CN102912089B - Online induction heating and shallow hardening process after outer thread processing of pipe end - Google Patents
Online induction heating and shallow hardening process after outer thread processing of pipe end Download PDFInfo
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- CN102912089B CN102912089B CN201210435489.6A CN201210435489A CN102912089B CN 102912089 B CN102912089 B CN 102912089B CN 201210435489 A CN201210435489 A CN 201210435489A CN 102912089 B CN102912089 B CN 102912089B
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- 230000006698 induction Effects 0.000 title claims abstract description 71
- 238000010438 heat treatment Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000008569 process Effects 0.000 title claims abstract description 19
- 230000007246 mechanism Effects 0.000 claims abstract description 28
- 238000005553 drilling Methods 0.000 claims abstract description 12
- 238000003754 machining Methods 0.000 claims abstract description 9
- 208000034189 Sclerosis Diseases 0.000 claims description 13
- 230000000694 effects Effects 0.000 abstract description 10
- 230000009471 action Effects 0.000 abstract description 2
- 230000004044 response Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 9
- 238000010791 quenching Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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Abstract
The invention relates to an online induction heating superficial-layer hardening process and device after the outer thread processing of a pipe end, belonging to the technical field of geological drilling pipe machining. The invention has the technical scheme that the process comprises the following steps of: machining the end thread of a pipe on a lathe, retreating a cutting tool under the condition of motionless pipe, sheathing an induction coil at the threaded end of the pipe, and moving an induction mechanism to heat and shallowly harden the end thread of the pipe. The invention has the advantages that the hardening depth is 0.4-0.8 mm and does not 20% of the thickness of a thin-wall working piece, the hardening effect of the working piece is ensured, and the working piece is also ensured to have certain toughness; the induction mechanism is directly installed on the lathe and is simple and feasible, and the hardening effect can be effectively ensured; the problem of non-concentricity brought by secondary card mounting is avoided, and the evenness of the hardening layer can be ensured; and the device has reliable action and sensitive response, and the shallow hardening quality is ensured.
Description
Technical field
The present invention relates to the rear online induction heating shallow-layer hardening process of a kind of pipe end outside screw processing, belong to geological drilling pipe processing treatment technical field.
Background technology
At present, induction heating surface hardening technology has become ripe Technology, in the case-hardened component of needs are produced, extensively adopts.Due to three large effects (skin effect, sharp angle effect, approach effect) of high-frequency current, when tubing carries out induction heating, the depth of current penetration is darker than solid workpiece, thereby heat penetration is large.Conventional induction heating surface hardening thickness is greater than 0.8mm(and can reaches several millimeters of thickness as required), add heat-affected zone, more than the tissue thickness that changes of being heated reaches 1mm conventionally.May be darker in the situation that tube wall thickness is thinner.For the thinner tubing of wall ratio, because the depth of current penetration is large, adopt induction heating surface hardening to cause thicker partially hardened.This wishes to obtain in some cases.But be disadvantageous in other cases.Because hardened layer is relatively thick, make the out of proportion of steel pipe thin hardened layer and non-thin hardened layer, bring a series of adverse consequencess.
Geological drilling pipe long (3 meters or longer), pipe end needs machining screw to be connected to each other.Screw connection point is whole drilling rod weakest link, and the constantly wearing and tearing in cargo handling process repeatedly of this connecting thread, and aggravation weakens drill pipe work-ing life.In order to improve the life-span at screw thread position, if complete heat treatment sclerosis will occur that body toughness declines, strengthen and occur the drilling rod probability that fractures, be unfavorable for drilling operation, so be not easy to adopt complete heat treatment strengthening.While adopting surface strengthening, often adopt induction heating surface hardening, conventional induction heating technology is: inductor block is enclosed within to workpiece outside, workpiece slowly rotates that (workpiece velocity of rotation does not have specific requirement when various different workpieces heating quenching, but velocity of rotation is no more than per minute tens to be turned, conventionally being no more than 30 turns) and mobile, one section that needs are hardened moves through, obtains certain thickness heat hardening layer in inductor block.But for the drill pipe of wall thickness little (drill pipe is in the about 3mm of the wall thickness left and right of threaded portion), hardened layer is blocked up, makes hardened layer and non-hardened layer out of proportion, affects the performance of the non-hardened layer material of threaded interior, and then affects the drill pipe life-span.During drill pipe is produced at present, the situation of pipe end screw thread identical with matrix (treatment condition are the same) is many, although carry out end thread intensive treatment, existing problems are a lot: such as, hardenability is different, sclerosis thickness improper (above-mentioned hardened layer and non-hardened layer are out of proportion), sclerosis cost are higher, complex treatment process etc.
