CN1044387C - Method for medium frequency quenching cam - Google Patents
Method for medium frequency quenching cam Download PDFInfo
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- CN1044387C CN1044387C CN96109918A CN96109918A CN1044387C CN 1044387 C CN1044387 C CN 1044387C CN 96109918 A CN96109918 A CN 96109918A CN 96109918 A CN96109918 A CN 96109918A CN 1044387 C CN1044387 C CN 1044387C
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- cam
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- base circle
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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
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Abstract
The present invention relates to a new medium-frequency quenching method of a cam. The working profile surface of the cam is uniformly heated in a base circle preheating method. The new medium-frequency quenching method is characterized in that the center of the cam base circle is externally moved from the rotation center of a workpiece so that the base circle surface is at a distance of 3mm to 5mm to be close to an induction coil; the cam is swung left and right after energized so that the base circle surface of the cam, a lift range position of a peach part of the base circle surface and a lower range position of the peach part of the base circle surface are correspondingly heated; the center of the cam is repositioned when the temperature of the base circle surface reaches the quenching temperature of 910 to 950DEG C, and the peach part of the cam starts to be rotatablely heated for 3 to 4 seconds so that the temperatures of the whole working profile surface of the cam is uniform. The method overcomes the heat treatment defects of quenching cracks, overheating, soft spots, etc. caused by ununiform heating temperatures and inconsistent hardnesses of the existing cam in a circular induction coil.
Description
The present invention relates to a kind of cam medium frequency quenching novel method, the circular induction coil of this method utilization heats the cam work profile.
When cam (axle) class part carries out the surface heat processing at present, heating means middle and high frequency induction coil heating commonly used.The induction coil cam thermal treatment quality that in induction heating thermal treatment, is directly connected to whether reasonable in design.Induction coil roughly is divided into two big classes, and a class is the profiling induction coil, and another kind of is circular induction coil.In general the profiling induction coil has three main drawbacks: 1, the overheated easily or ablation in cam rise position; 2, make difficult cost height; 3, easily produce soft spots or soft band.Therefore manufacturing and designing very difficult normal use the in back, its success ratio and reliability are all little.And circular induction coil is all very convenient simple aspect design, manufacturing and use.But circular induction coil is in use, because cam work profile radius-of-curvature difference everywhere, the local temperature big in radius-of-curvature is low, and the little just high even fusing of local temperature of radius-of-curvature.The temperature of cam face was very inhomogeneous when cam heated in circular induction coil, and the hardness of the back cam work profile of quenching so also is very inhomogeneous, thereby quenching stress (compressive pre-stress) distribution is uneven equally.Owing to these reasons, be easy to produce heat treating faults such as quenching crack, overheated, soft spots.The result does not just reach the heat treated technical requirements of cam, and even without cracking, also shortened greatly the work-ing life of cam.
Purpose of the present invention is intended to overcome the deficiency of above-mentioned prior art and a kind of solution cam inhomogeneity cam medium frequency quenching of Heating temperature novel method in circular induction coil is provided, and this method is called the basic circle preheating method again.
It is a kind of more satisfactory method that the basic circle preheating method heats in circular induction coil for cam.It can make cam work profile temperature reach basic uniformity (temperature head is not more than 20 ℃), accomplished this point add control some comprehensive quenching conditionss, cam medium frequency quenching quality just is guaranteed fully, below the technological process of " basic circle preheating method " is made a presentation in detail.
Cam medium frequency quenching novel method is that cam is placed in the circular induction coil, energising heating cam work profile, after reaching quenching temperature, the cooling of outage water spray is quenched, these method characteristics are to adopt the basic circle preheating method that S is moved by workpiece center of turning circle 0 position in the cam base circle center to make the basic circle surface near induction coil apart from being positioned at eccentric 0 ' position, cam swings after the energising, make cam base circle and lift thereof and fall the journey position and obtain corresponding heating, when reaching quenching temperature, the basic circle surface make cam reset to workpiece center of turning circle 0 position, and begin rotation heating cam part 3-4 second, make evenly back outage water spray Cooling Quenching of cam work profile temperature.Present method moves to eccentric 0 ' position with cam base circle by center of turning circle O position, near to induction coil 3-5mm apart from the time, energising back basic circle is heated very soon, this moment, cam part was because slower from induction coil rate of heating far away.Operator grasps cam stationary shaft swings, and makes cam rise and fall the journey two sides also correspondingly to be heated.When basic circle reaches quenching temperature 910-950 ℃, cam is reset to workpiece center of turning circle 0 position (want The faster the better) fast, in reseting procedure, proceed heating.Begin rotation heating cam part behind the cam return, because cam part also has been heated to certain temperature in the basic circle warm, so it is just very even that cam begins to rotate the temperature of whole basically work profile about 3-4 second of back, makes whole cam work profile temperature reach 930 ℃.After the outage, water spray cooling (medium carbon structure steel system cam does not adopt the delayed quenching method) at once, this moment, cam continued rotation, finish until cooling, the workpiece outlet temperature is controlled at 120-150 ℃, but must not be greater than 150 ℃, stop water spray and take off cam, quenching process finishes.Reach the heat treated high quality of cam and also should guarantee following requirement:
1, necessary rounding of the corner angle on cam both sides or chamfering, fillet or chamfer dimesion are the bigger the better under technical qualification permission situation.
