CN103397161A - Gasket assembly and method for heat treatment on gear hub - Google Patents
Gasket assembly and method for heat treatment on gear hub Download PDFInfo
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- CN103397161A CN103397161A CN2013103378987A CN201310337898A CN103397161A CN 103397161 A CN103397161 A CN 103397161A CN 2013103378987 A CN2013103378987 A CN 2013103378987A CN 201310337898 A CN201310337898 A CN 201310337898A CN 103397161 A CN103397161 A CN 103397161A
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Abstract
The invention provides a gasket assembly for heat treatment on a gear hub. The gasket assembly comprises a workpiece-bearing inner gasket and a workpiece outer gasket sleeved on the workpiece-bearing inner gasket. A distance is formed between the workpiece-bearing inner gasket and the workpiece outer gasket. The workpiece-bearing inner gasket contacts with a gear hub on the workpiece-bearing inner gasket. A gap is formed between the workpiece outer gasket and an external spline end surface of the gear hub. The invention also provides a method which utilizes the gasket assembly for material filling and is used for heat treatment on the filled gear hub. The gear hub is arranged on the gasket assembly and the gear hub filled in the gasket assembly is fed into a carburization continuous production line and then is subjected to heat treatment. The method guarantees uniformity of an integral carburization layer and good quality of a metallographic structure, effectively reduces deflection of a small workpiece subjected to carburizing and quenching, and improves a finished product precision of the workpiece by curing heat treatment parameters.
Description
Technical field
The invention belongs to the metal heat treatmet technical field, the thermal treatment that relates to a kind of tooth hub is with washer sets and heat treating method.
Background technology
For the carburizing and quenching of high to low gear toothholder in heavy type lorry transmission-gear box synchronizer product, process the basic case-hardening furnace that adopts 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 while mounting overproof serious, and while 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 thermal treatment that the problem to be solved in the present invention is to provide a kind of tooth hub with washer sets and heat treating method, 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 thermal treatment washer sets of tooth hub, comprise workpiece load-bearing inner washer and the workpiece outer washer that is sheathed on the described workpiece load-bearing inner washer outside, between described workpiece load-bearing inner washer and described workpiece outer washer, have spacing;
Described workpiece load-bearing inner washer contacts with the tooth hub of the side of being located thereon, and between the male spline end face of described workpiece outer washer and described tooth hub, has gap.
The present invention can also adopt following technical measures:
Described workpiece load-bearing inner washer contacts with the kickboard of described tooth hub.Described kickboard is the position of described tooth hub thickness and weight maximum.
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 present invention also provides a kind of and utilizes above-mentioned thermal treatment with washer sets charging method that the tooth hub of packing into is heat-treated: described tooth hub is placed in to described washer sets top, described workpiece load-bearing inner washer is contacted with the kickboard of described tooth hub, between the male spline end face of described workpiece outer washer and described tooth hub, have gap; The described tooth hub of the described washer sets of packing into is put into the carburizing tinuous production and is heat-treated.
Further, described thermal treatment is arranged on the charging basket main floor of charging basket with washer sets.
Further, described charging basket 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, on described square position, is equipped with described thermal treatment washer sets.
Further, above-mentioned heat treating method specifically comprises the following steps:
(1) described tooth hub is lain in to described thermal treatment with on washer sets, described tooth hub is not directly contacted with each described square position with described charging basket main floor;
(2) debinding furnace of charged described charging basket in step (1) being put into to the carburizing tinuous production carries out preheating, degreasing;
(3) put into main stove and carry out carburizing;
(4) after carburizing, described tooth hub is quenched;
(5) utilize cleaning machine to clean;
(6) put into the tempering stove tempering;
(7) discharging.
Further, a described charging basket was put into to described carburizing tinuous production in every 34 minutes, preheating temperature is 360-380 ℃, carburizing temperature is 880-890 ℃, and carbon potential is 1.0-1.05, and quenching temperature is 800-810 ℃, cool time is 10-12 minute, and tempering temperature is 170-180 ℃.
