CN107460287A - Oil cylinder cylinder defluxing scoops out power annealing process and facilities and equipments - Google Patents
Oil cylinder cylinder defluxing scoops out power annealing process and facilities and equipments Download PDFInfo
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- CN107460287A CN107460287A CN201710823318.3A CN201710823318A CN107460287A CN 107460287 A CN107460287 A CN 107460287A CN 201710823318 A CN201710823318 A CN 201710823318A CN 107460287 A CN107460287 A CN 107460287A
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- cylinder
- oil cylinder
- defluxing
- annealing process
- out power
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000000137 annealing Methods 0.000 title claims abstract description 36
- 230000008569 process Effects 0.000 title claims abstract description 32
- 230000006698 induction Effects 0.000 claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 230000007246 mechanism Effects 0.000 claims description 8
- 238000010304 firing Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 24
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 57
- 230000035882 stress Effects 0.000 description 23
- 238000003754 machining Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000346 nonvolatile oil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- C21D1/30—Stress-relieving
-
- 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
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
-
- 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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of oil cylinder cylinder defluxing to scoop out power annealing process, comprises the following steps：(1) induction coil is stretched into the inner chamber of cylinder barrel of oil cylinder cylinder, and makes the welded seam area position correspondence of induction coil and oil cylinder cylinder；(2) induction coil is powered and the local circle where the welded seam area of oil cylinder cylinder is heated, after the temperature of the local circle where the welded seam area of oil cylinder cylinder reaches preset temperature, isothermal holding is carried out under preset temperature, is finally handled again by air cooling.Annealing cycle of the invention effectively eliminated welding stress no more than 2 hours cans, substantially reduces the time of welding stress, can not only ensure quality, shorten product and hand over the phase, and single-piece is especially suitable for, the scattered cylinder barrel destressing processing of small lot, it is especially suitable for Flexible Production.
Description
Technical field
The present invention relates to annealing destressing field, relate in particular to a kind of oil cylinder cylinder defluxing and scoop out power annealing process
And facilities and equipments.
Background technology
Hydraulic jack is mainly made up of cylinder cap, piston, cylinder bottom, piston rod and cylinder barrel etc..Wherein, cylinder barrel is by cylinder
What the parts such as cylinder, joint, fixed plate, chaining plate were welded.Due to welding stress, therefore meeting be present in welded seam area after welding
Cause the presence of cylinder barrel post welding distortion and residual stress.
If cylinder barrel is handled without destressing, even if postorder honing process by the inner chamber rounding of cylinder barrel, then is transferred to machine and added
Work process is processed, and due to the presence of welding stress, stress release after the machining processes such as ride rank, screw thread, causes finished product cylinder barrel
Body deforms, and product quality is unqualified.
Removing the common method of welding stress has natrual ageing, oscillating aging, ultrasonic wave destressing and annealing destressing.Its
In, destressing of annealing is the current method for removing the welding stress after cylinder barrel welds and commonly using, and in the prior art, mostly uses and moves back
The traditional handicraft of stove stress relieving by annealing, detailed process are that cylinder barrel is loaded into annealing furnace, by 2 hours that cylinder barrel is overall
540 DEG C are heated slowly to, is then incubated 2 hours at this temperature, then carries out the furnace cooling of more than 4 hours.This tradition
Although technique comparative maturity, eliminate stress more thoroughly, steady quality, also there is its weak point：
1. for oil cylinder cylinder production relative cycle length, annealing furnace carry out annealing heating process need 10 hours with
On, finished product oil cylinder order form delivery time is had a great influence.
2. focused on suitable for high-volume, it is impossible to meet small lot, single-piece loose mail, the scattered production of multi items form, shadow
Ring cost and hand over the phase.
3. energy consumption is larger, deformation position is largely welding position, and having carried out cylinder barrel during annealing integrally heats, and there have to be unnecessary
Energy consumption wastes.
