CN103509931A - Device for thermally treating track shoe and method thereof - Google Patents
Device for thermally treating track shoe and method thereof Download PDFInfo
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- CN103509931A CN103509931A CN201310469727.XA CN201310469727A CN103509931A CN 103509931 A CN103509931 A CN 103509931A CN 201310469727 A CN201310469727 A CN 201310469727A CN 103509931 A CN103509931 A CN 103509931A
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Abstract
The invention discloses a device for thermally treating a track shoe and a method for thermally treating the track shoe. The device comprises a roller bottom type heating furnace, a spraying type quenching device, a roller bottom type low-temperature tempering furnace, a driving roller, a frequency converter, and a variable frequency motor. The device for thermally treating the track shoe is characterized in that the roller bottom type heating furnace is arranged at the front end of the spraying type quenching device; the low temperature tempering furnace is arranged at the rear end of the spraying type quenching device; the frequency converter is connected with the roller bottom type heating furnace; the variable frequency motor is connected with the spraying type quenching device. The method comprises the steps of heating, quenching and low-temperature tempering, wherein the heating temperature is 870-890 DEG C; an upper sprinkle nozzle, a lower sprinkle nozzle and side sprinkle nozzles of the spraying type quenching device can spray upwards, downwards and laterally respectively; the low-temperature tempering temperature is 290-310 DEG C. By virtue of the device and the method, the comprehensive mechanical property of the 190-pitch 25 MnB material track shoe after thermal treatment can be improved; the workpiece deformation can be reduced.
Description
Technical field
The present invention relates to a kind of grip-pad thermal treatment unit and method, more particularly, the present invention relates to a kind of grip-pad thermal treatment unit and method that can improve the comprehensive mechanical property of grip-pad and/or reduce workpiece deformation amount.
Background technology
Grip-pad is indispensable strength member in the engineering machinery running systems such as crawler mounted crane, crawl dozer, crawler-mounted excavator.Grip-pad is everlasting in sandstone and earth and is worked, except bearing vehicle sole mass, and the additional stress that in the time of also will bearing work, the reactive force on ground and road injustice cause, all, by causing heavy wear and the distortion of grip-pad, even there is early fracture in these.Therefore, need to improve by thermal treatment the comprehensive mechanical property of grip-pad.
Large for cross section, the asymmetric grip-pad in Bi Bao，Qie cross section (for example 190 pitch grip-pads) easily deforms in heat treatment process, therefore need carry out treatment for correcting to workpiece, causes heat treatment efficiency low, and has a strong impact on the work-ing life of grip-pad.
Summary of the invention
The object of the present invention is to provide a kind of grip-pad thermal treatment unit and method, improve the comprehensive mechanical property of grip-pad, reduce workpiece deformation amount.
To achieve these goals, the present invention adopts following technical scheme:
According to a kind of grip-pad thermal treatment unit of the present invention, described device comprises: roller hearth type heating furnace, and heating unit is all installed at bottom and top; Spray-type quenching device, be positioned at roller hearth type heating furnace rear end, comprise quench section and cooling section, on quench section and cooling section, be all positioned at the upper nozzle at spray-type quenching device top, the lower nozzle that is positioned at spray-type quenching device bottom and spray-type quenching device along the side spray head of two sidepieces of grip-pad direct of travel; Roller bottom type low-temp temper furnace, is positioned at spray-type quenching device rear end, and heating unit is installed in bottom; Live roll, in described roller hearth type heating furnace, spray-type quenching device, roller bottom type low-temp temper furnace, live roll is installed, multipair snap ring is set on live roll, space between every pair of snap ring forms a passage, makes the furnace chamber of roller hearth type heating furnace, spray-type quenching device, roller bottom type low-temp temper furnace form a plurality of passages; Frequency transformer, is connected with roller hearth type heating furnace, and output interlock frequency, controls the traveling time of grip-pad in described roller hearth type heating furnace and roller bottom type low-temp temper furnace; Variable-frequency motor, is connected with cooling section with the quenching section of spray-type quenching device respectively, and output quenching band frequency and cooling section frequency are controlled respectively the traveling time of grip-pad in quench section and cooling section.
According to an aspect of the present invention, described grip-pad is 190 pitches, and material is 25MnB.
According to an aspect of the present invention, two pairs of snap rings are all set on the live roll of roller hearth type heating furnace and spray-type quenching device, make roller hearth type heating furnace and spray-type quenching device form two channels, on the live roll of roller bottom type low-temp temper furnace, 4-5 is set to snap ring, makes roller bottom type low-temp temper furnace form 4-5 passage.
According to a kind of grip-pad heat treating method of the present invention, described method comprises the steps:
(1) heating: grip-pad is heated, and Heating temperature is 870 ℃-890 ℃; (2) quench: to the grip-pad jet water course after heating, by controlling water flow pressure, regulate the flow of water, water temperature < 30 ℃; (3) low-temperaturetempering: the grip-pad after quenching is carried out to low-temperaturetempering, and wherein, low tempering temperatures is 290 ℃-310 ℃.
According to an aspect of the present invention, described grip-pad is 190 pitches, and material is 25MnB.
According to an aspect of the present invention, the quenching band frequency of being exported by variable-frequency motor is set to 50Hz, and the cooling section set of frequency of being exported by variable-frequency motor is 28Hz.
According to an aspect of the present invention, the length of grip-pad is 600mm, 700mm or 800mm.
The interlock set of frequency of the grip-pad that according to an aspect of the present invention, length is 600mm is 29Hz; Length is that the interlock set of frequency of the grip-pad of 700mm is 33Hz; Length is that the interlock set of frequency of the grip-pad of 800mm is 38Hz.
According to an aspect of the present invention, in the section of quenching, the water flow pressure of upper nozzle is set to 0.035-0.085MPa, the water flow pressure 0.05-0.09MPa that lower nozzle arranges; In cooling section, the water flow pressure of upper nozzle and lower nozzle is all set to 0.05-0.06MPa.
The water flow pressure of spraying to grip-pad sidepiece according to an aspect of the present invention, is 0.06MPa.
According to the present invention, can obtain but be not limited to following excellent effect:
(1) improve the comprehensive mechanical property after 190 pitch 25MnB material grip-pad thermal treatments;
(2) reduce workpiece deformation amount.
Accompanying drawing explanation
By the detailed description of carrying out below in conjunction with accompanying drawing, above and other objects of the present invention, feature and advantage will become apparent, wherein:
Fig. 1 is a kind of grip-pad thermal treatment unit schematic diagram according to the present invention;
Fig. 2 is the structural representation of live roll.
In accompanying drawing:
1. roller hearth type heating furnace, 2. heating unit, 3. live roll, 4. frequency transformer, 5. spray-type quenching device, the section of 6. quenching, 7. cooling section, 8. upper nozzle, 9. lower nozzle, 10. side spray head, 11. variable-frequency motors, 12. roller bottom type low-temp temper furnaces, 13. snap rings.
Embodiment
Below, with reference to accompanying drawing, describe embodiments of the invention in detail.
According to a kind of grip-pad thermal treatment unit of the present invention, described device comprises roller hearth type heating furnace 1, spray-type quenching device 5, roller bottom type low-temp temper furnace 12, live roll 3, frequency transformer 4, variable-frequency motor 11.
Spray-type quenching device 5 comprises quench section 6 and cooling section 7, the quench top, bottom of section 6 and cooling section 7 and all install shower nozzle 8, lower nozzle 9 and side spray 10 along the sidepiece of grip-pad direct of travel, grip-pad is in spray-type quenching device 5, can be simultaneously from upper nozzle 8, lower nozzle 9 and side spray 10, spray water, therefore, be conducive to whole work-piece cools even, cooling rate is consistent, prevents cracking, the distortion of grip-pad.In addition, side spray 10 is mainly to be quenched in monodentate grip-pad rib position, because monodentate grip-pad rib height is higher, if only adopt upper nozzle 8 and lower nozzle 9 to quench, there is soft spots, the phenomenon of through hardening not in rib position, therefore adopts side spray 10 pairs of rib positions to quench.
According to one embodiment of present invention, grip-pad is 190 pitches, and material is 25MnB, grip-pad length is longer, in heat treatment process, more easily deforms, according to grip-pad thermal treatment unit of the present invention, can effectively reduce distortion, improve the comprehensive mechanical property of grip-pad.But grip-pad pitch of the present invention and material are not limited to this, can also be other pitch and material.
According to the heat treating method of a kind of grip-pad of the present invention, described method comprises the steps:
(1) heating: grip-pad is heated, and Heating temperature is 870 ℃-890 ℃; (2) quench: to the grip-pad jet water course after heating, by controlling water flow pressure, regulate the flow of water, water temperature < 30 ℃; (3) low-temperaturetempering: the grip-pad after quenching is carried out to low-temperaturetempering, and wherein, low tempering temperatures is 290 ℃-310 ℃.
In step (1), roller hearth type heating furnace does not reach 870 ℃-890 ℃ in the temperature of grip-pad ingress, and when workpiece runs to process furnace middle part, temperature reaches 870 ℃-890 ℃.
In step (2), water flow pressure regulates by tensimeter, according to the actual carbon content of 25MnB, (can there is little deviation with a batch difference in actual carbon content to water flow pressure size, carbon content is between 0.23%-0.28%) correspondingly regulate, if detect the grip-pad lower hardness obtaining, correspondingly increase water flow pressure.
In step (3), low-temperaturetempering furnace temperature keeps 290 ℃-310 ℃, if excess Temperature, the hardness of grip-pad and wear resistance reduce; If temperature is too low, can not effectively eliminate quenching residual stress and fragility.
According to one embodiment of present invention, described grip-pad is 190 pitches, and its material can be 25MnB, and its length can be 600mm, 700mm or 800mm.In this embodiment, although the pitch of grip-pad is larger, and length is longer, and in the process of utilizing heat treating method of the present invention to process, grip-pad deflection obviously reduces.Therefore, it is large that method of the present invention can be applicable to cross section, the asymmetric grip-pad in Bi Bao，Qie cross section.Yet grip-pad pitch of the present invention, material and size are not limited to this, can also be other pitch, material and size.
According to another embodiment of the invention, can variable-frequency motor the quenching band frequency of output be set to 50Hz, by the cooling section set of frequency of being exported by variable-frequency motor, be 28Hz.But quenching band frequency and cooling section frequency are not limited to this, can, according to general knowledge as well known to those skilled in the art, according to the pitch of grip-pad, material and size, regulate.
In another embodiment of the present invention, when the length of grip-pad is 600mm, interlock frequency can be set to 29Hz; When the length of grip-pad is 700mm, interlock frequency can be set to 33Hz; When the length of grip-pad is 800mm, interlock frequency can be set to 38Hz.In this embodiment, according to the length adjustment interlock frequency of grip-pad, thereby control the traveling time of grip-pad in roller hearth type heating furnace and low-temp temper furnace, workpiece is longer, and interlock frequency is less, and corresponding heat treatment time is longer.
According to one embodiment of present invention, in the section of quenching, water flow pressure that can upper nozzle is set to 0.035-0.085MPa, the water flow pressure 0.05-0.09MPa that lower nozzle can be arranged; In cooling section, the water flow pressure of upper nozzle and lower nozzle all can be set to 0.05-0.06MPa.By grip-pad is carried out to the water spray of upper nozzle and lower nozzle simultaneously, workpiece deformation amount significantly reduces.
According to another embodiment of the invention, the water flow pressure that can spray to grip-pad sidepiece is set to 0.06MPa.By grip-pad being carried out to the water spray of side spray head, can effectively prevent grip-pad, there is soft spots, the phenomenon of through hardening not in the rib position of monodentate grip-pad especially.
Example 1
Grip-pad is 190 pitches, 25MnB material, and length is 600mm, roller hearth type heating furnace temperature setting is set to 870 ℃.Interlock set of frequency is 38Hz, and the band frequency that quenches in spray-type quenching device is set to 50Hz, and cooling section set of frequency is 28Hz.The water flow pressure of the section of quenching upper nozzle is set to 0.035MPa, and the water flow pressure of the section of quenching lower nozzle is set to 0.05MPa, and the water flow pressure of cooling section upper nozzle and lower nozzle is all set to 0.05MPa, and a side spray water flow pressure is set to 0.06Hz.Low-temperaturetempering furnace temperature is controlled at 290 ℃.
Utilize the grip-pad after above-mentioned heat treating method thermal treatment, in length direction distortion, be not more than 2mm(without aligning again) ratio be 96%, tensile strength is 1460MPa, unit elongation mean value is 14%, hardness mean value is 45HRC, ballistic work mean value is 70J.
Example 2
Grip-pad is 190 pitches, 25MnB material, and length is 700mm, roller hearth type heating furnace temperature setting is set to 880 ℃.Interlock set of frequency is 33Hz, and the band frequency that quenches in spray-type quenching device is set to 50Hz, and cooling section set of frequency is 28Hz.The water flow pressure of the section of quenching upper nozzle is set to 0.065MPa, and the water flow pressure of the section of quenching lower nozzle is set to 0.07MPa, and the water flow pressure of cooling section upper nozzle and lower nozzle is all set to 0.05MPa, and a side spray water flow pressure is set to 0.06Hz.Low-temperaturetempering furnace temperature is controlled at 300 ℃.
Utilize the grip-pad after above-mentioned heat treating method thermal treatment, in length direction distortion, be not more than 2mm(without aligning again) ratio be 95%, tensile strength is 1455MPa, unit elongation mean value is 13%, hardness mean value is 46HRC, ballistic work mean value is 68J.
Example 3
Grip-pad is 190 pitches, 25MnB material, and length is 800mm, roller hearth type heating furnace temperature setting is set to 890 ℃.Interlock set of frequency is 29Hz, and the band frequency that quenches in spray-type quenching device is set to 50Hz, and cooling section set of frequency is 28Hz.The water flow pressure of the section of quenching upper nozzle is set to 0.085MPa, and the water flow pressure of the section of quenching lower nozzle is set to 0.09MPa, and the water flow pressure of cooling section upper nozzle and lower nozzle is all set to 0.06MPa, and a side spray water flow pressure is set to 0.06Hz.Low-temperaturetempering furnace temperature is controlled at 310 ℃.
Utilize the grip-pad after above-mentioned heat treating method thermal treatment, in length direction distortion, be not more than 2mm(without aligning again) ratio be 95%, tensile strength is 1450MPa, unit elongation mean value is 13%, hardness mean value is 48HRC, ballistic work mean value is 70J.
By above-mentioned exemplary embodiment, can find, utilize grip-pad thermal treatment unit of the present invention and method, can effectively reduce the distortion of workpiece, improve the comprehensive mechanical property of grip-pad simultaneously.
Although described exemplary embodiment of the present invention in detail with reference to accompanying drawing, but those skilled in the art are to be understood that, in the situation that do not depart from the spirit and scope of the present invention that limit as claims, can carry out the various changes in form and details to these embodiment.
Claims (10)
1. a grip-pad thermal treatment unit, described device comprises:
Roller hearth type heating furnace, heating unit is all installed at bottom and top;
Spray-type quenching device, be positioned at roller hearth type heating furnace rear end, comprise quench section and cooling section, on quench section and cooling section, be all positioned at the upper nozzle at spray-type quenching device top, the lower nozzle that is positioned at spray-type quenching device bottom and spray-type quenching device along the side spray head of two sidepieces of grip-pad direct of travel;
Roller bottom type low-temp temper furnace, is positioned at spray-type quenching device rear end, and heating unit is installed in bottom;
Live roll, in described roller hearth type heating furnace, spray-type quenching device, roller bottom type low-temp temper furnace, live roll is installed, multipair snap ring is set on live roll, space between every pair of snap ring forms a passage, makes the furnace chamber of roller hearth type heating furnace, spray-type quenching device, roller bottom type low-temp temper furnace form a plurality of passages;
Frequency transformer, is connected with roller hearth type heating furnace, and output interlock frequency, controls the traveling time of grip-pad in described roller hearth type heating furnace and roller bottom type low-temp temper furnace;
Variable-frequency motor, is connected with cooling section with the quenching section of spray-type quenching device respectively, and output quenching band frequency and cooling section frequency are controlled respectively the traveling time of grip-pad in quench section and cooling section.
2. grip-pad thermal treatment unit according to claim 1, is characterized in that described grip-pad is 190 pitches, and material is 25MnB.
3. grip-pad thermal treatment unit according to claim 1, it is characterized in that, on the live roll of roller hearth type heating furnace and spray-type quenching device, two pairs of snap rings are all set, make roller hearth type heating furnace and spray-type quenching device form two channels, on the live roll of roller bottom type low-temp temper furnace, 4-5 is set to snap ring, makes roller bottom type low-temp temper furnace form 4-5 passage.
4. a grip-pad heat treating method, described method comprises the steps:
(1) heating: grip-pad is heated, and Heating temperature is 870 ℃-890 ℃;
(2) quench: to the grip-pad jet water course after heating, by controlling water flow pressure, regulate the flow of water, water temperature < 30 ℃;
(3) low-temperaturetempering: the grip-pad after quenching is carried out to low-temperaturetempering, and wherein, low tempering temperatures is 290 ℃-310 ℃.
5. heat treating method according to claim 4, is characterized in that described grip-pad is 190 pitches, and material is 25MnB.
6. heat treating method according to claim 4, is characterized in that, the quenching band frequency of being exported by variable-frequency motor is set to 50Hz, and the cooling section set of frequency of being exported by variable-frequency motor is 28Hz.
7. heat treating method according to claim 4, is characterized in that, the length of grip-pad is 600mm, 700mm or 800mm.
8. heat treating method according to claim 7, is characterized in that, the interlock set of frequency of the grip-pad that length is 600mm is 29Hz; Length is that the interlock set of frequency of the grip-pad of 700mm is 33Hz; Length is that the interlock set of frequency of the grip-pad of 800mm is 38Hz.
9. heat treating method according to claim 4, is characterized in that, in the section of quenching, the water flow pressure of upper nozzle is set to 0.035-0.085MPa, the water flow pressure 0.05-0.09MPa that lower nozzle arranges; In cooling section, the water flow pressure of upper nozzle and lower nozzle is all set to 0.05-0.06MPa.
10. heat treating method according to claim 4, is characterized in that, the water flow pressure of spraying to grip-pad sidepiece is 0.06MPa.
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| CN104313295A (en) * | 2014-10-27 | 2015-01-28 | 中冶南方(武汉)威仕工业炉有限公司 | Continuous tempering furnace of roller hearth plates and annealing method thereof |
| CN104388662A (en) * | 2014-10-27 | 2015-03-04 | 中冶南方(武汉)威仕工业炉有限公司 | Roller-hearth type plate continuous tempering furnace and tempering method thereof |
| CN105506245A (en) * | 2016-02-25 | 2016-04-20 | 马鞍山市伟群实业有限公司 | Mesh belt furnace and control method thereof |
| CN106435116A (en) * | 2016-11-11 | 2017-02-22 | 曹才基 | Double-layer roller modulation production line |
| CN107796159A (en) * | 2017-11-23 | 2018-03-13 | 鹤山市顺亿达铜业制品有限公司 | A kind of copper coin circulating water cooling device |
| CN110904320A (en) * | 2019-11-14 | 2020-03-24 | 北京机电研究所有限公司 | Precision heat treatment production line for thin-wall special-shaped aluminum component |
| CN112458254A (en) * | 2020-12-07 | 2021-03-09 | 江苏华夏炉业有限公司 | Scanning type quenching machine tool for track shoe of engineering machinery |
| CN115365821A (en) * | 2022-07-11 | 2022-11-22 | 常州杭钢卓信机械装备有限公司 | Creeper tread fixing base plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104313295A (en) * | 2014-10-27 | 2015-01-28 | 中冶南方(武汉)威仕工业炉有限公司 | Continuous tempering furnace of roller hearth plates and annealing method thereof |
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| CN104388662B (en) * | 2014-10-27 | 2016-06-29 | 中冶南方(武汉)威仕工业炉有限公司 | Roller-bottom type sheet material continuous tempering furnace and tempering method thereof |
| CN105506245A (en) * | 2016-02-25 | 2016-04-20 | 马鞍山市伟群实业有限公司 | Mesh belt furnace and control method thereof |
| CN106435116A (en) * | 2016-11-11 | 2017-02-22 | 曹才基 | Double-layer roller modulation production line |
| CN107796159A (en) * | 2017-11-23 | 2018-03-13 | 鹤山市顺亿达铜业制品有限公司 | A kind of copper coin circulating water cooling device |
| CN110904320A (en) * | 2019-11-14 | 2020-03-24 | 北京机电研究所有限公司 | Precision heat treatment production line for thin-wall special-shaped aluminum component |
| CN112458254A (en) * | 2020-12-07 | 2021-03-09 | 江苏华夏炉业有限公司 | Scanning type quenching machine tool for track shoe of engineering machinery |
| CN115365821A (en) * | 2022-07-11 | 2022-11-22 | 常州杭钢卓信机械装备有限公司 | Creeper tread fixing base plate |
| CN115365821B (en) * | 2022-07-11 | 2023-12-05 | 常州杭钢卓信机械装备有限公司 | Track shoe fixing bottom plate |
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