Summary of the invention
The object of the invention is to provide the rear online induction heating shallow-layer hardening process of a kind of pipe end outside screw processing, guarantees that the hardening effect of workpiece guarantees that again workpiece has certain toughness, simple and easy to do, effective, solves the problems referred to above that background technology exists.
Technical solution of the present invention is:
Online induction heating shallow-layer curing system after a kind of pipe end outside screw processing, comprise lathe chuck, induction heating transformer, inductor block, lathe big slide plate, lathe small slide plate and lathe saddle, lathe chuck, lathe big slide plate, lathe small slide plate and lathe saddle are engine lathe structure; Induction heating transformer is connected with inductor block, forms induction mechanism, is arranged on lathe small slide plate front end, and the rear end of lathe small slide plate is lathe saddle; Induction mechanism and lathe saddle can move forward and backward along small slide plate, and meanwhile, lathe small slide plate also can horizontally slip on lathe big slide plate; Lathe chuck is arranged on lathe big slide plate, and tubing to be processed is fixed by lathe chuck, adjusts lathe small slide plate and lathe saddle to machining position, and the cutter on lathe saddle cuts, and now, induction mechanism is in idle condition; After having cut, induction mechanism moves to working position, and inductor block is ruhmkorff coil, entangles the screw thread of the firm completion of processing of tubing, and lathe chuck drives tubing rotation, and inductor block moves by the speed of setting, and pipe end screw thread is implemented to heating quenching.
Online induction heating shallow-layer hardening process after a kind of pipe end outside screw processing, adopt above-mentioned induction heating shallow-layer curing system to carry out, comprise following steps: on lathe, process tubing end thread, then, in the situation that tubing is motionless, exit cutter, ruhmkorff coil is enclosed within to tubing thread end, mobile induction mechanism heats pipe end screw thread and shallow-layer sclerosis.
Described tubing is geological drilling pipe, length is more than 3 meters, on lathe, normal process end connecting thread, after screw thread machines, exits process tool, mobile induction mechanism, be enclosed within tubing thread end, use lathe chuck high speed rotating, tubing is rotated, induction mechanism along the moving axially of tubing, completes the heat hardening that tube surfaces shallow depth is no more than to 0.8mm in heating.
Hardening depth of the present invention is 0.4-0.8 millimeter, is no more than 20% of thin-wall workpiece thickness.Induction mechanism is directly installed on lathe; Tubing is by lathe chuck driven rotary, and speed is 80 revs/min; Tubing is after machining, directly carries out high-frequency induction heating, does not need secondary to be installed fixing.The all around of induction mechanism is moved by the program of lathe and is controlled.
