CN114891975A - Intermediate frequency induction quenching equipment for curve guide rail - Google Patents
Intermediate frequency induction quenching equipment for curve guide rail Download PDFInfo
- Publication number
- CN114891975A CN114891975A CN202210491590.7A CN202210491590A CN114891975A CN 114891975 A CN114891975 A CN 114891975A CN 202210491590 A CN202210491590 A CN 202210491590A CN 114891975 A CN114891975 A CN 114891975A
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- Prior art keywords
- quenching
- pipe
- guide rail
- frequency induction
- copper pipe
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Links
- 230000000171 quenching effect Effects 0.000 title claims abstract description 75
- 238000010791 quenching Methods 0.000 title claims abstract description 71
- 230000006698 induction Effects 0.000 title claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 51
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052802 copper Inorganic materials 0.000 claims abstract description 29
- 239000010949 copper Substances 0.000 claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 7
- 238000007664 blowing Methods 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000007921 spray Substances 0.000 claims description 15
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 11
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 11
- 241001330002 Bambuseae Species 0.000 claims description 11
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 11
- 239000011425 bamboo Substances 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 11
- 239000000498 cooling water Substances 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 14
- 238000003754 machining Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- 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
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
-
- 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
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
- C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
-
- 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
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses medium-frequency induction quenching equipment for a curve guide rail, which comprises a quenching machine tool, a medium-frequency induction heater and a cooling device, wherein the quenching machine tool comprises a machine body, a frame enclosure mechanism, a rotary fixed base and a manipulator, and is characterized in that the medium-frequency induction heater comprises a transformer box, a U-shaped copper pipe with two pipe arms and U-shaped magnetic steel, the upper ends of the two pipe arms of the U-shaped copper pipe are bent and fixedly connected with the transformer box, the two pipe arms of the U-shaped copper pipe are sequentially distributed from the center of the rotary fixed base to the outside in a radial direction, the U-shaped copper pipe is positioned above the rotary fixed base, and the U-shaped magnetic steel is fixedly sleeved on the pipe arm at the outer side of the U-shaped copper pipe and has an outward opening; the quenching device has the advantages that the width towards the quenching part is smaller, the range of the induction magnetic force line is small, the heating energy of the quenching part is high, the quenching device can adapt to the quenching process of the curve guide rail with different curvatures, the quenching depth and the quenching uniformity of a product are ensured, the quenching process of the curve guide rail with different curvatures is solved, the use is convenient, and the application range is wide.
Description
Technical Field
The invention relates to medium-frequency induction quenching equipment, in particular to medium-frequency induction quenching equipment for a curved guide rail.
Background
Induction heating is the most common surface heating quenching mode in heat treatment, and has the advantages of small workpiece distortion, high production efficiency, energy conservation, environmental protection, easy realization of mechanization and automation of the process and the like; the induction heating utilizes the principle of electromagnetic induction to generate eddy current on the surface of a workpiece for heating, and the induction heating quenching process is adopted to obtain a certain depth hardening layer on the surface of the workpiece and simultaneously enable the core part of the part to still keep the original microstructure and performance, thereby achieving the excellent comprehensive characteristics of improving the fatigue strength and the wear resistance of the workpiece and ensuring the toughness of the core part.
In the practical use process of the arc-shaped curve guide rail, the raceway surface and the core part of a part need to have enough performance support, and the quenching technology has the technical difficulties that the curve guide rail is different from the common arc-shaped guide rail, the wave crests and the wave troughs of the surface are arranged, the arc curvature change is large, the uniformity of the depth of a hardening layer is ensured while the high hardness of the raceway surface is required for the curve guide rail with different curvatures and the surface after quenching, while the quenching induction head in the conventional quenching process has larger width and large range of induction magnetic force lines, and only can be suitable for the surface with the same plane or curvature, otherwise, the uniformity and the depth of the quenching layer cannot be ensured; when the current machining length is used for quenching treatment of a curved guide rail, a set of tools are generally matched for one type, and a set of heating induction coils are matched, so that one machine tool needs to be matched with a plurality of heating coils to adapt to machining of workpieces of various types; when the induction heating coil is disassembled and assembled, the installation error is easily caused, so that the product quality is low, and the adjustment consumes long time.
