CN1020286C - Heat treatment of grinding ball - Google Patents
Heat treatment of grinding ball Download PDFInfo
- Publication number
- CN1020286C CN1020286C CN91108774A CN91108774A CN1020286C CN 1020286 C CN1020286 C CN 1020286C CN 91108774 A CN91108774 A CN 91108774A CN 91108774 A CN91108774 A CN 91108774A CN 1020286 C CN1020286 C CN 1020286C
- Authority
- CN
- China
- Prior art keywords
- ball
- abrading
- quenching
- heating
- grinding ball
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
The present invention provides a method for heating a grinding ball. The grinding ball is heated in an induction heat penetrating furnace with medium frequency, and then, a two-step quenching method that spray quenching is firstly carried out and then immersion quenching occurs is used. Water is used as a quenching medium, the grinding ball is tempered, time for heating the grinding ball is determined according to t1=aD<2>, and spray time is determined according to t2=bD<3>/1000. A hardening layer of the grinding ball treated with the method is deep, hardness distribution is uniform, and thereby, the durability of the grinding ball is greatly improved. The method is easy to realize the continuous operation of mechanical automation. Thereby, the treatment quality of the grinding ball is stable, workers' labor strength is decreased, and the present invention can be suitable for the heat treatment of various grinding balls.
Description
The present invention relates to a kind of heat treating method of abrading-ball.
Abrading-ball is the main consumable accessory in the grinding plant, in order to improve the work-ing life of abrading-ball, what people at first expected is to adopt heat treating method to carry out quenching strengthening, usually the technology that adopts is at present: the abrading-ball after will processing, heat continuously by the box-type furnace heating or by continuous tunnel furnace, quench tempered again finishing then through disposable the soaking of water.Results such as this heat treating method easily causes heating inhomogeneous (owing to being the heating of accumulation formula) different with the quench-hardened case depth, and Hardness Distribution is inhomogeneous.And use proof, and its life-span of abrading-ball after aforesaid method is handled under many situations is not as good as treated, and mainly being that hardness is uneven easily loses circle and scraps.
China's patent 85109476 " technology for forging and rolling steel ball of high wear resistence and low manganese content " is disclosed to be the deformation heat treatment method of abrading-ball, this method all is beneficial to for toughness energy-conservation and the raising abrading-ball, but in actual production, quenching temperature after the deformation is not easy stably to be controlled in the ideal range, so just easily makes the quenching quality of abrading-ball produce fluctuation; In addition, the quenching mode of this patent is the shrend when rolling downwards of the raceway of abrading-ball on cylindrical wall, than general immerseable shrend bigger quench cooling rate is arranged, the depth of hardening zone event is so useful for increasing, but increasing degree is limited, can not reach the requirement of abrading-ball depth of hardening zone, because the most of hardening capacity of material that the forged steel ball adopts are not very high, and the toughness that thermomechanical treatment improves is little to the actual needs contribution of this abrading-ball, because of the service condition of abrading-ball flexible is required not very big, general a
k〉=5J/cm
2Can reach requirement, the general heat treatment mode of this technical indicator all can reach.
Purpose of the present invention aims to provide and a kind ofly increases the quench-hardened case of abrading-ball and make the uniform heat treating method of its Hardness Distribution, thereby improves the durability of abrading-ball, adopts this processing method to be easy to also realize that mechanical automation works continuously.
Mentality of designing of the present invention is as follows: for quench-hardened case and the hardness that improves abrading-ball, at first should improve present method of cooling, suitably improve speed of cooling, the usual method cooling fluid that changes is used salt, buck or is adopted the spray cooling, the former one is to increase cost, the 2nd, though can the abrading-ball of heating in batches be cooled off simultaneously, but will stir in process of cooling is very difficult, and adopt the spray mode to be not suitable for very much present batch type of heating, if make a plurality of shower nozzles, uneconomical economically, also be difficult to carry out in the reality.If but can find a kind of new heating means, and can single fast continuous heating abrading-ball, be very good and adopt spray cooling (only needing 1 or several shower nozzle), experiment showed, that its effect of hardening is also satisfactory.
