CN105132633A - Scanning quenching sensor - Google Patents
Scanning quenching sensor Download PDFInfo
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- CN105132633A CN105132633A CN201510673037.5A CN201510673037A CN105132633A CN 105132633 A CN105132633 A CN 105132633A CN 201510673037 A CN201510673037 A CN 201510673037A CN 105132633 A CN105132633 A CN 105132633A
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- inductor block
- circle inductor
- workpiece
- boss
- axle journal
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- 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 a scanning quenching sensor. The scanning quenching sensor comprises an annular upper-turn sensor body, an annular intermediate-turn sensor body and an annular lower-turn sensor body which are connected in series and arrayed in the axial direction of a workpiece, the upper-turn sensor body is provided with a boss used for heating a fillet position, and the boss is provided with a sharp end inclined toward the fillet position. Compared with the prior art, the boss is additionally arranged in the scanning quenching sensor, the boss corresponds to the fillet position, when the workpiece is located at the initial position, a thick shaft neck and the fillet position are subjected to induction heating simultaneously, due to the fact that the sharp end structure of the boss can balance the heating efficiency of the end face and the fillet position, before the end face reaches the melting point, a certain depth of hardening layer is formed at the fillet position, thereby the continuity of the hardening layer is guaranteed, the wear resistance and fatigue strength of the workpiece provided with a suddenly-changing shaft neck are improved, and early failure or fatigue break of the shaft neck is avoided.
Description
Technical field
The present invention relates to equipment for Heating Processing field, particularly relate to a kind of scanning quenching inducer.
Background technology
In the making processes of motorcycle, the crank of engine crankshaft connecting rod complement generally adopts medium carbon alloy steel first to carry out modified pre-treatment, to obtain excellent comprehensive mechanical property, then induction quenching is carried out to axle journal position, obtain higher wear resistance and fatigue strength to make axle journal.
But for the motorcycle crank that some is special, its journal structure is complicated, and excircle dimension suddenlys change, simultaneously in order to meet assembly reliability, the excircle dimension sudden change place corners and fillets size at sudden change axle journal place is all less than normal, brings very large difficulty to induction quenching.
In addition, in order to improve the fatigue strength of axle journal, preventing a part in the middle of axle journal from rupturing, requiring that axle journal entirety carries out induction quenching.In prior art, the method for scanning quenching is usually adopted to quench to axle journal.
As shown in Figure 2, in prior art, scanning quenching inducer comprises induction coil 200, it is inner that workpiece 100 is placed on induction coil 200, in the process of scanning quenching, induction coil 200 position is motionless, and workpiece 100 first stays for some time at starting position, then workpiece 100 from up to down moves and arrives final position always, thus completes scanning quenching.
But, in prior art, because induction coil 200 and end face 103 gap are little, large with the gap of axle journal sudden change place fillet (i.e. fillet place), add end face 103 sharp angle effect and magnetic field, fillet place 104 by end face 103 screening effect, cause the heating efficiency of heating efficiency far below end face 103 of axle journal sudden change place fillet, so the front end face 103 reaching quenching temperature at fillet reaches temperature of fusion, melt to prevent end face 103, the Heating temperature of end face 103 can only be made lower than the temperature of fusion of end face 103, thus the Heating temperature at fillet place 104 is lower than quenching temperature, this place is caused to form quench-hardened case.
In addition, as shown in Figure 3, Fig. 3 is the implementation result figure that quenches in prior art.Because fillet place 104 quench-hardened case has breaking part, cause this position wear resistance and fatigue strength low, thus cause early failure or repeated stress failure.
Therefore, how to ensure the continuity of workpiece axle journal depth of hardening zone, improving wear resistance and the fatigue strength of axle journal, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of scanning quenching inducer, this scanning quenching inducer effectively can solve the scanning induction quenching problem of complex structure, excircle dimension sudden change axle journal, ensure that the continuity of depth of hardening zone, thus improve wear resistance and the fatigue strength of axle journal, avoid axle journal to produce early failure or repeated stress failure.
