CN103382519A - Charging basket for thermal treatment of synchronizer gear hub - Google Patents
Charging basket for thermal treatment of synchronizer gear hub Download PDFInfo
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- CN103382519A CN103382519A CN 201310337943 CN201310337943A CN103382519A CN 103382519 A CN103382519 A CN 103382519A CN 201310337943 CN201310337943 CN 201310337943 CN 201310337943 A CN201310337943 A CN 201310337943A CN 103382519 A CN103382519 A CN 103382519A
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Abstract
The invention provides a charging basket for thermal treatment of a synchronizer gear hub. The charging basket comprises a charging basket main base plate and a workpiece gasket group arranged on the charging basket main base plate. The workpiece gasket group comprises a workpiece load-bearing inner gasket and a workpiece outer gasket sleeved on the outer side of the workpiece load-bearing inner gasket, wherein a separation distance exists between the workpiece load-bearing inner gasket and the workpiece outer gasket. When the gear hub to be treated is arranged above the workpiece gasket group, the workpiece load-bearing inner gasket is in contact with the gear hub located above the workpiece load-bearing inner gasket, and a gap exists between the workpiece outer gasket and the external spline end face of the gear hub. The charging basket for the thermal treatment of the synchronizer gear hub is used for a thermal treatment process of the synchronizer gear hub, enables the deformation amount of a carburized-quenched workpiece to be effectively reduced under the condition that a whole carburized layer is ensured to be even and a metallographic structure is ensured to be good and accordingly improves the accuracy of finished workpiece products. In addition, the charging basket has good effect after being used for a long period of time.
Description
Technical field
The invention belongs to the metal heat treatmet technical field, relate to a kind of material basket for heat treatment of synchromesh gear hub.
Background technology
Process the basic case-hardening furnace that adopts for the carburizing and quenching of high to low gear toothholder in heavy type lorry transmission-gear box synchronizer product at present and carry out, its charging mode can be selected the mode of mounting or paperback mode.But for workpiece shown in Figure 1, the distortion after its carburizing and quenching is all very serious for a long time.Be mainly reflected in the ovality that adopts workpiece when mounting overproof serious, and when adopting flat the granting, the planeness of workpiece is overproof serious, especially the male spline of workpiece can the very large tapering of bad student, and when serious, tapering surpasses more than 0.50.Not obvious by effect after adjusting heat treatment parameter for above situation.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of material basket for heat treatment of synchromesh gear hub, especially is suitable for the thermal treatment process of high and low shift tooth hub in counterweight card Synchromous device of gearbox.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of material basket for heat treatment of synchromesh gear hub comprises charging basket main floor and the workpiece washer sets that is arranged on described charging basket main floor; Described workpiece washer sets comprises workpiece load-bearing inner washer and is sheathed on the workpiece outer washer in the described workpiece load-bearing inner washer outside, has spacing between described workpiece load-bearing inner washer and described workpiece outer washer.In the time of above pending tooth hub is placed in described workpiece washer sets, described workpiece load-bearing inner washer is contacted with the kickboard of the tooth hub of the side of being located thereon, have the gap between the male spline end face of described workpiece outer washer and described tooth hub.
The present invention can also adopt following technical measures:
Described material basket for heat treatment also comprises an above square position, and described charging basket main floor and each described square position are spaced from down to up successively, and is connected by an above charging basket column, is respectively equipped with the above workpiece washer sets on each described square position.
The lower end of described workpiece outer washer is provided with outer lug boss.
Described workpiece load-bearing inner washer and described workpiece outer washer are annular, and its center of circle coincides, and the described outer lug boss that is arranged at described workpiece outer washer lower end is the annular outer round platform.
The quantity of described charging basket column is 4, on described charging basket main floor and each described square position, is equipped with the charging basket coaming plate between every two adjacent described charging basket columns, and each charging basket coaming plate on described charging basket main floor and each described square position surrounds respectively rectangle.
The quantity that is arranged at the described workpiece washer sets on described charging basket main floor and each described square position is respectively four.
Described square position quantity is five.
Advantage and positively effect that the present invention has are: the present invention adopts workpiece washer sets structure, in the heat treatment process of synchromesh gear hub, make workpiece guarantee that whole cementation zone is even, in the good situation of metallographic structure, effectively reduce the deflection after workpiece carbonization quenches, thereby improved the finished product accuracy of the type workpiece, and respond well after described charging basket life-time service.