Induction heating is one of rapid heating method, but introduction and the utilization of the operation the reality from various data, this method generally is applicable to a class, sleeve class, gear part, and can be used for the still unmanned research of ball part heating, for this reason, the contriver has done a large amount of experiments, as the 40Gr forged steel ball of Φ 90 is adopted the heat transmitting furnace of medium-frequency induction heating and after spray quench is handled the testing method by accompanying drawing 1 get its Hardness Distribution such as table 1, and same steel ball is adopted the box-type furnace heating, through soak quench after its Hardness Distribution see Table 2.
Contrast table 1 adopts the abrading-ball hardness of induction heating, spray Cooling Quenching on average to bring up to 1.4 times with table 2 as can be known, and even, hardened depth.
Table 1: medium frequency induction hardening hardness test (HRC)
Apart from Edge Distance (unit: mm)
Sequence number
5 10 15 20 25 30
1 57 56 53 50 46 43
2 58 57 51 48 48 45
3 59 57 53 49 49 45
4 59 58 53 50 46 45
5 59 57 53 53 48 46
6 57 58 53 51 48 47
7 59 57 53 50 49 45
8 59 57 53 51 48 45
Average 58.4 57.1 52.8 49.8 47.8 45.1
Maximum deviation 222534
Table 2: box-type furnace heating quenching hardness test (HRC)
Apart from Edge Distance (unit: mm)
Sequence number
5 10 15 20 25 30
1 40 38 39 33 36 25
2 49 44 43 36 27 27
3 50 47 39 36 34 32
4 49 44 37 30 34 27
5 50 46 39 32 27 26
6 41 33 31 31 3 34
7 48 43 41 33 30 30
8 50 48 44 41 37 28
Average 46.3 42.9 39.1 34 32.1 28.6
Maximum deviation 10 15 13 11 10 9
Analyze abrading-ball and can following 3 points be arranged by induction diathermic furnace homogeneous heating reason:
Although 1. abrading-ball is unequal at the section radius of diathermic furnace axis direction, the radius-of-curvature on his surface is equal everywhere, has so just avoided sharp angle effect, is unlikely local superheating.
2. grinding ball material is a ferromagnetic substance, and ferromagnetic substance exists magnetic transformation point (Curie point), and therefore when induction heating, the rate of heating of part can not be a constant.When rigidly connecting galvanization, the surperficial rate of heating of part is very big, when the surface occurs surpassing the skim of magnetic transformation point temperature, the μ value of this thin layer reduces to 1 suddenly, make the current density of this layer descend, rate of heating slows down, and big rate of heating moves on to the one deck than the lining, this heating means are exactly so-called penetration type heating means, although surface action, proximity effect, dough nut effect is to influence different with workpiece surface with not waiting of induction wall gap, it just is the place of diameter of section minimum that but penetration type adds the big place of temperature gap, thereby may reach even heating.
3. because the depth of hardening zone that abrading-ball needs has surpassed the actual current penetration depth, therefore the temperature of heart portion also needs so just to need long heat-up time by the conduction-type heating, and this helps even heating, certainly must guarantee that the surface is not overheated, this can reach by adjusting power input.
Cooling Quenching still maintains and soaking the first two step method of cooling of afterwards soaking of spraying of the formation of quenching among the present invention, so that abrading-ball quickens in the speed of cooling in high-temperature phase-change district, and reduce in low-temperature martensitic transformation district cooling rate, to reduce quenching stress as much as possible, guarantee that simultaneously abrading-ball hardens, quenches dark.
In sum, concrete scheme of the present invention is: the heat-treatment quenching of abrading-ball is to adopt the heat transmitting furnace of medium-frequency induction heating, and Heating temperature is A
C1(for hypereutectoid steel) or A
C3(for hypoeutectoid steel) above 70-200 ℃; Finish through spraying earlier the two step method of cooling of afterwards soaking again.(tempering process that keeps postorder)
Through groping experiment repeatedly: abrading-ball of the present invention is pressed t heat-up time
1=aD
2Calculate and determine, wherein coefficient a=4-6.5s/cm
2, D is a ball radius.The abrading-ball spray time is pressed t
2=bD
3/ 1000 calculating are definite, wherein coefficient b=10-46s/cm
3, D is a ball radius.