2, should carry out normalizing treatment behind the cam blank forging.
3, the cam blank should carry out modifier treatment after roughing, and hardness is HB235-269, and metallographic structure is a sorbite.
4, adopt 45,50, the cam that medium carbon structure steel materials such as 50Mn are made, its quenching temperature all adopts 910-930 ℃, and the back hardness of quenching is HRC60-64.
The selection of 5, quenching specific power
Cam heats in middle and high frequency equipment, rate of heating is very high, though this helps boosting productivity, but the composition of resultant austenite structure is very uneven in extremely short heat-up time, hardness, stress distribution etc. were all unfavorable after this quenched to cam, so should be suitably littler when selecting the heating specific power, can select 0.5-0.6kw/cm for use
2Can make heat-up time a little longer like this, austenitic alloying and homogenizing all are beneficial to.
6, cooling should remain on 0.2-0.23MPa for well with the pressure of spraying water, and hydraulic pressure should remain unchanged in whole quench cooled process.
The speed of rotation of workpiece when 7, spraying water
To correctly select workpiece in induction coil, to cool off speed of rotation.For complex-shaped cam, speed of rotation is high more during cooling because that cam rise suction function behind cools off on the contrary is inhomogeneous more, therefore the control of the speed of rotation of workpiece low be favourable to even cooling.In present method, speed of rotation during less than 100mm, is controlled at 30-40r/min at the cam turning radius; The cam turning radius is controlled at 20-30r/min during greater than 100mm.
8, prevent the measure of hardening break
(1) add the polyvinyl alcohol of 0.3-0.32% in water coolant, the cooling power of this solution is between water and oil.Concerning general medium carbon structure steel, can play and prevent cracking role.
(1) coolant temperature should be advisable between 20-40 ℃, especially winter medium temperature more want strict control, cam is very easy to crack during as the too low then quench cooled of coolant temperature.
The produced cam of medium frequency quenching is carried out in every employing " basic circle preheating method ", has all reached heat treated technical requirements fully.This method heats in circular inductor block as a kind of rotary work piece, and it has two characteristics: 1. cam work profile Heating temperature is very even, and this point is the induction quenching key of success, utilizes this law to solve this problem rightly.2. improved the quality that cam quenches, reduced the scrap rate that quenches, by 1 times of the work-ing life (the general medium carbon structure steel system cam life-span is 2.5 years) that this law is quenched and to have been prolonged cam, prevented the partial contact fatigue of cam work profile and peeling off in early days of producing and cause the cam inefficacy.
Ship engine air inlet and exhaust valve double-linked cam, cam is subjected to the bump of roller when the commutation of pulling camshaft, its lift position of cam by the manufacturing of old technology method is often broken, have a strong impact on the works better of cam even scrapped, used the double-linked cam of " basic circle preheating method " technology manufacturing to solve this difficult problem.In addition owing to, in use often lost efficacy prematurely with inhomogeneous soft spots or the soft band of existing of the cam work profile hardness of old technology manufacturing.With the cam of this manufactured, because work type surface hardness and stress distribution are even, contact fatigue strength improves greatly, has prolonged work-ing life and turnaround, has reduced the dismounting labor force, thereby has remarkable economic efficiency and social benefit.
Fig. 1 is cam rotation of the present invention present position synoptic diagram.
Fig. 2 is for cam center direction of displacement of the present invention with apart from synoptic diagram.
Among the figure: 1. transformer 2. induction coils 3. cams
Introduce the specific embodiment of the invention below.
(1) before the heating of quenching, earlier cam base circle (is seen Fig. 1, Fig. 2) moved near the about 3mm of induction coil place by direction as shown.
(2) begin energising, operator grasps cam stationary shaft swings, and cam part (lift and fall journey) two sides are also correspondingly heated.When the basic circle surface temperature reaches 930 ℃ of quenching temperatures, the cam base circle center is reset to workpiece center of turning circle 0 position (want The faster the better) fast, in reseting procedure, proceed heating.