Technical characterstic of the present invention and positively effect:
1. the high-frequency induction heating of background technology, hardening depth is more than 1 millimeter, and what have reaches several mm thick, and hardening depth of the present invention is 0.4-0.8 millimeter, be no more than 20% of thin-wall workpiece thickness, guarantee that the hardening effect of workpiece guarantees that again workpiece has certain toughness;
2. induction mechanism is directly installed on lathe, simple; The high-frequency induction heating of background technology needs special high-frequency quenching machine and larger high-frequency induction transformer;
3. moving forward and backward by the program of lathe of induction mechanism controlled, and the accurate positioning of induction coil and workpiece (tubing) can guarantee that workpiece is positioned at induction coil center;
4. tubing is by lathe chuck driven rotary, and speed is 80 revs/min, and the HF induction heating apparatus speed of rotation of background technology is no more than 20 revs/min, sometimes only has several turning; Point on some ruhmkorff coil corresponding to it of take on tubing screw thread is example, within the unit time, adopts the present invention, on screw thread click-through cross the frequency of putting on induction coil be background technology induction heating 4-40 doubly, can effectively guarantee hardening effect;
5. tubing is after machining, directly carries out high-frequency induction heating, does not need secondary to be installed fixing, the decentraction problem of having avoided secondary to be installed bringing, can guarantee hardened layer evenly;
6. induction mechanism moves left and right, also by the time variable control of lathe, can adopt according to different tubing the speed of different movements, translational speed is 50-200 centimeters/minute, and according to the variation of workpiece external diameter, adopt different translational speeds in induction heating process, reliable in action, is quick on the draw, and guarantees the quality of shallow-layer sclerosis.
Accompanying drawing explanation
Accompanying drawing 1 is embodiment of the present invention structural representation;
Accompanying drawing 2 is the embodiment of the present invention one tube wall shallow-layer sclerosis schematic diagram;
Accompanying drawing 3 is the embodiment of the present invention two tube wall shallow-layer sclerosis schematic diagram;
In figure: tubing 1, lathe chuck 2, induction heating transformer 3, inductor block 4, lathe big slide plate 5, lathe small slide plate 6, lathe saddle 7.
Embodiment
Below in conjunction with accompanying drawing, by embodiment, the present invention will be further described.
Online induction heating shallow-layer curing system after a kind of pipe end outside screw processing, comprise lathe chuck 2, induction heating transformer 3, inductor block 4, lathe big slide plate 5, lathe small slide plate 6 and lathe saddle 7, lathe chuck, lathe big slide plate, lathe small slide plate and lathe saddle are engine lathe structure; Induction heating transformer is connected with inductor block, forms induction mechanism, is arranged on lathe small slide plate front end, and the rear end of lathe small slide plate is lathe saddle; Induction mechanism and lathe saddle can move forward and backward along small slide plate, and meanwhile, lathe small slide plate also can horizontally slip on lathe big slide plate; Lathe chuck is arranged on lathe big slide plate, and tubing 1 to be processed is fixed by lathe chuck, adjusts lathe small slide plate and lathe saddle to machining position, and the cutter on lathe saddle cuts, and now, induction mechanism is in idle condition; After having cut, induction mechanism moves to working position, and inductor block is ruhmkorff coil, entangles the screw thread of the firm completion of processing of tubing, and lathe chuck drives tubing rotation, and inductor block moves by the speed of setting, and pipe end screw thread is implemented to heating quenching.
An online induction heating shallow-layer hardening process after the processing of pipe end outside screw, concrete steps:
1. according to the geological drilling mouth of pipe footpath of processing select the to match ruhmkorff coil of bore;
2. ruhmkorff coil is installed on lathe, is guaranteed the accuracy of installing;
3. after installing on lathe, finely tune, guarantee ruhmkorff coil center and lathe chuck central alignment, final argument is charged to lathe program;
4. geological drilling pipe is penetrated to the spindle hole of lathe, location, clamps with lathe chuck;
5. lathe saddle, along moving on lathe small slide plate, carries out thread turning to the end of geology drill pipe; Now induction mechanism is in idle condition;
6. turning is complete, and lathe saddle and ruhmkorff coil and induction heating transformer move down along lathe small slide plate simultaneously, makes ruhmkorff coil align geological drilling gas thread;
7. lathe small slide plate, to left movement, makes ruhmkorff coil entangle screw thread;
8. lathe chuck starts, and ruhmkorff coil energising moves right simultaneously, carries out induction heating, and surperficial shallow-layer high frequency is processed.
