CN102181621A - Quenching and tempering treatment method of steel slender axle type part - Google Patents
Quenching and tempering treatment method of steel slender axle type part Download PDFInfo
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Abstract
The invention relates to a quenching and tempering treatment method of the steel slender axle type part. The method comprises the following main steps: the front end of a steel rod passes through an active feeding device, a quenching heating device, a quenching cooling device, a tempering heating device, a tempering cooling device, an active material-pulling device and a length-cutting device in turn; the active feeding speed V1 is not more than the active material-pulling speed V2; the output quantity of the heating device and the advancing speed of the steel rod are adjusted to ensure that the temperature of the steel rod coming from the outlet of the quenching heating device reaches the quenching temperature, the cooling device is adjusted to ensure that the temperature of the steel rod coming from the outlet of the cooling device is less than the martensite characteristic temperature, the tempering heating device is adjusted to ensure that the temperature of the steel rod coming from the outlet of the tempering heating device reaches the tempering temperature, the cooling device is adjusted to ensure that the temperature of the steel rod coming from the outlet of the cooling device reaches the room temperature; then length cutting is performed according to the required length; and the steel rod is placed in a secondary tempering furnace for tempering according to need. The product obtained by the method has proper hardness, good quality and low cost and continuous production can be realized.
Description
Technical field the present invention relates to a kind of Heat Treatment Of Steel method, particularly steel thin and long shafts or the rod member portion product tempering method for treating of quenching.
Background technology is present, and the quench working method of tempering (as mould accessory thimble) of domestic steel thin and long shafts or rod member portion product is: material is cut into needs length in salt stove or the vacuum oven temper of quenching.There are three drawbacks in this treatment process:
1, be subjected to the limitation of apparatus processing district size, the length of many elongate rod products is restricted (for example length can't be handled because the degree of depth of the insufficient height of vacuum oven or salt stove is not enough greater than the thimble of 500mm);
2, be subjected to the influence of salt stove or vacuum oven temperature uniformity, the thermal treatment quality of workpiece is difficult to uniformity;
3, slender rod piece is after Overheating Treatment, because the bending that the higher heat treatment deformation of hardness causes is difficult to alignment.
Above-mentioned drawback has greatly limited the making scope of portion's product, and has reduced portion's product quality and production efficiency, has improved tooling cost.It is the online multistage tempering refrigerating unit of establishing that traditional continuous oven temper tempering heat treatment method of quenching is arranged again, so not only causes the lengthening of steel wire in line length, and because tempering does not guarantee soaking time continuously, causes tempering quality to reduce.
Summary of the invention the object of the present invention is to provide that a kind of product hardness is suitable, quality good, can continuous production, steel thin and long shafts portion product that cost the is low tempering method for treating of quenching.The present invention mainly be adopt that raw material direct-on-line to steel portion product quenches, a tempering and alignment and twice or above tempering if desired, the heat treating method that the tempering more than twice or twice is carried out in the cycle tempering stove.
One, the present invention is suitable for all steel grades of temper of quenching, as: the 38CrMoAL in the structure iron, 40Cr, 45#, 42CrMo; W6Mo5Cr4V2 in the tool steel, 4Cr5MoSiV1, FDAC; 65Mn in the spring steel, 60Si2CrA, 50CrVA; GCr15 in the bearing steel, GCr15SiMn, 9Cr18 etc.
Two, equipment of the present invention mainly includes: pay-off, quenching heating unit, quenching cooler, tempering heating unit, tempering refrigerating unit, lead materials device, fixed ruler cutting device and periodic tempering stove.Wherein, feeding and lead materials device and comprise that mainly motor variable-frequency speed-regulating drives mip rolls, (being the frequency control motor roller transfer unit among the embodiment) is by adjusting the rotating speed control input speed V1 and the pulling speed V2 of mip rolls.Quenching and tempered heating unit have multiple, as: continous way resistance heading furnace, middle and high frequency induction heater, Fuel Furnace or the like.Quench and the tempered type of cooling also have multiple,, oil cooling cold and heat exchanger etc. as: water-cooled, air.The fixed ruler cutting device is the conventional equipment of market sale.Double tempering adopts cycle tempering stove such as common box tempering stove commonly used and well formula tempering stove.Preferably at first will need tempered steel bar (rod) to place in the straight anchor clamps of guarantor of restriction tempering distortion, this protects straight anchor clamps is the hollow cylinder that interior cavity length can hold steel bar length, closed at both ends, according to the tempering stove difference, the face shaping in this cylindrical shell cross section can be different, it can be square or Polygons, but its charge cross section is one or more trilaterals.Be provided with the opening that the loading and unloading steel bar is used on the straight anchor clamps of above-mentioned guarantor along its length, this opening is provided with the lid with its sealing, and this lid is provided with it is pressed on the fastening piece on the steel bar arranged side by side in the tube.
