CN1030776C - Heat treating process and apparatus for disc saw - Google Patents
Heat treating process and apparatus for disc saw Download PDFInfo
- Publication number
- CN1030776C CN1030776C CN 92111856 CN92111856A CN1030776C CN 1030776 C CN1030776 C CN 1030776C CN 92111856 CN92111856 CN 92111856 CN 92111856 A CN92111856 A CN 92111856A CN 1030776 C CN1030776 C CN 1030776C
- Authority
- CN
- China
- Prior art keywords
- sawtooth
- saw
- quenching
- disc saw
- hardness
- 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
Abstract
The present invention relates to a heat treatment method and device of a large-size hot rolling disk saw. A saw tooth of a disk saw is heated by a flame spraying gun to an austenitizing temperature, and is poked to the atomizing area of an atomization spraying gun to be quenched in a spraying mode; the quenched saw tooth automatically leaves the quenching area to carry out automatic tempering treatment, and a next saw tooth carries out the same operation of heat treatment until all of the saw teeth of the disk saw are treated. The treated saw teeth are reinforced by electric sparks. The hardness of the saw teeth processed in this way, can be about HRC70. The internal structure is refined, the hardness is uniform, the toughness is good, and the service life can be prolonged by 5 to 8 times. The method and the device have the advantages of simplicity, practicality, low cost and obvious economic benefit, and can be widely used for the metallurgy enterprise.
Description
The invention belongs to the thermal treatment process and the device of disc saw sawtooth.
Both at home and abroad to the thermal treatment of disc saw, adopt high-frequency induction quenching usually at present, electrically contact methods such as heating quenching and flame heating quenching.Disc saw after heat treatment, the hardness of its sawtooth generally can reach about RC60.
The U.S. Pat of announcing on July 13rd, 1,971 3592703, name are called " heat treating method of disc saw and production technique " to be introduced, this method treatment unit be used to harden sawing hot-rolled profile disc saw sawtooth and tooth root.During the disc saw rotation, sawtooth crown and tooth root are heated to austenitizing temperature by the fixed induction heating device, then carry out shrend with stationary device.The shield cap that is used to saw can prevent that saw blade from reheating and preventing the softening of initial hot spots when entering heating unit again.This treatment process can prevent that the root of sawtooth from producing fatigue cracking.Compare with common heat treating method, the method and apparatus that this invention provides, in the sclerosis circular saw blade, increased the fatigue resistance of disc saw, the sclerosis scope can expand tooth root to, and can eliminate the distortion of saw blade, but the shortcoming of this invention is, the induction heating device investment is high, and the equipment cage is big, take than large space, be difficult for using at the scene.
The U.S. Pat 3923561 that on December 2nd, 1975 announced, name is called: " heat treating method of band saw " introduced, and in this heat treating method, the blade of sawtooth surfaced, and the rest part of sawtooth is immersed in the water, and the blade after the heating is immediately by water quenching.The advantage of this method is to have avoided hardening of whole sawtooth, thereby has guaranteed the toughness of whole sawtooth, is difficult for collapsing tooth in the use.During processing, the sawtooth blade is crown 1～2mm by flame or induction heating and the rest part and the saw body of sawtooth are immersed in quenchant or the refrigerant, and for example in water or the oil, hot spots is by water or oil, or carries out jet quenching by other quenchant.Hardened steel is the T8 tool steel.The hardness of handling the back sawtooth can reach Rc61～62, and after 170～200 ℃ of tempering, HRC is 57～58.The U.S. Pat 4030951 that on June 21st, 1977 announced, name is called " enhancement method of sawtooth " and introduces, the enhancement method of this invention is that mobile water contacts with airborne sawtooth crown, and under this state, flame is blown into the sawtooth crown, blow the flowing water that surrounds on the sawtooth crown thus off, and heat only makes the sawtooth crown be in quenching temperature, mobile then sawtooth, away from the flame heating district, cool off sawtooth with flowing water flow simultaneously.Utilize this method need be with complicated quenching device. each sawtooth crown of band saw is quenched uniformly.But above-mentioned binomial technology has two shortcomings, and one need to install tank, and large-scale disc saw is difficult for installing tank at the scene.The 2nd, water logging and flowing water quenching quality are inhomogeneous, and this is that Hardness Distribution is inhomogeneous because of structure refinement degree inequality, therefore in use, broken teeth often takes place.
