CN103397161B - 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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- CN103397161B CN103397161B CN201310337898.7A CN201310337898A CN103397161B CN 103397161 B CN103397161 B CN 103397161B CN 201310337898 A CN201310337898 A CN 201310337898A CN 103397161 B CN103397161 B CN 103397161B
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- tooth hub
- bearing inner
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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 technical field of metal heat treatment, relate to a kind of thermal treatment washer sets and heat treating method of tooth hub.
Background technology
Substantially adopt case-hardening furnace to carry out for the carburizing and quenching process of high to low gear toothholder in heavy type lorry transmission-gear box synchronizer product at present, its charging mode can select the mode of mounting or paperback mode.But for the workpiece shown in Fig. 1, the distortion after its carburizing and quenching is all very serious for a long time.Be mainly reflected in and adopt the ovality of workpiece when mounting seriously overproof, and when granting is put down in employing, the planeness of workpiece is seriously overproof, the especially very large tapering of male spline meeting bad student of workpiece, time serious, tapering is more than more than 0.50.Not obvious by effect after adjustment 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 thermal treatment washer sets and heat treating method of tooth hub, is especially 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 be sheathed on the workpiece outer washer outside described workpiece load-bearing inner washer, between described workpiece load-bearing inner washer and described workpiece outer washer, there is spacing;
Described workpiece load-bearing inner washer contacts with the tooth hub of the side of being located thereon, and there is 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 workpiece load-bearing inner washer contacts with the kickboard of described tooth hub.Described kickboard is the maximum position of described tooth hub thickness and weight.
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 being arranged at described workpiece outer washer lower end is annular outer round platform.
The present invention also provides a kind of and utilizes above-mentioned thermal treatment washer sets to feed and the method for heat-treating the tooth hub loaded: be placed in above described washer sets by described tooth hub, 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, there is gap; The described tooth hub loading described washer sets is put into carburizing tinuous production heat-treat.
Further, described thermal treatment washer sets is arranged on the charging basket main floor of charging basket.
Further, described charging basket comprises more than one square position, and described charging basket main floor and square position described in each are spaced from down to up successively, and are connected by more than one charging basket column, described square position are 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 described thermal treatment washer sets, described tooth hub is not directly contacted with square position described in each with described charging basket main floor;
(2) debinding furnace that described charging basket charged in step (1) puts into carburizing tinuous production is carried out preheating, degreasing;
(3) put into main stove and carry out carburizing;
(4) after carburizing, described tooth hub is quenched;
(5) cleaning machine is utilized to clean;
(6) tempering stove tempering is put into;
(7) discharging.
Further, a described charging basket was put into described carburizing tinuous production in every 34 minutes, preheating temperature is 360-380 DEG C, carburizing temperature is 880-890 DEG C, and carbon potential is 1.0-1.05, and quenching temperature is 800-810 DEG C, cool time is 10-12 minute, and tempering temperature is 170-180 DEG C.
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 annular outer round platform.
The advantage that the present invention has and positively effect are: the invention enables workpiece even at the overall cementation zone of guarantee, when metallographic structure is good, effectively balanced work-piece cools speed can reduce heat treatment deformation with this after using inside and outside two kinds of packing rings, solidify some heat treatment parameters (as shove charge number of packages, temperature etc.) thus can improve, stablize the precision of workpiece.
Accompanying drawing explanation
Fig. 1 is side-view and the front view thereof of high and low shift tooth hub
Fig. 2 is the structural representation of the charging basket being provided with thermal treatment washer sets described in the embodiment of the present invention
Fig. 3 is the vertical view of Fig. 2
Fig. 4 is the enlarged schematic partial view 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, the workpiece outer washer 6 comprising workpiece load-bearing inner washer 5 and be sheathed on outside workpiece load-bearing inner washer 5, spacing is there is between workpiece load-bearing inner washer 5 and workpiece outer washer 6, and tooth hub 8 is placed on after on workpiece load-bearing inner washer 5, workpiece load-bearing inner washer 5 contacts with the kickboard 10 of tooth hub 8, gap is left in the male spline 7 teeth portion position of the workpiece outer washer 6 i.e. seam plane of major diameter packing ring and tooth hub 8, thus in carburizing, in the middle of quenching process, effectively can reduce the impact of gravity on this tooth position distortions.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 end is provided with annular outer round platform 9.
Above-mentioned thermal treatment washer sets is arranged on charging basket.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, and charging basket main floor 1 and each square position 2 are respectively equipped with four thermal treatment washer sets.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 present invention also provides a kind of and utilizes above-mentioned thermal treatment washer sets to feed and the method for heat-treating the tooth hub 8 loaded: be placed in by tooth hub 8 above each washer sets, workpiece load-bearing inner washer 5 is contacted with the kickboard 10 of tooth hub 8, between male spline 7 end face of workpiece outer washer 6 and tooth hub 8, there is gap.The charging basket one being installed in every 34 minutes tooth hub 8 is put into carburizing tinuous production and is heat-treated, and specifically comprises the following steps,
(1) tooth hub structure as shown in Figure 1, lain in each thermal treatment 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 charged charging basket in step (1) being put into carburizing tinuous production carries out preheating, degreasing, and preheating temperature is 360-380 DEG C; Have 4 basket positions in debinding furnace, warm up time is 34 minutes × 4=136 minute;
(3) put into main stove and carry out carburizing, carburizing temperature is 880-890 DEG C; Have 16 basket positions in main stove, carburizing time is 34 minutes × 16=544 minute, and carbon potential is 1.0-1.05;
(4) quench to tooth hub 8 after carburizing, quenching temperature is 800-810 DEG C, and the cool time is 10-12 minute;
(5) cleaning machine is utilized to clean;
(6) put into tempering stove tempering, tempering temperature is 170-180 DEG C; Have 6 basket positions in tempering stove, tempering time is 34 × 6=204 minute;
(7) discharging.