The content of the invention
The technical problems to be solved by the invention, which are to provide one kind, can effectively remove welding stress, and the cycle is short, power consumption
Low oil cylinder cylinder defluxing scoops out power annealing process and the equipment for implementing the technique.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme that：Oil cylinder cylinder defluxing connects stress annealing
Technique, comprise the following steps：
(1) induction coil is stretched into the inner chamber of cylinder barrel of oil cylinder cylinder, and makes induction coil and oil cylinder cylinder
Welded seam area position correspondence；
(2) induction coil is powered and the local circle where the welded seam area of oil cylinder cylinder is heated, treat oil
After the temperature of a local circle where the welded seam area of cylinder cylinder barrel reaches preset temperature, carried out under preset temperature at insulation
Reason, finally handled again by air cooling.
Further, heating uses heating in medium frequency, 47~53 DEG C/s of firing rate.The side that the present invention is annealed using intermediate frequency
Formula, not only electric heating conversion efficiency is high for this mode, can save the energy, and also shows in practice compared to high frequency and low
Frequency heats the effect for preferably removing welding stress.Preset temperature is heated to as 700~900 DEG C, only needs the heat time 13~19
Second, process cycle is short.
Further, the cylinder barrel of oil cylinder cylinder uses No. 20 steel or No. 35 steel or No. 45 steel or 27simn steel or 16mn steel
Or Q345 steel is made, preset temperature is 700~900 DEG C, and the time of isothermal holding is 25~75 seconds.Implementing the process of the present invention
In, inventor has found, when cylinder barrel is made of above-mentioned material, specifically chosen above-mentioned process conditions, can more effectively go
Except welding stress.
Further, the unilateral gap of the inwall of the cylinder barrel of induction coil and oil cylinder cylinder is 2~3mm.So design,
There are the higher efficiency of heating surface, relatively low electrical loss.
The equipment for scooping out power annealing process for implementing above-mentioned oil cylinder cylinder defluxing, including supporting mechanism and sensing heating
Mechanism, the supporting mechanism include support frame and the oil cylinder cylinder fixture installed in the top of support frame as described above.
Further, support frame as described above includes base and expansion link, the lower end of the expansion link is connected with the base, on
End is connected with the oil cylinder cylinder fixture.
Further, support frame as described above also includes guide rail, and the bottom of the base is provided with roller, and the base passes through described
Roller-coaster is arranged on the guide rail.
Beneficial effects of the present invention are embodied in：
The present invention is heated using internal heat type induction coil, inside induction coil insertion cylinder barrel, so different cylinder diameter cylinders
Cylinder can share a coil, improve production flexibility and the versatility of heating coil, and the mode of local heating consume energy it is low,
Energy utilization rate is high.
Annealing cycle of the invention is no more than 2 hours, can effectively eliminate welding stress, substantially reduce welding stress
Time, quality can not only be ensured, shorten product and hand over the phase, and be especially suitable for single-piece, the scattered cylinder barrel destressing of small lot
Processing, is especially suitable for Flexible Production.
Brief description of the drawings
Fig. 1 is the structural representation that the present invention is used to implement the equipment that oil cylinder cylinder defluxing scoops out power annealing process.
In accompanying drawing the mark of each part for：11 bases, 12 expansion links, 13 oil cylinder cylinder fixtures, guide rail 14, roller 15,2
Sensing heating machine, 21 induction coils, 3 oil cylinder cylinders, 31 joints.
Embodiment
Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
In order to solve the problems, such as that the traditional handicraft that existing annealing furnace removes the welding stress after cylinder barrel welding is present, this hair
Bright design is a kind of to scoop out power annealing process by induction coil by the oil cylinder cylinder defluxing being internally heated of cylinder barrel, for side
Just understand, first introduce a kind of for implementing the equipment that oil cylinder cylinder defluxing of the present invention scoops out power annealing process.
Referring to Fig. 1, the present invention is used for the equipment that oil cylinder cylinder defluxing scoops out power annealing process, including the He of supporting mechanism 1
Sensing heating machine 2, the supporting mechanism 1 include support frame and the oil cylinder cylinder fixture installed in the top of support frame as described above
13。
In order to facilitate the height of adjustment oil cylinder cylinder, ensure when different cylinder diameter cylinder barrel center intermediate frequencies are annealed in same height
Degree, design support frame as described above include base 11 and expansion link 12, and the lower end of the expansion link 12 is connected with the base 11, upper end
It is connected with the oil cylinder cylinder fixture 13.In specific implementation, expansion link 12 can use existing electric expansion bar, cylinder or
The equipment such as oil cylinder.