Description of drawings
Fig. 1 is side-view and the front view thereof of synchromesh gear hub
Fig. 2 is the structural representation of the described material basket for heat treatment of the embodiment of the present invention
Fig. 3 is the vertical view of Fig. 2
Fig. 4 is the part enlarged diagram of tooth hub in Fig. 2, workpiece outer washer and workpiece load-bearing inner washer
In figure:
1, charging basket main floor 2, square position 3, charging basket coaming plate 4, charging basket column
5, workpiece load-bearing inner washer 6, workpiece outer washer 7, male spline
8, tooth hub 9, annular outer round platform 10, kickboard
Embodiment
As shown in Fig. 2,3, the invention provides a kind of material basket for heat treatment of synchromesh gear hub 8, comprise charging basket main floor 1 and five square positions 2, charging basket main floor 1 and each square position 2 are spaced from down to up successively, and be connected by 4 charging basket columns 4, be respectively equipped with four workpiece washer sets on charging basket main floor 1 and each square position 2.On charging basket main floor 1 and each square position 2, be equipped with charging basket coaming plate 3 between every two adjacent charging basket columns 4, and surround rectangle.
The workpiece washer sets comprises a workpiece load-bearing inner washer 5 and a workpiece outer washer 6 that is sheathed on workpiece load-bearing inner washer 5 outsides, there is spacing between workpiece load-bearing inner washer 5 and workpiece outer washer 6, and after making tooth hub 8 be placed on workpiece load-bearing inner washer 5, workpiece outer washer 6 is that the gap is left at the male spline 7 tooth positions of the seam plane of major diameter packing ring and tooth hub 8, thereby in the middle of carburizing, quenching process, can effectively reduce gravity to the impact of this tooth position distortion.Workpiece load-bearing inner washer 5 and workpiece outer washer 6 are annular, and its center of circle coincides.The lower end of workpiece outer washer is provided with annular outer round platform 9.
The method of utilizing the charging of above-mentioned charging basket and the synchromesh gear hub 8 of packing into being heat-treated is as follows: a charging basket that installs tooth hub 8 put into the carburizing tinuous production in every 34 minutes and heat-treats, specifically comprise the following steps,
(1) the tooth hub structure as shown in Figure 1, lies in tooth hub 8 on each workpiece washer sets, and tooth hub 8 is not directly contacted with charging basket main floor 1 and each square position 2;
(2) debinding furnace of charged charging basket in step (1) being put into the carburizing tinuous production carries out preheating, degreasing, and preheating temperature is 360-380 ℃; Have 4 basket positions in debinding furnace, be 34 minutes * 4=136 minute warm up time;
(3) put into main stove and carry out carburizing, carburizing temperature is 880-890 ℃; Have 16 basket positions in main stove, carburizing time is 34 minutes * 16=544 minute, and carbon potential is 1.0-1.05;
(4) after carburizing, tooth hub 8 is quenched, quenching temperature is 800-810 ℃, and the cool time is 10-12 minute;
(5) utilize cleaning machine to clean;
(6) put into the tempering stove tempering, tempering temperature is 170-180 ℃; Have 6 basket positions in tempering stove, tempering time is 34 * 6=204 minute;
(7) discharging.
The workpiece washer sets comprises a workpiece load-bearing inner washer 5 and a workpiece outer washer 6 that is sheathed on workpiece load-bearing inner washer 5 outsides, the lower end of workpiece outer washer 6 is provided with annular outer round platform 9, workpiece load-bearing inner washer 5 directly contacts with the kickboard 10 of tooth hub 8, has the gap between male spline 7 end faces of the tooth hub 8 of workpiece outer washer 6 and the side of being located thereon.Charging basket comprises six layers that are comprised of a charging basket main floor 1 and five square positions 2, and wherein every layer is equipped with respectively four tooth hubs 8.
This invention is by utilizing workpiece load-bearing inner washer 5 and workpiece outer washer 6 to feed, and during high temperature carburizing, workpiece load-bearing inner washer 5 is by the position the strongest with thickness of workpiece, i.e. tooth hub kickboard 10 contacts to reduce the workpiece deformation that the influence of gravity of tooth hub causes.Simultaneously, under the effect of workpiece load-bearing inner washer 5, make the tooth hub directly not contact with workpiece outer washer 6.During quenching, quenching oil is from charging basket below to cocycle, the liquidity of quenching oil when workpiece outer washer 6 can reduce workpiece quenching, annular outer round platform 9 can further reduce the workpiece position that approaches with it, be the speed of cooling of tooth hub male spline, thus the cooling equilibrium degree of balanced workpiece male spline 7.
