CN109988898A - A kind of cableway large-scale steel structure post weld heat treatment technique - Google Patents
A kind of cableway large-scale steel structure post weld heat treatment technique Download PDFInfo
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- CN109988898A CN109988898A CN201711481915.9A CN201711481915A CN109988898A CN 109988898 A CN109988898 A CN 109988898A CN 201711481915 A CN201711481915 A CN 201711481915A CN 109988898 A CN109988898 A CN 109988898A
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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
- C21D1/34—Methods of heating
- C21D1/40—Direct resistance heating
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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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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Abstract
1) a kind of cableway large-scale steel structure post weld heat treatment technique comprises the following steps that firstly, with the actual mass and heating speed of workpiece to calculate heating power, and heater chip is evenly distributed on workpiece；2) thermocouple is wrapped up tightly with thermal insulation material, connects long conducting wire and compensating wire is connect with temperature controller, and connects with the mains；3) when operating, workpiece is heated slowly between 500~600 DEG C with the speed of 30~50 DEG C/h；4) 1~2h is kept the temperature；5) 300 DEG C are cooled to hereinafter, then natural cooling in air again with the speed of 25~30 DEG C/h.Low Temperature Heat Treatment is carried out to cableway large-scale steel structure using this electrical heating method, it is short time limit, at low cost, it can reduce and eliminate the postwelding residual stress of cableway large-scale steel structure, improve the installation quality of aerial cableway, eliminate hidden danger, the service life for extending aerial cableway ensure that the safe operation of aerial cableway, improve business efficiency and social benefit.
Description
Technical field
The invention belongs to post weld heat treatment method and technology field, in particular at a kind of cableway large-scale steel structure postwelding heat
Science and engineering skill.
Background technique
Cableway, especially passenger aerial ropeway have developed rapidly in China, intermediate support, tension device in aerial cableway, driving
The large-scale steel structures such as driving frame, driving wheel and detour wheel body in the fabrication process, are bent, press, hammer and carry out due to passing through
A large amount of welding, can all generate residual stress.Especially in the welding process, under the action of heat source, local base material and filling
Material forms weld seam by fusing, metallurgical reaction, the processes such as crystallization, while also making to be subjected on the base material of weld seam two sides multiple
Miscellaneous thermal cycle is formed so-called " heat affected area ".Thus since the local heating of welding, rapid cooling, biggish welding become
Shape etc. produces biggish residual stress to large-scale steel structure.
Residual stress caused by this large-scale steel structure postwelding is a very important problem.Residual stress may
Some deformations are brought, when stress and serious deformation, normal mounting, use and the stress of equipment will be directly affected, even
It cracks and destroys, especially deform possible following consequence: (1) can make to drive wheel body and detour wheel body uneven, fortune
Abnormal voice can be generated when turning；(2) vertical axis of intermediate support can be made to deviate, cross-arm injustice, makes the supporting and pressing cable pulley wheel of installation
Groove center line is wandered off or is tilted, and wirerope is caused irregularly to run, and is led to the easy decable of wirerope or wheel liner irregular wear, is jeopardized
Personal safety；(3) tension device track deformation can be made, driving driving frame distortion makes driving machine operation generate bounce or get stuck, shadow
Ring the balance of steel wire rope tension.Consequence caused by these phenomenons will directly or indirectly influence the installation of cableway, run and make
With the service life, it is often more important that personal safety can be jeopardized.As it can be seen that residual stress caused by cableway large-scale steel structure postwelding, shadow
Loud and harmfulness is very big, it is sufficient to should cause the great attention of the relevant personnel.
No doubt, the metallurgical problems of welding heat affected zone, welded residual stress and Thermal Cycle are related, You Renshi
Figure is improved with adjustment Thermal Cycle.But and not all welded heat affected area problem and existing remnants
Stress can solve by adjusting thermal cycle.Simultaneously because the transport of large scale structure steel is more difficult, welded at the scene
After be heat-treated it is the most appropriate.Thus, carry out one of post weld heat treatment as guarantee cableway large-scale steel structure manufacture installation quality
Key measures have caused people and have more and more paid attention to.
Summary of the invention
The present invention is that there are abundant residues stress and deformations for cableway large-scale steel structure postwelding present in solution well-known technique
The technical issues of and a kind of cableway large-scale steel structure post weld heat treatment technique is provided.
The technical scheme adopted by the present invention to solve the technical problems existing in the known art is that a kind of cableway Large Steel
Structure post weld heat treatment technique, comprises the following steps that
1) firstly, calculating heating power with the actual mass and heating speed of workpiece, wherein heater power P=[C*Q* ⊿ t*
(1+K)]/(0.24*3600), in formula: the specific heat of C- steel；Then K- heat loss coefficient is counted according to heater every power
Heater the piece number used in calculating, and heater chip is evenly distributed on workpiece；
2) thermocouple is wrapped up tightly with thermal insulation material, is connect by spreading conducting wire and compensating wire with temperature controller, and connect electricity
Source；
3) when operating, workpiece is heated slowly between 500~600 DEG C with the speed of 30~50 DEG C/h；
4) 1~2h is kept the temperature；
5) 300 DEG C are cooled to hereinafter, then natural cooling in air again with the speed of 25~30 DEG C/h.
The present invention can also adopt the following technical scheme that the heater is tracklayer heater.
The power supply is powered using special rectifier transformer, and the special rectifier transformer and high-power stabilization pressure device connect
It connects.
The advantages and positive effects of the present invention are: the present invention using this electrical heating method to cableway large-scale steel structure into
Row Low Temperature Heat Treatment, it is short time limit, at low cost, the postwelding residual stress of cableway large-scale steel structure can be reduced and be eliminated, is improved
The installation quality of aerial cableway, eliminates hidden danger, extends the service life of aerial cableway, ensure that the safety fortune of aerial cableway
Row, improves business efficiency and social benefit.
Specific embodiment
Embodiment one:
A kind of cableway large-scale steel structure post weld heat treatment technique, comprises the following steps that
1) firstly, calculating heating power with the actual mass and heating speed of workpiece, for example, workpiece weight Q=1.92t, heating speed
T=50 DEG C Du ⊿/h, then needed for heater power: P=[C*Q* ⊿ t* (1+K)]/(0.24*3600)=(0.16*19200*50) *
(1+0.3)/(0.24*3600)=242.7KW, in formula: the specific heat of C- steel；K- heat loss coefficient, because of tracklayer heater every
10KW, so being evenly distributed on the workpiece sling using lifting equipment using 25；
2) thermocouple is wrapped up tightly with thermal insulation material, is connect by spreading conducting wire and compensating wire with temperature controller, and connect electricity
Source；
3) when operating, workpiece is heated slowly between 500~600 DEG C with the speed of 30~50 DEG C/h；
4) 1~2h is kept the temperature；
5) 300 DEG C are cooled to hereinafter, then natural cooling in air again with the speed of 25~30 DEG C/h.
Embodiment two:
A kind of cableway large-scale steel structure post weld heat treatment technique, comprises the following steps that
1) firstly, calculating heating power with the actual mass and heating speed of workpiece, for example, workpiece weight Q=1.92t, heating speed
T=50 DEG C Du ⊿/h, then needed for heater power: P=[C*Q* ⊿ t* (1+K)]/(0.24*3600)=(0.16*19200*50) *
(1+0.3)/(0.24*3600)=242.7KW, in formula: the specific heat of C- steel；K- heat loss coefficient, because of tracklayer heater every
10KW, so being evenly distributed on the workpiece sling using lifting equipment using 25；
2) thermocouple is wrapped up tightly with thermal insulation material, is connect by spreading conducting wire and compensating wire with temperature controller, and connect electricity
Source；
3) when operating, workpiece is heated slowly between 500 DEG C with the speed of 30 DEG C/h；
4) 1h is kept the temperature；
5) 300 DEG C are cooled to hereinafter, then natural cooling in air again with the speed of 25/h.