For solving the problems of the technologies described above, the invention provides following technical scheme:
A kind of scanning quenching inducer, for having the scanning quenching of the workpiece of sudden change axle journal, comprise and to be connected in series and along circle inductor block, middle circle inductor block and lower circle inductor block in the annular of the axial array of described workpiece, it is characterized in that, described upper circle inductor block is provided with the boss at the fillet place for heating described sudden change axle journal, and described boss is provided with the tip tilted to described fillet place.
Preferably, the described inner ring size of upper circle inductor block and the thin journal size of described workpiece and described fillet place matching size close, and described middle circle inductor block and the described inner ring size of lower circle inductor block match with the thick journal size of described workpiece.
Preferably, the distance between described upper circle inductor block and described middle circle inductor block increases with the increase of the sectional dimension difference between the thick axle journal of described workpiece and thin axle journal.
Preferably, described upper circle inductor block, described middle circle inductor block and described lower circle inductor block are all in circular, and described workpiece is positioned at annulus inside.
Preferably, described middle circle inductor block and described lower circle inductor block are formed in one structure.
Preferably, the lower end edge of described lower circle inductor block is circumferentially with multiple spout hole, and the opening of described spout hole is towards described workpiece, and the axis of the bearing of trend of described spout hole and described workpiece has angle.
Preferably, the bearing of trend of described spout hole and the axial angle of described workpiece are 30 ° to 60 °.
Preferably, described boss is the boss of turnery processing.
Preferably, the shape of cross section of described boss is trilateral.
Preferably, described upper circle inductor block, described middle circle inductor block and described lower circle inductor block are copper rod inductor block and in the form of a ring, inside is equipped with the circular channel of Cooling Water circulation, the water coolant of wherein said upper circle inductor block and described middle circle inductor block is for cooling self, the water coolant of described lower circle inductor block namely for cooling workpiece, simultaneously also for cooling itself.
Scanning quenching inducer provided by the present invention, comprise and to be connected in series and along circle inductor block, middle circle inductor block and lower circle inductor block in the annular of the axial array of workpiece, described upper circle inductor block is provided with the boss for heating fillet place, and described boss is provided with the tip tilted to described fillet place.This scanning quenching inducer has set up described boss compared to prior art, described boss is corresponding with position, described fillet place, when described workpiece is positioned at starting position, described thick axle journal and described fillet place carry out induction heating simultaneously, because the cutting-edge structure of described boss can the heating efficiency at balanced end face and described fillet place, before end face does not reach fusing point, described fillet place has formed the quench-hardened case of certain depth, thus ensure the continuity of quench-hardened case, thus improve wear resistance and the fatigue strength of the workpiece with sudden change axle journal, axle journal is avoided to produce early failure or repeated stress failure.
In a preferred embodiment, described upper circle inductor block, described middle circle inductor block and described lower circle inductor block are copper rod inductor block and in the form of a ring, inside is equipped with the circular channel of Cooling Water circulation, the water coolant of wherein said upper circle inductor block and described middle circle inductor block is for cooling inductor block itself, the water coolant of described lower circle inductor block namely for cooling workpiece, simultaneously also for cooling itself.Copper rod has higher electroconductibility, therefore select copper rod better as the material result of inductor block, but, because the intensity of copper rod is lower, easily be out of shape after being heated, therefore by arranging the looping pit of Cooling Water circulation in the inside of described inductor block, be conducive to the temperature reducing copper rod inductor block, avoid in use being out of shape, affect the quenching effect of workpiece.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of workpiece;
Fig. 2 is the structural representation scanning quenching inducer in prior art;
Fig. 3 is the implementation result figure scanning quenching inducer in prior art;
Fig. 4 is the structural representation of a kind of embodiment of scanning quenching inducer provided by the present invention;
Fig. 5 is the enforcement schematic diagram of the starting position of the quenching inducer of scanning shown in Fig. 4;
Fig. 6 is the enforcement schematic diagram of the end position of the quenching inducer of scanning shown in Fig. 4;
Fig. 7 is the implementation result figure of the quenching inducer of scanning shown in Fig. 4;
Wherein: workpiece-100, thick axle journal-101, thin axle journal-102, end face-103, fillet place-104, spline-105, induction coil-200, upper circle inductor block-201, middle circle inductor block-202, lower circle inductor block-203, boss-204, spout hole-205.