Further, described workpiece load-bearing inner washer and described workpiece outer washer are annular, and its center of circle coincides, and the lower end of described workpiece outer washer is provided with the annular outer round platform.
Advantage and positively effect that the present invention has are: the invention enables workpiece guaranteeing that whole cementation zone is even, in the good situation of metallographic structure, by using after inside and outside two kinds of packing rings balanced work-piece cools speed effectively to reduce heat treatment deformation with this, solidify some heat treatment parameters (as shove charge number of packages, temperature etc.) thus can improve, stablize the precision of workpiece.
The accompanying drawing explanation
Fig. 1 is side-view and the front view thereof of high and low shift tooth hub
Fig. 2 is the described structural representation of thermal treatment with the charging basket of washer sets that be provided with 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 Fig. 2, shown in 3, the invention provides a kind of thermal treatment washer sets of tooth hub 8, comprise workpiece load-bearing inner washer 5 and the workpiece outer washer 6 that is sheathed on workpiece load-bearing inner washer 5 outsides, between workpiece load-bearing inner washer 5 and workpiece outer washer 6, there is spacing, and after making tooth hub 8 be placed on workpiece load-bearing inner washer 5, workpiece load-bearing inner washer 5 contacts with the kickboard 10 of tooth hub 8, workpiece outer washer 6 is that gap is left at the seam plane of major diameter packing ring and the male spline 7 tooth positions of tooth hub 8, thereby in carburizing, in the middle of quenching process, can effectively reduce the impact of gravity on this tooth position distortion.Workpiece load-bearing inner washer 5 and workpiece outer washer 6 are annular, and its center of circle coincides, and workpiece outer washer 6 lower ends are provided with annular outer round platform 9.
Above-mentioned thermal treatment is arranged on charging basket with washer sets.Charging basket comprises charging basket main floor 1 and five square positions 2, and charging basket main floor 1 and each square position 2 are spaced from down to up successively, and is connected by four charging basket columns 4, on charging basket main floor 1 and each square position 2, is respectively equipped with four thermal treatment washer sets.On charging basket main floor 1 and each square position 2, between every two adjacent charging basket columns 4, be equipped with charging basket coaming plate 3, and surround rectangle.
The present invention also provides a kind of and utilizes above-mentioned thermal treatment with washer sets charging method that the tooth hub 8 of packing into is heat-treated: tooth hub 8 is placed in to each washer sets top, workpiece load-bearing inner washer 5 is contacted with the kickboard 10 of tooth hub 8, between male spline 7 end faces of workpiece outer washer 6 and tooth hub 8, have gap.A charging basket that installs tooth hub 8 was put into to 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 each thermal treatment with on washer sets by tooth hub 8, 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 to the carburizing tinuous production carries out preheating, degreasing, and preheating temperature is 360-380 ℃; In debinding furnace, have 4 basket positions, be 34 minutes * 4=136 minute warm up time;
(3) put into main stove and carry out carburizing, carburizing temperature is 880-890 ℃; In main stove, have 16 basket positions, 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 ℃; In tempering stove, have 6 basket positions, tempering time is 34 * 6=204 minute;
(7) discharging.
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 with the thickness of workpiece maximum, i.e. tooth hub kickboard 10 contacts to reduce the workpiece deformation that the influence of gravity of tooth hub 8 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 the 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 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 ferrite 1-4 of heart 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 (10)
1. the thermal treatment washer sets of a tooth hub, is characterized in that: comprise workpiece load-bearing inner washer and the workpiece outer washer that is sheathed on the described workpiece load-bearing inner washer outside, between described workpiece load-bearing inner washer and described workpiece outer washer, have spacing;
Described workpiece load-bearing inner washer contacts with the tooth hub of the side of being located thereon, and between the male spline end face of described workpiece outer washer and described tooth hub, has gap.
2. thermal treatment washer sets according to claim 1, it is characterized in that: described workpiece load-bearing inner washer contacts with the kickboard of described tooth hub.
