CN101480691B - Hot forging method of magnesium alloy straight bevel gear - Google Patents

Hot forging method of magnesium alloy straight bevel gear Download PDF

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Publication number
CN101480691B
CN101480691B CN2009100450695A CN200910045069A CN101480691B CN 101480691 B CN101480691 B CN 101480691B CN 2009100450695 A CN2009100450695 A CN 2009100450695A CN 200910045069 A CN200910045069 A CN 200910045069A CN 101480691 B CN101480691 B CN 101480691B
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China
Prior art keywords
forging
blank
finish
magnesium alloy
die
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CN2009100450695A
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Chinese (zh)
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CN101480691A (en
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刘娟
崔振山
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上海交通大学
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Abstract

The invention relates to a method for hot-forging a magnesium alloy straight bevel gear, which belongs to the technical field of the forging and comprises the following steps: materials are prepared, an upper die cavity and a lower die cavity of a pre-forging die are heated, and the temperature of the die is maintained at 200-275 DEG C; a blank is heated to 300-350 DEG C; the blank is put into the pre-forging die for pre-forging forming so as to obtain a toothless pre-forging piece; an upper die cavity and a lower die cavity of a finish forging die are heated, and the temperature of the die is maintained at 200-265 DEG C; the pre-forging piece is heated to 290-340 DEG C; the blank is put into the finish forging die for finish-forging forming, and a finish forging piece is obtained. In the method, the blank and the die are heated so that the blank in a constant-temperature die is forged into a product, thereby a part with complex shape can have better filling performance, excellent shape and precision, good mechanism property, and the like.

Description

Hot forging method of magnesium alloy straight bevel gear
Technical field
What the present invention relates to is a kind of hot forging method of technical field of forging, particularly a kind of hot forging method of magnesium alloy straight bevel gear.
Background technology
Magnesium alloy is present the lightest applicable structural metallic materials, has low density, high specific strength and specific stiffness, good damping shock absorption, thermal conductivity, electromagnetic wave shielding and machinability, and accessory size is stable, easily recovery, has broad application prospects in industries such as Aero-Space, automobile, electronics, computer, communication and household electrical appliances.But as industrial light metal material, magnesium alloy was used in the narrower field such as aircraft industry in the past, and with respect to aluminium alloy and plastics, the use amount of magnesium alloy is quite few.Global Greenhouse Effect has caused automobile to develop towards the lightweight direction, and magnesium alloy acutely increases the demand of magnesium alloy parts as the position of the substitution material of steel and aluminium alloy.But current magnesium-alloy material is with foundry goods, and particularly die casting is in the majority, and plastic process product is few.This mainly is the crystal structure that has close-packed hexagonal owing to magnesium alloy, and the thick and surface oxidation of crystal grain easily takes place again under the high temperature plastic deformation poor performance at room temperature.Because the mechanical property of foundry goods is relatively poor, easily produce defective, and by comparison, wrought magnesium alloy organize tiny evenly, comprehensive mechanical performance is good.At present, in the research of magnesium alloy plastic forming technology, because magnesium alloy is to temperature and strain hardening and strain-rate sensitivity, metal flow is poor, and the difficulty of forging is bigger, does not especially appear in the newspapers for magnesium alloy complicated shape part forging and molding.
Find that through literature search little slope field etc. are at " International Journal ofMachine Tools ﹠amp to prior art; Manufacture " " Forming limit of magnesium alloy at elevated temperaturesfor precision forging " (the magnesium alloy high temperature precision forging limit) delivered on (International Machine Tool with make magazine) (2002 the 42nd phase 607-614 pages or leaves), be 24mm by diameter in this article, it highly is the upsetting formation experiment of the magnesium alloy ZK60 of 36mm, obtained as drawing a conclusion: can rupture below 200 ℃, more than 400 ℃ oxidation takes place, only finish forge temperature is 300 ℃.Its research only is to carry out the hot compression experiment for simple cylindrical blank, does not relate to the die forging machinability research of complicated shape part.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of hot forging method of magnesium alloy straight bevel gear is proposed, make magnesium alloy complicated shape part have good filling property, good shape and sperm quality, favorable rigidity and toughness, in light weight and intensity is big.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
Step 1, blanking: this blank is the magnesium alloy extrusion blank with predetermined;
Step 2, heating blocking mould: the upper and lower impression to the blocking mould heats, and makes mold temperature maintain 200~275 ℃;
Step 3, heating blank: make this blank heating to 300~350 ℃;
Step 4, blocking are shaped: blank is inserted in the blocking mould, carry out blocking and be shaped, obtain not having the pre-forging of profile of tooth;
Step 5, heating finish-forging mould: the upper and lower impression to the finish-forging mould heats, and makes mold temperature maintain 200~265 ℃;
Step 6, heat pre-forging: pre-forging is heated to 290~340 ℃;
Step 7, finish-forging are shaped: blank is inserted in the finish-forging mould, carry out finish-forging and be shaped, obtain finish-forging spare.
Be equipped with electric heater unit and attemperating unit on the described mould, be used to heat and temperature control.
The speed that described blocking is shaped and finish-forging is shaped is 0.5~2mm/s.
In the prior art since magnesium alloy to temperature and strain hardening and strain-rate sensitivity, metal flow is poor, the difficulty of forging is bigger, especially for magnesium alloy complicated shape part forging and molding.The present invention is in order to address these problems, adopt technique scheme, heat at blank and mould, make blank in the isothermal mould, forge goods, make magnesium alloy complicated shape part straight-tooth forge gear and have good filling property, good shape and precision, favorable rigidity and toughness, in light weight and intensity is big.The present invention is simple to operate, is convenient to implement and use.
The specific embodiment
Below embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
The magnesium alloy that present embodiment is selected for use is AZ31B, and the step of thermal forging technology includes:
One, blanking: this blank is the magnesium alloy extrusion blank, the principle that the producer can equate according to molded article shape and forging drawing volume, and with 3D sculpting software accurate Calculation in addition, size that can this blank.
Two, heating blocker: mold preheating temperature is 275 ℃.Use two power as the resistance heated circle of 800W to blocker heating up and down because heat conduction and thermal-radiating influence, required time of mold heated is longer, is about 3~3.5 hours.
Three, heating blank: directly blank is put into heating furnace, be preheating to 120 ℃ earlier, put into the aqueous graphite lubricant again and soak, taking-up is dried.Furnace temperature is set to 350 ℃ then, puts into the blank after lubricating, be heated to design temperature and be incubated 15 minutes, eliminate the thermograde in the blank.
Four, blocking is shaped: carry out blocking processing with the constant speed of 2mm/s, obtain not having the pre-forging of profile of tooth.
Five, heating finisher: the finisher heating-up temperature is 265 ℃.Same use two power finish impression up and down to be heated as the resistance heated circle of 800W.Because heat conduction and thermal-radiating influence, required time of mold heated is longer, is about 2.5~3 hours.
Six, heat pre-forging: equally pre-forging is put into heating furnace, be preheating to 150 ℃ earlier, put into aqueous graphite again and soak, taking-up is dried.Blank heating to 340 after will lubricating then ℃ also is incubated 15 minutes.
Seven, finish-forging is shaped: carry out blocking processing with the constant speed of 2mm/s, the rapid water-cooled in distortion back is to preserve high temperature microstructure.
Magnesium alloy straight bevel gear profile of tooth that present embodiment obtains is filled good, and is in light weight and intensity is big.
Embodiment 2
The magnesium alloy that present embodiment is selected for use is AZ31B, and the step of thermal forging technology includes:
One, blanking: this blank is the magnesium alloy extrusion blank, the principle that the producer can equate according to molded article shape and forging drawing volume, and with 3D sculpting software accurate Calculation in addition, size that can this blank.
Two, heating blocker: mold preheating temperature is 240 ℃.Use two power as the resistance heated circle of 800W to blocker heating up and down because heat conduction and thermal-radiating influence, required time of mold heated is longer, is about 2~2.5 hours.
Three, heating blank: directly blank is put into heating furnace, be preheating to 150 ℃ earlier, put into the aqueous graphite lubricant again and soak, taking-up is dried.Furnace temperature is set to 325 ℃ then, puts into the blank after lubricating, be heated to design temperature and be incubated 15 minutes, eliminate the thermograde in the blank.
Four, blocking is shaped: carry out blocking processing with the constant speed of 1mm/s, obtain not having the pre-forging of profile of tooth.
Five, heating finisher: the finisher heating-up temperature is 235 ℃.Same use two power finish impression up and down to be heated as the resistance heated circle of 800W.Because heat conduction and thermal-radiating influence, required time of mold heated is longer, is about 2~2.5 hours.
Six, heat pre-forging: equally pre-forging is put into heating furnace, be preheating to 135 ℃ earlier, put into aqueous graphite again and soak, taking-up is dried.Blank heating to 315 after will lubricating then ℃ also is incubated 15 minutes.
Seven, finish-forging is shaped: carry out blocking processing with the constant speed of 1mm/s, the rapid water-cooled in distortion back is to preserve high temperature microstructure.
Magnesium alloy straight bevel gear profile of tooth that present embodiment obtains is filled good, and is in light weight and intensity is big.
Embodiment 3
The magnesium alloy that present embodiment is selected for use is AZ31B, and the step of thermal forging technology includes:
One, blanking: this blank is the magnesium alloy extrusion blank, the principle that the producer can equate according to molded article shape and forging drawing volume, and with 3D sculpting software accurate Calculation in addition, size that can this blank.
Two, heating blocker: mold preheating temperature is 200 ℃.Use two power as the resistance heated circle of 800W to blocker heating up and down because heat conduction and thermal-radiating influence, required time of mold heated is longer, is about 1.5~2 hours.
Three, heating blank: directly blank is put into heating furnace, be preheating to 120 ℃ earlier, put into the aqueous graphite lubricant again and soak, taking-up is dried.Furnace temperature is set to 300 ℃ then, puts into the blank after lubricating, be heated to design temperature and be incubated 15 minutes, eliminate the thermograde in the blank.
Four, blocking is shaped: carry out blocking processing with the constant speed of 0.5mm/s, obtain not having the pre-forging of profile of tooth.
Five, heating finisher: the finisher heating-up temperature is 200 ℃.Same use two power finish impression up and down to be heated as the resistance heated circle of 800W.Because heat conduction and thermal-radiating influence, required time of mold heated is longer, is about 1.5~2 hours.
Six, heat pre-forging: equally pre-forging is put into heating furnace, be preheating to 135 ℃ earlier, put into aqueous graphite again and soak, taking-up is dried.Blank heating to 290 after will lubricating then ℃ also is incubated 15 minutes.
Seven, finish-forging is shaped: carry out blocking processing with the constant speed of 0.5mm/s, the rapid water-cooled in distortion back is to preserve high temperature microstructure.
Magnesium alloy straight bevel gear profile of tooth that present embodiment obtains is filled good, and is in light weight and intensity is big.

Claims (1)

1. hot forging method of magnesium alloy straight bevel gear is characterized in that may further comprise the steps:
Step 1, blanking: adopt to have the magnesium alloy extrusion blank of predetermined as blank;
Step 2, heating blocking mould: the upper and lower impression to the blocking mould heats, and makes mold temperature maintain 200 ℃~275 ℃;
Step 3, heating blank: this blank heating to 300 ℃~350 ℃;
Step 4, blocking are shaped: blank is inserted in the blocking mould, carry out blocking and be shaped, obtain not having the pre-forging of profile of tooth;
Step 5, heating finish-forging mould: the upper and lower impression to the finish-forging mould heats, and makes mold temperature maintain 200 ℃~265 ℃;
Step 6, heat pre-forging: pre-forging is heated to 290 ℃~340 ℃;
Step 7, finish-forging are shaped: pre-forging is inserted in the finish-forging mould, carry out finish-forging and be shaped, obtain finish-forging spare;
Be equipped with electric heater unit and attemperating unit on described blocking mould and the finish-forging mould;
The speed that described blocking is shaped and finish-forging is shaped is 0.5~2mm/s.
CN2009100450695A 2009-01-08 2009-01-08 Hot forging method of magnesium alloy straight bevel gear CN101480691B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN2009100450695A CN101480691B (en) 2009-01-08 2009-01-08 Hot forging method of magnesium alloy straight bevel gear

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CN101480691A CN101480691A (en) 2009-07-15
CN101480691B true CN101480691B (en) 2010-09-22

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101856722B (en) * 2010-06-22 2011-08-03 黑龙江省机械科学研究院 Method for manufacturing nano-crystal magnesium alloy powder gear
CN102581208B (en) * 2012-02-21 2015-05-20 中国农业大学 Method for precisely carrying out hot forging on driven spiral bevel gear of automobile rear axle
CN104707927B (en) * 2013-12-12 2016-09-14 陕西宏远航空锻造有限责任公司 A kind of improve variable cross-section aluminum alloy die forgings tissue and the hot-working method of performance
CN103691859B (en) * 2013-12-15 2016-05-25 无锡透平叶片有限公司 A kind of die-forging forming method of mount pad
CN105014329A (en) * 2014-08-14 2015-11-04 苏州优金金属成型科技有限公司 Machining method for bevel gear for automobile
CN105690037B (en) * 2016-03-12 2018-06-12 洛阳华冠齿轮股份有限公司 A kind of near-net-shape method of differential spider, axle shaft gear red copper electrode tooth form
CN105921672B (en) * 2016-05-17 2017-12-05 山东大学 A kind of method of the isothermal forging of straight bevel gear
CN107042273B (en) * 2017-05-23 2019-01-29 武汉理工大学 Hot forging forming mold and hot forging forming technique for non-circular bevel gear

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