CN104651595A - Thermal treatment method for motor shaft - Google Patents
Thermal treatment method for motor shaft Download PDFInfo
- Publication number
- CN104651595A CN104651595A CN201510056367.XA CN201510056367A CN104651595A CN 104651595 A CN104651595 A CN 104651595A CN 201510056367 A CN201510056367 A CN 201510056367A CN 104651595 A CN104651595 A CN 104651595A
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- CN
- China
- Prior art keywords
- motor shaft
- heat treating
- treating method
- quenching
- heated
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Classifications
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
Abstract
The invention discloses a thermal treatment method for a motor shaft. The thermal treatment method comprises the following steps: (1) performing normalization treatment, namely, putting the motor shaft into a heating device, heating and keeping the temperature, and naturally cooling; (2) performing thermal refining treatment, namely, putting the motor shaft into the heating device, heating and keeping the temperature, subsequently performing oil quenching cooling, putting the motor shaft into the heating device, heating, increasing the temperature, keeping the temperature, and naturally cooling; (3) performing medium-frequency sensitive quenching treatment, namely, sleeving the motor shaft with the sensing coil of a quenching sensor, thereby enabling the sensing coil to instantaneously heat the motor shaft and simultaneously spray a quenching medium to the surface of the heated motor shaft in the moving process; (4) performing low-temperature annealing treatment, namely, putting the motor shaft into the heating device, heating and keeping the temperature. The invention aims to overcome the defects of the prior art and provides a motor shaft thermal treatment method that the motor shaft is relatively high in strength and the fatigue service life of the motor shaft is effectively prolonged.
Description
Technical field
The invention belongs to electric machine part Field of Heat-treatment, be specifically related to a kind of motor shaft heat treating method optimizing thermal treatment process and parameter thereof.
Background technology:
Manufacturing and designing in work at non-standard equipment, for meeting special operation condition requirement, using medium carbon steel or medium carbon alloy steel to machined the high pulling torque splined shaft be applied in hybrid power automobile drive electric motor.And in actual application in process, motor shaft is immature due to thermal treatment process, the problem such as easy recurring structure distortion, crackle, even fracture, therefore the thermal treatment process of traditional motor shaft and parameter need to be optimized design.
Summary of the invention:
The object of the invention is to overcome deficiency of the prior art, one is provided to optimize motor shaft thermal treatment process and parameter, and can ensure that motor shaft spline root and transition arc position have complete quench-hardened case, make area of stress concentration have larger intensity, effectively extend the motor shaft thermal treatment process of the fatigue lifetime of motor shaft.
Technical scheme of the present invention is: comprise the following steps:
(1) normalizing treatment: the motor shaft of forging molding is placed in heating unit, is heated to 850 DEG C to 900 DEG C, and keeps 1.5 little of 2.5 hours, then puts row naturally cooling into motor shaft;
(2) modifier treatment: motor shaft is placed in heating unit again, be heated to 850 DEG C to 900 DEG C, and keep 1.5 little of 2.5 hours, then motor shaft being placed into starting temperature is carry out oil quenching cooling process in the fluid of 60 DEG C to 80 DEG C, make motor shaft temperature be down to martensitic transformation end temp, and then motor shaft is placed in heating unit, be heated to 500 DEG C to 650 DEG C, and keep 1.5 little of 2.5 hours, then naturally cooling is carried out to motor shaft;
(3) mid-frequency induction hardening process: by motor shaft sleeve in the induction coil of quenching inducer, induction coil moves to the other end from motor shaft one end, translational speed is 2mm/s to 3mm/s, induction frequencies is 2500Hz to 8000Hz,, induction coil instantaneously heating motor shaft simultaneously to by the motor shaft surface spraying quenchant heated in moving process;
(4) low-temperaturetempering process: motor shaft is placed in heating unit, is heated to 160 DEG C to 200 DEG C, and keeps 1.5 little of 2.5 hours.
Motor shaft is preferably medium carbon steel and medium carbon alloy steel material, the tooth depth of its spline teeth portion is 5mm-10mm, is applicable to the motor shaft that power is 80Kw to 100Kw motor.
Naturally cooling is in the air of motor shaft in physical environment and cools.
Heating unit is preferably resistance furnace.