This invention is feeded by utilizing workpiece load-bearing inner washer 5 and workpiece outer washer 6, during high temperature carburizing, workpiece load-bearing inner washer 5 by the position maximum with thickness of workpiece, i.e. tooth hub kickboard 10, the workpiece deformation that the influence of gravity contacting to reduce tooth hub 8 causes.Meanwhile, under the effect of workpiece load-bearing inner washer 5, tooth hub is not directly contacted with workpiece outer washer 6.During quenching, quenching oil from below charging basket to cocycle, the liquidity of quenching oil time workpiece outer washer 6 can reduce workpiece quenching, annular outer round platform 9 can reduce workpiece position close with it further, the i.e. speed of cooling of tooth hub male spline, thus the cooling equilibrium degree of balanced workpiece male spline 7.
The present invention significantly reduces the distortion at workpiece male spline 7 position by the effect of two packing rings, utilize the atmosphere good fluidity of carburizing tinuous production, quenching tank oil reserve is large, speed of cooling is stable feature simultaneously, the key process parameters such as lower carburizing temperature and quenching temperature can be selected.Make workpiece even at the overall cementation zone of guarantee, when metallographic structure is good, by reducing the processing parameters such as the carburizing temperature of workpiece and quenching temperature, effectively weakens the deflection after workpiece carbonization quenching, thus improve the finished product accuracy of the type workpiece.
Above-mentioned tooth hub 8 is 16MnCr5H workpiece, accuracy requirement 8 grades.Adopt the metallographic result of the tooth hub 8 after the method processing: workpiece surface hardness HRA80-83, effective hardness layer controls between 0.65-0.8.Martensite and paralympic 1-4 level, carbide 1-4 level, heart portion ferrite 1-4 level.After thermal treatment, workpiece external tooth precision meets 8 class precisions.
Above one embodiment of the present of invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.
Claims (8)
1. a thermal treatment washer sets for tooth hub, is characterized in that: comprise workpiece load-bearing inner washer and be sheathed on the workpiece outer washer outside described workpiece load-bearing inner washer, there is spacing between described workpiece load-bearing inner washer and described workpiece outer washer;
Described workpiece load-bearing inner washer contacts with the tooth hub of the side of being located thereon, and there is gap between the male spline end face of described workpiece outer washer and described tooth hub;
Described workpiece load-bearing inner washer contacts with the kickboard of described tooth hub;
The lower end of described workpiece outer washer is provided with outer lug boss.
2. thermal treatment washer sets according to claim 1, it is characterized in that: described workpiece load-bearing inner washer and described workpiece outer washer are annular, and its center of circle coincides, the described outer lug boss being arranged at described workpiece outer washer lower end is annular outer round platform.
3. one kind utilizes the thermal treatment washer sets described in claim 1 to feed and the method for heat-treating the tooth hub loaded, it is characterized in that, described tooth hub is placed in above described washer sets, 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, there is gap; The described tooth hub loading described washer sets is put into carburizing tinuous production heat-treat.
4. heat treating method according to claim 3, is characterized in that: described thermal treatment washer sets is arranged on the charging basket main floor of charging basket.
5. heat treating method according to claim 4, it is characterized in that: described charging basket comprises more than one square position, described charging basket main floor and square position described in each are spaced from down to up successively, and be connected by more than one charging basket column, described square position is equipped with described thermal treatment washer sets.
6. the heat treating method according to claim 4 or 5, is characterized in that, comprises the following steps:
(1) described tooth hub is lain in described thermal treatment washer sets, described tooth hub is not directly contacted with described charging basket main floor;
(2) debinding furnace that described charging basket charged in step (1) puts into carburizing tinuous production is carried out preheating, degreasing;
(3) put into main stove and carry out carburizing;
(4) after carburizing, described tooth hub is quenched;
(5) cleaning machine is utilized to clean;
(6) tempering stove tempering is put into;
(7) discharging.
7. heat treating method according to claim 6, it is characterized in that: a described charging basket was put into described carburizing tinuous production in every 34 minutes, preheating temperature is 360-380 DEG C, carburizing temperature is 880-890 DEG C, carbon potential is 1.0-1.05, quenching temperature is 800-810 DEG C, and the cool time is 10-12 minute, and tempering temperature is 170-180 DEG C.
8. heat treating method according to claim 3, 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 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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
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| CN103397161A CN103397161A (en) | 2013-11-20 |
| CN103397161B true CN103397161B (en) | 2015-03-04 |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3708507A1 (en) * | 1987-03-16 | 1988-09-29 | Siemens Ag | METHOD FOR PRODUCING TURBINE WHEEL DISCS WITH LOCAL HIGH PRESSURE TENSIONS IN THE HUB HOLE |
| 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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