1976.11.2 the United States Patent (USP) U5388995 that announces, name is called " coating steel work and production technique " to be introduced, and this method is used for the reinforcement of band saw sawtooth crown, and crown is with the carbide coating of titanium carbide or refractory metal.This coating or compound are to be sprayed on the surface of crown by the plasma spray method.Before the spraying,, remove dirt impurity on the crown with ion then,, react with carbonaceous chemical substance or with other carbonization materials by titanium or refractory metal and to form strengthened coat then with titanium or refractory metal ion bombardment crown earlier with crown blade sharpening profit.Meanwhile, the crown that scribbles this coating is passed to magnetic flux, strengthen so that crown is implemented pulse.In addition, also available other metallic carbide, boride, nitride and metallide applies.Said process all carries out in vacuum chamber, and vacuum tightness is 4.2 * 10
-5Holder.But this square law device, plasma spray equipment, operation, management are all complicated, and main be that coating and matrix bond are not firm, easily peel off, can't be used for the reinforcement of disc saw at all.
Purpose of the present invention is exactly for heat treating method that overcomes above-mentioned various hacksaws and device, or shortcomings such as equipment complexity or quality shakiness, a kind of scene that is suitable for is provided, to thermal treatment and the surface intensified technique and the device of large-scale disc saw, the i.e. thermal treatment process of flame heating, fog quenching and device.Adopt this technology and device that the hardness of circular saw blade is reached about HRC70, improved the work-ing life of disc saw significantly.
Technology of the present invention and device are seen accompanying drawing 1, accompanying drawing 2, accompanying drawing 3.Accompanying drawing 1 is thermal treatment process and device synoptic diagram, and accompanying drawing 2 is the atomizing lance synoptic diagram, and accompanying drawing 3 is the electrospark impregnation process schematic representation.
The Technology for Heating Processing of this invention is to realize like this, by flame gun 1 disc saw sawtooth 4 is heated to austenitizing temperature, the sawtooth 4 of heating is forwarded to the position of atomizing lance 2 by automatic poking gear mechanism 3, control valve 8, pass into compressed air by inner sleeve, compressed-air actuated pressure is 0.4～0.5MPa. Control valve 9 passes into water by outer tube, and water is water at atmospheric pressure, and after mixing in rifle, carries out fog quenching by nozzle 5 ejection high-pressure atomization water. Sawtooth after the quenching is walked to leave the range of atomization and is carried out voluntarily tempering by 3 groups of automatic poking gear mechanisms, and next sawtooth has arrived on the position of atomizing lance 2 after the flame gun heating, carry out again above-mentioned quenching and drawing process, until whole circular saw blade quenches and the finishing of drawing process. The time that the automatic poking gear mechanism is whenever stirred a sawtooth is 1～3 second, and Best Times is 2 seconds. The distance of the spray nozzle front end of atomizing lance 2 and sawtooth 4 is 30～40mm, and optimum distance is 35mm. 1 of flame gun heating sawtooth end three/part is austenitizing temperature. Through this quenching and temper, sawtooth end 1/3 hardness can reach about HRC60. Disc saw after fog quenching carries out an electrospark impregnation again to be processed, and is about to Hardmetal materials YG8 (Wc, 92% of conduction; Co, 8%) apply infiltration to the sawtooth blade, to improve sawtooth hardness. Electrospark impregnation carries out in air. During reinforcement, electrode 12 connects the positive pole of capacitor 14, sawtooth 4 connects the negative pole of capacitor 14, electrode 12 is driven by oscillator 11, and cycle contact serrated surface, carry out pulsed discharge in sawtooth 4 ends that are reinforced, make carbide alloy electrode 12 be melted in the upper and formation hardened layer 13 in sawtooth 4 surfaces at once, serrated surface hardness can reach HRC70. 10 power supplys for the electrospark impregnation processing in the accompanying drawing 3.
In order to realize thermal treatment process of the present invention, ad hocly counted a kind of atomizing lance, see accompanying drawing 2.Atomizing lance 2 is by outer tube 6, inner sleeve 7, and nozzle 5, variable valve 8 and 9 is formed.Inner sleeve 7 can feed pressurized air, and outer tube 6 feeds water, and variable valve 8 can be regulated the inner sleeve air supply, and variable valve 9 can be regulated outer tube and feed the water yield.Wherein the diameter of nozzle 5 is 2～4mm, and optimum diameter is 3mm, and the diameter of outer tube 6 is 9～12mm, and optimum diameter is 10mm, and the diameter of inner sleeve 7 is 4～6mm, and optimum diameter is 5mm.
