CN104419813A - Heat treatment process of spring clamp head - Google Patents

Heat treatment process of spring clamp head Download PDF

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Publication number
CN104419813A
CN104419813A CN201310391888.1A CN201310391888A CN104419813A CN 104419813 A CN104419813 A CN 104419813A CN 201310391888 A CN201310391888 A CN 201310391888A CN 104419813 A CN104419813 A CN 104419813A
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CN
China
Prior art keywords
tempering
stage
time
quenching
temperaturetempering
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201310391888.1A
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Chinese (zh)
Inventor
张淑华
Original Assignee
张淑华
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 张淑华 filed Critical 张淑华
Priority to CN201310391888.1A priority Critical patent/CN104419813A/en
Publication of CN104419813A publication Critical patent/CN104419813A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/02Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs

Abstract

The invention relates to a heat treatment process of a spring clamp head. The heat treatment process of the spring clamp head is characterized by comprising the following steps: rough machining; quenching and tempering at low temperature; finish machining; and molding and tempering. The spring clamp head processed by the heat treatment process has the advantages of being moderate in hardness, good in elasticity, hard to bend and high in working performance of parts; the service life of the clamp is prolonged.

Description

A kind of thermal treatment process of spring collet
Technical field
What the present invention relates to is thermal treatment process, and what be specifically related to is a kind of thermal treatment process of spring collet.
Technical background
Spring collet is due to its structure special (wall thickness variation is large), and use properties requires higher, and different to each several part performance requriements.As: to head (i.e. working portion), require to have enough hardness and wear resistance, hardness is generally 58-63HRC.This part cylindrical (or endoporus) is in coniform, and wall thickness is generally thicker.Therefore heat treatment requirements mainly ensures its hardness and wear resistance, if thermal treatment is improper, its service precision and life-span will be had a strong impact on.Require to have higher elasticity and suitable toughness to elastic part, hardness is about 40 ~ 45HRC, and require in a free state can free swell or reduce 0.1 ~ 0.3mm.This part wall thickness is thinner, is generally about 1 ~ 3mm.Therefore be the critical process of spring collet to the thermal treatment of elastic part, and be the skill difficult point of this kind of part.If dealt with improperly, following three kinds of situations may be there are: one is that hardness is too low, poor flexibility, loses the use properties of spring collet; Two is much higher hard, manipulation effort; Three is occur fragility, frangibility.
Summary of the invention
For the problems referred to above, the thermal treatment process providing a kind of spring collet of the present invention, ensure that the use properties of each several part, extends the work-ing life of fixture.
A thermal treatment process for spring collet, is characterized in that, treatment process divide roughing stage-quenching, low-temperaturetempering-finishing stage-sizing tempering four-stage, concrete treatment process is as follows:
(1) roughing stage-car goes out each portion shape, outer, inner conical surface, work inside and outside periphery, and guide part grades, and mills out multiple elastic groove and can not milling lead to;
(2) quenching, low-temperaturetempering-carry out preheating with the speed of 2min/mm at 400 ~ 450 DEG C of temperature, be then heated to 840 ~ 850 DEG C in salt bath furnace, after cooling thoroughly, finally in 160 DEG C of oil ovens, and tempering time 2h, then cleaning, air cooling;
(3) finishing stage-mill outer, inner conical surface and inside and outside footpath of work and guide part is outer, internal diameter to size, cut logical elastic groove;
(4) tempering-first of the shaping collar of shaping on head cover is shaped, and rapid heating in the salt bath then afterbody and elastic portion being placed in turn 840 ~ 845 DEG C, the time is about 3 ~ 4s, takes off the sizing collar again after for some time to be cooled.
Described quenching, the heat-processed of low-temperaturetempering are first inserted in liquid by head, after held for some time, more all inserts in liquid, be incubated with 30s/mm.
Described sizing drawing process, the shaping size of internal withdraw type should about 1.5 mms larger than working size, and external-expanding type then should little about 1.5mm.
Advantage of the present invention: hardness is moderate, good springiness, not easy to break, the favorable working performance of each several part, extends the work-ing life of fixture.
Embodiment
Embodiment (1) the roughing stage
Car goes out each portion shape, and outer (interior) conical surface, (outward) periphery in work, guide part grades, and mills out all elastic groove.
(2) first stage thermal treatment---quenching, low-temperaturetempering
1. preheating carries out preheating with the speed of 2min/mm at 400 ~ 450 DEG C of temperature.When this operation mainly considers that complex-shaped steel alloy heats in salt bath furnace, the thermal stresses in heat-processed has to cause is out of shape and cracking
Danger.
2. heat and be heated to 840 ~ 850 DEG C (first head is inserted in liquid, after held for some time, more all insert in liquid, be incubated with 30s/mm) in salt bath furnace.This operation mainly consider control due to wall thickness not
Evenly cause heat distortion, therefore adopt staged heating method.
3. cooling in No. 10 machine oil is cooled saturating.Metallographic structure after quenching is cryptocrystalline martensite, carbide and residual austenite.
4. overall tempering, in 160 DEG C of oil ovens, tempering time 2h, then cleaning, air cooling.Metallographic structure after low-temperaturetempering is tempered martensite, equally distributed fine-grannular carbide and a small amount of residual austenite.Hardness is 60 ~ 65HRC.
(3) finishing stage
In outer (interior) conical surface of mill, work, (outward) footpath and outer (interior) footpath of guide part are to size; Cut logical elastic groove.
(4) subordinate phase thermal treatment---sizing tempering
1. shape to shape on head cover the collar (shaping size of internal withdraw type should than working size large about 1.5 mm, external-expanding type then should little about 1.5mm).
2. heat afterbody and elastic portion be placed in turn 840 ~ 845 DEG C salt bath in rapid heating, the time is about 3 ~ 4s.Because tempering temperature is very high, the time is slightly grown and just may reduce head hardness, too short, makes elastic portion not obtain desired properties.
3. cleaning, air cooling take off the sizing collar after for some time to be cooled again.
Sizing tempering after, head tissue is constant, and hardness is 58 ~ 63HRC, elastic portion be organized as tempering troostite, hardness is 40 ~ 45 HRC, and is provided with higher elastic limit and yield strength.