In order to facilitate the horizontal level of adjustment oil cylinder cylinder, support frame as described above also includes guide rail 14, the base 11
Bottom is provided with roller 15, and the base 11 is slidably mounted on 14 on the guide rail by the roller 15.
Sensing heating machine 2 is the induction heating equipment of existing conventional induction coil extending type, such as Shenzhen's double flat power supply
The intermediate frequency SPZ series sensing heating products that Technology Co., Ltd. sells.
In use, being fixed oil cylinder cylinder 3 by oil cylinder cylinder fixture 13, the length of expansion link 12 is adjusted, is made
The cylinder barrel of oil cylinder cylinder 3 is consistent with the centre-height of induction coil 21 of sensing heating machine 2, then promotes supporting mechanism 1, will feel
Answer the induction coil 21 of heater 2 to be directed at the cylinder barrel of oil cylinder cylinder 3, base 11 is finally slowly promoted, by sensing heating machine 2
Induction coil 21 gos deep into the inner chamber of the cylinder barrel of oil cylinder cylinder 3, and makes the induction coil 21 and cylinder tube of sensing heating machine 2
Body 3 welded seam area position correspondence (illustrated in figure, the cylinder barrel outer surface of oil cylinder cylinder 3 is welded with joint 31, the joint 31 with
Weld seam between cylinder barrel be present), such induction coil 21 directly local one where the welded seam area of cylinder tube 3 can be enclosed into
Row heating, so as to save the energy, shorten process cycle.
During heating, electric current is larger, and during insulation, when reaching temperature, electric current reduces, and insulating process need not take down workpiece
Come, it is easy to operate.
The specific embodiment that several oil cylinder cylinder defluxings scoop out power annealing process is provided below.
Embodiment 1
Oil cylinder cylinder defluxing scoops out power annealing process, comprises the following steps：
(1) induction coil is stretched into the inner chamber of cylinder barrel of oil cylinder cylinder, and makes induction coil and oil cylinder cylinder
The unilateral gap of the inwall of the cylinder barrel of welded seam area position correspondence, induction coil and oil cylinder cylinder is 2.5mm；
(2) induction coil is powered and the local circle where the welded seam area of oil cylinder cylinder is heated, heated
50 DEG C/s of speed, after the temperature of the local circle where the welded seam area of oil cylinder cylinder reaches 800 DEG C, protect at this temperature
Temperature 25 seconds, is finally air-cooled to room temperature.
In the present embodiment, the cylinder barrel of oil cylinder cylinder is made of No. 20 steel, and elimination is present between joint and cylinder barrel
Welding stress, by test, using the present embodiment annealing process treat oil cylinder cylinder, by machining processes
Afterwards, the deflection of finished product is less than 0.025mm, shows that welding stress is effectively removed.
Embodiment 2
Oil cylinder cylinder defluxing scoops out power annealing process, comprises the following steps：
(1) induction coil is stretched into the inner chamber of cylinder barrel of oil cylinder cylinder, and makes induction coil and oil cylinder cylinder
The unilateral gap of the inwall of the cylinder barrel of welded seam area position correspondence, induction coil and oil cylinder cylinder is 2mm；
(2) induction coil is powered and the local circle where the welded seam area of oil cylinder cylinder is heated, heated
53 DEG C/s of speed, after the temperature of the local circle where the welded seam area of oil cylinder cylinder reaches 900 DEG C, protect at this temperature
Temperature 35 seconds, is finally air-cooled to room temperature.
In the present embodiment, the cylinder barrel of oil cylinder cylinder is made of No. 35 steel, and elimination is present between joint and cylinder barrel
Welding stress, by test, using the present embodiment annealing process treat oil cylinder cylinder, by machining processes
Afterwards, the deflection of finished product is less than 0.03mm, shows that welding stress is effectively removed.