According to the above-mentioned formula manipulation time, can guarantee higher quality, be again the most economical time.Experimental results show that: heat-up time is too short, to cause increasing internal-external temperature difference, perhaps cause the surface overheated, perhaps cause heart portion temperature not reach, influence the quenching quality, heat-up time is long, though be of value to the minimizing internal-external temperature difference, increase loss, influence productivity, can influence the quenching quality equally when serious, make grain coarsening.And spray time generally should be greater than 2 seconds, be lower than 2 seconds and do not play the two step method effect, be actually single stage method (certainly less than the abrading-ball of critical hardening diameter with single stage method also can), the spray time of quenching can not be oversize, otherwise follow-up immersion liquid cooling has lost effect, to cause the abrading-ball cracking when serious, but also influence productivity.
Heat treating method provided by the present invention can make the abrading-ball quench-hardened case deepen, and its hardness improves about 1.4 times, and Hardness Distribution is even, and improve work-ing life, and simultaneously, this processing method is easy to realize working continuously of mechanical automation.
Below in conjunction with accompanying drawing technology of the present invention is further elaborated:
Fig. 1 is a measuring point distribution plan of measuring abrading-ball hardness;
Fig. 2 is a process flow sheet of working continuously of the present invention;
Fig. 3 is the sectional view of medium-frequency induction furnace of the present invention.
Embodiment explanation: referring to Fig. 2, abrading-ball 10 in the feed bin 9 is rolled into the place ahead of transfer bar mechanism 1 along guide rail, the opening for feed limit of diathermic furnace 2, under the promotion of push rod 1, enter in the diathermic furnace 2, diathermic furnace 2 exit end are extruded an abrading-ball that has heated simultaneously, and it rolls into along guide rail sprays the chamber 3 of quenching, the former abrading-ball of just quenching in spray hood 7 times spray is extruded spray chamber make it fall into continuous cold trap 4 to soak and quench, the good abrading-ball of quenching in the continuous cold trap 4 is rolled in the tempering pond 5 at last; Water coolant can be recycled in the water reservoir 6 and recycles; Diathermic furnace 2 is by intermediate frequency power supply 8 power supplies, and the period of motion of push rod 1 is determined (mainly to consider spray time t according to thermal treatment process
2With t heat-up time
1).
Referring to Fig. 3, diathermic furnace 2 is by furnace lining 14, insulation layer 13, and inductor block 12 reaches cover plate 11 and 15 compositions up and down, and the internal diameter of its furnace lining 14 doubly is advisable by the 1.05-1.3 of ball radius D, and the length of diathermic furnace is then by t heat-up time
1Determine with the push rod cycle.
Specific examples 1 to the thermal treatment of Φ 90.40Cr abrading-ball, is heat-treated by above-mentioned technical process, and its main technologic parameters is:
1. 2. Heating temperature T=920 ℃ of transfer bar mechanism t=33s (suitable A
C3+ 140 ℃)
3. intermediate frequency power P=92KW 4. heat-up time t
1=490s
5. hydraulic pressure p=2kg/cm
26. spray time t
2=33s
Example 2: to diameter is that the capsule shape abrading-ball thermal treatment of φ 50 is heat-treated by above-mentioned technical process, and its main technologic parameters is:
①t＝13s ②T＝920℃ ③P＝95kw
④t
1＝200s ⑤p＝1kg/cm
2⑥t
2＝13s
Example 3: to 45
#The thermal treatment of φ 90 balls, its main technologic parameters is:
1. 2. T=900 ℃ of t=30s (suitable A
C3+ 125 ℃) 3. P=90kw
④t
1＝470s ⑤p＝2kg/cm
2⑥t
2＝30
Example 4: material GCr15, the heat treatment process parameter of diameter phi 30 abrading-balls is:
T=1.5s T=900 ℃ of (suitable A
C1+ 150 ℃) P=85kw
t
1＝70s t
2＝0
Because of GCr15 hardening capacity is good, the minor diameter abrading-ball can spray to quench directly to roll out through continuous cold trap and get final product.