Claims (3)

1. a thermal treatment process for spring collet, is characterized in that, treatment process divide roughing stage-quenching, low-temperaturetempering-finishing stage-sizing tempering four-stage, concrete treatment process is as follows:
(1) roughing stage-car goes out each portion shape, outer, inner conical surface, work inside and outside periphery, and guide part grades, and mills out multiple elastic groove and can not milling lead to;
(2) quenching, low-temperaturetempering-carry out preheating with the speed of 2min/mm at 400 ~ 450 DEG C of temperature, be then heated to 840 ~ 850 DEG C in salt bath furnace, after cooling thoroughly, finally in 160 DEG C of oil ovens, and tempering time 2h, then cleaning, air cooling;
(3) finishing stage-mill outer, inner conical surface and inside and outside footpath of work and guide part is outer, internal diameter to size, cut logical elastic groove;
(4) tempering-first of the shaping collar of shaping on head cover is shaped, and rapid heating in the salt bath then afterbody and elastic portion being placed in turn 840 ~ 845 DEG C, the time is about 3 ~ 4s, takes off the sizing collar again after for some time to be cooled.
2. the thermal treatment process of a kind of spring collet according to claim 1, is characterized in that, described quenching, the heat-processed of low-temperaturetempering are first inserted in liquid by head, after held for some time, more all inserts in liquid, be incubated with 30s/mm.
3. the thermal treatment process of a kind of spring collet according to claim 1, is characterized in that, described sizing drawing process, and the shaping size of internal withdraw type should about 1.5 mms larger than working size, and external-expanding type then should little about 1.5mm.
CN201310391888.1A 2013-09-02 2013-09-02 Heat treatment process of spring clamp head Pending CN104419813A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310391888.1A CN104419813A (en) 2013-09-02 2013-09-02 Heat treatment process of spring clamp head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310391888.1A CN104419813A (en) 2013-09-02 2013-09-02 Heat treatment process of spring clamp head

Publications (1)

Publication Number Publication Date
CN104419813A true CN104419813A (en) 2015-03-18

Family

ID=52969932

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310391888.1A Pending CN104419813A (en) 2013-09-02 2013-09-02 Heat treatment process of spring clamp head

Country Status (1)

Country Link
CN (1) CN104419813A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106180374A (en) * 2016-07-13 2016-12-07 苏州市虎丘区浒墅关弹簧厂 The preparation method of carbon wavy spring in a kind of high-quality
CN109593923A (en) * 2019-01-16 2019-04-09 杭州骏马轴承有限公司 A kind of bearing ring external-expanding type spring perch heat treatment operation method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106180374A (en) * 2016-07-13 2016-12-07 苏州市虎丘区浒墅关弹簧厂 The preparation method of carbon wavy spring in a kind of high-quality
CN109593923A (en) * 2019-01-16 2019-04-09 杭州骏马轴承有限公司 A kind of bearing ring external-expanding type spring perch heat treatment operation method

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Application publication date: 20150318