Disclosure of Invention
The invention aims to solve the technical problem of providing the medium-frequency induction quenching equipment which has good quenching effect and can be suitable for the curve guide rails with different product sizes.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a medium frequency induction quenching equipment of curve guide rail, includes quenching machine tool, medium frequency induction heater and cooling device, the quenching machine tool include lathe bed, frame enclosure mechanism, be used for the fixed rotation unable adjustment base and the manipulator of laying curve guide rail, rotation unable adjustment base rotate to set up on the lathe bed, frame enclosure mechanism encircle to set up the outside of rotating unable adjustment base, cooling device be used for through the spray pipe at the cooling position of setting for to the inboard of curve guide rail spray water cooling, medium frequency induction heater include induction heating power host computer, transformer case, have U type copper pipe and the U type magnet steel of two pipe arms, transformer case fixed setting be in the removal end department of manipulator, the upper end of two pipe arms of U type copper pipe buckle and with transformer case fixed connection, two pipe arms of U type copper pipe follow rotation unable adjustment base's center radial outside distribute in proper order, U type copper pipe be located rotation unable adjustment base's top, the fixed cover of U type magnet steel establish U type copper pipe lean on the pipe arm of outer one side on and the opening outwards, the inside cavity of U type copper pipe form first cooling channel, the vary voltage incasement be provided with second cooling channel, cooling device pass through second cooling channel to first cooling channel circulation transport cooling water, induction heating power host computer pass through the vary voltage case with U type copper union coupling.
The cooling device is fixedly provided with an air blowing device, the air blowing device is used for blowing air between the U-shaped magnetic steel and the inner side of the curved guide rail through an air blowing pipe, and the air blowing pipe and the water spraying pipe are respectively positioned on different sides of the U-shaped magnetic steel. The gas blowing pipe of the gas blowing device performs gas blowing operation on the quenching heated part in the whole process, so that cooling water is prevented from splashing to the surface of the quenching part, and the quenching effect is improved.
The cooling device is provided with a plurality of universal adjustable bamboo joint pipes, one of the universal adjustable bamboo joint pipes is used as an air blowing pipe of the air blowing device, and the other universal adjustable bamboo joint pipes are used as water spraying pipes of the cooling device. The universal adjustable bamboo joint pipe can be bent to any direction as required, so that a reasonable water spraying position and a reasonable air spraying angle are set.
The manipulator is characterized in that a mounting bracket is fixedly arranged at the moving end of the manipulator, the transformer box is fixedly connected with the mounting bracket, a water spray joint is fixedly arranged on the side part of the mounting bracket, and the rear end of the water spray pipe is fixedly arranged on the water spray joint.
Compared with the prior art, the invention has the advantages that when in actual use, the curve guide rail rotates clockwise for a circle on the rotary fixed base, the medium-frequency induction heater is opened during the period, the inner side surface of the curve guide rail is quenched, the quenched part moves to the set cooling position after continuously rotating and is cooled by the spray pipe, and during the quenching period, the manipulator can continuously move back and forth according to the induction signal of the medium-frequency induction heater, so that the quenching effects of different parts of the curve guide rail are always kept consistent; the special induction heater has small width towards the quenching part, so that the range of induction magnetic lines is small, and the heating energy of the quenching part is high, thereby being suitable for the quenching process of the curve guide rails with different curvatures, ensuring the quenching depth and uniformity of products, solving the problem of the quenching process of the curve guide rails with different curvatures, meeting the requirement of the quenching depth after testing of the products, and having better quenching depth than that of the traditional structure; the inside cavity of U type copper pipe forms first cooling channel, is provided with second cooling channel in the vary voltage case, and cooling device passes through second cooling channel to first cooling channel circular transportation cooling water, guarantees the continuous cooling to U type copper pipe.
