CN108103298A - A kind of screw-thread steel adapter heat treatment method - Google Patents
A kind of screw-thread steel adapter heat treatment method Download PDFInfo
- Publication number
- CN108103298A CN108103298A CN201810133487.9A CN201810133487A CN108103298A CN 108103298 A CN108103298 A CN 108103298A CN 201810133487 A CN201810133487 A CN 201810133487A CN 108103298 A CN108103298 A CN 108103298A
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- China
- Prior art keywords
- screw
- thread steel
- steel adapter
- heat treatment
- thread
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/607—Molten salts
Abstract
Present invention is disclosed a kind of screw-thread steel adapter heat treatment methods, include the following steps：Cast screw-thread steel adapter；Screw-thread steel adapter blank is machined out and leaves heat treatment deformation amount；Screw-thread steel adapter finishes；Screw-thread steel adapter is sent into the full-automatic salt quenching equipment under atmosphere protection and computer control；After being heated to 830 DEG C~920 DEG C heat preservation 1 it is small when~2 it is small when carry out austenitizing processing；After putting into the salt bath of full-automatic salt quenching equipment salt bath furnace and being cooled to 280 DEG C~350 DEG C rapidly heat preservation 2 it is small when~3 it is small when carry out same temperature hardening heat treatment；It is washed under normal temperature condition；Isothermal hardening screw-thread steel adapter finished product is obtained after drying.Screw-thread steel adapter after the present invention is heat-treated, hardness can reach 320 HB~380HB, and tensile strength can reach 900MPa~1200MPa, and the relatively 45 steel adapter intensity of tradition with size improves more than 20%；Further, since the density ratio steel of spheroidal graphite cast-iron is low, weight also mitigates about 8%, and wearability enhances, and service life extends.
Description
Technical field
The present invention relates to a kind of heat treatment methods, and in particular to a kind of heat treatment method of screw-thread steel adapter belongs to gold
Belong to material processing field.
Background technology
In architecture production field, the problem of needing two spirals interconnections is frequently encountered, spiral continues
It is a kind of construction method common in architectural engineering to connect, and traditional technology is that the end of two spirals is weldingly fixed on one
It rises, when reinforcement welding is needed using welding equipment, and construction site is generally required in working at height mostly, by construction site space
Limitation, it is difficult using welding equipment, while electric welding spark etc. is there are huge security risk, and the interface welded is not firm enough
Gu getting rusty easily, desoldering, this kind of technology disables substantially.The spiral docking generally use screw connection manner of the prior art
It carries out, i.e., screwed connector is welded in the end of reinforcing bar waiting or directly processes spiral shell in the end of reinforcing bar waiting
Line, then the end of thread of two reinforcing bars waiting and the both ends of same telescopic steel bar connector are spirally connected, above-mentioned telescopic steel
The material of muscle adapter is usually 45 steel.
Because of the hardness and low cross-intensity of traditional 45 steel screw thread adapters, and in high-building construction, mostly using straight
Footpath is more than 25 millimeters of spiral, and when traditional 45 steel screw thread adapters are with large-diameter thread steel bar joining, be spirally connected mistake after testing
Effect position is often happened at 45 steel screw thread adapter internal whorls or at its screw thread welding with bar connecting and screw thread process
Place, common failure phenomenon has thread surface to pull, debentition breakage etc., which further results in 45 steel screw thread adapters and resist
Tensile strength reduces, it is impossible to meet the requirement of high-building construction.
In conclusion how to overcome drawbacks described above, design and a kind of do not changing the feelings of the original size of screw-thread steel adapter
The heat treatment method of screw-thread steel adapter performance can be improved under condition, is made with the continued access for meeting large-diameter thread steel in skyscraper
With operating mode, just become the technical issues of staff in the art is urgently to be resolved hurrily.
The content of the invention
In view of the prior art is there are drawbacks described above, for this purpose, the present invention provides a kind of screw-thread steel adapter heat treatment method, with
It solves the problems, such as above-mentioned at least one.