Embodiment
Core of the present invention is to provide a kind of scanning quenching inducer, and this scanning quenching inducer can improve the continuity of workpiece depth of hardening zone significantly, thus improves wear resistance and the fatigue strength of axle journal, avoids axle journal to produce early failure or repeated stress failure.
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 4 to Fig. 7, Fig. 4 is the structural representation of a kind of embodiment of scanning quenching inducer provided by the present invention, Fig. 5 and Fig. 6 is respectively the enforcement schematic diagram of scanning quenching inducer starting position and end position shown in Fig. 4, and Fig. 7 is the implementation result figure of the quenching inducer of scanning shown in Fig. 4.
In this embodiment, scanning quenching inducer comprises and to be connected in series and along circle inductor block 201, middle circle inductor block 202 and lower circle inductor block 203 in the annular of the axial array of workpiece 100, and this inductor block is mainly used in the quenching of the workpiece 100 with sudden change axle journal.
As shown in Figure 1, the workpiece 100 with sudden change axle journal comprises thick axle journal 101 and thin axle journal 102, the end of thin axle journal 102 is spline 105, thick axle journal 101 has end face 103 and fillet place 104 with the junction of thin axle journal 102, end face 103 is provided with chamfering away from the place at fillet place 104, fillet size shown in Fig. 1 is R1.5, and the size of chamfering is 1 × 30 °.
For the workpiece 100 of circular shaft type, upper circle inductor block 201, middle circle inductor block 202 and lower circle inductor block 203 are all in circular, and workpiece 100 is positioned at annulus inside.
When needs carry out heating quenching to workpiece 100, workpiece 100 is put into inductor block, wherein, the thick axle journal 101 of workpiece 100 is arranged in the inner ring of circle inductor block 202 and lower circle inductor block 203, the thin axle journal 102 of workpiece 100 is arranged in the inner ring of circle inductor block 201, the upper circle inductor block 201 being positioned at thin axle journal 102 end of workpiece 100 is provided with the boss 204 at the fillet place 104 for heating sudden change axle journal, and boss 204 is provided with the tip tilted to fillet place 104.Preferably, boss 204 can be formed by turnery processing.
Concrete, the shape of cross section of boss 204 can be trilateral, and one of them angle is towards fillet place 104.Certainly, boss 204 can be also other shapes, and most advanced and sophisticated place can have certain chamfering, in order to better heat fillet place 104, the size and dimension at boss 204 and tip can be determined according to the size at the size of end face 103 and fillet place 104, is not further qualified at this.
This scanning quenching inducer has set up boss 204 compared to prior art, boss 204 is corresponding with position, fillet place 104, when workpiece 100 is positioned at starting position, thick axle journal 101 and fillet place 104 carry out induction heating simultaneously, because the cutting-edge structure of boss 204 can the heating efficiency at balanced end face 103 and fillet place 104, before end face 103 does not reach fusing point, fillet place 104 has formed the quench-hardened case of certain depth, thus ensure the continuity of quench-hardened case, thus improve wear resistance and the fatigue strength of the workpiece 100 with sudden change axle journal, axle journal is avoided to produce early failure or repeated stress failure.
Further, the matching size at the inner ring size φ D1 of upper circle inductor block 201 and thin axle journal 102 size of workpiece 100 and fillet place 104 closes, and the inner ring size of middle circle inductor block 202 and lower circle inductor block 203 and thick axle journal 101 matching size of workpiece 100 close.
Concrete, upper circle inductor block 201 inner ring size φ D1, i.e. the inner ring size φ D1 of boss 204, should determine according to the size of thin axle journal 102, when the size of thin axle journal 102 is larger, in order to the use of, the inner ring size φ D1 of boss 204 also should be larger.
Simultaneously, except the size of thin axle journal 102, also need the size considering fillet place 104, when the size at fillet place 104 is less, namely the heating at fillet place 104 more at need, the inner ring size φ D1 of boss 204 should reduce, namely the tip portion of boss 204 and the distance at fillet place 104 is reduced, when the size at fillet place 104 is larger, when namely the heating at fillet place 104 is relatively easy, the inner ring size φ D1 of boss 204 should increase, and namely increases the tip portion of boss 204 and the distance at fillet place 104.
Above-mentioned setting, in concrete operations, should select according to actual needs, while guarantee fillet place 104 heating efficiency, avoids the too fast end face 103 that causes of the rate of heating of end face 103 to melt.
Certainly, the inner ring size φ D2 of upper circle inductor block 201 inner ring size φ D1 and the part of upper circle inductor block 201 except boss 204, can adjust according to the size of thin axle journal 102 and fillet size.
Further, in order to ensure when heating fillet place 104, avoid end face 103 to melt, the distance △ h1 between upper circle inductor block 201 and middle circle inductor block 202 increases with the increase of the sectional dimension difference (i.e. the width of end face 103) between thick axle journal 101 and thin axle journal 102.Difference in size between thick axle journal 101 and thin axle journal 102 is larger, namely the width of end face 103 is larger, △ h1 is larger, avoid the rate of heating of end face 103 excessive, cause end face 103 partial melting, certainly, when the width of end face 103 is less, the distance reduced between circle inductor block 201 and middle circle inductor block 202 that can be suitable.
The height h1 of upper circle inductor block 201 is generally 8-10mm, the height h2 of middle circle inductor block 202 and lower circle inductor block 203 will adjust according to the quenching length of thick axle journal, also middle circle inductor block 202 and lower circle inductor block 203 can be merged into a circle according to the length scale of h2 in addition, namely in, circle inductor block 202 and lower circle inductor block 203 can be two independent parts, also can be formed in one structure, or be divided into 3 circles or more.In the middle of circle inductor block 202 and lower circle inductor block 203 when being two independent parts, distance △ h1 is between the two generally 1mm.
In addition, upper circle inductor block 201, middle circle inductor block 202 and lower circle inductor block 203 can be all the structure that inner ring and outer ring be welded.
In quenching process, the position of this scanning quenching inducer is motionless, workpiece 100 first stays for some time (as shown in Figure 5) at starting position, and then workpiece 100 from up to down moves and arrives final position (as shown in Figure 6) always, thus completes scanning quenching.
Inductor block provided by the present invention, due to boss 204 structure of upper circle inductor block 201, the inner ring diameter φ D1 size of upper circle inductor block 201 and the distance △ h1 size between upper circle inductor block 202 and middle circle inductor block 203, the balanced heating efficiency of end face 103 and fillet place 104, before end face 103 does not reach fusing point, fillet place 104 has formed the quench-hardened case of certain depth, thus ensures the continuity of quench-hardened case.
On the other hand, in order to the workpiece 100 after heating cools timely, complete quenching process, the lower end edge of lower circle inductor block 203 is circumferentially with multiple spout hole 205, the opening of spout hole 205 is towards workpiece 100, and the axis of the bearing of trend of spout hole 205 and workpiece 100 has angle.Setting like this, can ensure the continuity that workpiece 100 cools, thus ensures the continuity of the quench-hardened case of workpiece 100, and as shown in Figure 7, micro-structure distribution is even, does not have breaking part.