Advantage of the present invention and effect are as follows, because the present invention takes to carry out fog quenching by atomizing lance, sawtooth after the quenching leaves the range of atomization and carries out auto-tempering, compare with dip quench with flowing water, because fog quenching cooling rate height, cooling is even, and high concentration heats with fog quenching and almost finishes simultaneously at the blade of tooth, no water vapor bubbles is trapped on the crown, no quenching soft spots can carry out auto-tempering again after leaving the range of atomization, so the quench-hardened case structure refinement, the hardness height, and evenly, good toughness, it is wear-resisting not collapse tooth.After this, handle through electrospark impregnation, owing to carry out impulsive discharge between workpiece and the electrode, contact area is little, and contact resistance is big, and discharging current produces high temperature, the Wimet electrode is melted at once and forms hardened layer.Such hardened layer is the hardness height not only, and firm with matrix bond, has good red hardness, can keep its hardness constant under 750 ℃ of high temperature.This is an additive method, and is incomparable as methods such as plasma spray, ion nitriding, plating metallic cementation and physical chemistry vapour depositions.And present device is simple, and technology is easy to grasp, and investment is saved, and floor space is little, is suitable for execute-in-place.
Because flame heating fog quenching of the present invention and electrospark impregnation are handled, can obtain the strengthening layer of high-quality hardened layer and high rigidity.Commerical test shows that disc saw can improve 4～5 times work-ing life behind this complex intensifying, reaches as high as 8 times, and test-results sees Table 1:(table 1 and sees the literary composition back)
Flame heating fog quenching reinforcement method of electric spark of the present invention and device began to test in the medium-sized factory of Anshan iron and steel plant from nineteen ninety.The disc saw material that this factory uses is the 65Mn steel, and its diameter is φ 1600mm.This saw at high temperature, at a high speed, work under the high impact loads, the condition harshness, saw blade often because of broken teeth, collapse tooth, cognate lost efficacy.When sawing low alloy steel low temperature plastic, the life-span is lower, and it is frequent to change the sheet number of times, and a class reached tens times in eight hours sometimes, and saw blade work-ing life is 40 minutes to 1 hour.The saw blade that uses the inventive method and device to produce, under same working conditions, saw blade can reach 5 hours work-ing life, and the life-span is improved 4～5 times of average out tos, reaches as high as 8 times.This has not only saved a large amount of saw blades, and main is to have saved pull-down time, has increased operating rate of rolling mill, according to statistics, can give every year this factory's wound benefit more than 1,000,000 yuan.Alleviated labor strength simultaneously.
The present invention both can be used for hot disc saw, also can be used for cold disc saw.From nineteen ninety in Anshan iron and steel plant first sheet-steel rolling mill with useless saw blade 3000 multi-discs of this method test reparation, the saw blade after repairing can be by every sawing 6～7 tondals to 15 tons of every sawings, every price is 400 yuan, creates a benefit like this year and can reach 120～2,000,000 yuan.
Adopt flame heating fog quenching of the present invention and reinforcement method of electric spark and device to handle disc saw, its structure refinement, hardness are even, strengthening layer and matrix bond are firm, can make disc saw improve 5～8 times work-ing life, have tangible economic benefit, this invention can be widely used in the smelter.
Table 1 electrospark impregnation saw blade test-results
| The sawing section bar | Saw blade work-ing life (h) | Improve the life-span (multiple) | |
| The flame heating shrend is not strengthened | Flame heating fog quenching+reinforcement | ||
| 7.0 automobile rim | ???0.6～1 | ????5.5 | ?????4～7 |
| 7.0 automobile rim | ???0.6～1 | ????4.5 | ?????5～8 |
| The 15kg wheel track | ??????3 | ???12.8 | ?????4.2 |
| 6.5 automobile rim | ???0.6～1 | ????3.3 | ?????3～5 |
| 6.5 automobile rim | ???0.6～1 | ????6.0 | ????6～10 |
| 5.5 automobile rim | ???0.6～1 | ????5.0 | ?????5～8 |
| 6.5 automobile rim | ???0.6～1 | ????5.0 | ?????8～5 |
| 7.0 automobile rim | ???0.6～1 | ????5.5 | ?????9～5.5 |
Claims (4)
1. the thermal treatment process of a disc saw, it is characterized in that by flame spray gun (1), disc saw sawtooth (4) is heated to austenitizing temperature, the sawtooth (4) of heating is transformed into the position of atomizing lance (2) by automatic moving tooth mechanism (3), variable valve (8) feeds pressurized air by inner sleeve (7), variable valve (9) feeds water by outer tube (6), after in spray gun, mixing, carry out fog quenching by nozzle (5) ejection high speed atomized water, sawtooth after the quenching is dialled to walk to leave the range of atomization and carry out tempering voluntarily by automatic moving tooth mechanism (3), and next sawtooth has arrived the position of atomizing lance mouth after heating, carry out above-mentioned quenching and drawing process again, finish until whole circular saw blade quenching and drawing process, the back sawtooth hardness of quenching can reach HRC60; After fog quenching, disc saw carries out an electrospark impregnation again to be handled, with Hardmetal materials YG8 (WC, 92% of conduction; Co, 8%) applies infiltration to the sawtooth blade, to improve sawtooth hardness, electrospark impregnation carries out in air, during reinforcement, electrode (12) connects the positive pole of electric capacity (14), sawtooth (4) connects electric capacity (14) negative pole, electrode (12) is driven by vibrator (11), and cycle contact serrated surface, carry out impulsive discharge in workpiece sawtooth (4) end that is reinforced, make Wimet electrode (12) fusing at once and form hardened layer (13) on sawtooth (4) surface, serrated surface hardness can reach HRC70, and wherein (10) are the power supply of electrospark impregnation processing.