Three, making method of the present invention is as follows:
Set active feeding speed V1, quenching temperature, quench cooling rate, tempering Heating temperature, tempering speed of cooling, initiatively draw material speed V2 according to the working ability of properties of materials and equipment, simultaneously must V1≤V2.
(3) b adopts resistance furnace heating or Fuel Furnace heating, at first start heating unit treat its quenching furnance and furnace temperature all reach setting require temperature the time, restart and lead materials device and pay-off directly makes V1≤V2, make pay-off and draw the steel bar (rod) between 2 of the materials devices to form tension force, the tensile size depends on the difference of V1 and V2, the tensile upper limit is controlled in the 0.5mm/m steel wire amount of bow with the quench tempering distortion of effective restriction steel wire, the temperature that makes steel bar (rod) export out from the quenching heating unit reaches the quenching temperature that its material itself requires, and reaches the tempering temperature that material itself requires from the temperature that the tempering heating unit exports out; Startup and adjustment quenching cooler make steel bar (rod) be lower than the martensite point through the temperature of quenching cooler outlet, and to finish quenching, hardness will reach the hardness of regulation after quenching was finished; Startup and adjustment tempering refrigerating unit make steel bar (rod) reach normal temperature through the temperature of apparatus for supercooling outlet, and to finish tempering, hardness will reach the tempered-hardness of regulation after tempering was finished.
By the fixed ruler cutting device on demand length carry out fixed ruler cutting, generally all be the 2m scale.
When adopting method of the present invention that steel wire is quenched temper, because delivery rate V1≤draw material speed V2, cause the steel wire of online treatment to form certain force of strain, the tensile result makes steel wire be straightened at the top temperature point of the heating of quenching (because it is best to form the plasticity of district's temperature vertex at whole tension force), because existing, tensile make the whole piece steel wire in quenching and cooling and tempering and refrigerative process, any distortion can not take place, so just both finish the temper of quenching of whole piece steel wire, guaranteed the linearity of steel wire simultaneously again.And double tempering places steel bar (rod) and protects the inherent cycle tempering stove of straight anchor clamps and carry out tempering, thereby has so not only guaranteed that the steel wire that rolls off the production line can not deform simultaneously crooked but also can guarantee enough tempering time raising tempering qualities because of tempering.
The present invention compared with prior art has following advantage:
1, the product thermal treatment quality is uniform and stable.
2, the quench linearity of tempering processed goods is good, has improved the production efficiency of portion's product processing.
3, the making length of portion's product no longer the limitation of the effective workspace size of heat-treated equipment (for example the mold thimble on demand length produce---can produce the above thimble of 1m).
Description of drawings:
Fig. 1 is a technological process of production simplified schematic diagram of the present invention.
Fig. 2 is a double tempering anchor clamps schematic perspective view of the present invention.
In steel thin and long shafts portion product shown in Figure 1 are quenched the technological process of production simplified schematic diagram of tempering method for treating, pending dish circle 1 places on the dish circle support, the front end of steel wire (rod) 2 passes initiatively pay-off 3, quenching heating installation 4, quenching cooler 5, tempering heating unit 6, a tempering refrigerating unit 7 successively, initiatively draws materials device 8 and fixed ruler cutting device 9.
Embodiment:
Example 1.
The mould of plastics thimble is with the production method of material 4Cr1MoSiV1: will coil the finished disk unit that raw material is drawn to ∮ 8.3.The finished disk unit that drawing is good places on the pay off rack, installs by order shown in Figure 1: pay-off is a frequency control motor rolling transmission unit, and steel wire passes the transfer roller group and enters the quenching heating unit; This quenching heating unit is the medium-high frequency induction heater, and the induction coil that steel wire passes this well heater enters quenching cooler; This quenching cooler is that water-cooled heat exchanger is that steel wire is advanced by pipeline, and pipeline places the round-robin water tank to take away the heat of steel wire surrounding gas in the pipeline by the circulation of water, the temperature maintenance that makes gas in the pipeline is a lower level, thereby the steel wire that is heated behind the austenitizing conducted heat to the gas around it and cooling transformation is a martensite.Temperature was lower than the quenched martensite point after steel wire passed this quenching cooler, to finish quenching.Then, enter the tempering heating unit; This tempering heating unit is an intermediate frequency induction heating device, and the induction coil that steel wire passes this well heater enters the tempering refrigerating unit; This tempering refrigerating unit is to be made of blower fan and some air ducts that is distributed on around the steel wire, and steel wire passes the air duct pipe and enters and lead materials device, and this leads materials device is the frequency control motor transmission unit that rolls, and steel wire passes the transfer roller group and enters the fixed ruler cutting device.Start pay-off and towing mechanism, V1 ≈ V2 during beginning, restart the medium-high frequency induction heating device of the heating of quenching, the temperature that the power output of adjustment heating and the speed that steel wire is advanced make steel wire export out from the quenching heating unit reaches 1070 ℃, startup and adjustment refrigerating unit make steel wire be lower than 305 ℃ of martensite points through the temperature of apparatus for supercooling outlet, and hardness reached more than the HRC50 after quenching was finished.Restart and adjust the power output of Medium frequency induction tempering equipment, the control steel wire reaches 650 ℃ from the temperature of tempering heating unit outlet.Start and the adjustment air-cooling device, make steel wire reach normal temperature through the temperature of this air cooling equipment outlet, the hardness after this product tempering is the HRC40-45 segment.Adjust the feeding speed V1 of steel wire, make feeding speed V1 less than drawing material speed V2, V2-V1 〉=0.3m/ branch, tension force are controlled at below the 0.5mm/m steel wire amount of bow.Above-mentioned quench tempering and the linearity finished is controlled at steel wire in the acceptability limit again, cuts off every 2 meters long by the fixed ruler cutting device.
The steel wire of above-mentioned cut-out is finished product to be placed in the straight anchor clamps of guarantor side by side, these anchor clamps as shown in Figure 2, this protects straight anchor clamps 10 equal steel wire 11 length, closed at both ends for inner length hollow cylinder, this cylindrical shell cross section is a hexagon, established three dividing plates of medullary ray in it, they are divided into six cross sections with the cylindrical shell cross section is leg-of-mutton monomer die cavity.On the straight anchor clamps of above-mentioned guarantor, be provided with the opening that the loading and unloading steel wire is used along its length, this opening is provided with the lid 12 with its sealing, this lid is provided with it is pressed on the fastening piece 13 on the steel bar arranged side by side in the tube, fill in the anchor clamps behind the steel wire with lid fixing and fastening after, place box tempering stove to carry out double tempering these anchor clamps, temperature is at 520 ℃, through insulation in 2 hours in the control stove.Taking-up places air to cool off then, and this tempered-hardness finally still is 40-45HRC.
Example 2
Thin and long shafts portion product are with the production method of Bearing Quality Steel material GCr15: will coil the finished disk unit that raw material is drawn to ∮ 12.3.The finished disk unit that drawing is good places on the pay off rack, and install by order shown in Figure 1: pay-off is a frequency control motor rolling transmission unit, and steel wire passes the transfer roller group and enters the quenching heating unit; This quenching heating unit is the continuous resistance furnace of duct type, and steel wire passes this duct type heating unit and enters quenching cooler; This quenching cooler be the water-soluble PAG quenching medium aqueous solution (solvent: water=1:10) and water rinse bath, steel wire passes this quenching cooler and enters the tempering heating unit; This tempering heating unit is the continuous resistance furnace of duct type, and steel wire passes this well heater and enters the tempering refrigerating unit; This tempering refrigerating unit is to be made of blower fan and some air ducts that is distributed on around the steel wire, and steel wire passes the air duct pipe and enters and lead materials device, and this leads materials device is the frequency control motor transmission unit that rolls, and steel wire passes the transfer roller group and enters the fixed ruler cutting device.Start the continuous resistance furnace of duct type of quenching and tempering, the quenching furnance temperature is set in 850 ℃, furnace temperature is set at 180 ℃, when quenching heating unit and tempering heating unit all reach design temperature, start feeding, traction and refrigerating unit, steel wire was heated to 850 ℃ and insulation during through the quenching process furnace about 6 minutes in traveling process, through being cooled to normal temperature behind the quenching medium aqueous solution, at this moment, its quenching hardness reaches HRC 60-62, pass through the continuous resistance furnace of tempering duct type again, be heated to 180 ℃ and be incubated more than 10 minutes at this, air-cooled then its tissue is tended towards stability still to remain on HRC 60-62 constant for hardness.Adjust the feeding speed V1 of steel wire, make the pulling speed V2 of V1＜steel wire, V2-V1 〉=0.5m/ branch, tension force are controlled in the 0.5mm/m steel wire amount of bow.The tempering of quenching is finished linearity and is controlled at product in the acceptability limit again, by the fixed ruler cutting device on demand length carry out fixed ruler cutting, a tempering of this GCr15 steel gets final product.Therefore, need not to carry out the stove tempering of clamping cycle.
Example 3.
The mould of plastics thimble is with the production method of tool steel material W6Mo5Cr4V2: will coil the finished disk unit that raw material is drawn to ∮ 6.3.The finished disk unit that drawing is good places on the pay off rack, installs by order shown in Figure 1: pay-off is a frequency control motor rolling transmission unit, and steel wire passes the transfer roller group and enters the quenching heating unit; This quenching heating unit is a duct type gas-fired process furnace, and steel wire passes this heating zone by pipeline and enters quenching cooler; This quenching cooler is that water-cooled heat exchanger is that steel wire is advanced by pipeline, and pipeline places the round-robin water tank to take away the heat of steel wire surrounding gas in the pipeline by the circulation of water, the temperature maintenance that makes gas in the pipeline is a lower level, thereby the steel wire that is heated behind the austenitizing conducted heat to the gas around it and cooling transformation is a martensite.Temperature was lower than the quenched martensite point after steel wire passed this quenching cooler, to finish quenching.Enter the tempering heating unit then; This tempering heating unit is a duct type gas-fired process furnace, and steel wire enters the tempering refrigerating unit after passing this heating unit; This tempering refrigerating unit is to be made of blower fan and some steel wire air ducts on every side that is distributed on, steel wire passes air duct pipe temperature and reaches normal temperature, enter and lead materials device, this leads materials device is frequency control motor rolling transmission unit, and steel wire passes the transfer roller group and enters the fixed ruler cutting device.Thereby starting the tempering heating unit of quenching controls gas valve and gives air quantity with control gas-fired speed control furnace temperature, the furnace temperature of quenching furnance is divided three sections controls, make its every section temperature reach 550 ℃ respectively, 850 ℃ and 1200 ℃, the Control for Kiln Temperature of online tempering stove is at 580 ℃, start feeding, traction and refrigerating unit, adjust the feeding speed V1 that the line sending speed V1 of steel wire and the speed V2 that pulls strings adjust steel wire, make V1＜V2, V2-V1 〉=0.5m/ branch, be heated to 550 ℃ of preheating insulations during steel wire process quenching process furnace, 850 ℃ of preheating insulations and 1200 ℃ of quenching heat tracings, its soaking time approximately was controlled at 4-5 minute, startup is also adjusted and is quenched and the tempering refrigerating unit, makes steel wire be lower than 225 ℃ of martensite points through the temperature of apparatus for supercooling outlet, and hardness reached HRC60-62. steel wire process tempering stove about 10 minutes of 580 ℃ of insulations after quenching was finished, be cooled to normal temperature through apparatus for supercooling, the hardness after the tempering keeps original value HRC60-62 constant.
Because V1＜V2, steel wire forms tension force, and tension force is controlled in the 0.5mm/m steel wire amount of bow.Above-mentioned quench tempering and the linearity finished is controlled at product in the acceptability limit again, carries out fixed ruler cutting by 2 meters length by the fixed ruler cutting device.The W6Mo5Cr4V2 steel will be through three tempering, the product of at first steel wire of above-mentioned cut-out being finished place in as shown in Figure 2 the straight anchor clamps of guarantor side by side, after filling steel wire in the anchor clamps, lid is fixed, then these anchor clamps are placed well formula tempering stove to carry out double tempering, temperature is at 600 ℃, through insulation in 2 hours in the control stove.Taking-up places air to cool off then, is placed on again when integral body is cooled to room temperature and carries out three tempering in the pit furnace, and the control furnace temperature is incubated through 2 hours at 560 ℃.Taking-up places air to cool off then, when integral body is cooled to room temperature, workpiece is taken out.Final hardness was 60 ~ 62HRC after tempering was finished.
Example 4
Thin and long shafts portion product are with the production method of structure steel material 38CrMoAl: will coil the finished disk unit that raw material is drawn to ∮ 10.3.The finished disk unit that drawing is good places on the pay off rack, and install by order shown in Figure 1: pay-off is a frequency control motor rolling transmission unit, and steel wire passes the transfer roller group and enters the quenching heating unit; This quenching heating unit is the continuous resistance furnace of duct type, and steel wire passes this duct type heating unit and enters quenching cooler; This quenching cooler be the water-soluble PAG quenching medium aqueous solution (solvent: water=1:12) and water rinse bath, steel wire passes this quenching cooler and enters the tempering heating unit; This tempering heating unit is the continuous resistance furnace of duct type, and steel wire passes this well heater and enters the tempering refrigerating unit; This tempering refrigerating unit is to be made of blower fan and some air ducts that is distributed on around the steel wire, and steel wire passes the air duct pipe and enters and lead materials device, and this leads materials device is the frequency control motor transmission unit that rolls, and steel wire passes the transfer roller group and enters the fixed ruler cutting device.Start the continuous resistance furnace of duct type of quenching and tempering, the quenching furnance temperature is set in 980 ℃, furnace temperature is set at 550 ℃, when quenching heating unit and tempering heating unit all reach design temperature, start feeding, traction and refrigerating unit, steel wire was heated to 980 ℃ and insulation during through the quenching process furnace about 6 minutes in traveling process, through being cooled to normal temperature behind the quenching medium aqueous solution, at this moment, its quenching hardness reaches HRC 50-55, pass through the continuous resistance furnace of tempering duct type again, be heated to 550 ℃ and be incubated more than 10 minutes at this, air-cooled then its tissue hardness that tends towards stability that makes remains on HRC 38-42.Adjust the feeding speed V1 of steel wire, make V1＜V2, V2-V1 〉=0.5m/ branch, tension force are controlled in the 0.5mm/m steel wire amount of bow.The tempering of quenching is finished linearity and is controlled at product in the acceptability limit again, by the fixed ruler cutting device on demand length carry out fixed ruler cutting, a tempering of this 38CrMoAl steel promptly reaches and needs hardness.
Example 5
Thin and long shafts portion product are with the production method of spring steel material 65Mn: will coil the finished disk unit that raw material is drawn to ∮ 4.3.The finished disk unit that drawing is good places on the pay off rack, and install by order shown in Figure 1: pay-off is a frequency control motor rolling transmission unit, and steel wire passes the transfer roller group and enters the quenching heating unit; This quenching heating unit is the continuous resistance furnace of duct type, and steel wire passes this duct type heating unit and enters quenching cooler; The refrigerant of this quenching cooler is general quenching oil, and steel wire passes this quenching cooler and enters the tempering heating unit; This tempering heating unit is the continuous resistance furnace of duct type, and steel wire passes this well heater and enters the tempering refrigerating unit; This tempering refrigerating unit is to be made of blower fan and some air ducts that is distributed on around the steel wire, and steel wire passes the air duct pipe and enters and lead materials device, and this leads materials device is the frequency control motor transmission unit that rolls, and steel wire passes the transfer roller group and enters the fixed ruler cutting device.Start the continuous resistance furnace of duct type of quenching and tempering, the quenching furnance temperature is set in 820 ℃, tempering heating unit temperature is set at 400 ℃, when quenching heating unit and tempering heating unit all reach design temperature, start feeding, traction and refrigerating unit, steel wire was heated to 820 ℃ and insulation during through the quenching process furnace about 6 minutes in traveling process, through being cooled to normal temperature behind the quenching medium aqueous solution, at this moment, its quenching hardness reaches HRC 60-62, pass through the continuous resistance furnace of tempering duct type again, be heated to 400 ℃ and be incubated more than 10 minutes at this, air-cooled then its tissue hardness that tends towards stability that makes remains on HRC45-48.Adjust the feeding speed V1 of steel wire, make V1＜V2, V2-V1 〉=0.5m/ branch, tension force are controlled in the 0.5mm/m steel wire amount of bow.The tempering of quenching is finished linearity and is controlled at product in the acceptability limit again, by the fixed ruler cutting device on demand length carry out fixed ruler cutting, a tempering of this 65Mn steel promptly reaches and needs hardness.
Claims (5)
1. steel thin and long shafts portion product tempering method for treating of quenching is characterized in that:
2. steel thin and long shafts portion product tempering method for treating of quenching is characterized in that:
3. the steel thin and long shafts according to claim 1 and 2 portion product tempering method for treating of quenching, it is characterized in that: the above-mentioned steel bar that needs secondary or above tempered to cut off is finished product place in the secondary periodic tempering stove and carry out tempering, set its tempered time and temperature according to the requirement of its material.