Embodiment three:
A kind of cableway large-scale steel structure post weld heat treatment technique, comprises the following steps that
1) firstly, calculating heating power with the actual mass and heating speed of workpiece, for example, workpiece weight Q=1.92t, heating spray
After zinc, aluminium (coated porous gap), seal coat is brushed in time.Time interval must not exceed 5h.After Seal treatment, Ying Youyi
Fixed curing time, guarantee coating do solid work, without holiday, no sag, without be bubbled, pollution-free impurity, thickness, adhesive force conform to
It asks.
Step 7: quality testing
Including (see the 5th steps) such as visual examination, thickness check and anchoring strength of coating (bonding force).
Step 8: site clearing, completion
Capital equipment used in present invention process includes: air compressor machine, spray gun, oil water separator, ventilation equipment, power supply, high pressure
Airless sprayer, dehumidifier, air blower, blender, viscosimeter, dry humidity instrument, calibrator, adhesive force detection instrument and air
Purification device etc..The binding force for adopting the composite coating and steel construction matrix being obtained by the present invention averagely can reach
12.0Mpa, is higher than national standard, and service life reaches 80 years or more.
T=50 DEG C Su Du ⊿/h, then needed for heater power: P=[C*Q* ⊿ t* (1+K)]/(0.24*3600)=(0.16*
19200*5
0) * (1+0.3)/(0.24*3600)=242.7KW, in formula: the specific heat of C- steel；K- heat loss coefficient, because crawler type heats
Device is every
Piece 10KW, so being evenly distributed on the workpiece sling using lifting equipment using 25；
2) thermocouple is wrapped up tightly with thermal insulation material, is connect by spreading conducting wire and compensating wire with temperature controller, and connect electricity
Source；
3) when operating, workpiece is heated slowly between 600 DEG C with the speed of 30 DEG C/h；
4) 1h is kept the temperature；
5) 300 DEG C are cooled to hereinafter, then natural cooling in air again with the speed of 25/h.
Example IV:
A kind of cableway large-scale steel structure post weld heat treatment technique, comprises the following steps that
1) firstly, calculating heating power with the actual mass and heating speed of workpiece, for example, workpiece weight Q=1.92t, heating speed
T=50 DEG C Du ⊿/h, then needed for heater power: P=[C*Q* ⊿ t* (1+K)]/(0.24*3600)=(0.16*19200*50) *
(1+0.3)/(0.24*3600)=242.7KW, in formula: the specific heat of C- steel；K- heat loss coefficient, because of tracklayer heater every
10KW, so being evenly distributed on the workpiece sling using lifting equipment using 25；
2) thermocouple is wrapped up tightly with thermal insulation material, is connect by spreading conducting wire and compensating wire with temperature controller, and connect electricity
Source；
3) when operating, workpiece is heated slowly between 500 DEG C with the speed of 30 DEG C/h；
4) 2h is kept the temperature；
5) 300 DEG C are cooled to hereinafter, then natural cooling in air again with the speed of 25/h.
Embodiment five:
A kind of cableway large-scale steel structure post weld heat treatment technique, comprises the following steps that
1) firstly, calculating heating power with the actual mass and heating speed of workpiece, for example, workpiece weight Q=1.92t, heating speed
T=50 DEG C Du ⊿/h, then needed for heater power: P=[C*Q* ⊿ t* (1+K)]/(0.24*3600)=(0.16*19200*50) *
(1+0.3)/(0.24*3600)=242.7KW, in formula: the specific heat of C- steel；K- heat loss coefficient, because of tracklayer heater every
10KW, so being evenly distributed on the workpiece sling using lifting equipment using 25；
2) thermocouple is wrapped up tightly with thermal insulation material, is connect by spreading conducting wire and compensating wire with temperature controller, and connect electricity
Source；
3) when operating, workpiece is heated slowly between 600 DEG C with the speed of 30 DEG C/h；
4) 2h is kept the temperature；
5) 300 DEG C are cooled to hereinafter, then natural cooling in air again with the speed of 25/h.
