CN110038988A - A kind of medium carbon alloy steel hard disk shell precision forging forming method - Google Patents

A kind of medium carbon alloy steel hard disk shell precision forging forming method Download PDF

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Publication number
CN110038988A
CN110038988A CN201910191465.2A CN201910191465A CN110038988A CN 110038988 A CN110038988 A CN 110038988A CN 201910191465 A CN201910191465 A CN 201910191465A CN 110038988 A CN110038988 A CN 110038988A
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temperature
forging
shell
alloy steel
carbon alloy
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CN201910191465.2A
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Chinese (zh)
Inventor
秦芳诚
齐会萍
亓海全
孟征兵
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Guilin University of Technology
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Guilin University of Technology
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Priority to CN201910191465.2A priority Critical patent/CN110038988A/en
Publication of CN110038988A publication Critical patent/CN110038988A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002—Hybrid process, e.g. forging following casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Forging (AREA)

Abstract

A kind of medium carbon alloy steel hard disk shell precision forging forming method, belongs to box part forging and molding technical field, it is characterised in that comprise the following steps that: 1) casting medium carbon alloy steel prefabricated board billet cast piece using vertical centrifugal casting mode；2) two-step homogenization；3) hot blocking: blank initial temperature is 1150~1200 DEG C, and mold preheating temperature is 380~400 DEG C, and pressure is 34~36MN under press machine, and pushing speed is 3.5~4mm/s；4) hot finish-forging: forging temperature is 1000~1050 DEG C, and mold preheating temperature is 360-380 DEG C, and lower pressure is 37~39MN, and pushing speed is 1.5~2.5mm/s；5) cold closed-die forging: lower pressure is 22~24MN, and pushing speed is 1~2mm/s；6) twin-stage recrystallization annealing.The invention has the advantages that saving material, hard disk shell wall thickness forming limit is big, and outer dimension precision is high, and thermal diffusivity is good.

Description

A kind of medium carbon alloy steel hard disk shell precision forging forming method
Technical field
The invention belongs to box part forging and molding technical fields, and in particular to a kind of medium carbon alloy steel hard disk shell finish forge at Shape method.
Background technique
High-performance medium carbon alloy steel hard disk shell (surrounding wall thickness is 2.5~5.5mm, shell bottom with a thickness of 3~5mm) is large-scale The critical component of desk-top working host, Portable movable hard disk, the hard-disk capacity of mainstream in 6TB hereinafter, revolving speed be 5400~ 7200 revs/min, Shell Manufacture is mainly machine cut processing at present, low pressure casting shapes, 1 fire time Isothermal Hot is swaged into shape, 1 Fiery hot+1 fire time Isothermal Hot forging of blocking, 4~6 fire time hot forging formings, the disadvantage is that material and energy waste are serious, production efficiency Low, equipment tonnage requires height, and the surrounding wall diickness limit is small, there are buckling phenomena, thin-wall regions after hot forging in the height direction Size rebound seriously leads to the reduction of outer dimension precision, and there are shell fever is serious under the conditions of operating when big storage, long The problems such as, seriously reduce its military service performance and used life.When hard disc storage capacity reaches 10TB, revolving speed reach 30,000 revs/min with It when upper, needed to fill inert protective gas in housing chamber, and had both the property requirement of high-strength, high thermal conductivity heat dissipation, high-air-tightness, Requirements at the higher level also proposed therewith to the high-performance manufacture of its shell, existing technology is unable to satisfy the high-performance essence of the shells True figuration manufacture.
Summary of the invention
The purpose of the present invention is to provide a kind of medium carbon alloy steel hard disk shell precision forging forming method, can effectively overcome existing The shortcomings that with the presence of technology.
What the object of the invention was realized in, it is characterised in that comprise the following steps that:
(1) medium carbon alloy steel prefabricated board billet cast piece being cast using vertical centrifugal casting mode, pouring temperature is 1620~ 1660 DEG C, metal die casting mold revolving speed is 180~220r/min, and poring rate is 10~15kg/s, pours slot distance die cap height For 20~30cm, the size of obtained centrifugal casting prefabricated board billet cast piece are as follows: length L0=80~120mm, width W0=30~ 60mm, height H0=10~15mm, surrounding wall thickness B0=5.0~8.5mm, groove depth h0=3~5mm, circular groove radius R0=12~ 30mm；
(2) two-step homogenization: the prefabricated board billet cast piece of centrifugal casting is subjected to Homogenization Treatments, homogenization heating for the first time Temperature is 1150~1200 DEG C, keeps the temperature 6~10h, and second of homogenization is to directly heat to 1250~1280 DEG C, heat preservation 12~ 18h；
(3) hot blocking: blank initial temperature is 1150~1200 DEG C, and mold preheating temperature is 380~400 DEG C, press machine Lower pressure is 34~36MN, and pushing speed is 3.5~4mm/s；
(4) hot finish-forging: forging initial temperature is 1000~1050 DEG C, and mold preheating temperature is 360~380 DEG C, press machine Lower pressure is 37~39MN, and pushing speed is 1.5~2.5mm/s；
(5) cold closed-die forging: pressure is 22~24MN under press machine, and pushing speed is 1~2mm/s, obtains the forging of cold closed-die forging shell Part size are as follows: length L=100~150mm, width W=50~80mm, height H=20~30mm, shell base thickness degree h=3~5mm, Surrounding wall thickness B=2.5~5.5mm, circular groove radius R=18~40mm；
(6) cold closed-die forging Shell Forging Parts twin-stage recrystallization annealing: are subjected to recrystallization annealing processing, first time recrystallization annealing Temperature is 820~850 DEG C, keeps the temperature 1~2h, and second of recrystallization annealing temperature is 860~900 DEG C, keeps the temperature 2~3h, last empty It is cooled to room temperature.
The invention has the advantages and beneficial effects that: material can be substantially saved, the forming limit of shell surrounding wall thickness is big, shell External shape dimensional accuracy is high.Inert protective gas is filled in housing chamber, and to meet, hard disc storage capacity reaches 10TB, revolving speed reaches 3 At ten thousand revs/min or more, high-strength, the high property advantage for leading heat dissipation, high-air-tightness is had both.
