CN106346200A - Production process of precision square tube for steel structure - Google Patents
Production process of precision square tube for steel structure Download PDFInfo
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- CN106346200A CN106346200A CN201610843808.5A CN201610843808A CN106346200A CN 106346200 A CN106346200 A CN 106346200A CN 201610843808 A CN201610843808 A CN 201610843808A CN 106346200 A CN106346200 A CN 106346200A
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- square tube
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a production process of a precision square tube for a steel structure. The production process comprises steps as follows: step 1, process design is customized, a special tube blank is selected, and a square tube meeting the set requirements is obtained with a dieless drawing deformation process; step 2, the tube blank is subjected to heat treatment in protective inert gas in a heat treatment furnace after treatment in the step 1 is completed; step 4, the square tube subjected to precision grinding is put in a lubrication groove for surface lubricating treatment; step 5, the square tube obtained in the step 4 is detected, metered and packaged after being qualified. Compared with a conventional production process, the production process of the precision square tube for the steel structure has the advantages that the quality consistency of square tubes produced with the process is effectively improved, the safety of the square tubes meet the standard of foreign imported square tubes, the square tubes have excellent stain resistance and corrosion resistance and can adapt to the constantly changing external working environment for a long time, and the service life of the national square tubes is prolonged.
Description
Technical field
The present invention relates to steel construction square tube production technical field, produce work particularly to a kind of steel construction with accurate square tube
Skill.
Background technology
In the square tube currently used for structural steelwork, because steel construction is exposed to the external environment for a long time, external environment
Temperature change is frequent and thermograde larger it is impossible to heat stability and the safety of square tube is effectively ensured, simultaneously as
The great majority of square tube are q235 cold-strip steel material, and its decay resistance is poor, perishable in long-term external environment get rusty,
Lead to square tube can not adapt to the change of working environment completely.At home, existing square tube is all to be produced by Sheet Metal Forming Technology, this side
Method gradually do not adapted to modern industry to square tube performance and produce requirement, the particularly manufacture of some special alloy square tubes,
Conventional ones technique percent defective is higher, and work efficiency is relatively low, and the quality consistency of the product obtaining is poor, and these shortcomings result in
The square tube of domestic production generally belongs to low and middle-grade products, in order to guarantor's pipe has satisfactory thermal stability and safety
Performance is it has to select the excellent square tube of the optional energy of expensive import square tube, this undoubtedly makes to be added significantly to put into into
This.
Content of the invention
The goal of the invention of the present invention is: for above-mentioned problem, provides a kind of steel construction precision square tube to produce
Technique, to solve above-mentioned problem.
The technical solution used in the present invention is as follows: a kind of steel construction precision square tube production technology, comprises the following steps:
Step 1, customization technological design, from extraordinary pipe, obtain the square tube of sets requirement using automobile rearspring deformation technique；
After the completion of step 2, step 1, in heat-treatment furnace, in inertia protective gas, heat treatment is carried out to pipe；
After the completion of step 3, heat treatment, accurate grinding is carried out to the square tube obtaining, obtain satisfactory square tube；
Step 4, the square tube after accurate grinding is put in lubrication groove, carry out surface lubrication process, lubrication time is 3h, wherein moistens
Synovial fluid is steam turbine oil, and steam turbine oil is contained within 10wt% oil-soluble organocopper compound；
Step 5, the square tube that step 4 obtains is detected, qualified rear metering packing.
Further it is contemplated that pipe is when being drawn to finished product square tube, pulling capacity is larger, and product surface is easily pulled, finished product
The problems such as square tube precision is difficult precise control, in step 1, automobile rearspring deformation technique adopts 3 passage stretchings, total section shrinkage rate
According to formula r=1-(a+b)/ab(a and b represent length and the width of product square tube respectively) draw, other passage section shrinkage rate foundations
Total section shrinkage rate and existing formula obtain.
In order to be further ensured that the quality of production tube, in step 2, heat treatment specifically comprises the processes of: square tube is placed in heat treatment
In stove under 1-2mpa, inertia protective gas is heated to less than 700-800 DEG C, heating rate control 110-120 DEG C/
H, temperature retention time is 0.5-2h, when then cooling to 50 DEG C with the furnace, takes out air cooling.
Further, make finished product square tube have preferably outer firmly interior tough performance, after the completion of step 4, also need square tube is carried out
Cold treatment, its cold treatment temperature is -80-(-90) DEG C, also need after the completion of cold treatment to carry out lonneal process.
Further, lonneal processes and carries out under the inert gas shielding of 1-2mpa, and temperature is 230-260 DEG C,
Temperature retention time is 0.5-1h.
In sum, due to employing technique scheme, the invention has the beneficial effects as follows:
1st, adopt automobile rearspring deformation technique and adopt 3 passages to stretch, it is to avoid pulling capacity is larger, product surface easily pulls,
So that technique is simpler, special Technology for Heating Processing ensure that for the appearance of the problems such as finished product square tube precision is difficult precise control
The physical characteristics of accurate square tube material, eliminate the stress that produces because of drawing processing, after accurate grinding so as to get tight
Close square tube dimensional structure is more stable；
2nd, while surface lubrication being carried out to accurate square tube, by impregnating a small amount of copper, improve the cause on accurate square tube surface
Density and anti-pollution characteristic, one layer of fine and close copper oxide with nanostructured that accurate square tube is formed, enhance accurate square tube
Decay resistance；Meanwhile, cold treatment is carried out to the square tube after surface lubrication, remaining austenite in square tube can be eliminated, disappear
Except the internal stress in square tube, improve the performances such as the wearability of square tube, hardness, contact fatigue strength, in addition, remaining eliminating
During austenite, when being changed into martensite, the contraction of volume is more conducive to oozing of the copper oxide of nanostructured to austenite
Enter, further increase consistency, anti-pollution characteristic and the decay resistance on square tube surface；
3rd, the present invention steel construction precision square tube production technology compared with traditional processing technology, the uniform quality of the square tube of production
Property is effectively improved, and the safety of square tube has reached the standard of external import square tube, has outstanding anti-pollution characteristic and resistance to
Corrosive nature, enables square tube to be adapted to the working environment that outside is continually changing for a long time, improves the service life of domestic square tube.
Specific embodiment
With reference to embodiment, the present invention is described in detail.
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with preferred embodiment, to this
Invention is further elaborated.It should be appreciated that particular preferred embodiment described herein is only in order to explain the present invention,
It is not intended to limit the present invention.
Embodiment one
The steel construction of a kind of photocell external diameter 7.0mm × 7.0mm, wall thickness 0.6mm precision square tube production technology, including following
Step:
Step 1, customization technological design, from extraordinary pipe, repeatedly cold rolling again after hot extrusion after reach formation finished product square tube and require
Size, then obtain the square tube of sets requirement using automobile rearspring deformation technique, wherein carry out the stretching of 3 passages, total section
Decrement r=1-(a+b)/ab=0.714, other passage section shrinkage rates according to total section shrinkage rate and existing formula obtain for
0.485；
After the completion of step 2, step 1, heat treatment is carried out to square tube, square tube is placed in heat-treatment furnace under 1mpa, in argon etc.
It is heated to 720 DEG C, heating rate controls in 110 DEG C/h, temperature retention time is 1.5h, then furnace cooling in inertia protective gas
During to 50 DEG C, take out air cooling, obtain the square tube after heat treatment；
After the completion of step 3, heat treatment, accurate grinding is carried out to the square tube obtaining, obtain satisfactory square tube；
Step 4, the square tube after accurate grinding is put in lubrication groove, carry out surface lubrication process, lubrication time is 3h, wherein moistens
Synovial fluid is steam turbine oil, and steam turbine oil is contained within 10wt% oil-soluble organocopper compound；
Step 5, the square tube that step 4 obtains is detected, qualified rear metering packing.
Embodiment two
A kind of steel construction of photocell external diameter 7.0mm × 10.0mm, wall thickness 0.8mm with accurate square tube production technology, including with
Lower step:
Step 1, customization technological design, from extraordinary pipe, repeatedly cold rolling again after hot extrusion after reach formation finished product square tube and require
Size, then obtain the square tube of sets requirement using automobile rearspring deformation technique, wherein carry out the stretching of 3 passages, total section
Decrement r=1-(a+b)/ab=0.757, other passage section shrinkage rates according to total section shrinkage rate and existing formula obtain for
0.493；
After the completion of step 2, step 1, heat treatment is carried out to square tube, square tube is placed in heat-treatment furnace under 1mpa, in argon etc.
It is heated to 720 DEG C, heating rate controls in 110 DEG C/h, temperature retention time is 1.5h, then furnace cooling in inertia protective gas
During to 50 DEG C, take out air cooling, obtain the square tube after heat treatment；
After the completion of step 3, vacuum heat, accurate grinding is carried out to the square tube obtaining, obtain the square tube meeting dimensional requirement；
Step 4, the square tube after accurate grinding is put in lubrication groove, carry out surface lubrication process, lubrication time is 3h, wherein moistens
Synovial fluid is steam turbine oil, and steam turbine oil is contained within 10wt% oil-soluble organocopper compound；
Step 5, the square tube after surface lubrication is carried out with cold treatment, cold treatment temperature is -85 DEG C；
Square tube after step 6, cleaning cold treatment, then carries out lonneal, lonneal is processed at 240 DEG C to square tube
Carry out under the inert gas shielding of 2mpa, temperature retention time is 0.5h, cools to room temperature with the furnace, obtains finished product square tube；
Step 7, finished product square tube is detected, qualified rear metering packing.
Embodiment three
A kind of steel construction of photocell external diameter 10.0mm × 13.0mm, wall thickness 1.0mm with accurate square tube production technology, including with
Lower step:
Step 1, customization technological design, from extraordinary pipe, repeatedly cold rolling again after hot extrusion after reach formation finished product square tube and require
Size, then obtain the square tube of sets requirement using automobile rearspring deformation technique, wherein carry out the stretching of 3 passages, total section
Decrement r=1-(a+b)/ab=0.823, other passage section shrinkage rates according to total section shrinkage rate and existing formula obtain for
0.476；
After the completion of step 2, step 1, heat treatment is carried out to square tube, square tube is placed in heat-treatment furnace under 1mpa, in argon etc.
It is heated to 700 DEG C, heating rate controls in 120 DEG C/h, temperature retention time is 2h, then cools to the furnace in inertia protective gas
When 50 DEG C, take out air cooling, obtain the square tube after heat treatment；
After the completion of step 3, heat treatment, accurate grinding is carried out to the square tube obtaining, obtain the square tube meeting dimensional requirement；
Step 4, the square tube after accurate grinding is put in lubrication groove, carry out surface lubrication process, lubrication time is 3h, wherein moistens
Synovial fluid is steam turbine oil, and steam turbine oil is contained within 10wt% oil-soluble organocopper compound；
Step 5, the square tube after surface lubrication is carried out with cold treatment, cold treatment temperature is -80 DEG C；
Square tube after step 6, cleaning cold treatment, then carries out lonneal, lonneal is processed at 230 DEG C to square tube
Carry out under the inert gas shielding of 1mpa, temperature retention time is 1h, cools to room temperature with the furnace, obtains finished product square tube；
Step 7, finished product square tube is detected, qualified rear metering packing.
Example IV
A kind of steel construction of photocell external diameter 10.0mm × 20.0mm, wall thickness 1.0mm with accurate square tube production technology, including with
Lower step:
Step 1, customization technological design, from extraordinary pipe, repeatedly cold rolling again after hot extrusion after reach formation finished product square tube and require
Size, then obtain the square tube of sets requirement using automobile rearspring deformation technique, wherein carry out the stretching of 3 passages, total section
Decrement r=1-(a+b)/ab=0.85, other passage section shrinkage rates according to total section shrinkage rate and existing formula obtain for
0.473；
After the completion of step 2, step 1, heat treatment is carried out to square tube, square tube is placed in heat-treatment furnace under 2mpa, in argon etc.
It is heated to 800 DEG C, heating rate controls in 110 DEG C/h, temperature retention time is 0.5h, then furnace cooling in inertia protective gas
During to 50 DEG C, take out air cooling, obtain the square tube after heat treatment；
After the completion of step 3, heat treatment, accurate grinding is carried out to the square tube obtaining, obtain the square tube meeting dimensional requirement；
Step 4, the square tube after accurate grinding is put in lubrication groove, carry out surface lubrication process, lubrication time is 3h, wherein moistens
Synovial fluid is steam turbine oil, and steam turbine oil is contained within 10wt% oil-soluble organocopper compound；
Step 5, the square tube after surface lubrication is carried out with cold treatment, cold treatment temperature is -90 DEG C；
Square tube after step 6, cleaning cold treatment, then carries out lonneal, lonneal is processed at 260 DEG C to square tube
Carry out under the inert gas shielding of 2mpa, temperature retention time is 0.5h, cools to room temperature with the furnace, obtains finished product square tube；
Step 7, finished product square tube is detected, qualified rear metering packing.
After testing, finished product square tube flatness is good for the finished product square tube that above-described embodiment obtains, at 50 DEG C, the hot sulphuric acid of 15wt%
After soaking 10 days, square tube surface Non Apparent Abnormality, there is outstanding corrosion resistance and anti-pollution characteristic, its heat stability is good, reaches
The security performance standard of external import square tube, the square tube of the present invention can be adapted to the building ring that outside is continually changing for a long time
Border, service life is longer than existing domestic square tube.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (4)
1. a kind of steel construction precision square tube production technology is it is characterised in that comprise the following steps:
Step 1, customization technological design, from extraordinary pipe, obtain the square tube of sets requirement using automobile rearspring deformation technique；
After the completion of step 2, step 1, in heat-treatment furnace, in inertia protective gas, heat treatment is carried out to pipe；
After the completion of step 3, heat treatment, accurate grinding is carried out to the square tube obtaining, obtain satisfactory square tube；
Step 4, the square tube after accurate grinding is put in lubrication groove, carry out surface lubrication process, lubrication time is 3h, wherein moistens
Synovial fluid is steam turbine oil, and steam turbine oil is contained within 10wt% oil-soluble organocopper compound；
Step 5, the square tube that step 4 obtains is detected, qualified rear metering packing.
2. the accurate square tube production technology of steel construction as claimed in claim 1 is it is characterised in that in step 2, heat treatment is concrete
Technique is: square tube is placed in heat-treatment furnace under 1-2mpa, in inertia protective gas, is heated to less than 700-800 DEG C,
Heating rate controls in 110-120 DEG C/h, and temperature retention time is 0.5-2h, when then cooling to 50 DEG C with the furnace, takes out air cooling.
3. the accurate square tube production technology of steel construction as claimed in claim 1 is it is characterised in that after the completion of step 4, it is right also to need
Square tube carries out cold treatment, and its cold treatment temperature is -80-(-90) DEG C, also need after the completion of cold treatment to carry out lonneal process.
4. steel construction as claimed in claim 3 uses accurate square tube production technology it is characterised in that lonneal is processed in 1-
Carry out under the inert gas shielding of 2mpa, temperature is 230-260 DEG C, temperature retention time is 0.5-1h.
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| CN201610843808.5A CN106346200B (en) | 2016-09-23 | 2016-09-23 | A kind of accurate square tube production technology of steel construction |
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| CN201610843808.5A CN106346200B (en) | 2016-09-23 | 2016-09-23 | A kind of accurate square tube production technology of steel construction |
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| CN106346200A true CN106346200A (en) | 2017-01-25 |
| CN106346200B CN106346200B (en) | 2018-10-16 |
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Citations (6)
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|---|---|---|---|---|
| JP2005103595A (en) * | 2003-09-30 | 2005-04-21 | Nisshin Steel Co Ltd | Method for manufacturing square electric resistance welded steel tube for frame of color picture tube |
| CN104607475A (en) * | 2015-01-24 | 2015-05-13 | 重庆西重特种铝业有限公司 | Machining process of aluminum alloy rectangular pipe |
| CN104928596A (en) * | 2015-05-16 | 2015-09-23 | 王文姣 | High-strength automobile frame and manufacturing method thereof |
| CN105176638A (en) * | 2015-06-30 | 2015-12-23 | 上海禾泰特种润滑科技股份有限公司 | Chain lubricating oil composite agent and preparation method thereof |
| CN105312354A (en) * | 2015-12-02 | 2016-02-10 | 重庆西重特种铝业有限公司 | Production method of rectangular aluminum alloy pipe |
| CN105562456A (en) * | 2015-12-03 | 2016-05-11 | 中铝洛阳铜业有限公司 | Preparation process of red copper square pipe material |
-
2016
- 2016-09-23 CN CN201610843808.5A patent/CN106346200B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005103595A (en) * | 2003-09-30 | 2005-04-21 | Nisshin Steel Co Ltd | Method for manufacturing square electric resistance welded steel tube for frame of color picture tube |
| CN104607475A (en) * | 2015-01-24 | 2015-05-13 | 重庆西重特种铝业有限公司 | Machining process of aluminum alloy rectangular pipe |
| CN104928596A (en) * | 2015-05-16 | 2015-09-23 | 王文姣 | High-strength automobile frame and manufacturing method thereof |
| CN105176638A (en) * | 2015-06-30 | 2015-12-23 | 上海禾泰特种润滑科技股份有限公司 | Chain lubricating oil composite agent and preparation method thereof |
| CN105312354A (en) * | 2015-12-02 | 2016-02-10 | 重庆西重特种铝业有限公司 | Production method of rectangular aluminum alloy pipe |
| CN105562456A (en) * | 2015-12-03 | 2016-05-11 | 中铝洛阳铜业有限公司 | Preparation process of red copper square pipe material |
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Effective date of registration: 20190703 Address after: Room 1514, No. 275 Xintuo Road, Daxie Development Zone, Ningbo City, Zhejiang Province Patentee after: Longyuan Mingzhu Science and Technology Co., Ltd. Address before: 610000 Wuhou District Wuhou new town administrative committee, Chengdu, Sichuan, 2 Wuyi East Road 15, 1 units, 2 level 231. Patentee before: CHENGDU JIUSHIDU INDUSTRIAL PRODUCT DESIGN CO., LTD. |