The purpose of the present invention will be achieved by the following technical programs：
Present invention is disclosed a kind of heat treatment methods of screw-thread steel adapter, include the following steps：
(1) satisfactory screw-thread steel adapter is cast；
(2) after casting, screw-thread steel adapter blank is machined out, when machining leaves heat treatment deformation amount；
(3) the screw-thread steel adapter after machining is finished, obtains screw-thread steel adapter semi-finished product；
(4) the screw-thread steel adapter semi-finished product after finishing are sent to the full-automatic salt hardening under atmosphere protection and computer control
In equipment；
(5) in the heating furnace of full-automatic salt quenching equipment, when heat preservation 1 is small after screw-thread steel adapter is heated to 830 DEG C~920 DEG C
~2 carry out austenitizing processing when small；
(6) step (5) austenitizing will be passed through treated that screw-thread steel adapter puts into full-automatic salt quenching equipment salt bath furnace
Salt bath in, after being cooled to 280 DEG C~350 DEG C rapidly in salt bath keep the temperature 2 it is small when~3 it is small when carry out same temperature hardening heat treatment；
(7) screw-thread steel adapter from salt bath furnace is taken out, washed with water under room temperature；
(8) isothermal hardening screw-thread steel adapter finished product is obtained after over cleaning and drying.
Preferably, screw-thread steel adapter heat treatment method according to the present invention, screw-thread steel adapter passes through in the step (1)
High pressure moulding, sand casting form, and the internal thread of precasting shaping is additionally provided with inside the screw-thread steel adapter.
Preferably, screw-thread steel adapter heat treatment method according to the present invention, the material of the screw-thread steel adapter is ball
Black cast iron.
Preferably, screw-thread steel adapter heat treatment method according to the present invention, the Oxygen potential of the spheroidal graphite cast-iron are more than
90%, graphite is more than 150/mm2。
Preferably, screw-thread steel adapter heat treatment method according to the present invention, full-automatic salt quenching equipment in the step (4)
The protective atmosphere of use includes but not limited to hydrogen, nitrogen and carbon monoxide.
Preferably, screw-thread steel adapter heat treatment method according to the present invention, the guarantor that the full-automatic salt quenching equipment uses
Shield atmosphere is carbon monoxide.
Preferably, screw-thread steel adapter heat treatment method according to the present invention, salt bath furnace uses molten in the step (6)
Melting saline solution includes at least one of sodium chloride, potassium chloride, barium chloride, sodium nitrate, potassium nitrate and sodium nitrite.
Preferably, screw-thread steel adapter heat treatment method according to the present invention, the melting saline solution is that mass ratio is 50%
Potassium nitrate and mass ratio are the mixed liquor of 50% sodium nitrite.
Preferably, screw-thread steel adapter heat treatment method according to the present invention uses ultrasonic cleaning in the step (7)
Machine starts the cleaning processing screw-thread steel adapter.
Compared with prior art, technical scheme has the following advantages that：
Present invention is disclosed a kind of screw-thread steel adapter same temperature hardening heat treatment method, the screw-thread steel after the present invention is heat-treated continues
Device is connect, hardness can reach 320 HB~380HB, and tensile strength can reach 900MPa~1200MPa, the relatively tradition with size
45 steel adapter intensity improve more than 20%；Further, since the density ratio steel of spheroidal graphite cast-iron is low, weight also mitigates about 8%, and wear-resisting
Property enhancing, service life extend.
Description of the drawings
By reading the detailed description of following detailed description, it is various other the advantages of and benefit it is common for this field
Technical staff will be apparent understanding.Attached drawing is only used for showing the purpose of specific embodiment, and is not considered as to invention
Limitation.In the accompanying drawings：
Fig. 1 is the process flow chart of screw-thread steel adapter heat treatment method of the present invention.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.The embodiment is shown
Example is shown in the drawings, specific reality of the specific embodiment described in following embodiments of the present invention only as the present invention
Apply the exemplary illustration of mode, it is intended to for explaining the present invention, and be not configured to limitation of the present invention.
It is shown in Fig. 1, screw-thread steel adapter heat treatment method includes the following steps：
Step 101：Casting meets the screw-thread steel adapter workpiece of design or requirement.