Martensitic transformation end temp in modifier treatment is 190 DEG C to 210 DEG C.
Quenchant in mid-frequency induction hardening process is preferably water-based emulsion liquid.
In mid-frequency induction hardening process, the output rating of induction quenching device is 30Kw to 70Kw, and induction frequencies is preferably 4000Hz to 8000Hz.
Mid-frequency induction hardening process need be the quench-hardened case of 2.5mm-3.5mm at the formation thickness of the bottom of the teeth groove of the spline of motor shaft after quenching.
Compared to traditional motor shaft heat treating method, the present invention has significant advantage and beneficial effect, is embodied as:
(1) motor shaft heat treating method of the present invention, optimizes the temperature and time parameter of normalizing treatment, can serve the effect of refinement motor shaft crystal grain, and the lifting of grain refining to subsequent heat treatment quality is laid a good foundation.
(2) motor shaft heat treating method of the present invention, carries out Surface heat-treatent to axis body repeated load force side, and while making piece surface have high-intensity performance, heart portion keeps certain toughness.
(3) motor shaft heat treating method of the present invention, after changing heat treatment process parameter, ensures that spline root and transition arc position have complete quench-hardened case, makes area of stress concentration have larger intensity, effectively extend the fatigue lifetime of part.
(4) the instrument and supplies method needed for motor shaft heat treating method of the present invention to realize cost low, good economy performance, and heat treatment step is simple to operation, is easy to apply in actual activity in production.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of motor shaft heat treating method of the present invention;
Embodiment
The specific embodiment of the present invention is described below in conjunction with accompanying drawing; below in conjunction with accompanying drawing, the embodiment of the present invention is further described; description below about embodiments of the present invention is just exemplary; the claimed theme be not meant to limit the present invention; other changes in claims also existed for embodiment described in the invention, all belong to the theme that will protect required for the present invention.
As shown in Figure 1, the first step is normalizing treatment, the motor shaft of forging molding is placed in heating unit, be heated to 850 DEG C to 900 DEG C, and keep 1.5 little of 2.5 hours, then put row naturally cooling into motor shaft, naturally cooling is in the air of motor shaft in physical environment and cools;
Second step is modifier treatment, motor shaft is placed in heating unit again, be heated to 850 DEG C to 900 DEG C, and keep 1.5 little of 2.5 hours, then motor shaft being placed into starting temperature is carry out oil quenching cooling process in the fluid of 60 DEG C to 80 DEG C, motor shaft temperature is made to be down to martensitic transformation end temp, namely 190 DEG C to 210 DEG C, and then motor shaft is placed in heating unit, be heated to 500 DEG C to 650 DEG C, and keep 1.5 little of 2.5 hours, then naturally cooling is carried out to motor shaft;
3rd step is mid-frequency induction hardening process, by motor shaft sleeve in the induction coil of quenching inducer, induction coil moves to the other end from motor shaft one end, translational speed is 2mm/s to 3mm/s, the output rating of quenching inducer is preferably 30Kw to 70Kw, induction frequencies is 2500Hz to 8000Hz, is preferably 4000Hz to 8000Hz.Induction coil instantaneously heating motor shaft simultaneously to by the motor shaft surface spraying water-based emulsion liquid heated, mid-frequency induction hardening process need be the quench-hardened case (quenched martensite tissue) of 2.5mm-3.5mm after quenching at the formation thickness of the bottom of the teeth groove of the spline of motor shaft in moving process.
4th step is low-temperaturetempering process, and motor shaft is placed in heating unit, is heated to 160 DEG C to 200 DEG C, and keeps 1.5 little of 2.5 hours.
Motor shaft mentioned above is forging molding, the motor shaft of usual forging molding does not also arrive the accuracy requirement of the meticulous shaping geomery that can carry out practical application etc., so in heat treated process, need the degree shaping according to actual electrical arbor to select to proceed in a certain step or a few step the meticulous forming process of motor shaft, or after motor shaft thermal treatment, proceed the meticulous forming process of motor shaft.Due to the processing treatment that meticulous forming process is shape and size, with herein involved by motor shaft top layer and the heat treating method of internal structure without actual association and impact, therefore not repeat them here.