The effect of the embodiment of the present invention and data:
Index about the sclerosis of geological drilling gas thread has two: hardened layer hardness and thickness, and hardened layer hardness requirement is: more than HRC45; Thin hardened layer requires: 20% and the thickness difference that are no more than cross section, place wall thickness are no more than 0.1mm.
Accompanying drawing 2,3 is shown in the tube wall shallow-layer sclerosis of the embodiment of the present invention one, embodiment bis-.
The sclerosis hardness method that detects screw thread is: from embodiment mono-, embodiment bis-, respectively materials six, carry out Hardness Surveillance.The method of check screw thread thin hardened layer is: the wall thickness of intercepting embodiment mono-, embodiment bis-is the cross section of 3mm, carries out the check of thin hardened layer.
Embodiment mono-:
Cross section wall thickness: 3mm
Cross section thin hardened layer: minimum 0.47mm, is 0.52mm to the maximum
Ruhmkorff coil translational speed: 103.2cm/min
Workpiece (tubing) rotating speed: 80r/min
Hardened layer hardness: six section hardness are respectively HRC51, HRC52, HRC51, HRC52, HRC53, HRC51
Comprehensive above data: hardened layer maximum hardness is HRC53, and minimum value is HRC51, meet requirement more than HRC45, and hardened layer is more even
Thin hardened layer: 0.47/3=0.156=15.6%
0.52/3=0.173=17.3%
Thin hardened layer difference: 0.52-0.47=0.04mm
Thin hardened layer is over 20% of wall thickness, and thin hardened layer is more even, meets sclerosis requirement.
Embodiment bis-:
Cross section wall thickness: 3mm
Cross section thin hardened layer: minimum 0.49mm, is 0.53mm to the maximum
Induction coil translational speed: 120.3cm/min
Workpiece (tubing) rotating speed: 85r/min
Hardened layer hardness: six section hardness are respectively HRC49, HRC51, HRC51, HRC50, HRC50, HRC49
Comprehensive above data: hardened layer maximum hardness is HRC51, and minimum value is HRC49, meet requirement more than HRC45, and hardened layer is more even.
Thin hardened layer: 0.49/3=0.163=16.3%
0.53/3=0.176=17.6%
Thin hardened layer difference: 0.53-0.49=0.04
Thin hardened layer does not all surpass 20% of wall thickness, and thin hardened layer is more even, meets sclerosis requirement.
Claims (3)
1. a pipe end outside screw is processed rear online induction heating shallow-layer hardening process, it is characterized in that comprising following steps: adopt induction heating shallow-layer curing system to carry out, this device comprises lathe chuck (2), induction heating transformer (3), inductor block (4), lathe big slide plate (5), lathe small slide plate (6) and lathe saddle (7), induction heating transformer is connected with inductor block, form induction mechanism, be arranged on lathe small slide plate front end, the rear end of lathe small slide plate is lathe saddle; Induction mechanism and lathe saddle can move forward and backward along small slide plate, and meanwhile, lathe small slide plate also can horizontally slip on lathe big slide plate; Lathe chuck is arranged on lathe big slide plate, and tubing to be processed (1) is fixed by lathe chuck, adjusts lathe small slide plate and lathe saddle to machining position, cutter on lathe saddle cuts, on lathe, process tubing end thread, now, induction mechanism is in idle condition; After having cut, induction mechanism moves to working position, inductor block is ruhmkorff coil, in the situation that tubing is motionless, exit cutter, ruhmkorff coil is enclosed within to tubing thread end, lathe chuck drives tubing rotation, inductor block moves by the speed of setting, and mobile induction mechanism heats pipe end screw thread and shallow-layer sclerosis; Tubing is after machining, directly carries out high-frequency induction heating, does not need secondary to be installed fixing; Hardening depth is 0.4-0.8 millimeter, is no more than 20% of thin-wall workpiece thickness.