Embodiment 3
Oil cylinder cylinder defluxing scoops out power annealing process, comprises the following steps：
(1) induction coil is stretched into the inner chamber of cylinder barrel of oil cylinder cylinder, and makes induction coil and oil cylinder cylinder
The unilateral gap of the inwall of the cylinder barrel of welded seam area position correspondence, induction coil and oil cylinder cylinder is 3mm；
(2) induction coil is powered and the local circle where the welded seam area of oil cylinder cylinder is heated, heated
47 DEG C/s of speed, after the temperature of the local circle where the welded seam area of oil cylinder cylinder reaches 700 DEG C, protect at this temperature
Temperature 75 seconds, is finally air-cooled to room temperature.
In the present embodiment, the cylinder barrel of oil cylinder cylinder is made of No. 45 steel, and elimination is deposited between chaining plate and cylinder barrel
Welding stress, by test, using the present embodiment annealing process treat oil cylinder cylinder, by machining processes
Afterwards, the deflection of finished product is less than 0.03mm, shows that welding stress is effectively removed.
In addition, by checking, when the cylinder barrel of oil cylinder cylinder is made of 27simn steel or 16mn steel or Q345 steel, use
The method of above-described embodiment removes welding stress, and the deflection of final finished shows that welding stress is had again smaller than 0.03mm
Effect removes.
It should be understood that example as described herein and embodiment are not intended to limit the invention, this area only for explanation
Technical staff can make various modifications or change according to it, within the spirit and principles of the invention, any modification for being made,
Equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (7)
1. oil cylinder cylinder defluxing scoops out power annealing process, it is characterised in that：Comprise the following steps：
(1) induction coil is stretched into the inner chamber of cylinder barrel of oil cylinder cylinder, and makes the weld seam of induction coil and oil cylinder cylinder
Regional location is corresponding；
(2) induction coil is powered and the local circle where the welded seam area of oil cylinder cylinder is heated, treat oil cylinder
After the temperature of a local circle where the welded seam area of cylinder reaches preset temperature, isothermal holding is carried out under preset temperature, most
Handled again by air cooling afterwards.
2. oil cylinder cylinder defluxing as claimed in claim 1 scoops out power annealing process, it is characterised in that：Heating is added using intermediate frequency
Heat, 47~53 DEG C/s of firing rate.
3. oil cylinder cylinder defluxing as claimed in claim 1 or 2 scoops out power annealing process, it is characterised in that：Oil cylinder cylinder
Cylinder barrel be made of No. 20 steel or No. 35 steel or No. 45 steel or 27simn steel or 16mn steel or Q345 steel, preset temperature 700
~900 DEG C, the time of isothermal holding is 25~75 seconds.
4. oil cylinder cylinder defluxing as claimed in claim 1 or 2 scoops out power annealing process, it is characterised in that：Induction coil and
The unilateral gap of the inwall of the cylinder barrel of oil cylinder cylinder is 2~3mm.
5. for implementing the equipment that the oil cylinder cylinder defluxing any one of Claims 1-4 4 scoops out power annealing process, its
It is characterised by：Including supporting mechanism (1) and sensing heating machine (2), the supporting mechanism (1) includes support frame and installed in described
The oil cylinder cylinder fixture (13) at the top of support frame.
6. as claimed in claim 5 be used to implement the equipment that oil cylinder cylinder defluxing scoops out power annealing process, it is characterised in that：
Support frame as described above includes base (11) and expansion link (12), the lower end of the expansion link (12) is connected with the base (11), on
End is connected with the oil cylinder cylinder fixture (13).