In above-mentioned four steps, motor shaft is preferably medium carbon steel and medium carbon alloy steel material, and the tooth depth of its spline teeth portion is 5mm-10mm, be applicable to motor shaft that power is 80Kw to 100Kw motor, heating unit is preferably resistance furnace.
Embodiments of the invention are one exemplary embodiment of the present invention; should be understood to be claims of the present invention protection domain in certain demonstrative example wherein; there is directiveness effect those skilled in the art being realized to corresponding technical scheme, but not limitation of the invention.
Claims (8)
1. a motor shaft heat treating method, is characterized in that: comprise the following steps:
(1) normalizing treatment: the motor shaft of forging molding is placed in heating unit, is heated to 850 DEG C to 900 DEG C, and keeps 1.5 little of 2.5 hours, then puts row naturally cooling into motor shaft;
(2) modifier treatment: motor shaft is placed in heating unit again, be heated to 850 DEG C to 900 DEG C, and keep 1.5 little of 2.5 hours, then motor shaft being placed into starting temperature is carry out oil quenching cooling process in the fluid of 60 DEG C to 80 DEG C, make motor shaft temperature be down to martensitic transformation end temp, and then motor shaft is placed in heating unit, be heated to 500 DEG C to 650 DEG C, and keep 1.5 little of 2.5 hours, then naturally cooling is carried out to motor shaft;
(3) mid-frequency induction hardening process: by motor shaft sleeve in the induction coil of quenching inducer, induction coil moves to the other end from motor shaft one end, translational speed is 2mm/s to 3mm/s, induction frequencies is 2500Hz to 8000Hz, induction coil instantaneously heating motor shaft in moving process, also simultaneously to by the motor shaft surface spraying quenchant heated, makes motor shaft surface form quenched martensite tissue;
(4) low-temperaturetempering process: motor shaft is placed in heating unit, is heated to 160 DEG C to 200 DEG C, and keeps 1.5 little of 2.5 hours.
2. motor shaft heat treating method according to claim 1, is characterized in that: described motor shaft is preferably medium carbon steel and medium carbon alloy steel material, the tooth depth of its spline teeth portion is 5mm-10mm, is applicable to the motor shaft that power is 80Kw to 100Kw motor.
3. motor shaft heat treating method according to claim 1, is characterized in that: described naturally cooling is in the air of motor shaft in physical environment and cools.
4. motor shaft heat treating method according to claim 1, is characterized in that: described heating unit is preferably resistance furnace.
5. motor shaft heat treating method according to claim 1, is characterized in that: the martensitic transformation end temp in described modifier treatment is 190 DEG C to 210 DEG C.
6. motor shaft heat treating method according to claim 1, is characterized in that: the quenchant in described mid-frequency induction hardening process is preferably water-based emulsion liquid.
7. motor shaft heat treating method according to claim 1, is characterized in that: in described mid-frequency induction hardening process, and the output rating of induction quenching device is 30Kw to 70Kw, and induction frequencies is preferably 4000Hz to 8000Hz.
8. according to motor shaft heat treating method according to claim 1 or claim 2, it is characterized in that: described mid-frequency induction hardening process need be the quench-hardened case of 2.5mm-3.5mm at the formation thickness of the bottom of the teeth groove of the spline of motor shaft after quenching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510056367.XA CN104651595A (en) | 2015-02-03 | 2015-02-03 | Thermal treatment method for motor shaft |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510056367.XA CN104651595A (en) | 2015-02-03 | 2015-02-03 | Thermal treatment method for motor shaft |
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| Publication Number | Publication Date |
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| CN104651595A true CN104651595A (en) | 2015-05-27 |
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| CN201510056367.XA Pending CN104651595A (en) | 2015-02-03 | 2015-02-03 | Thermal treatment method for motor shaft |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112725604A (en) * | 2020-12-24 | 2021-04-30 | 天津跃峰科技股份有限公司 | Preparation method of eccentric motor shaft |
-
2015
- 2015-02-03 CN CN201510056367.XA patent/CN104651595A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112725604A (en) * | 2020-12-24 | 2021-04-30 | 天津跃峰科技股份有限公司 | Preparation method of eccentric motor shaft |
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| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150527 |
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| WD01 | Invention patent application deemed withdrawn after publication |