Wherein, screw-thread steel adapter is formed through high pressure moulding, sand casting, and the inside of the screw-thread steel adapter is also set up
There is the internal thread that precasting shapes, the screw thread continued access with reinforcing bar is realized by the internal thread.The material of above-mentioned screw-thread steel adapter is adopted
With high-quality spheroidal graphite cast iron, the Oxygen potential of the high-quality spheroidal graphite cast iron is more than 90%, and graphite is more than 150/mm2。
Step 102：Screw-thread steel adapter blank roughing.
After casting, screw-thread steel adapter blank is machined out, when machining leaves heat treatment deformation amount.
Step 103：Screw-thread steel adapter finishes.
Screw-thread steel adapter after machining such as is ground at the finishing processing, obtains screw-thread steel adapter semi-finished product.
Step 104：Screw-thread steel adapter after finishing is sent to full-automatic salt quenching device.
Screw-thread steel adapter semi-finished product after finishing are sent to the full-automatic salt under atmosphere protection and computer control
In quenching equipment, protective atmosphere influences to avoid workpiece surface oxidation and decarbonization, computer control to avoid human factor, makes following step
The quality of rapid same temperature hardening heat treatment is more stablized.
In this step, the protective atmosphere that full-automatic salt quenching equipment uses can be hydrogen, nitrogen, carbon monoxide etc..
Step 105：In the heating furnace of full-automatic salt quenching equipment, after screw-thread steel adapter is heated to 830 DEG C~920 DEG C
Keep the temperature 1 it is small when~2 it is small when carry out austenitizing processing.
This step main purpose is the matrix of screw-thread steel adapter is promoted to homogenize, and makes screw-thread steel adapter matrix complete
Metamorphosis becomes austenite.
Step 106：Heat preservation 2 is small after being cooled to 280 DEG C~350 DEG C rapidly in the salt bath of full-automatic salt quenching equipment salt bath furnace
When~3 it is small when carry out same temperature hardening heat treatment；This step needs are quickly cooled down, the intermediate group otherwise generated in cooling procedure
The microscopic structure of workpiece material can be had an impact with engineering properties by knitting.
In this step, the melting saline solution that salt bath furnace uses can be sodium chloride, potassium chloride, barium chloride, sodium nitrate, nitric acid
One kind in potassium and sodium nitrite or a variety of, you can be the mixed liquor of above-mentioned each melting saline solution ingredient.
Step 107：In the water-bath of normal temperature condition, the screw-thread steel adapter after isothermal hardening is washed with water.
In the step, supersonic wave cleaning machine may be employed, screw-thread steel adapter is started the cleaning processing.Supersonic wave cleaning machine
The residue on screw-thread steel adapter surface can not only be cleaned up, it can also be by through hole and internal thread on screw-thread steel adapter
In impurity flush out come, supersonic wave cleaning machine is easy to operate, cleaning effect is good and cleaning efficiency is high.
Step 108：Isothermal hardening screw-thread steel adapter finished product is obtained after over cleaning and drying.
Screw-thread steel adapter workpiece after over cleaning, obtained after drying is dry isothermal hardening screw-thread steel adapter into
Product.
Embodiment 1
A kind of telescopic screw-thread steel adapter, for connecting the two adjacent spirals positioned at middle part, heat treatment method is as follows,
Mainly include the following steps：
(1) 90%, graphite is more than using Oxygen potential and is more than 150/mm2Nodular cast iron material, casting meet design ruler
The screw-thread steel adapter of very little requirement；
The screw-thread steel adapter is formed through high pressure moulding, sand casting, and internal both ends are both provided with the internal thread of precasting shaping,
The internal thread is mutually engaged matching with the cross rib of screw-thread steel, realizes that screw thread continued access connects by the internal thread and both ends spiral
It connects.
(2) after casting, above-mentioned screw-thread steel adapter blank is machined out, when machining leaves heat treatment deformation amount.
(3) the screw-thread steel adapter after machining the finishing such as are ground to handle, obtain screw-thread steel adapter half into
Product.
(4) by the screw-thread steel adapter semi-finished product after finishing send under atmosphere protection and computer control it is complete from
In dynamic salt quenching equipment, protective atmosphere is carbon monoxide.
(5) in the heating furnace of full-automatic salt quenching equipment, when heat preservation 1.5 is small after screw-thread steel adapter is heated to 870 DEG C
Carry out austenitizing processing.
(6) step (5) austenitizing will be passed through treated that screw-thread steel adapter puts into full-automatic salt quenching equipment salt
In the salt bath of liquid furnace, same temperature hardening heat treatment is carried out when heat preservation 2 is small after being cooled to 300 DEG C rapidly in salt bath；Wherein, it is described molten
Melt the mixed liquor that saline solution is the potassium nitrate that mass ratio is 50% and the sodium nitrite that mass ratio is 50%.
(7) screw-thread steel adapter from salt bath furnace is taken out, under normal temperature condition, is cleaned in supersonic wave cleaning machine.
(8) the screw-thread steel adapter after over cleaning obtains isothermal hardening screw-thread steel adapter finished product after drying.
After testing, the hardness of spheroidal graphite cast-iron screw-thread steel adapter finished product is 360HB in embodiment 1, tensile strength is
1000MPa, tensile strength reach twice of spiral（Spiral tensile strength is 500MPa or so）, mechanical strength relatively phase
Same design size, material improve 20% for the steel bar connector of 45 steel；In addition, because spheroidal graphite cast-iron density is less than steel density, the screw thread
The weight saving 8% of steel adapter, and wearability enhances, service life extends.
Embodiment 2
A kind of screw-thread steel adapter, for the connection of spiral end and concrete, heat treatment method is included such as
Lower step：
(1) 90%, graphite is more than using Oxygen potential and is more than 150/mm2Nodular cast iron material, casting meet design size
It is required that screw-thread steel adapter；
The screw-thread steel adapter is formed through high pressure moulding, sand casting, and its one end is provided with the internal thread of precasting shaping, the other end
It is provided with and is embedded in concrete to strengthen fixed pedestal；The internal thread is mutually engaged matching with the cross rib of screw-thread steel, leads to
It crosses the internal thread and realizes that screw thread continued access is connected with spiral.
(2) after casting, above-mentioned screw-thread steel adapter blank is machined out, when machining leaves heat treatment deformation amount.
(3) the screw-thread steel adapter after machining the finishing such as are ground to handle, obtain screw-thread steel adapter half into
Product.
(4) the screw-thread steel adapter blank after machining is sent to the full-automatic salt under atmosphere protection and computer control
In quenching equipment, protective atmosphere is carbon monoxide.
(5) in the heating furnace of full-automatic salt quenching equipment, after screw-thread steel adapter is heated to 900 DEG C keep the temperature 2 it is small when into
The processing of row austenitizing.
(6) step (5) austenitizing will be passed through treated that screw-thread steel adapter puts into full-automatic salt quenching equipment salt
In the salt bath of liquid furnace, same temperature hardening heat treatment is carried out when heat preservation 3 is small after being cooled to 330 DEG C rapidly in salt bath；Wherein, it is described molten
Melt the mixed liquor that saline solution is the potassium nitrate that mass ratio is 50% and the sodium nitrite that mass ratio is 50%.
(7) screw-thread steel adapter from salt bath furnace is taken out, under normal temperature condition, is cleaned in supersonic wave cleaning machine.
(8) the screw-thread steel adapter after over cleaning obtains isothermal hardening screw-thread steel adapter finished product after drying.
After testing, the hardness of spheroidal graphite cast-iron screw-thread steel adapter finished product is 380HB in embodiment 2, tensile strength is
1200MPa, mechanical strength improve 25% compared with same design size, material for the end steel bar connector of 45 steel；In addition, because of spheroidal graphite
Cast iron density, which is less than steel density, the weight saving 8% of the screw-thread steel adapter, and wearability, to be enhanced, and service life extends.
Screw-thread steel adapter after same temperature hardening heat treatment of the present invention, hardness can reach 320 HB~380HB, tension
Intensity can reach 900MPa~1200MPa, and the relatively 45 steel adapter intensity of tradition with size improves more than 20%；Further, since
The density ratio steel of spheroidal graphite cast-iron is low, and weight also mitigates about 8%, and wearability enhances, and service life extends.
