CN104178601A - Surface hardening method for bolt - Google Patents
Surface hardening method for bolt Download PDFInfo
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- CN104178601A CN104178601A CN201410402756.9A CN201410402756A CN104178601A CN 104178601 A CN104178601 A CN 104178601A CN 201410402756 A CN201410402756 A CN 201410402756A CN 104178601 A CN104178601 A CN 104178601A
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- frequency quenching
- surface hardening
- bolt
- screw
- heat
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a surface hardening method for a bolt. The surface hardening method comprises a high-frequency quenching step, wherein the high-frequency quenching step is as follows: carrying out surface hardening treatment on a bolt which is made of 42CrMo by use of electron tube inducting and heating equipment, wherein the process parameters of the electron tube inducting and heating equipment are as follows: the anode voltage is 9.6-10.2KV, the anode current is 2.0-2.1A, the grid current is 0.3-0.33A, and the heating time is 4.5-5.2 seconds; and a cooling medium used in the high-frequency quenching step is a PAG (poly alkylene glycol) aqueous liquor quenching medium. The surface hardening method is simple in route, capable of effectively reducing the depth of a decarburized layer in a high-frequency quenching process of the bolt, shortening the high-frequency quenching time and preventing threads from generating cracks in the high-frequency quenching process.
Description
Technical field
The present invention relates to machining surface treatment process field, particularly relate to a kind of case hardening process of screw.
Background technology
High-frequency quenching is utilize electromagnetic induction to produce eddy current in workpiece and workpiece is heated: workpiece is put in inductor block, inductor block is generally the hollow copper tubing of input intermediate frequency or high-frequency alternating current, in the alternating magnetic field that workpiece produces at hollow copper tubing, produce the induced current of same frequency, this induced current is very weak in the upper outside surface cavity of workpiece, inside, utilize this surface action, can make workpiece surface heat up rapidly, can rise to more than 1000 DEG C at several seconds internal surface temperatures, to reach the object that workpiece is heat-treated.
Along with the further raising of existing manufacture and mounting technology, modified bolt has obtained using more and more widely in industrial circle, in prior art, bolt is carried out to the former of high-frequency quenching because need to obtain the darker surface hardening layer depth of bolt, but in existing bolt quenching technology, easily cause quenching not for occurring crackle and producing thicker Decarburized layer, be unfavorable for the over-all properties of modified bolt.
Summary of the invention
In above-mentioned prior art bolt quenching technology, easily cause quenching not for occurring crackle and producing thicker Decarburized layer, be unfavorable for the problem of the over-all properties of modified bolt, the invention provides a kind of case hardening process of screw.
For the problems referred to above, the case hardening process of a kind of screw provided by the invention reaches goal of the invention by following technical essential: a kind of case hardening process of screw, comprise high-frequency quenching step, described high-frequency quenching step is to adopt the screw that electron tube induction heating equipment is 42CrMo to material to carry out surface hardening processing, the processing parameter of described electron tube induction heating equipment is: anode voltage is 9.6-10.2KV, anodic current is 2.0-2.1A, grid current is 0.3-0.33A, and be 4.5-5.2s heat-up time;
Also comprise the heat-eliminating medium for high-frequency quenching step, described heat-eliminating medium is PAG aqueous solution quench medium.
This operational path is simple, be convenient to realize: by the control to high-frequency quenching equipment processing parameter, make to shorten in the situation of 4.5-5.2s heat-up time quenching, can obtain equally desirable high-frequency quenching effect, meanwhile, along with the shortening of heat-up time, greatly reduced the degree of depth of Decarburized layer in high-frequency quenching process, through test of many times, the screw decarburized layer deepness that this operational path obtains is below 0.01mm; This operational path, by the restriction to heat-eliminating medium, adopts PAG aqueous solution quench medium to substitute the polyvinyl alcohol solution extensively adopting in prior art, has avoided the defect of the crackle easily bringing to high-frequency quenching due to the complex construction on screw surface.
Further technical scheme is:
For making to obtain tiny uniform tempered sorbite tissue before high-frequency quenching, be beneficial to the hardness of screw after high-frequency quenching, further ensure on screw, not occur in high-frequency quenching process before described high-frequency quenching step, also to comprise modifier treatment step by crackle.
The present invention has following beneficial effect:
This operational path is simple, be convenient to realize: by the control to high-frequency quenching equipment processing parameter, make to shorten in the situation of 4.5-5.2s heat-up time quenching, can obtain equally desirable high-frequency quenching effect, meanwhile, along with the shortening of heat-up time, greatly reduced the degree of depth of Decarburized layer in high-frequency quenching process, through test of many times, the screw decarburized layer deepness that this operational path obtains is below 0.01mm; This operational path is by the restriction to heat-eliminating medium, adopt PAG aqueous solution quench medium to substitute the polyvinyl alcohol solution extensively adopting in prior art, avoid the defect of the crackle easily bringing to high-frequency quenching due to the complex construction on screw surface, be conducive to the high-frequency quenching heat treatment efficiency of screw, the quality product of screw.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but structure of the present invention is not limited only to following examples.