4. the steel thin and long shafts according to claim 3 portion product tempering method for treating of quenching is characterized in that: will need the tempered steel bar to place in the straight anchor clamps of guarantor of restriction tempering distortion, and place then in the periodic double tempering stove and carry out double tempering.
5. the required anchor clamps of steel thin and long shafts portion's product tempering method for treating according to claim 4, it is characterized in that: this protects straight anchor clamps is the hollow cylinder that interior cavity length can hold steel bar length, closed at both ends, according to the tempering stove difference, the face shaping in this cylindrical shell cross section can be different, it can be square or Polygons, but its charge cross section is a trilateral, on the straight anchor clamps of above-mentioned guarantor, be provided with the opening that the loading and unloading steel bar is used along its length, this opening is provided with the lid with its sealing, and this lid is provided with it is pressed on the fastening piece on the steel bar arranged side by side in the tube.
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| CN 201110104847 CN102181621A (en) | 2011-04-26 | 2011-04-26 | Quenching and tempering treatment method of steel slender axle type part |
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| CN 201110104847 CN102181621A (en) | 2011-04-26 | 2011-04-26 | Quenching and tempering treatment method of steel slender axle type part |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103103333A (en) * | 2013-01-28 | 2013-05-15 | 临沂业隆通用机械有限公司 | Intermediate frequency quenching and tempering heat treatment process and special equipment for pin shaft |
| CN103740903A (en) * | 2013-12-27 | 2014-04-23 | 新昌县奇鹏自动化设备有限公司 | Workpiece heat treatment method |
| CN104651592A (en) * | 2014-06-14 | 2015-05-27 | 柳州市奥凯工程机械有限公司 | Quenching method for 45 steel connecting rod nut |
| CN105483357A (en) * | 2015-12-30 | 2016-04-13 | 浙江华纬弹簧有限公司 | Modified steel wire water quenching production line |
| CN106755904A (en) * | 2016-12-28 | 2017-05-31 | 中国石油天然气集团公司 | A kind of device and method for improving steel tube performance |
| CN111742070A (en) * | 2018-03-23 | 2020-10-02 | 普锐特冶金技术日本有限公司 | Operation support device and operation support method for heat treatment furnace, heat treatment facility and operation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1936032A (en) * | 2006-10-16 | 2007-03-28 | 李向辉 | On-line bright quenching and tempering method and production line of steel wire |
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2011
- 2011-04-26 CN CN 201110104847 patent/CN102181621A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1936032A (en) * | 2006-10-16 | 2007-03-28 | 李向辉 | On-line bright quenching and tempering method and production line of steel wire |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103103333A (en) * | 2013-01-28 | 2013-05-15 | 临沂业隆通用机械有限公司 | Intermediate frequency quenching and tempering heat treatment process and special equipment for pin shaft |
| CN103103333B (en) * | 2013-01-28 | 2014-06-25 | 临沂业隆通用机械有限公司 | Intermediate frequency quenching and tempering heat treatment process and special equipment for pin shaft |
| CN103740903A (en) * | 2013-12-27 | 2014-04-23 | 新昌县奇鹏自动化设备有限公司 | Workpiece heat treatment method |
| CN103740903B (en) * | 2013-12-27 | 2015-06-03 | 浦江县科创进出口有限公司 | Workpiece heat treatment method |
| CN104651592A (en) * | 2014-06-14 | 2015-05-27 | 柳州市奥凯工程机械有限公司 | Quenching method for 45 steel connecting rod nut |
| CN105483357A (en) * | 2015-12-30 | 2016-04-13 | 浙江华纬弹簧有限公司 | Modified steel wire water quenching production line |
| CN106755904A (en) * | 2016-12-28 | 2017-05-31 | 中国石油天然气集团公司 | A kind of device and method for improving steel tube performance |
| CN111742070A (en) * | 2018-03-23 | 2020-10-02 | 普锐特冶金技术日本有限公司 | Operation support device and operation support method for heat treatment furnace, heat treatment facility and operation method thereof |
| US12061047B2 (en) | 2018-03-23 | 2024-08-13 | Primetals Technologies Japan, Ltd. | Operation support apparatus and operation support method for heat-treatment furnace, and a heat-treatment facility and operation method therefor |
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Application publication date: 20110914 |