and lower mould of spinning machine afterwards; 3 spinning rollers of spinning machine spin down from the forging side; The final wheel rim of accomplishing forging is shaped, and upwards promotes material returned holder by ejector afterwards, and forging is ejected from counterdie; Its upper shed grooved lower die-sleeve bottom of this spoke mould is fixed on the die shoe through securing member; Be positioned at the counterdie of above-mentioned grooved lower die-sleeve; Its lower end also is fixed on the die shoe through securing member; In the central through hole of die shoe and counterdie, be provided with the bottom knockout bar in addition, this counterdie working face is corresponding with wheel hub spoke front and center flange; The limit, upper end of annular Upper Die-sleeve is fixed on the upper bolster through securing member; Be positioned at the patrix of above-mentioned annular Upper Die-sleeve; Its upper end also is fixed on the upper bolster through securing member; In the central through hole of upper bolster and patrix, be provided with ejector beam in addition, this patrix working face is not only corresponding with the wheel hub spoke back side and center flange, and is roughly corresponding with the wheel rim part again simultaneously; Its upper shed circular groove shape counterdie bottom of this mould pressing mould links to each other with the mould pressing die shoe through securing member; Mould pressing counterdie side is corresponding with the wheel rim shape; The material returned jacking portion corresponding with the upper shed of mould pressing counterdie is provided with the center slotted eye corresponding with wheel hub; The evagination anchor ring that this material returned filler ring shape end face and mould pressing counterdie end face are formed, its curvature is corresponding with wheel hub spoke back surface curvature, is provided with central through hole at mould pressing die shoe, mould pressing counterdie middle part; Establish the ejector corresponding in it with it; Vertical backstay lower end links to each other with ejector, and the central through hole upper end that material returned holder is passed on top places in the central through hole of patrix, and this time working face links to each other with connecting rod with its upper end of the positive corresponding mould pressing patrix of wheel hub spoke.
CN2010102427592A 2010-08-03 2010-08-03 Method for machining aluminum alloy hub Expired - Fee Related CN101912944B (en)

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CN102228951B (en) * 2011-04-26 2012-11-14 哈尔滨哈飞工业有限责任公司 Chambering-forging forming method for aluminum alloy hub with complex structure and die thereof
CN102814621A (en) * 2011-06-07 2012-12-12 韦光东 Automobile hub isothermal forging and spinning forming process
CN102632185A (en) * 2012-01-14 2012-08-15 秦皇岛燕大现代集成制造技术开发有限公司 Magnesium alloy wheel forging forming method and die
CN102744570B (en) * 2012-06-29 2014-07-23 宁波宝通轮业有限公司 Three-step aluminum alloy hub producing method and forging dies and spinning dies used by same
CN103624235A (en) * 2012-08-28 2014-03-12 昆山拓卡自动化设备制造有限公司 Method for manufacturing wheel hub by adopting liquid forging and spinning processes in combined mode
CN102873252B (en) * 2012-09-27 2015-07-15 天津市天锻压力机有限公司 Forging process of large aluminum alloy hub
CN103331575B (en) * 2013-06-07 2015-11-25 南通福乐达汽车配件有限公司 A kind of moulding process of two-way tubular boss wheel hub
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Inventor after: Sun Huixue

Inventor after: Wang Yixiang

Inventor before: Sun Huixue

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Denomination of invention: Method for machining aluminum alloy hub

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Application publication date: 20101215

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