Embodiment 1:
A kind of case hardening process of screw, comprise high-frequency quenching step, described high-frequency quenching step is to adopt the screw that electron tube induction heating equipment is 42CrMo to material to carry out surface hardening processing, the processing parameter of described electron tube induction heating equipment is: anode voltage is 9.6-10.2KV, anodic current is 2.0-2.1A, grid current is 0.3-0.33A, and be 4.5-5.2s heat-up time;
Also comprise the heat-eliminating medium for high-frequency quenching step, described heat-eliminating medium is PAG aqueous solution quench medium.
This operational path is simple, be convenient to realize: by the control to high-frequency quenching equipment processing parameter, make to shorten in the situation of 4.5-5.2s heat-up time quenching, can obtain equally desirable high-frequency quenching effect, meanwhile, along with the shortening of heat-up time, greatly reduced the degree of depth of Decarburized layer in high-frequency quenching process, through test of many times, the screw decarburized layer deepness that this operational path obtains is below 0.01mm; This operational path, by the restriction to heat-eliminating medium, adopts PAG aqueous solution quench medium to substitute the polyvinyl alcohol solution extensively adopting in prior art, has avoided the defect of the crackle easily bringing to high-frequency quenching due to the complex construction on screw surface.
Embodiment 2:
The present embodiment is further qualified on the basis of embodiment 1: for making to obtain tiny uniform tempered sorbite tissue before high-frequency quenching, be beneficial to the hardness of screw after high-frequency quenching, further ensure on screw, not occur in high-frequency quenching process before described high-frequency quenching step, also to comprise modifier treatment step by crackle.
Above content is the further description of the present invention being done in conjunction with concrete preferred implementation, can not assert that the specific embodiment of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, not departing from other embodiments that draw under technical scheme of the present invention, all should be included in protection scope of the present invention.
Claims (2)
1. the case hardening process of a screw, comprise high-frequency quenching step, described high-frequency quenching step is to adopt the screw that electron tube induction heating equipment is 42CrMo to material to carry out surface hardening processing, it is characterized in that, the processing parameter of described electron tube induction heating equipment is: anode voltage is 9.6-10.2KV, anodic current is 2.0-2.1A, and grid current is 0.3-0.33A, and be 4.5-5.2s heat-up time;
Also comprise the heat-eliminating medium for high-frequency quenching step, described heat-eliminating medium is PAG aqueous solution quench medium.
2. the case hardening process of a kind of screw according to claim 1, is characterized in that, also comprises modifier treatment step before described high-frequency quenching step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410402756.9A CN104178601A (en) | 2014-08-17 | 2014-08-17 | Surface hardening method for bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410402756.9A CN104178601A (en) | 2014-08-17 | 2014-08-17 | Surface hardening method for bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104178601A true CN104178601A (en) | 2014-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410402756.9A Pending CN104178601A (en) | 2014-08-17 | 2014-08-17 | Surface hardening method for bolt |
Country Status (1)
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| CN (1) | CN104178601A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106929644A (en) * | 2017-02-28 | 2017-07-07 | 蚌埠市华鼎机械科技有限公司 | A kind of cold lead ingot granulator shears the quenching medium of slice surface treatment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006015669B3 (en) * | 2006-04-04 | 2007-10-25 | Adcuram Maschinenbauholding Gmbh | Method for converting the metallic structure of a plasticizing screw comprises impinging the wear region with an alternating current, producing resistance heat to raise the wear region to a hardening temperature and cooling the region |
| CN102094153A (en) * | 2011-03-02 | 2011-06-15 | 上海工程技术大学 | High-strength high-toughness alloy steel for bolts and preparation method thereof |
| CN102152078A (en) * | 2011-03-30 | 2011-08-17 | 浙江迪特高强度螺栓有限公司 | Processing technique for high-strength bolt adopted by bulldozer or excavator pedrail |
| EP2737960A1 (en) * | 2012-12-03 | 2014-06-04 | Sol Full International, Ltd. | Screw and method for manufacturing the same |
-
2014
- 2014-08-17 CN CN201410402756.9A patent/CN104178601A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006015669B3 (en) * | 2006-04-04 | 2007-10-25 | Adcuram Maschinenbauholding Gmbh | Method for converting the metallic structure of a plasticizing screw comprises impinging the wear region with an alternating current, producing resistance heat to raise the wear region to a hardening temperature and cooling the region |
| CN102094153A (en) * | 2011-03-02 | 2011-06-15 | 上海工程技术大学 | High-strength high-toughness alloy steel for bolts and preparation method thereof |
| CN102152078A (en) * | 2011-03-30 | 2011-08-17 | 浙江迪特高强度螺栓有限公司 | Processing technique for high-strength bolt adopted by bulldozer or excavator pedrail |
| EP2737960A1 (en) * | 2012-12-03 | 2014-06-04 | Sol Full International, Ltd. | Screw and method for manufacturing the same |
Non-Patent Citations (1)
| Title |
|---|
| 阎承沛: "《典型零件热处理缺陷分析及对策480例》", 31 July 2008 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106929644A (en) * | 2017-02-28 | 2017-07-07 | 蚌埠市华鼎机械科技有限公司 | A kind of cold lead ingot granulator shears the quenching medium of slice surface treatment |
| CN106929644B (en) * | 2017-02-28 | 2018-06-08 | 蚌埠市华鼎机械科技有限公司 | A kind of quenching medium of cold lead ingot granulator shearing slice surface processing |
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Application publication date: 20141203 |
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| RJ01 | Rejection of invention patent application after publication |