7. as claimed in claim 6 be used to implement the equipment that oil cylinder cylinder defluxing scoops out power annealing process, it is characterised in that：
Support frame as described above also includes guide rail (14), and the bottom of the base (11) is provided with roller (15), and the base (11) is by described
Roller (15) is slidably mounted on the guide rail (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710823318.3A CN107460287A (en) | 2017-09-13 | 2017-09-13 | Oil cylinder cylinder defluxing scoops out power annealing process and facilities and equipments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710823318.3A CN107460287A (en) | 2017-09-13 | 2017-09-13 | Oil cylinder cylinder defluxing scoops out power annealing process and facilities and equipments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107460287A true CN107460287A (en) | 2017-12-12 |
Family
ID=60551524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710823318.3A Pending CN107460287A (en) | 2017-09-13 | 2017-09-13 | Oil cylinder cylinder defluxing scoops out power annealing process and facilities and equipments |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107460287A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111571051A (en) * | 2020-05-06 | 2020-08-25 | 徐州徐工基础工程机械有限公司 | Pre-welding preheating and post-welding heat treatment system and method for outer key of rotary drilling drill rod |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1478204A (en) * | 1973-07-16 | 1977-06-29 | Hehl Karl | Method and device for producing surface-hardened regions on alloy steel articles |
| US4418258A (en) * | 1980-07-07 | 1983-11-29 | Halliburton Company | Method for heat treating metal |
| US5488219A (en) * | 1993-12-13 | 1996-01-30 | Neturen Co., Ltd. | Induction heating coil assembly and method for hardening inner surface of cylinder by using the same |
| JPH10324914A (en) * | 1997-05-23 | 1998-12-08 | Fuji Denshi Kogyo Kk | Method for shift-hardening inner surface of bottomed cylindrical work and apparatus for shift-hardening inner surface |
| JP2004043919A (en) * | 2002-07-15 | 2004-02-12 | High Frequency Heattreat Co Ltd | Induction heating tempering apparatus for cylindrical member and cylinder block having variation in thickness |
| CN1640197A (en) * | 2002-02-28 | 2005-07-13 | 岛田理化工业株式会社 | Inner diameter surface induction heating coil |
| JP2014025118A (en) * | 2012-07-27 | 2014-02-06 | Fuji Electric Co Ltd | Induction heating apparatus |
| CN204385242U (en) * | 2015-01-15 | 2015-06-10 | 山东远通锻造股份有限公司 | A kind of induction hardening equipment |
| CN205258532U (en) * | 2015-12-21 | 2016-05-25 | 燕山大学 | Transversal joint submerged arc weld pipe induction heater |
-
2017
- 2017-09-13 CN CN201710823318.3A patent/CN107460287A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1478204A (en) * | 1973-07-16 | 1977-06-29 | Hehl Karl | Method and device for producing surface-hardened regions on alloy steel articles |
| US4418258A (en) * | 1980-07-07 | 1983-11-29 | Halliburton Company | Method for heat treating metal |
| US5488219A (en) * | 1993-12-13 | 1996-01-30 | Neturen Co., Ltd. | Induction heating coil assembly and method for hardening inner surface of cylinder by using the same |
| JPH10324914A (en) * | 1997-05-23 | 1998-12-08 | Fuji Denshi Kogyo Kk | Method for shift-hardening inner surface of bottomed cylindrical work and apparatus for shift-hardening inner surface |
| CN1640197A (en) * | 2002-02-28 | 2005-07-13 | 岛田理化工业株式会社 | Inner diameter surface induction heating coil |
| JP2004043919A (en) * | 2002-07-15 | 2004-02-12 | High Frequency Heattreat Co Ltd | Induction heating tempering apparatus for cylindrical member and cylinder block having variation in thickness |
| JP2014025118A (en) * | 2012-07-27 | 2014-02-06 | Fuji Electric Co Ltd | Induction heating apparatus |
| CN204385242U (en) * | 2015-01-15 | 2015-06-10 | 山东远通锻造股份有限公司 | A kind of induction hardening equipment |
| CN205258532U (en) * | 2015-12-21 | 2016-05-25 | 燕山大学 | Transversal joint submerged arc weld pipe induction heater |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111571051A (en) * | 2020-05-06 | 2020-08-25 | 徐州徐工基础工程机械有限公司 | Pre-welding preheating and post-welding heat treatment system and method for outer key of rotary drilling drill rod |
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Application publication date: 20171212 |