CN108018405B - The untransferable arc quenching technology for surfaces that the full surface of screw thread alveolus is hardened simultaneously - Google Patents
The untransferable arc quenching technology for surfaces that the full surface of screw thread alveolus is hardened simultaneously Download PDFInfo
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- CN108018405B CN108018405B CN201711261323.6A CN201711261323A CN108018405B CN 108018405 B CN108018405 B CN 108018405B CN 201711261323 A CN201711261323 A CN 201711261323A CN 108018405 B CN108018405 B CN 108018405B
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- screw thread
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
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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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- Thermal Sciences (AREA)
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- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses the untransferable arc quenching technology for surfaces that a kind of full surface of screw thread alveolus is hardened simultaneously, the two sides for the processed workpiece screw thread alveolus that step obtains according to the present invention and alveolus bottom surface hardness reach 580HV1~710HV1, and thread crest surface hardness is 400HV1~590HV1.The present invention hardens the two sides and alveolus bottom surface of screw thread alveolus using untransferable arc simultaneously, surface hardness reaches 580HV1~710HV1, thread crest surface hardness reaches 400HV1~590HV1 simultaneously, it effectively increases the wearability of screw element and is not easy the performance of thread gluing, while also improving the comprehensive mechanical property of thread root；Technical process uses untransferable arc heat source, and facility compact, concise in technology is easy to maintain, is conducive to the promotion and application of technology.
Description
Technical field
The invention belongs to the surface heat treatment process fields of screw thread more particularly to a kind of full surface of screw thread alveolus to harden simultaneously
Untransferable arc quenching technology for surfaces.
Background technique
Untransferable arc surface hardening processing is quickly to be heated using untransferable arc as heat source to workpiece surface, makes to be added
The temperature in hot spot reaches phase transition temperature or more in a very short period of time, then required for workpiece itself cooling and phase transformation acquisition
Tissue, to make to heat the performances such as position acquisition ultrahigh hardness, high-wearing feature, fatigue resistance, to improve the service life of part.
The advance of untransferable arc surface hardening processing has: untransferable arc surface hardening handles that martensitic crystal grains are thin, dislocation
Density is high, and hardness is high, and wearability is good；Workpiece deformation is minimum, or even without deformation, is suitable for high-precision part processing, part processing
After can be used directly or only need to refine；It is compression that untransferable arc surface hardening, which handles rear surface, is not likely to produce crackle, can be significant
Improve fatigue resistance；Untransferable arc surface hardening processing hardened layer hardness gradient is very small, and hardness is not substantially with hardened-depth
Change and changes；Suitable material is extensive, including various medium and high carbon steels, tool steel, mould steel and cast iron materials etc.；Low-carbon ring
It protects, facilitates field operation etc., so that untransferable arc surface hardening processing technique has a vast market foreground and promotion price
Value.When other relevant surfaces quenching treatment technologies are applied to screw thread, main problem is that thread top surface is intersected with thread groove side
Place is easy fusing, so that these technologies can only individually handle the crest face or side or the circular bead surface of screw thread etc. of screw thread, this
Sample either internal screw thread or external screw thread, after threaded engagement, the stress surface of thread and the mechanical property at screw thread tooth base are difficult to
Meet the needs of screw product comprehensively.
Summary of the invention
The present invention provides the untransferable arc quenching technology for surfaces that a kind of full surface of screw thread alveolus is hardened simultaneously, works processed
The two sides of part screw thread alveolus and alveolus bottom surface hardness reach 580HV1~710HV1, thread crest surface hardness be 400HV1~
590HV1, relative to other surface hardening treatment process, energy saving, resource simplifies technique, facilitates operation；Technical process is adopted
With untransferable arc heat source, facility compact, concise in technology is easy to maintain, is conducive to the promotion and application of technology.
Technical scheme is as follows:
The untransferable arc quenching technology for surfaces that a kind of full surface of screw thread alveolus is hardened simultaneously, it is characterised in that successively containing with
Lower step:
(1), according to the opening of screw thread alveolus at the extended distance or internal screw thread path of screw thread alveolus at external screw thread major diameter away from
Nozzle bore from selection untransferable arc generator, untransferable arc arc flame can be covered with screw thread alveolus simultaneously when meeting actual treatment
Two sides and bottom surface；
(2), installation clamps whorl work piece, fixed untransferable arc generator, untransferable arc generator arc flame outlet alignment spiral shell
Line alveolus, untransferable arc generator nozzle exit end face and tooth bottom surface distance are 2.5~4.5mm bigger than thread height；
(3), machine tool movement parameter is adjusted, it is desirable that whorl work piece is revolved with lathe spindle during untransferable arc surface hardening
Turn, when untransferable arc generator is mobile with knife rest, the outlet of untransferable arc generator arc flame is directed at screw thread alveolus always；
(4), untransferable arc arc flame is directly ejected into the two sides and bottom of screw thread alveolus simultaneously during reality is quenched
Face is not only individually to handle thread top surface, bottom surface or side；
(5), according to the size of the material of whorl work piece and thread slot space, suitable electric current 80A~130A, spiral shell are selected
The linear velocity in crest face is 1.5m/min~3m/min when line workpiece rotation, to prevent thread top surface from intersecting with thread groove side
Place's fusing, is handled using untransferable arc surface hardening；
(6), the two sides of the processed workpiece screw thread alveolus obtained according to above-mentioned steps and alveolus bottom surface hardness reach
580HV1~710HV1, thread crest surface hardness are 400HV1~590HV1.