At present, more than ten curve guide rail products are suitable for the quenching equipment, the quenching equipment provided by the invention can be suitable for quenching operation of workpieces of various types, is convenient to use and wide in application range, and can effectively improve the working efficiency.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a first partial schematic view of the present invention;
FIG. 3 is a partial structural diagram of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following examples of the drawings.
The first embodiment is as follows: an intermediate frequency induction quenching device of a curve guide rail comprises a quenching machine tool, an intermediate frequency induction heater and a cooling device, wherein the quenching machine tool comprises a machine tool body 11, a frame enclosure mechanism 12, a rotary fixed base 13 for fixedly placing the curve guide rail 3 and a manipulator 14, the rotary fixed base 13 is rotatably arranged on the machine tool body 11, the frame enclosure mechanism 12 is arranged outside the rotary fixed base 13 in a surrounding way, a plurality of universal adjustable bamboo joint pipes are arranged on the cooling device to be used as water spraying pipes 2, the cooling device is used for carrying out water spraying cooling on the inner side of the curve guide rail 3 through the water spraying pipes 2 at a set cooling position, the intermediate frequency induction heater comprises an induction heating power supply host 15, a transformer box 41, a U-shaped copper pipe 42 with two pipe arms and a U-shaped magnetic steel 43, a mounting bracket 51 is fixedly arranged at the moving end of the manipulator 14, the transformer box 41 is fixedly connected with the mounting bracket 51, the lateral part of installing support 51 is fixed and is provided with water spray joint 52, the rear end of spray pipe 2 is fixed to be set up on water spray joint 52, the upper end of two arms of U type copper pipe 42 is buckled and with vary voltage case 41 fixed connection, two arms of U type copper pipe 42 radially outwards distribute in proper order from the center of rotating unable adjustment base 13, U type copper pipe 42 is located the top of rotating unable adjustment base 13, U type magnet steel 43 fixed cover is established on the arm of U type copper pipe 42 one side outward and the opening outwards, the inside cavity of U type copper pipe 42 forms first cooling channel (not shown), be provided with the second cooling channel (not shown) in the vary voltage case 41, cooling device passes through the second cooling channel and carries the cooling water to first cooling channel circulation, induction heating power supply host computer 15 is connected with U type copper pipe 42 electricity through vary voltage case 41. Wherein, the cooling device is a conventional cooling structure formed by an industrial water chiller 61, a centrifugal pump and various water pipes.
Example two: the rest parts of the cooling device are the same as the first embodiment, and the difference is that the cooling device is fixedly provided with an air blowing device, the air blowing device is used for blowing air between the U-shaped magnetic steel 43 and the inner side of the curved guide rail 3 through an air blowing pipe 7, the air blowing pipe 7 and the water spraying pipes 2 are respectively positioned on different sides of the U-shaped magnetic steel 43, the cooling device is provided with a plurality of universal adjustable bamboo joint pipes, one universal adjustable bamboo joint pipe serves as the air blowing pipe 7 of the air blowing device, and the rest universal adjustable bamboo joint pipes serve as the water spraying pipes 2 of the cooling device.
The quenching process of the above example is as follows:
1): after the curve guide rail 3 is manually placed on the rotary fixing base 13, the controller controls the rotary fixing base 13 to drive the curve guide rail 3 to rotate to a preset position, then the manipulator 14 moves under the control of the controller to enable the U-shaped copper pipe 42 and the water outlet of the cooling device to reach a specified position, and the machine is ready for quenching;
2): the automatic quenching process is started manually, the curved guide rail 3 rotates clockwise for a circle on the rotary fixed base 13, the medium-frequency induction heater is turned on during the process, the inner surface of the curved guide rail 3 is quenched, the quenched part moves to the water spray pipe 2 of the cooling device to be cooled after continuing to rotate, and the air blow pipe 7 of the air blowing device positioned on the other side blows air to the quenching heated part in the whole process, so that cooling water is prevented from splashing to the surface of the quenched part to influence the quenching effect; during the quenching period, the manipulator 14 can continuously move the manipulator 14 back and forth according to the induction signal of the medium frequency induction heater, so that the quenching effects of different parts of the curved guide rail 3 are always kept consistent.