Detailed description of the invention
Fig. 1 is vertical centrifugal casting schematic diagram；
Fig. 2 is the top view of vertical centrifugal casting medium carbon alloy steel prefabricated board billet cast piece；
Fig. 3 is A-A cross-sectional view in Fig. 2；
Fig. 4 is the top view of medium carbon alloy steel shell after cold closed-die forging；
Fig. 5 is B-B cross-sectional view in Fig. 4；
In figure: 1-5-die cover plate of casting ladle 2-running channel, 3-cast gate, 4-locking pin 6-upper sand cushion 6 '-descends sand Pad 7-metal die casting mold 8-prefabricated board, 9-cooling water pipe of billet cast piece；
L0The length of-slab, W0The width of-slab, H0The height of-slab, B0The surrounding wall thickness of-slab, h0- plate The depth of groove of base, R0The circular groove radius of-slab, L-Shell Forging Parts length, W-Shell Forging Parts width, H-shell forging The height of part, B-Shell Forging Parts surrounding wall thickness, h-Shell Forging Parts bottom thickness, R-Shell Forging Parts circular groove radius.
Specific embodiment
The present invention is described in further details in the following with reference to the drawings and specific embodiments.
Fig. 4 and Fig. 5 show the top view and B-B cross-sectional view of medium carbon alloy steel shell after cold closed-die forging, i.e., and of the invention one Kind medium carbon alloy steel hard disk shell.
Embodiment 1
The present embodiment provides a kind of medium carbon alloy steel hard disk shell precision forging forming methods, set shell dimension are as follows: length L= 100mm, width W=50mm, height H=20mm, shell base thickness degree h=3mm, surrounding wall thickness B=2.5mm, circular groove radius R= 18mm；The processing step of its precision forging is:
(1) as cast medium carbon alloy steel prefabricated board billet cast piece using vertical centrifugal casting mode, Fig. 1 show vertical centrifugal Schematic diagram is cast, 1 is casting ladle in figure, and 2 be running channel, and 3 be cast gate, and 4 be locking pin, and 5 be die cover plate, and 6 be upper sand cushion, under 6 ' are Sand cushion, 7 be metal die casting mold, and 8 be prefabricated board billet cast piece, and 9 be cooling water pipe, and pouring temperature is 1620 DEG C, metal die casting Type revolving speed is 180r/min, poring rate 10kg/s, and pouring slot distance die cap height is 20cm, obtained centrifugal casting prefabricated board The size of billet cast piece are as follows: length L0=80mm, width W0=30mm, height H0=10mm, surrounding wall thickness B0=5.0mm, groove are deep h0=3mm, circular groove radius R0=12mm, as shown in figures 2-3；
(2) two-step homogenization: carrying out Homogenization Treatments for centrifugal casting prefabricated board billet cast piece, the temperature of homogenization heating for the first time Degree is 1150 DEG C, keeps the temperature 6h, and second of homogenization is to directly heat to 1250 DEG C, keeps the temperature 12h；
(3) hot blocking: blank initial temperature is 1150 DEG C, and mold preheating temperature is 380 DEG C, and pressure is under press machine 34MN, pushing speed are 3.5mm/s；
(4) hot finish-forging: forging initial temperature is 1000 DEG C, and mold preheating temperature is 360 DEG C, and pressure is under press machine 37MN, pushing speed are 1.5mm/s；
(5) cold closed-die forging: pressure is 22MN under press machine, and pushing speed is 1mm/s, obtains cold closed-die forging Shell Forging Parts size Are as follows: length L=100mm, width W=50mm, height H=20mm, shell base thickness degree h=3mm, surrounding wall thickness B=2.5mm, circular groove Radius R=22mm, as shown in Figures 4 and 5；
(6) cold closed-die forging Shell Forging Parts twin-stage recrystallization annealing: are subjected to recrystallization annealing processing, first time recrystallization annealing Temperature is 820 DEG C, keeps the temperature 1h, and second of recrystallization annealing temperature is 860 DEG C, keeps the temperature 2h, is finally air-cooled to room temperature.
Embodiment 2
The present embodiment provides a kind of medium carbon alloy steel hard disk shell precision forging forming methods, set shell dimension are as follows: length L= 150mm, width W=80mm, height H=30mm, shell base thickness degree h=5mm, surrounding wall thickness B=5.5mm, circular groove radius R= 40mm；The processing step of its precision forging is:
(1) as cast medium carbon alloy steel prefabricated board billet cast piece using vertical centrifugal casting mode, Fig. 1 show vertical centrifugal Schematic diagram is cast, 1 is casting ladle in figure, and 2 be running channel, and 3 be cast gate, and 4 be locking pin, and 5 be die cover plate, and 6 be upper sand cushion, under 6 ' are Sand cushion, 7 be metal die casting mold, and 8 be prefabricated board billet cast piece, and 9 be cooling water pipe, and pouring temperature is 1660 DEG C, metal die casting Type revolving speed is 220r/min, poring rate 15kg/s, and pouring slot distance die cap height is 30cm, obtained centrifugal casting prefabricated board The size of billet cast piece are as follows: length L0=120mm, width W0=60mm, height H0=15mm, surrounding wall thickness B0=8.5mm, groove Deep h0=5mm, circular groove radius R0=30mm, as shown in figures 2-3；
(2) two-step homogenization: carrying out Homogenization Treatments for centrifugal casting prefabricated board billet cast piece, the temperature of homogenization heating for the first time Degree is 1200 DEG C, keeps the temperature 10h, and second of homogenization is to directly heat to 1280 DEG C, keeps the temperature 18h；
(3) hot blocking: blank initial temperature is 1200 DEG C, and mold preheating temperature is 400 DEG C, and pressure is under press machine 36MN, pushing speed are 4mm/s；
(4) hot finish-forging: forging initial temperature is 1050 DEG C, and mold preheating temperature is 380 DEG C, and pressure is under press machine 39MN, pushing speed are 2.5mm/s；
(5) cold closed-die forging: pressure is 24MN under press machine, and pushing speed is 2mm/s, obtains cold closed-die forging Shell Forging Parts size Are as follows: length L=150mm, width W=80mm, height H=30mm, shell base thickness degree h=5mm, surrounding wall thickness B=5.5mm, circular groove Radius R=40mm, as shown in Figures 4 and 5；
(6) cold closed-die forging Shell Forging Parts twin-stage recrystallization annealing: are subjected to recrystallization annealing processing, first time recrystallization annealing Temperature is 850 DEG C, keeps the temperature 2h, and second of recrystallization annealing temperature is 900 DEG C, keeps the temperature 3h, is finally air-cooled to room temperature.
Embodiment 3
The present embodiment provides a kind of medium carbon alloy steel hard disk shell precision forging forming methods, set shell dimension are as follows: length L= 120mm, width W=60mm, height H=25mm, shell base thickness degree h=4mm, surrounding wall thickness B=4.0mm, circular groove radius R= 25mm；The processing step of its precision forging is:
(1) as cast medium carbon alloy steel prefabricated board billet cast piece using vertical centrifugal casting mode, Fig. 1 show vertical centrifugal Schematic diagram is cast, 1 is casting ladle in figure, and 2 be running channel, and 3 be cast gate, and 4 be locking pin, and 5 be die cover plate, and 6 be upper sand cushion, under 6 ' are Sand cushion, 7 be metal die casting mold, and 8 be prefabricated board billet cast piece, and 9 be cooling water pipe, and pouring temperature is 1640 DEG C, metal die casting Type revolving speed is 200r/min, poring rate 12kg/s, and pouring slot distance die cap height is 25cm, obtained centrifugal casting prefabricated board The size of billet cast piece are as follows: length L0=100mm, width W0=50mm, height H0=12mm, surrounding wall thickness B0=6.5mm, groove Deep h0=4mm, circular groove radius R0=20mm, as shown in figures 2-3；
(2) two-step homogenization: carrying out Homogenization Treatments for centrifugal casting prefabricated board billet cast piece, the temperature of homogenization heating for the first time Degree is 1180 DEG C, keeps the temperature 8h, and second of homogenization is to directly heat to 1270 DEG C, keeps the temperature 15h；
(3) hot blocking: blank initial temperature is 1170 DEG C, and mold preheating temperature is 390 DEG C, and pressure is under press machine 35MN, pushing speed are 3.8mm/s；
(4) hot finish-forging: forging initial temperature is 1020 DEG C, and mold preheating temperature is 370 DEG C, and pressure is under press machine 38MN, pushing speed are 2.0mm/s；
(5) cold closed-die forging: pressure is 22MN under press machine, and pushing speed is 1mm/s, obtains cold closed-die forging Shell Forging Parts size Are as follows: length L=120mm, width W=60mm, height H=25mm, shell base thickness degree h=4mm, surrounding wall thickness B=4.0mm, circular groove Radius R=25mm, as shown in Figures 4 and 5；
(6) cold closed-die forging Shell Forging Parts twin-stage recrystallization annealing: are subjected to recrystallization annealing processing, first time recrystallization annealing Temperature is 830 DEG C, keeps the temperature 1.5h, and second of recrystallization annealing temperature is 870 DEG C, keeps the temperature 2.5h, is finally air-cooled to room temperature.