Example 5: to material is that the heat treatment process parameter of φ 60 balls of T10 steel is:
T=9s T=860 ℃ of (suitable A
C1+ 130 ℃) P=85kw
p＝2kg/cm
2t
1＝205s t
2＝9s
Claims (1)
1, the heat treating method of abrading-ball includes quenching heating, cooling, tempering process, it is characterized in that: the quenching heating of abrading-ball is heated with heat transmitting furnace of medium-frequency induction, and Heating temperature is A
C1Or A
C3Above 70-200 ℃; Its quench cooled adopts to spray to quench earlier soaks the two stepped quenching method of cooling of quenching again; Wherein abrading-ball is pressed t the heat-up time in induction furnace
1=aD
2Calculate and determine, wherein coefficient a=4-6.5s/cm
2, D is a ball radius; The spray quench time after the abrading-ball heating is pressed t
2=bD
3/ 1000 calculating are definite, wherein coefficient b=10-46s/cm
3, D is a ball radius.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91108774A CN1020286C (en) | 1991-09-05 | 1991-09-05 | Heat treatment of grinding ball |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91108774A CN1020286C (en) | 1991-09-05 | 1991-09-05 | Heat treatment of grinding ball |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1058992A CN1058992A (en) | 1992-02-26 |
| CN1020286C true CN1020286C (en) | 1993-04-14 |
Family
ID=4909474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN91108774A Expired - Fee Related CN1020286C (en) | 1991-09-05 | 1991-09-05 | Heat treatment of grinding ball |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1020286C (en) |
-
1991
- 1991-09-05 CN CN91108774A patent/CN1020286C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1058992A (en) | 1992-02-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1100151C (en) | Method for heat-treating hollow cylindrical workpiece | |
| KR101016594B1 (en) | Hot forging equipment | |
| CN205347520U (en) | Long -pending suspension type heat treatment line of putting | |
| CN1840714A (en) | Method for making quench hardening layer of cold roll barrel | |
| CN1296497C (en) | Double temperature quenching and strong toughening treatment method for cold forging die | |
| CN106868267B (en) | A kind of D2Steel roll double frequency heat treatment quenching process and device | |
| KR100684590B1 (en) | Heat treatment manufacturing apparatus and its method | |
| CN101215680A (en) | Aluminum alloy die-casting die steel surface shot blasting strengthening treatment method | |
| US6364974B1 (en) | Quenching apparatus and method for hardening steel parts | |
| CN108130403A (en) | A kind of impewdance matching processing method of Cr12 rolls | |
| CN105714027A (en) | Heat treatment process for hardening and tempering of 45 steel | |
| CN101008044A (en) | Shield-shape induction device for cold roll integral induction heat and deep quenching | |
| CN1190617C (en) | Cylinder shape pipe piece with inner harden layer and production method and equipment | |
| CN1020286C (en) | Heat treatment of grinding ball | |
| CN110964894A (en) | Preparation process of external thread steel pipe for anchor rod | |
| CN1038435C (en) | High hardenability hot-rolling steel ball and heat treatment method | |
| JPS63274713A (en) | Heat treatment method for bar-like parts | |
| DE112004001920T5 (en) | Heat treatment system | |
| CN108424999B (en) | A kind of heat treatment process of shallow-tank separator driving chain components | |
| CN107988459B (en) | Method for strengthening guide rail of gray iron machine tool | |
| CN1068054A (en) | Produce the process of cement nail and nailing with mild steel | |
| CN1026996C (en) | Quenching method for metal card clothing | |
| JPH1161264A (en) | Crawler bush and its manufacture | |
| CN115232948B (en) | Steel cylindrical part horizontal shape cooperative regulation and control heat treatment method | |
| CN114317928B (en) | Heat treatment method for 18CrNiMo7-6 wind power gear steel material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |