CN200971373Y - Inductor for iron-base powder melallurgical chain gear induction hardening - Google Patents
Inductor for iron-base powder melallurgical chain gear induction hardening Download PDFInfo
- Publication number
- CN200971373Y CN200971373Y CNU2006200423045U CN200620042304U CN200971373Y CN 200971373 Y CN200971373 Y CN 200971373Y CN U2006200423045 U CNU2006200423045 U CN U2006200423045U CN 200620042304 U CN200620042304 U CN 200620042304U CN 200971373 Y CN200971373 Y CN 200971373Y
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- China
- Prior art keywords
- sprocket wheel
- induction
- inductor
- ring
- quenching
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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
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Abstract
The utility model relates to an inductor for induction quenching of iron base powder metallurgic chain wheel. The inductor comprises a connection head that is connected with heating power supply, and an outer induction ring that has fixing connected with the connection head and can be placed outside outer ring of a chain wheel, an inner induction ring is in the outer induction ring that has fixing connected with the connection head and can be placed on inner ring of the chain wheel. The utility model solves the problem of crack occurred when induction quenching of iron base powder metallurgic chain wheel, and makes the chain wheel able to have large batch production.
Description
Technical field
The utility model relates to the automobile sprocket faces quenching apparatus that ferrous based powder metallurgical is made, particularly a kind of ferrous based powder metallurgical sprocket wheel induction quenching inductor block.
Background technology
The powder metallurgy manufacturing process has material-saving, less energy-consumption, efficient advantages of higher.Under the situation of present automotive industry high speed development, many as far as possible employing powder metallurgy (P/M) parts manufacture the end with reduction, and the competitive power that strengthens manufacturer is had very significance.Because the singularity of powder metallurgy manufacturing process makes part base solid have many holes.Part is easy to generate crackle when quenching.There is motor corporation to adopt conventional inductor block to carry out repeatedly flank of tooth quenching test, all cracks in tooth root portion to the ferrous based powder metallurgical sprocket wheel.
The utility model content
In order to solve a difficult problem that exists in the prior art, the utility model provides a kind of ferrous based powder metallurgical sprocket wheel induction quenching inductor block, and a difficult problem that cracks when solving ferrous based powder metallurgical sprocket wheel induction quenching makes sprocket wheel can enter batch process.
For achieving the above object, design of the present utility model is as follows:
One, the sprocket wheel induction quenching is cracked (Fig. 3) analysis of causes:
(1) because the sprocket wheel material is a powder metallurgy, its inherent porosity causes its intensity to be lower than section bar.
(2) because there is hole in the sprocket wheel material structure, the volume change that thermal expansion is caused when heating greatly reduces.Promptly hole is just pushed in the plastic region thermal expansion in the sprocket wheel outer ring, causes when quench cooled sprocket wheel outer ring volumetric shrinkage and its inner ring not heat entity and forms the volume difference in change, is subjected to tensile stress after making the tooth root incomplete quench.
(3) the sprocket tooth root depth of hardening zone is shallow, makes transition layer be too near to tooth root portion, and promptly tensile stress and stress zone of transition are too near from tooth root, causes root surface and cracks, and also may crack in the transition of stress district.
Two, innovative approach
By above analysis, we improve inductor block, increase an inner ring induction coil, purpose is that the sprocket wheel inner ring obtains adding thermogenesis thermal expansion (below the plasticity temperature) in the time of will making the parts quenching heating, is forced to increase at generation viscous deformation zone circumference when making the heating of sprocket wheel outer ring.Inner ring portion reduces to room temperature prior to the outer ring during cooling, produces Internal and external cycle volume differences (outer imperial palace is little) after the shrinkage, makes outer ring, the back compression chord that quenches.After next adds the inner ring heating inductor, when sprocket wheel heats, reduced the inside thermal conduction in outer ring, tooth root portion quench-hardened case is thickened, moved, left the sensillary area territory of tooth root portion thereby make in stress and the tensile stress zone of transition.Internal temperature outwards conducts the self-tempering effect is also played in the zone of quenching when quenching simultaneously.Finally reach the problem that prevents that sprocket tooth root from cracking when quenching
According to above-mentioned utility model design, the utility model adopts following technical proposals:
A kind of ferrous based powder metallurgical sprocket wheel induction quenching inductor block, comprise a connecting joint that connects heating power supply to fixedly connected with connecting joint and can be placed on the outer induction coil sprocket wheel outer ring outside, it is characterized in that the interior internal induction circle in addition of described outer induction coil also fixedlys connected with described connecting joint and can be disposed on the sprocket wheel inner ring with one.
The utility model compared with prior art, have following conspicuous substantive distinguishing features and advantage: establish an internal induction circle again in the outer induction coil of inductor block of the present utility model the sprocket wheel inner ring is heated simultaneously, reduce tooth root portion internal stress during quenching, thereby avoid producing tooth root portion crackle.Use improvement back inductor block that many sprocket wheels have been carried out induction quenching assay root and do not find have crackle to produce.Its surface hardness 〉=75HR15N, pellet hardness is at 690HK
0.1More than, see accompanying drawing 4, satisfy the other side's technical requirements fully, obtained the quality approval of auto maker.
Description of drawings
Fig. 1 is the ferrous based powder metallurgical sprocket wheel induction quenching inductor block synoptic diagram of prior art.
Fig. 2 is the structural representation of an embodiment of the utility model.
Fig. 3 adopts the existing induction hardened sprocket wheel photo of conventional inductor block figure.
Fig. 4 is the structure iron of the sprocket wheel that quenches among embodiment of the utility model.
Fig. 5 is the gear ring profile of tooth sectional view (being B-B place part sectioned view among Fig. 6) of sprocket wheel shown in Figure 4.
Fig. 6 is the gear ring sectional view (being A-A place sectional view among Fig. 4) of sprocket wheel shown in Figure 4.
Embodiment
The ferrous based powder metallurgical sprocket wheel induction quenching that Fig. 1 illustrates prior art is with the structure of inductor block, adopt after this inductor block quenches sprocket wheel as shown in Figure 3, can see clearly among the figure that tooth root portion cracks.
A preferred embodiment of the present utility model is: referring to Fig. 2, this ferrous based powder metallurgical sprocket wheel induction quenching includes a connecting joint 1 that connects heating power supply with inductor block fixedlys connected with connecting joint 1 with one and can be placed on outer induction coil 2 outside sprocket wheel 3 outer rings, outside described in the induction coil 2 in addition internal induction circle 4 also fixedly connected and can be disposed on sprocket wheel 3 inner rings with described connecting joint 1.
Inductor block of the present utility model is used for Fig. 4, Fig. 5 and ferrous based powder metallurgical sprocket wheel shown in Figure 6 are heat-treated quenching, and its back assay root that quenches is not found have crackle to produce.Its surface hardness 〉=75HR15N, pellet hardness is at 690HK
0.1More than, see accompanying drawing 4, satisfy the other side's technical requirements fully, obtained the quality approval of auto maker.
Claims (1)
1. ferrous based powder metallurgical sprocket wheel induction quenching inductor block, comprise a connecting joint (1) that connects heating power supply and one to fixedly connected and can be placed on outer induction coil (2) outside sprocket wheel (3) outer ring, it is characterized in that the interior internal induction circle (4) in addition of described outer induction coil (2) also fixedlys connected with described connecting joint (1) and can be disposed on sprocket wheel (3) inner ring with connecting joint (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200423045U CN200971373Y (en) | 2006-05-31 | 2006-05-31 | Inductor for iron-base powder melallurgical chain gear induction hardening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200423045U CN200971373Y (en) | 2006-05-31 | 2006-05-31 | Inductor for iron-base powder melallurgical chain gear induction hardening |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200971373Y true CN200971373Y (en) | 2007-11-07 |
Family
ID=38882630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200423045U Expired - Fee Related CN200971373Y (en) | 2006-05-31 | 2006-05-31 | Inductor for iron-base powder melallurgical chain gear induction hardening |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200971373Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104212948A (en) * | 2014-08-21 | 2014-12-17 | 宜兴市永昌轧辊有限公司 | Connector for roller neck quenching inductor and inductive transformer |
-
2006
- 2006-05-31 CN CNU2006200423045U patent/CN200971373Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104212948A (en) * | 2014-08-21 | 2014-12-17 | 宜兴市永昌轧辊有限公司 | Connector for roller neck quenching inductor and inductive transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071107 Termination date: 20140531 |