Preferably, the bearing of trend of spout hole 205 and the axial angle of workpiece 100 can be 30 ° to 60 °.
Simultaneously, upper circle inductor block 201, middle circle inductor block 202 and lower circle inductor block 203 are copper rod inductor block and in the form of a ring, inside is equipped with the circular channel of Cooling Water circulation, wherein go up the water coolant of circle inductor block 201 and middle circle inductor block 202 for cooling self, i.e. inductor block itself, the water coolant of lower circle inductor block 203 is mainly used in cooling workpiece 100, simultaneously also for cooling itself.
Concrete, upper circle inductor block 201, middle circle inductor block 202 and lower circle inductor block 203 all can be processed by copper rod, and circular channel forms around copper rod turnery processing.
Copper rod has higher electroconductibility, therefore select copper rod better as the material result of inductor block, concrete, red copper can be selected to process, but, because the intensity of red copper is lower, easily be out of shape after being heated, therefore by arranging the looping pit being used for water coolant circulation in the inside of copper rod, be conducive to the temperature reducing copper rod inductor block, avoid in use being out of shape, affect the quenching effect of workpiece 100.Here it should be noted that, looping pit can adopt turnery processing to form equally.
Certainly, the setting of looping pit is not limited to processes on red copper bar, when inductor block selects other materials, also can process looping pit, avoids the temperature of inductor block too high causing to be out of shape.
In the present embodiment, motorcycle crank technical requirements is as follows: spline part bit table surface hardness (50 ~ 60) HRC, quench-hardened case 0.5 ~ 2; All the other portion faces hardness (50 ~ 60) HRC, quench-hardened case 0.8 ~ 3.The implementation result of scanning quenching inducer after completing quenching to workpiece that the present embodiment provides is as follows: spline 105 portion faces hardness is (55 ~ 56) HRC, and quench-hardened case is 1.6 ~ 1.8; All the other portion faces hardness are (53 ~ 58) HRC, and quench-hardened case is 1.1 ~ 2.5.Above-mentioned data all meet the technical requirements of motorcycle crank.
Here it should be noted that, the scanning quenching inducer that the present embodiment provides is not limited to and carries out induction quenching to motorcycle crank, complex-shaped for some, and the workpiece with mutation structure is applicable equally.
The scanning quenching inducer that the present embodiment provides, effectively solves the scanning induction quenching problem of complex structure, excircle dimension sudden change axle journal, ensure that the continuity of depth of hardening zone, thus improve the fatigue strength of axle journal, avoid axle journal to produce repeated stress failure.
In this specification sheets, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
Above scanning quenching inducer provided by the present invention is described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a scanning quenching inducer, for having the scanning quenching of the workpiece (100) of sudden change axle journal, comprise and to be connected in series and along circle inductor block (201), middle circle inductor block (202) and lower circle inductor block (203) in the annular of the axial array of described workpiece (100), it is characterized in that, described upper circle inductor block (201) is provided with the boss (204) at the fillet place (104) for heating described sudden change axle journal, and described boss (204) is provided with the tip tilted to described fillet place (104).
2. scanning quenching inducer according to claim 1, it is characterized in that, the described inner ring size of upper circle inductor block (201) and thin axle journal (102) size of described workpiece (100) and described fillet place (104) matching size close, and described middle circle inductor block (202) and the described inner ring size of lower circle inductor block (203) and thick axle journal (101) matching size of described workpiece (100) close.
3. scanning quenching inducer according to claim 1 and 2, it is characterized in that, the distance between described upper circle inductor block (201) and described middle circle inductor block (202) with the sectional dimension difference between the thick axle journal (101) of described workpiece (100) and thin axle journal (102) increase and increase.
4. scanning quenching inducer according to claim 1, it is characterized in that, described upper circle inductor block (201), described middle circle inductor block (202) and described lower circle inductor block (203) are all in circular, and described workpiece (100) is positioned at annulus inside.