The untransferable arc generator nozzle aperture is the extended distance or internal screw thread of screw thread alveolus at external screw thread major diameter
The extended distance of screw thread alveolus at path.
The untransferable arc generator nozzle exit end face and tooth bottom surface distance is 2.5~4.5mm bigger than thread height, real
Untransferable arc arc flame is directly ejected into thread groove bottom and two sides simultaneously in the treatment process of border.
The untransferable arc surface hardening processing electric current is 80A~130A, the linear speed in crest face when whorl work piece rotates
Degree is 1.5m/min~3m/min.
The untransferable arc surface hardening processing is adopted to prevent thread top surface and thread groove side intersection from melting
It is handled with untransferable arc surface hardening.
Beneficial effects of the present invention:
The two sides of processed workpiece screw thread alveolus of the present invention and alveolus bottom surface hardness reach 580HV1~710HV1, screw thread
Crest surface hardness is 400HV1~590HV1, has excellent synthesis at threaded engagement rear thread contact face and screw thread tooth base
Mechanical property, and relative to other surface hardening treatment process, energy saving, resource simplifies technique, facilitates operation；Technique mistake
Cheng Caiyong untransferable arc heat source, facility compact, concise in technology is easy to maintain, is conducive to the promotion and application of technology.
Detailed description of the invention
Fig. 1 is the principle of the present invention schematic diagram.
Specific embodiment
The untransferable arc quenching technology for surfaces that a kind of full surface of screw thread alveolus is hardened simultaneously, it is characterised in that successively containing with
Lower step:
(1), according to the opening of screw thread alveolus at the extended distance or internal screw thread path of screw thread alveolus at external screw thread major diameter away from
Nozzle bore from selection untransferable arc generator, untransferable arc arc flame can be covered with screw thread alveolus simultaneously when meeting actual treatment
Two sides and bottom surface；
(2), installation clamps whorl work piece, fixed untransferable arc generator, untransferable arc generator arc flame outlet alignment spiral shell
Line alveolus, untransferable arc generator nozzle exit end face and tooth bottom surface distance are 2.5~4.5mm bigger than thread height；
(3), machine tool movement parameter is adjusted, it is desirable that whorl work piece is revolved with lathe spindle during untransferable arc surface hardening
Turn, when untransferable arc generator is mobile with knife rest, the outlet of untransferable arc generator arc flame is directed at screw thread alveolus always；
(4), during practical quenching treatment untransferable arc arc flame can directly be ejected into simultaneously screw thread alveolus two sides and
Bottom surface is not only individually to handle thread top surface, bottom surface or side；
(5), according to the size of the material of whorl work piece and thread slot space, suitable electric current 80A~130A, spiral shell are selected
The linear velocity in crest face is 1.5m/min~3m/min when line workpiece rotation, to prevent thread top surface from intersecting with thread groove side
Place's fusing, is handled using untransferable arc surface hardening；
(6), the two sides of the processed workpiece screw thread alveolus obtained according to above-mentioned steps and alveolus bottom surface hardness reach
580HV1~710HV1, thread crest surface hardness are 400HV1~590HV1.
The untransferable arc generator nozzle aperture is the extended distance or internal screw thread of screw thread alveolus at external screw thread major diameter
The extended distance of screw thread alveolus at path；Untransferable arc generator nozzle end face and tooth bottom surface distance it is bigger than thread height by 2.5~
4.5mm, untransferable arc arc flame is directly ejected into thread groove bottom and two sides simultaneously in actual process；At surface hardening
Reason electric current is 80A~130A, and the linear velocity in crest face is 1.5m/min~3m/min when whorl work piece rotates；Using untransferable arc
Surface hardening processing.