3): the quenching is stopped after the curve guide rail 3 rotates for a circle, the manipulator 14 ascends, the rotating fixing base 13 stops rotating, and the quenching part of the curve guide rail 3 is cooled by the cooling device immediately after being heated, so that the temperature of the curve guide rail 3 is normal, and a worker can take out the curve guide rail 3 immediately and place a new curve guide rail 3 to restart the quenching process.
The qualified quenching depth of the curved guide rail 3 is required to be more than 3mm, and the data of the quenching depths of 3 products after quenching by the traditional quenching equipment and the quenching equipment adopted in the first embodiment and the second embodiment are compared with the data of table 1, wherein each unit is mm.
TABLE 1
| Quenching depth of conventional quenching equipment | Example one quenching depth of the Structure | Quenching depth of Structure adopted in example two | |
| Product I | 1.49 | 3.42 | 4.14 |
| Product No. two | 2.01 | 3.03 | 3.43 |
| Product No. three | 1.97 | 3.06 | 4.38 |
| Average quench depth | 1.82 | 3.17 | 3.98 |
After comparison, the quenching depth of the product obtained by adopting the quenching equipment of the first embodiment and the quenching equipment of the second embodiment is better than that of the product obtained by adopting the traditional quenching equipment, and the quenching depth of the product is more than 3 mm.
Claims (4)
1. The medium-frequency induction quenching equipment for the curve guide rail comprises a quenching machine tool, a medium-frequency induction heater and a cooling device, wherein the quenching machine tool comprises a machine body, a frame enclosure mechanism, a rotary fixed base and a mechanical arm, the rotary fixed base is used for fixedly placing the curve guide rail, the rotary fixed base is rotatably arranged on the machine body, the frame enclosure mechanism is arranged outside the rotary fixed base in a surrounding manner, the cooling device is used for carrying out water spray cooling on the inner side of the curve guide rail at a set cooling position through a water spray pipe, and the medium-frequency induction heater is characterized by comprising an induction heating power supply host, a transformer box, a U-shaped copper pipe with two pipe arms and U-shaped magnetic steel, the transformer box is fixedly arranged at the moving end of the mechanical arm, the upper ends of the two pipe arms of the U-shaped copper pipe are bent and fixedly connected with the transformer box, two pipe arms of U type copper pipe follow rotation unable adjustment base's center radial outside distribute in proper order, U type copper pipe be located rotation unable adjustment base's top, the fixed cover of U type magnet steel establish U type copper pipe lean on the pipe arm of outer one side on and the opening outwards, the inside cavity of U type copper pipe form first cooling channel, the vary voltage incasement be provided with second cooling channel, cooling device pass through second cooling channel to first cooling channel circulation transport cooling water, induction heating power host computer pass through the vary voltage case with U type copper union coupling.
2. The medium-frequency induction quenching equipment for the curved guide rail according to claim 1, wherein the cooling device is fixedly provided with an air blowing device, the air blowing device is used for blowing air between the U-shaped magnetic steel and the inner side of the curved guide rail through an air blowing pipe, and the air blowing pipe and the water spraying pipe are respectively positioned on different sides of the U-shaped magnetic steel.
3. The medium-frequency induction quenching equipment for the curved guide rail according to claim 2, wherein a plurality of universal adjustable bamboo joint pipes are arranged on the cooling device, one universal adjustable bamboo joint pipe is used as an air blowing pipe of the air blowing device, and the other universal adjustable bamboo joint pipes are used as water spraying pipes of the cooling device.