3. thermal treatment washer sets according to claim 1, it is characterized in that: the lower end of described workpiece outer washer is provided with outer lug boss.
4. thermal treatment washer sets 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. one kind is utilized thermal treatment claimed in claim 1 with washer sets charging method that the tooth hub of packing into is heat-treated, it is characterized in that, described tooth hub is placed in to described washer sets top, described workpiece load-bearing inner washer is contacted with the kickboard of described tooth hub, between the male spline end face of described workpiece outer washer and described tooth hub, have gap; The described tooth hub of the described washer sets of packing into is put into the carburizing tinuous production and is heat-treated.
6. heat treating method according to claim 5, it is characterized in that: described thermal treatment is arranged on the charging basket main floor of charging basket with washer sets.
7. heat treating method according to claim 6, it is characterized in that: described charging basket 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, on described square position, be equipped with described thermal treatment washer sets.
8. according to claim 6 or 7 described heat treating methods, is characterized in that, comprises the following steps:
(1) described tooth hub is lain in to described thermal treatment with on washer sets, described tooth hub is not directly contacted with described charging basket main floor;
(2) debinding furnace of charged described charging basket in step (1) being put into to the carburizing tinuous production carries out preheating, degreasing;
(3) put into main stove and carry out carburizing;
(4) after carburizing, described tooth hub is quenched;
(5) utilize cleaning machine to clean;
(6) put into the tempering stove tempering;
(7) discharging.
9. heat treating method according to claim 8, it is characterized in that: a described charging basket was put into to described carburizing tinuous production in every 34 minutes, preheating temperature is 360-380 ℃, carburizing temperature is 880-890 ℃, carbon potential is 1.0-1.05, quenching temperature is 800-810 ℃, and the cool time is 10-12 minute, and tempering temperature is 170-180 ℃.
10. heat treating method according to claim 5, 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 lower end of described workpiece outer washer is provided with the annular outer round platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310337898.7A CN103397161B (en) | 2013-08-05 | 2013-08-05 | Gasket assembly and method for heat treatment on gear hub |
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| CN201310337898.7A CN103397161B (en) | 2013-08-05 | 2013-08-05 | Gasket assembly and method for heat treatment on gear hub |
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| CN103397161A true CN103397161A (en) | 2013-11-20 |
| CN103397161B CN103397161B (en) | 2015-03-04 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0282822A1 (en) * | 1987-03-16 | 1988-09-21 | Siemens Aktiengesellschaft | Process for producing turbine wheels discs with locally raised internal stresses in the hub bore |
| CN202107740U (en) * | 2011-06-17 | 2012-01-11 | 天津第一机床总厂 | Lifting tool for carburizing and quenching large gear |
| CN203487198U (en) * | 2013-08-05 | 2014-03-19 | 天津天海同步科技股份有限公司 | Gasket group for thermal treatment on gear hub |
-
2013
- 2013-08-05 CN CN201310337898.7A patent/CN103397161B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0282822A1 (en) * | 1987-03-16 | 1988-09-21 | Siemens Aktiengesellschaft | Process for producing turbine wheels discs with locally raised internal stresses in the hub bore |
| CN202107740U (en) * | 2011-06-17 | 2012-01-11 | 天津第一机床总厂 | Lifting tool for carburizing and quenching large gear |
| CN203487198U (en) * | 2013-08-05 | 2014-03-19 | 天津天海同步科技股份有限公司 | Gasket group for thermal treatment on gear hub |
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| CN103397161B (en) | 2015-03-04 |
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Address after: 301600 Jinhai Road, Jinghai Development Zone, Jinghai County, Tianjin 5 Patentee after: TIANJIN TANHAS TECHNOLOGY CO., LTD. Address before: 301600 Jinhai Road, Jinghai Development Zone, Jinghai County, Tianjin 5 Patentee before: Tianjin Tanhas Technology Co., Ltd. |