(hereinafter referred to as with patent of invention " plasma quenching method of screw threads of petroleum drilling tools, CN 101565772B "
CN101565772 it) compares, it is not the plasma beam of other forms that the heat source the invention patent used, which requires untransferable arc,；From spiral shell
The force analysis and performance requirement of line actual use set out, and the process object of the invention patent is the alveolus of external screw thread or internal screw thread
Full surface, and be to harden simultaneously, the hardening of thread top surface is realized by material flash heat transfer, patent
CN101565772 handles the circular bead surface of the externally threaded crest of oil drilling tools, internal screw thread respectively；No matter is processing result the invention patent
External screw thread or internal screw thread, the hardness of alveolus two sides and tooth bottom surface is higher than the hardness of crest, preferably improve screw thread by
The performance of power face and root of the tooth.
The principle of the present invention are as follows: as shown in Figure 1, the chuck 1 of whorl work piece 2 is clamped, according to screw thread at external screw thread major diameter
The nozzle bore of the extended distance L selection untransferable arc generator 3 of alveolus；Using untransferable arc generator fixing seat 4 by non-turn
It moves arc generator 3 to be fixed on knife rest, follow rest makes 3 jet expansion end face of untransferable arc generator and tooth bottom surface distance than tooth
Big 2.5~the 4.5mm of type height, the alveolus of 3 arc flame of untransferable arc generator outlet alignment whorl work piece 2, so that untransferable arc table
Untransferable arc arc flame 5 is directly ejected on the two sides b and bottom surface c of screw thread alveolus simultaneously during the quenching treatment of face, reaches spiral shell
The purpose that the two sides b and bottom surface c of line alveolus are hardened simultaneously；It is 80A~130A, screw thread that untransferable arc surface hardening, which handles electric current,
The linear velocity of crest face a is 1.5m/min~3m/min when workpiece 2 rotates, to prevent thread top surface a and thread groove side b phase
It melts at friendship, is handled using untransferable arc surface hardening.Handle the alveolus two sides b and alveolus bottom surface c hardness of rear thread workpiece 2
Reach 580HV1~710HV1, thread top surface a hardness is 400HV1~590HV1.
Untransferable arc arc flame is after the injection of the nozzle of untransferable arc generator, and the jet velocity of arc flame axis is maximum, arc flame
With the increase for leaving axial line distance on cross section, the jet velocity of arc flame is gradually reduced.Above-mentioned thread rooved face is simultaneously
The untransferable arc quenching technology for surfaces of hardening, untransferable arc generator exports are directed at the alveolus of whorl work piece, and untransferable arc is sent out
The nozzle bore of raw device is consistent with the extended distance of screw thread alveolus, the bottom of the axis alignment screw thread alveolus of such untransferable arc arc flame
Face, and jet velocity is maximum, encounters the obstruction of thread groove bottom, the two sides reflux of arc flame threadingly alveolus, and is flowing back
In the process, but encounter untransferable arc arc flame threadingly alveolus side injection arc flame inhibition, these interaction so that non-
Transferred arc arc flame pass to screw thread alveolus two sides and bottom surface energy it is substantially uniform, realize screw thread alveolus two sides and bottom
The effect that face is hardened simultaneously.The untransferable arc quenching technology for surfaces that the full surface of screw thread alveolus is hardened simultaneously, the two of screw thread alveolus
During side and bottom surface are hardened simultaneously, can also it be hardened by heat transfer thread top surface, but with untransferable arc generator
Threadingly alveolus moves, since the crest face of two adjacent thread slots is in the centre of two screw thread alveolus, this intermediate thread
Top surface can heat twice, can locally be tempered, and cause the hardness of thread top surface than the two sides of screw thread alveolus and the hardness of bottom surface
It is low, but the hardness having can also bear certain percussion, guarantee that thread surface is not easy to be broken.In addition threaded engagement
Afterwards, screw thread is nor affected on even if the hardness of thread top surface is slightly lower since there are gaps between thread top surface and alveolus bottom surface
Service performance.Consider the physical characteristic of untransferable arc electric discharge, the untransferable arc surface hardening that thread rooved face hardens simultaneously
Technique is handled using untransferable arc, avoids the defect of thread top surface and the fusing of thread groove side intersection.
Application example is as follows:
Embodiment 1:
Basis material: 42CrMo tool joint, connector outer diameter Φ 105mm, wall thickness 6mm, internal screw thread screw pitch 6.35mm.Non- turn
It moves arc and is quenched parameter: untransferable arc generator nozzle aperture Φ 4.8mm, generator nozzle exit end face and tooth bottom surface distance
4mm bigger than thread height, electric current 100A, the linear velocity in internal screw thread crest face is 2m/min when whorl work piece rotates.
Fillet is cut along tool joint axial direction using wire cutting after processing, production sample is small negative using 200HV-5 type
It is as follows that lotus Vickers detects thread crest, thread groove bottom and the surface hardness of two sides:
Thread crest surface hardness: 435HV1~500HV1
Thread groove bottom surface hardness: 620HV1~640HV1
Screw thread alveolus side surface hardness: 625HV1~655HV1
Embodiment 2:
Basis material: 40Cr tool joint, connector outer diameter Φ 108mm, wall thickness 12mm, external screw thread screw pitch 6.35mm.Non- turn
It moves arc and is quenched parameter: untransferable arc generator nozzle aperture Φ 5.6mm, generator nozzle exit end face and tooth bottom surface distance
4mm bigger than thread height, electric current 120A, the linear velocity in external screw thread crest face is 1.8m/min when whorl work piece rotates.