The present invention has reduced the distortion at workpiece male spline 7 positions effectively by the effect of two packing rings, utilize simultaneously the atmosphere good fluidity of carburizing tinuous production, the characteristics that the quenching tank oil reserve is large, speed of cooling is stable, can select to hang down the key process parameters such as carburizing temperature and quenching temperature.Make workpiece guarantee that whole cementation zone is even, in the good situation of metallographic structure, the processing parameters such as the carburizing temperature by reducing workpiece and quenching temperature effectively weaken the deflection after workpiece carbonization quenches, thereby have improved the finished product accuracy of the type workpiece.
Above-mentioned tooth hub 8 is the 16MnCr5H workpiece, 8 grades of accuracy requirements.Adopt the metallographic result of the tooth hub 8 after the method is processed: workpiece surface hardness HRA80-83, effectively hardened layer is controlled between 0.65-0.8.Martensite and paralympic 1-4 level, carbide 1-4 level, the heart ferrite 1-4 of section level.After thermal treatment, workpiece external tooth precision meets 8 class precisions.
Above one embodiment of the present of invention are had been described in detail, but described content is only preferred embodiment of the present invention, can not be considered to be used to limiting practical range of the present invention.All equalizations of doing according to the present patent application scope change and improve etc., within all should still belonging to patent covering scope of the present invention.
Claims (7)
1. the material basket for heat treatment of a synchromesh gear hub, is characterized in that: comprise charging basket main floor and the workpiece washer sets that is arranged on described charging basket main floor;
Described workpiece washer sets comprises workpiece load-bearing inner washer and is sheathed on the workpiece outer washer in the described workpiece load-bearing inner washer outside, has spacing between described workpiece load-bearing inner washer and described workpiece outer washer.
2. material basket for heat treatment according to claim 1, it is characterized in that: described material basket for heat treatment also comprises an above square position, described charging basket main floor and each described square position are spaced from down to up successively, and be connected by an above charging basket column, be respectively equipped with the above workpiece washer sets on each described square position.
3. material basket for heat treatment according to claim 1 and 2, it is characterized in that: the lower end of described workpiece outer washer is provided with outer lug boss.
4. material basket for heat treatment according to claim 3, it is characterized in that: described workpiece load-bearing inner washer and described workpiece outer washer are annular, and its center of circle coincides, and the described outer lug boss that is arranged at described workpiece outer washer lower end is the annular outer round platform.
5. material basket for heat treatment according to claim 2, it is characterized in that: the quantity of described charging basket column is 4, on described charging basket main floor and each described square position, is equipped with the charging basket coaming plate between every two adjacent described charging basket columns.
6. according to claim 2 or 5 described material basket for heat treatments is characterized in that: the quantity that is arranged at the described workpiece washer sets on described charging basket main floor and each described square position is respectively four.
7. according to claim 2 or 5 described material basket for heat treatments, it is characterized in that: described square position quantity is five.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310337943 CN103382519A (en) | 2013-08-05 | 2013-08-05 | Charging basket for thermal treatment of synchronizer gear hub |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201310337943 CN103382519A (en) | 2013-08-05 | 2013-08-05 | Charging basket for thermal treatment of synchronizer gear hub |
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| CN103382519A true CN103382519A (en) | 2013-11-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105316621A (en) * | 2015-11-19 | 2016-02-10 | 天津天海同步科技有限公司 | Carburization combined assembly structure for planet row transmission gears and heat treatment method |
| CN108994306A (en) * | 2018-07-27 | 2018-12-14 | 广东东睦新材料有限公司 | A kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub |
-
2013
- 2013-08-05 CN CN 201310337943 patent/CN103382519A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105316621A (en) * | 2015-11-19 | 2016-02-10 | 天津天海同步科技有限公司 | Carburization combined assembly structure for planet row transmission gears and heat treatment method |
| CN105316621B (en) * | 2015-11-19 | 2018-02-23 | 天津天海同步科技有限公司 | Total assembling structure and heat treatment method are combined in the carburizing of planet row travelling gear |
| CN108994306A (en) * | 2018-07-27 | 2018-12-14 | 广东东睦新材料有限公司 | A kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub |
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Application publication date: 20131106 |