2. online induction heating shallow-layer hardening process after the processing of pipe end outside screw according to claim 1, it is characterized in that: described tubing is geological drilling pipe, length is more than 3 meters, normal process end connecting thread on lathe, after screw thread machines, exit process tool, mobile induction mechanism, be enclosed within tubing thread end, use lathe chuck high speed rotating, tubing is rotated, and induction mechanism along the moving axially of tubing, completes the heat hardening that tube surfaces shallow depth is no more than to 0.8mm in heating.
3. according to online induction heating shallow-layer hardening process after the pipe end outside screw processing described in claim 1 or 2, it is characterized in that: induction mechanism is directly installed on lathe; Tubing is by lathe chuck driven rotary, and speed is 80 revs/min; The all around of induction mechanism is moved by the program of lathe and is controlled.
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| CN201210435489.6A CN102912089B (en) | 2012-11-05 | 2012-11-05 | Online induction heating and shallow hardening process after outer thread processing of pipe end |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101148688A (en) * | 2006-09-19 | 2008-03-26 | 大连船用柴油机厂 | Surface hardening treatment method for large-power low-speed diesel engine piston bar |
| CN102355098A (en) * | 2011-10-12 | 2012-02-15 | 文登奥文电机有限公司 | High-frequency cast aluminium rotor surface treatment process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101148688A (en) * | 2006-09-19 | 2008-03-26 | 大连船用柴油机厂 | Surface hardening treatment method for large-power low-speed diesel engine piston bar |
| CN102355098A (en) * | 2011-10-12 | 2012-02-15 | 文登奥文电机有限公司 | High-frequency cast aluminium rotor surface treatment process |
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Denomination of invention: Online induction heating and shallow hardening process and device after outer thread processing of pipe end Effective date of registration: 20150922 Granted publication date: 20140326 Pledgee: Bank of Hebei Limited by Share Ltd Tangshan Fenghuang New Town Branch Pledgor: Tangshan Jinshi Super Abrasive Co., Ltd. Registration number: 2015990000801 |
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Date of cancellation: 20160930 Granted publication date: 20140326 Pledgee: Bank of Hebei Limited by Share Ltd Tangshan Fenghuang New Town Branch Pledgor: Tangshan Jinshi Super Abrasive Co., Ltd. Registration number: 2015990000801 |
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Denomination of invention: Online induction heating and shallow hardening process and device after outer thread processing of pipe end Effective date of registration: 20161019 Granted publication date: 20140326 Pledgee: Bank of Hebei Limited by Share Ltd Tangshan Fenghuang New Town Branch Pledgor: Tangshan Jinshi Super Abrasive Co., Ltd. Registration number: 2016990000879 |
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Date of cancellation: 20171018 Granted publication date: 20140326 Pledgee: Bank of Hebei Limited by Share Ltd Tangshan Fenghuang New Town Branch Pledgor: Tangshan Jinshi Super Abrasive Co., Ltd. Registration number: 2016990000879 |
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Denomination of invention: Online induction heating and shallow hardening process and device after outer thread processing of pipe end Effective date of registration: 20171025 Granted publication date: 20140326 Pledgee: Bank of Cangzhou Limited by Share Ltd Tangshan branch Pledgor: Tangshan Jinshi Super Abrasive Co., Ltd. Registration number: 2017990000987 |
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Address after: 064002 Cui Zhuangbei, Tangshan City Town, Fengrun District, Hebei Patentee after: Golden stone drilling (Tangshan) Limited by Share Ltd Address before: 064002 Cui Zhuangbei, Tangshan City Town, Fengrun District, Hebei Patentee before: Tangshan Jinshi Super Abrasive Co., Ltd. |
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Date of cancellation: 20181218 Granted publication date: 20140326 Pledgee: Bank of Cangzhou Limited by Share Ltd Tangshan branch Pledgor: Golden stone drilling (Tangshan) Limited by Share Ltd Registration number: 2017990000987 |
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Change date: 20181218 Registration number: 2017990000987 Pledgor after: Golden stone drilling (Tangshan) Limited by Share Ltd Pledgor before: Tangshan Jinshi Super Abrasive Co., Ltd. |