Embodiment six:
A kind of cableway large-scale steel structure post weld heat treatment technique, comprises the following steps that
1) firstly, calculating heating power with the actual mass and heating speed of workpiece, for example, workpiece weight Q=1.92t, heating speed
T=50 DEG C Du ⊿/h, then needed for heater power: P=[C*Q* ⊿ t* (1+K)]/(0.24*3600)=(0.16*19200*50) *
(1+0.3)/(0.24*3600)=242.7KW, in formula: the specific heat of C- steel；K- heat loss coefficient, because of tracklayer heater every
10KW, so being evenly distributed on the workpiece sling using lifting equipment using 25；
2) thermocouple is wrapped up tightly with thermal insulation material, is connect by spreading conducting wire and compensating wire with temperature controller, and connect electricity
Source；
3) when operating, workpiece is heated slowly between 600 DEG C with the speed of 30 DEG C/h；
4) 1.5h is kept the temperature；
5) 300 DEG C are cooled to hereinafter, then natural cooling in air again with the speed of 25/h.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, the art
Those of ordinary skill, within the essential scope of the present invention, the variations, modifications, additions or substitutions made all should belong to the present invention
It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, described in above embodiments and description
Merely illustrate the principles of the invention, without departing from the spirit and scope of the present invention, the present invention also has various change
And improvement, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended
Claims and its equivalent thereof.
Claims (3)
1. a kind of cableway large-scale steel structure post weld heat treatment technique, which is characterized in that comprise the following steps that
1) firstly, calculating heating power with the actual mass and heating speed of workpiece, wherein heater power P=[
C*Q* ⊿ t* (1+K)]/(0.24*3600), in formula: the specific heat of C- steel；K- heat loss coefficient, it is then every according to heater
Heater chip is evenly distributed on workpiece by the power of piece come heater the piece number used in calculating；
2) thermocouple is wrapped up tightly with thermal insulation material, is connect by spreading conducting wire and compensating wire with temperature controller, and connect electricity
Source；
3) when operating, workpiece is heated slowly between 500~600 DEG C with the speed of 30~50 DEG C/h；
4) 1~2h is kept the temperature；
5) 300 DEG C are cooled to hereinafter, then natural cooling in air again with the speed of 25~30 DEG C/h.
2. a kind of cableway large-scale steel structure post weld heat treatment technique according to claim 1, which is characterized in that the heating
Device is tracklayer heater.
3. a kind of cableway large-scale steel structure post weld heat treatment technique according to claim 1, which is characterized in that the power supply
It is powered using special rectifier transformer, the special rectifier transformer is connect with high-power stabilization pressure device.
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| CN201711481915.9A CN109988898A (en) | 2017-12-29 | 2017-12-29 | A kind of cableway large-scale steel structure post weld heat treatment technique |
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| CN201711481915.9A CN109988898A (en) | 2017-12-29 | 2017-12-29 | A kind of cableway large-scale steel structure post weld heat treatment technique |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111172382A (en) * | 2020-01-16 | 2020-05-19 | 燕山大学 | Bar induction heat processing technique |
-
2017
- 2017-12-29 CN CN201711481915.9A patent/CN109988898A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111172382A (en) * | 2020-01-16 | 2020-05-19 | 燕山大学 | Bar induction heat processing technique |
| CN111172382B (en) * | 2020-01-16 | 2021-03-26 | 燕山大学 | Bar induction heat processing technique |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190709 |
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| WD01 | Invention patent application deemed withdrawn after publication |