Fillet is cut along tool joint axial direction using wire cutting after processing, production sample is small negative using 200HV-5 type
It is as follows that lotus Vickers detects thread crest, thread groove bottom and the surface hardness of two sides:
Thread crest surface hardness: 425HV1~490HV1
Thread groove bottom surface hardness: 595HV1~610HV1
Screw thread alveolus side surface hardness: 605HV1~645HV1
To sum up show: the untransferable arc surface hardening on the full surface of screw thread alveolus while hardening that are provided using the invention patent
Technique, no matter internal threads or external screw thread, can effectively improve thread groove bottom surface hardness and screw thread alveolus side table
Surface hardness, while thread crest surface can also be made to keep certain surface hardness, and then effectively improve the quality of screw product, prolong
The service life of long screw product.
Claims (3)
1. a kind of full surface of screw thread alveolus simultaneously harden untransferable arc quenching technology for surfaces, it is characterised in that: successively containing with
Lower step:
(1), it is selected according to the extended distance of screw thread alveolus at the extended distance or internal screw thread path of screw thread alveolus at external screw thread major diameter
The nozzle bore for selecting untransferable arc generator, untransferable arc arc flame can be covered with the two sides of screw thread alveolus simultaneously when meeting actual treatment
Face and bottom surface；
(2), installation clamps whorl work piece, fixed untransferable arc generator, untransferable arc generator arc flame outlet alignment thread
Slot, untransferable arc generator nozzle exit end face and tooth bottom surface distance are 2.5~4.5mm bigger than thread height；
(3), machine tool movement parameter is adjusted, it is desirable that whorl work piece is rotated with lathe spindle during untransferable arc surface hardening, non-
When transferred arc generator is mobile with knife rest, the outlet of untransferable arc generator arc flame is directed at screw thread alveolus always；
(4), untransferable arc arc flame is directly ejected into the two sides and bottom surface of screw thread alveolus simultaneously during reality is quenched, no
It is only individually to handle thread top surface, bottom surface or side；
(5), according to the size of the material of whorl work piece and thread slot space, suitable electric current 80A~130A, screw thread work are selected
The linear velocity in crest face is 1.5m/min~3m/min when part rotates, to prevent thread top surface and thread groove side intersection molten
Change, is handled using untransferable arc surface hardening；
(6), the two sides of the processed workpiece screw thread alveolus obtained according to above-mentioned steps and alveolus bottom surface hardness reach 580HV1
~710HV1, thread crest surface hardness are 400HV1~590HV1.
2. the untransferable arc quenching technology for surfaces that the full surface of screw thread alveolus according to claim 1 is hardened simultaneously, feature
Be: in the untransferable arc surface hardening treatment process, untransferable arc arc flame can be covered with the two sides of screw thread alveolus simultaneously
And bottom surface, meet the requirement on the full surface of screw thread alveolus while hardening.
3. the untransferable arc quenching technology for surfaces that the full surface of screw thread alveolus according to claim 2 is hardened simultaneously, feature
Be: the nozzle bore of the untransferable arc generator changes with the variation of actual thread diameter and pitch dimension, and root
It is chosen according to the extended distance of screw thread alveolus at the extended distance or internal screw thread path of screw thread alveolus at external screw thread major diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711261323.6A CN108018405B (en) | 2017-12-04 | 2017-12-04 | The untransferable arc quenching technology for surfaces that the full surface of screw thread alveolus is hardened simultaneously |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711261323.6A CN108018405B (en) | 2017-12-04 | 2017-12-04 | The untransferable arc quenching technology for surfaces that the full surface of screw thread alveolus is hardened simultaneously |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108018405A CN108018405A (en) | 2018-05-11 |
| CN108018405B true CN108018405B (en) | 2019-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711261323.6A Active CN108018405B (en) | 2017-12-04 | 2017-12-04 | The untransferable arc quenching technology for surfaces that the full surface of screw thread alveolus is hardened simultaneously |
Country Status (1)
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| CN (1) | CN108018405B (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2233409Y (en) * | 1995-06-24 | 1996-08-21 | 华南理工大学 | Numerically-controlled plasma arc heat treating machine |
| WO2000013785A1 (en) * | 1998-09-02 | 2000-03-16 | Jacobus Swanepoel | Treatment of solid carbonaceous material |
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- 2017-12-04 CN CN201711261323.6A patent/CN108018405B/en active Active
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