It should be noted that above-described embodiment is that the present invention will be described rather than limits the invention, and
Those skilled in the art can design alternative embodiment without departing from the scope of the appended claims.In claim
In, word "comprising" does not exclude the presence of data or step not listed in the claims.
Claims (9)
1. a kind of screw-thread steel adapter heat treatment method, which is characterized in that include the following steps：
(1) satisfactory screw-thread steel adapter is cast；
(2) after casting, screw-thread steel adapter blank is machined out, when machining leaves heat treatment deformation amount；
(3) the screw-thread steel adapter after machining is finished, obtains screw-thread steel adapter semi-finished product；
(4) the screw-thread steel adapter semi-finished product after finishing are sent to the full-automatic salt hardening under atmosphere protection and computer control
In equipment；
(5) in the heating furnace of full-automatic salt quenching equipment, when heat preservation 1 is small after screw-thread steel adapter is heated to 830 DEG C~920 DEG C
~2 carry out austenitizing processing when small；
(6) step (5) austenitizing will be passed through treated that screw-thread steel adapter puts into full-automatic salt quenching equipment salt bath furnace
Salt bath in, after being cooled to 280 DEG C~350 DEG C rapidly in salt bath keep the temperature 2 it is small when~3 it is small when carry out same temperature hardening heat treatment；
(7) screw-thread steel adapter from salt bath furnace is taken out, washed with water under room temperature；
(8) isothermal hardening screw-thread steel adapter finished product is obtained after over cleaning and drying.
2. a kind of screw-thread steel adapter heat treatment method according to claim 1, it is characterised in that：In the step (1)
Screw-thread steel adapter is formed through high pressure moulding, sand casting, and the interior of precasting shaping is additionally provided with inside the screw-thread steel adapter
Screw thread.
3. a kind of screw-thread steel adapter heat treatment method according to claim 2, it is characterised in that：The screw-thread steel continued access
The material of device is spheroidal graphite cast-iron.
4. a kind of screw-thread steel adapter heat treatment method according to claim 3, it is characterised in that：The spheroidal graphite cast-iron
Oxygen potential is more than 90%, and graphite is more than 150/mm2。
5. a kind of screw-thread steel adapter heat treatment method according to claim 1, it is characterised in that：In the step (4)
The protective atmosphere that full-automatic salt quenching equipment uses includes but not limited to hydrogen, nitrogen and carbon monoxide.
6. a kind of screw-thread steel adapter heat treatment method according to claim 5, it is characterised in that：The full-automatic salt hardening
The protective atmosphere that equipment uses is carbon monoxide.
7. a kind of screw-thread steel adapter heat treatment method according to claim 1, it is characterised in that：In the step (6)
The melting saline solution that salt bath furnace uses is included in sodium chloride, potassium chloride, barium chloride, sodium nitrate, potassium nitrate and sodium nitrite at least
It is a kind of.
8. a kind of screw-thread steel adapter heat treatment method according to claim 7, it is characterised in that：It is described melting saline solution be
The mixed liquor for the sodium nitrite that the potassium nitrate and mass ratio that mass ratio is 50% are 50%.
9. a kind of screw-thread steel adapter heat treatment method according to claim 1, it is characterised in that：In the step (7)
Screw-thread steel adapter is started the cleaning processing using supersonic wave cleaning machine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810133487.9A CN108103298A (en) | 2018-02-09 | 2018-02-09 | A kind of screw-thread steel adapter heat treatment method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810133487.9A CN108103298A (en) | 2018-02-09 | 2018-02-09 | A kind of screw-thread steel adapter heat treatment method |
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| CN108103298A true CN108103298A (en) | 2018-06-01 |
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ID=62220255
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111546010A (en) * | 2020-05-15 | 2020-08-18 | 重庆伍壹捌摩托车配件有限公司 | Improved method and process for motorcycle starting rod |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 215000 workshop 1, 740 Ting Ting Road, Suzhou Industrial Park, Jiangsu. Applicant after: Appro parts manufacturing (Suzhou) Limited by Share Ltd Address before: 215122 No. 1, No. 740 Ting Ting Road, Wei Ting Town, Suzhou Industrial Park, Jiangsu. Applicant before: EPPs parts manufacturing (Suzhou) Co. Ltd. |
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Application publication date: 20180601 |