(3) begin rotation heating cam part behind the cam return, because the cam peach all also has been heated to certain temperature in the basic circle warm, so it is just very even that cam begins to rotate the temperature of whole basically work profile about 3-4 second of back, makes whole cam work profile temperature reach 930 ℃.
(4) after the outage, water spray cooling (medium carbon structure steel system cam does not adopt the delayed quenching method) at once, this moment, cam continued rotation, finished until cooling, and the workpiece outlet temperature is controlled at 120 ℃, stops water spray and takes off cam, and quenching process finishes.
In the present embodiment, the quenching specific power is 0.5kw/cm
2, cooling water spray pressure is 0.2MPa; Diameter of work during less than 100mm Workpiece Rotating speed be 35r/min; Diameter of work is during greater than 100mm, and Workpiece Rotating speed is 25r/min; Add 0.3% polyvinyl alcohol in the heat-eliminating medium, and its temperature is controlled at 30 ℃.
Claims (8)
1. cam medium frequency quenching method, cam [3] is placed in the circular induction coil [2], energising heating cam work profile, after reaching quenching temperature, the cooling of outage water spray is quenched, these method characteristics are to adopt " basic circle preheating method " that S is moved by workpiece center of turning circle 0 position in cam [3] basic circle center to make the basic circle surface near induction coil [2] apart from being positioned at eccentric 0 ' position, cam swings after the energising, make cam base circle and lift thereof and fall the journey position and obtain corresponding heating, when reaching quenching temperature, the basic circle surface make the cam base circle center reset to workpiece center of turning circle position, and begin rotation heating cam part 3-4 second, make evenly back outage water spray Cooling Quenching of cam work profile temperature.
2. method according to claim 1 is characterized in that this method quenching temperature is controlled in the 910-950 ℃ of scope, and the water spray cooling temperature is controlled in the 120-150 ℃ of scope.
3. method according to claim 1 is characterized in that this method quenching specific power is 0.5-0.6kw/cm
2
4. method according to claim 1 is characterized in that this method cooling water spray pressure is 0.2-0.23MPa.
5. method according to claim 1 is characterized in that this method speed of rotation is controlled at 30-40r/min during less than 100mm at the cam turning radius, and the cam turning radius is controlled at 20-30r/min during greater than 100mm.
6. according to claim 1 or 4 described methods, be characterized in containing in this method water coolant the polyvinyl alcohol of 0.3-0.32%.
7. method according to claim 6 is characterized in that this method coolant temperature is between 20-40 ℃.
8. method according to claim 1, be characterized in that this method moves S distance with workpiece center of turning circle position after, the cam base circle surface is moved near the about 3-5mm of induction coil place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96109918A CN1044387C (en) | 1996-07-05 | 1996-07-05 | Method for medium frequency quenching cam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96109918A CN1044387C (en) | 1996-07-05 | 1996-07-05 | Method for medium frequency quenching cam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1148091A CN1148091A (en) | 1997-04-23 |
| CN1044387C true CN1044387C (en) | 1999-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96109918A Expired - Fee Related CN1044387C (en) | 1996-07-05 | 1996-07-05 | Method for medium frequency quenching cam |
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| Country | Link |
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| CN (1) | CN1044387C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101509062A (en) * | 2009-03-27 | 2009-08-19 | 中国第一汽车集团公司 | Method for quenching end socket ribbet position of assembled camshaft |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101838729B (en) * | 2009-03-20 | 2012-06-27 | 王锦堂 | Sprocket tooth part induction heat treatment process |
| CN101775476A (en) * | 2010-03-18 | 2010-07-14 | 上海纳铁福传动轴有限公司 | Intermediate-frequency heat treatment process of shaft parts |
| JP6409804B2 (en) * | 2016-03-18 | 2018-10-24 | トヨタ自動車株式会社 | Cam piece heat treatment method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06193708A (en) * | 1992-12-25 | 1994-07-15 | Nippon Piston Ring Co Ltd | Manufacture of cam shaft |
-
1996
- 1996-07-05 CN CN96109918A patent/CN1044387C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06193708A (en) * | 1992-12-25 | 1994-07-15 | Nippon Piston Ring Co Ltd | Manufacture of cam shaft |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101509062A (en) * | 2009-03-27 | 2009-08-19 | 中国第一汽车集团公司 | Method for quenching end socket ribbet position of assembled camshaft |
| CN101509062B (en) * | 2009-03-27 | 2013-03-06 | 中国第一汽车股份有限公司 | Method for quenching end socket ribbet position of assembled camshaft |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1148091A (en) | 1997-04-23 |
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