Claims (1)

1. a kind of medium carbon alloy steel hard disk shell precision forging forming method, it is characterised in that realize in following processing steps:
(1) vertical centrifugal casting mode is used to cast medium carbon alloy steel prefabricated board billet cast piece: pouring temperature for 1620~1660 DEG C, Metal die casting mold revolving speed be 180~220r/min, poring rate be 10~15kg/s, pour slot distance die cap height be 20~ 30cm, the size of obtained centrifugal casting prefabricated board billet cast piece are as follows: length L0=80~120mm, width W0=30~60mm, height Spend H0=10~15mm, surrounding wall thickness B0=5.0~8.5mm, groove depth h0=3~5mm, circular groove radius R0=12~30mm；
(2) two-step homogenization: the prefabricated board billet cast piece of centrifugal casting is subjected to Homogenization Treatments, homogenizes heating temperature for the first time It is 1150~1200 DEG C, keeps the temperature 6~10h, second of homogenization is to directly heat to 1250~1280 DEG C, keeps the temperature 12~18h；
(3) hot blocking: blank initial temperature is 1150~1200 DEG C, and mold preheating temperature is 380~400 DEG C, and press machine pushes Power is 34~36MN, and pushing speed is 3.5~4mm/s；
(4) hot finish-forging: forging initial temperature is 1000~1050 DEG C, and mold preheating temperature is 360~380 DEG C, and press machine pushes Power is 37~39MN, and pushing speed is 1.5~2.5mm/s；
(5) cold closed-die forging: pressure is 22~24MN under press machine, and pushing speed is 1~2mm/s, obtains cold closed-die forging Shell Forging Parts ruler It is very little are as follows: length L=100~150mm, width W=50~80mm, height H=20~30mm, shell base thickness degree h=3~5mm, surrounding Wall thickness B=2.5~5.5mm, circular groove radius R=18~40mm；
(6) cold closed-die forging Shell Forging Parts twin-stage recrystallization annealing: are subjected to recrystallization annealing processing, first time recrystallization annealing temperature It is 820~850 DEG C, keeps the temperature 1~2h, second of recrystallization annealing temperature is 860~900 DEG C, keeps the temperature 2~3h, is finally air-cooled to Room temperature.
CN201910191465.2A 2019-03-14 2019-03-14 A kind of medium carbon alloy steel hard disk shell precision forging forming method Withdrawn CN110038988A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1807660A (en) * 2006-02-09 2006-07-26 沈阳黎明航空发动机(集团)有限责任公司 GH696 alloy vane ausform forming process
CN101709365A (en) * 2009-11-13 2010-05-19 中原特钢股份有限公司 Heating processing process in production of high -carbon chromium bearing steel
CN103409700B (en) * 2013-07-13 2016-02-03 瞿立双 For Preparation technology of alloy steel of train buffer
CN107236903A (en) * 2017-06-28 2017-10-10 安徽华飞机械铸锻有限公司 A kind of casting technique of alloy steel casting
KR20170136040A (en) * 2016-05-30 2017-12-11 공주대학교 산학협력단 Method for preparing precision metallic parts using compound forging and precision metallic parts prepared thereby

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1807660A (en) * 2006-02-09 2006-07-26 沈阳黎明航空发动机(集团)有限责任公司 GH696 alloy vane ausform forming process
CN101709365A (en) * 2009-11-13 2010-05-19 中原特钢股份有限公司 Heating processing process in production of high -carbon chromium bearing steel
CN103409700B (en) * 2013-07-13 2016-02-03 瞿立双 For Preparation technology of alloy steel of train buffer
KR20170136040A (en) * 2016-05-30 2017-12-11 공주대학교 산학협력단 Method for preparing precision metallic parts using compound forging and precision metallic parts prepared thereby
CN107236903A (en) * 2017-06-28 2017-10-10 安徽华飞机械铸锻有限公司 A kind of casting technique of alloy steel casting

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