4. The medium frequency induction hardening equipment of curved guide rail according to claim 1, characterized in that a mounting bracket is fixedly arranged at a moving end of the manipulator, the transformer tank is fixedly connected with the mounting bracket, a water spray joint is fixedly arranged at a side portion of the mounting bracket, and a rear end of the water spray pipe is fixedly arranged on the water spray joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210491590.7A CN114891975B (en) | 2022-04-29 | 2022-04-29 | Medium frequency induction quenching equipment for curve guide rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210491590.7A CN114891975B (en) | 2022-04-29 | 2022-04-29 | Medium frequency induction quenching equipment for curve guide rail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114891975A true CN114891975A (en) | 2022-08-12 |
| CN114891975B CN114891975B (en) | 2024-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210491590.7A Active CN114891975B (en) | 2022-04-29 | 2022-04-29 | Medium frequency induction quenching equipment for curve guide rail |
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| Country | Link |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0743932U (en) * | 1993-10-06 | 1995-10-03 | 株式会社水口熱処理 | Various profile surface moving quenching induction coil |
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| CN201376987Y (en) * | 2009-04-17 | 2010-01-06 | 上海热处理厂有限公司 | Large-scale wafer diathermal U-shaped intermediate frequency quenching inductor |
| CN201990698U (en) * | 2011-01-30 | 2011-09-28 | 深圳市和胜金属技术有限公司 | Special continuous quenching inductor for small elongated slot |
| CN202595192U (en) * | 2012-06-01 | 2012-12-12 | 鄂州钢华机械制造有限公司 | Medium-frequency induce quenching device of roller circumferential surface |
| WO2013065818A1 (en) * | 2011-11-04 | 2013-05-10 | Ntn株式会社 | High-frequency heat treatment coil, outer-side joint member for constant-velocity universal joint, and constant-velocity universal joint |
| CN203229559U (en) * | 2013-03-16 | 2013-10-09 | 江阴润源机械有限公司 | Supporting roller diathermic type power frequency induction quenching machine tool |
| CN203602656U (en) * | 2013-11-18 | 2014-05-21 | 宁夏天地奔牛实业集团有限公司 | Mine sprocket sensor with spatial special-shaped curve chain nest |
| CN106244785A (en) * | 2016-07-28 | 2016-12-21 | 石家庄新莱特机械轧辊有限公司 | A kind of quenching unit for thrust wheel of digging machine shaft head and technique thereof |
| CN205874484U (en) * | 2016-07-28 | 2017-01-11 | 石家庄新莱特机械轧辊有限公司 | Excavator thrust wheel neck and electromagnetic induction heating of end portion frock |
| CN211522253U (en) * | 2020-01-16 | 2020-09-18 | 太原重工股份有限公司 | Quenching inductor |
-
2022
- 2022-04-29 CN CN202210491590.7A patent/CN114891975B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0743932U (en) * | 1993-10-06 | 1995-10-03 | 株式会社水口熱処理 | Various profile surface moving quenching induction coil |
| JP2001240914A (en) * | 2000-03-01 | 2001-09-04 | Komatsu Ltd | Crawler bush and method and apparatus for producing it |
| CN101403029A (en) * | 2008-11-19 | 2009-04-08 | 南车戚墅堰机车有限公司 | Method and device for quenching traction arc face location of end pin hole of coupler hook body |
| CN201376987Y (en) * | 2009-04-17 | 2010-01-06 | 上海热处理厂有限公司 | Large-scale wafer diathermal U-shaped intermediate frequency quenching inductor |
| CN201990698U (en) * | 2011-01-30 | 2011-09-28 | 深圳市和胜金属技术有限公司 | Special continuous quenching inductor for small elongated slot |
| WO2013065818A1 (en) * | 2011-11-04 | 2013-05-10 | Ntn株式会社 | High-frequency heat treatment coil, outer-side joint member for constant-velocity universal joint, and constant-velocity universal joint |
| CN202595192U (en) * | 2012-06-01 | 2012-12-12 | 鄂州钢华机械制造有限公司 | Medium-frequency induce quenching device of roller circumferential surface |
| CN203229559U (en) * | 2013-03-16 | 2013-10-09 | 江阴润源机械有限公司 | Supporting roller diathermic type power frequency induction quenching machine tool |
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| CN205874484U (en) * | 2016-07-28 | 2017-01-11 | 石家庄新莱特机械轧辊有限公司 | Excavator thrust wheel neck and electromagnetic induction heating of end portion frock |
| CN211522253U (en) * | 2020-01-16 | 2020-09-18 | 太原重工股份有限公司 | Quenching inductor |
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| CN114891975B (en) | 2024-03-29 |
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