5. scanning quenching inducer according to claim 1, is characterized in that, described middle circle inductor block (202) and described lower circle inductor block (203) are formed in one structure.
6. scanning quenching inducer according to claim 1, it is characterized in that, the lower end edge of described lower circle inductor block (203) is circumferentially with multiple spout hole (205), the opening of described spout hole (205) is towards described workpiece (100), and the axis of the bearing of trend of described spout hole (205) and described workpiece (100) has angle.
7. scanning quenching inducer according to claim 6, is characterized in that, the bearing of trend of described spout hole (205) and the axial angle of described workpiece (100) are 30 ° to 60 °.
8. scanning quenching inducer according to claim 1, is characterized in that, the boss that described boss (204) is turnery processing.
9. scanning quenching inducer according to claim 1, is characterized in that, the shape of cross section of described boss (204) is trilateral.
10. the scanning quenching inducer according to claim 1 to 9 any one, it is characterized in that, described upper circle inductor block (201), described middle circle inductor block (202) and described lower circle inductor block (203) are copper rod inductor block and in the form of a ring, inside is equipped with the circular channel of Cooling Water circulation, the water coolant of wherein said upper circle inductor block (201) and described middle circle inductor block (202) is for cooling self, the water coolant of described lower circle inductor block (203) namely for cooling described workpiece (100), simultaneously also for cooling itself.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510673037.5A CN105132633A (en) | 2015-10-13 | 2015-10-13 | Scanning quenching sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510673037.5A CN105132633A (en) | 2015-10-13 | 2015-10-13 | Scanning quenching sensor |
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| CN105132633A true CN105132633A (en) | 2015-12-09 |
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| CN201510673037.5A Pending CN105132633A (en) | 2015-10-13 | 2015-10-13 | Scanning quenching sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575448A (en) * | 2020-06-16 | 2020-08-25 | 刘胜 | Processing method of shaft |
| CN112609051A (en) * | 2020-11-02 | 2021-04-06 | 中国第一汽车股份有限公司 | Hollow stepped shaft double-journal and transition fillet simultaneous quenching inductor and quenching method |
| CN116004953A (en) * | 2022-12-30 | 2023-04-25 | 重庆长江轴承股份有限公司 | Hub bearing induction quenching inductor |
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| CN103589846A (en) * | 2013-11-05 | 2014-02-19 | 中国第一汽车股份有限公司 | Quenching inductor for double steps of steering joint and quenching method for steering joint |
| CN203559084U (en) * | 2013-09-20 | 2014-04-23 | 中国第一汽车股份有限公司 | Quenching sensor for middle-sized front-drive bridge knuckle shaft |
| CN205170915U (en) * | 2015-10-13 | 2016-04-20 | 青岛德盛机械制造有限公司 | Scanning quenching inductor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201006887Y (en) * | 2007-01-05 | 2008-01-16 | 贵州航天红光机械制造有限公司 | Step axis parts single-circle semi-ring type intermediate frequency induction apparatus |
| CN203559084U (en) * | 2013-09-20 | 2014-04-23 | 中国第一汽车股份有限公司 | Quenching sensor for middle-sized front-drive bridge knuckle shaft |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575448A (en) * | 2020-06-16 | 2020-08-25 | 刘胜 | Processing method of shaft |
| CN112609051A (en) * | 2020-11-02 | 2021-04-06 | 中国第一汽车股份有限公司 | Hollow stepped shaft double-journal and transition fillet simultaneous quenching inductor and quenching method |
| CN116004953A (en) * | 2022-12-30 | 2023-04-25 | 重庆长江轴承股份有限公司 | Hub bearing induction quenching inductor |
| CN116004953B (en) * | 2022-12-30 | 2023-09-05 | 重庆长江轴承股份有限公司 | Hub bearing induction quenching inductor |
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Application publication date: 20151209 |