2. the thermal treatment process of a kind of disc saw as claimed in claim 1 is characterized in that the part that flame spray gun (1) only heats first three branch of sawtooth crown (4) is austenitizing temperature, automatically moving tooth mechanism (3) whenever to stir the time of a sawtooth be 1～3 second; Nozzle (5) front end of atomizing lance (2) and the distance of sawtooth (4) are 30～40mm, and the pressurized air air pressure that internal diameter sleeve pipe (7) feeds is 0.4～0.5MPa, and the feeding water of external diameter sleeve pipe (6) is water at atmospheric pressure.
3. the thermal treatment unit of the disc saw of a steel, it is made up of flame spray gun (1), automatic moving tooth mechanism (3) and electrospark impregnation mechanism, it is characterized in that this device also has an atomizing lance (2), spray gun (2) is made of outer tube (6), inner sleeve (7), nozzle (5) and variable valve (8), (9), inner sleeve (7) feeds pressurized air, outer tube (6) feeds water, and variable valve (8) can be regulated the inner sleeve air supply, and variable valve (9) can be regulated outer tube and feed water.
4. the thermal treatment unit of the described a kind of disc saw of claim 3 is characterized in that the diameter of the nozzle (5) of atomizing lance (2) is 2～4mm, and the diameter of outer tube (6) is 9～12mm, and the diameter of inner sleeve (7) is 4～6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92111856 CN1030776C (en) | 1992-10-31 | 1992-10-31 | Heat treating process and apparatus for disc saw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92111856 CN1030776C (en) | 1992-10-31 | 1992-10-31 | Heat treating process and apparatus for disc saw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1086547A CN1086547A (en) | 1994-05-11 |
| CN1030776C true CN1030776C (en) | 1996-01-24 |
Family
ID=4945559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92111856 Expired - Fee Related CN1030776C (en) | 1992-10-31 | 1992-10-31 | Heat treating process and apparatus for disc saw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1030776C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104284939A (en) * | 2012-05-09 | 2015-01-14 | 沙特基础创新塑料Ip私人有限责任公司 | Rubber composition, method for its formation, and automotive tire containing the composition |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103290181B (en) * | 2013-06-26 | 2015-04-22 | 天津市天瑞硬化工程有限公司 | Supersonic gas (fog) scanning quenching nozzle |
| CN106435147B (en) * | 2016-08-26 | 2018-01-09 | 日照海恩锯业有限公司 | A kind of saw blade air hardening method |
| SE542356C2 (en) * | 2017-04-21 | 2020-04-14 | Husqvarna Ab | Cutting blade and method for producing a cutting blade |
| CN108977636B (en) * | 2017-06-01 | 2024-01-26 | 鞍山翔龙制冷设备配件有限公司 | Piezoelectric spark quenching device |
-
1992
- 1992-10-31 CN CN 92111856 patent/CN1030776C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104284939A (en) * | 2012-05-09 | 2015-01-14 | 沙特基础创新塑料Ip私人有限责任公司 | Rubber composition, method for its formation, and automotive tire containing the composition |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1086547A (en) | 1994-05-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2175050B1 (en) | Nozzle for cold spray, and cold spray device using the nozzle for cold spray | |
| KR101016594B1 (en) | Hot forging equipment | |
| CN101519778A (en) | Laser cladding method for strengthening surface of piercing point | |
| CN106756742B (en) | A kind of electric spark deposition method for metal roller surface peening coating | |
| CN1030776C (en) | Heat treating process and apparatus for disc saw | |
| CN102634733A (en) | Composite roll having uniform roll surface hardness and made of high-speed steel containing boron and method for manufacturing composite roll | |
| CN108842126B (en) | Metal ceramic coating continuous casting crystallizer copper pipe and preparation method thereof | |
| CN104611664B (en) | Shaped steel planishing roll pass surface alloy supersonic spray coating intensifying method and sprayed on material | |
| CN111286584A (en) | System and method for laser nitriding metal surfaces | |
| SU1674689A3 (en) | Roller steel treatment method | |
| CN103643196A (en) | Making method of alloy coat coated prestressed steel wire | |
| US4036670A (en) | Tool steel | |
| CN104372204A (en) | Rare earth element coating for high-strength supports and treatment process thereof | |
| CN117187517A (en) | High-pressure valve production heat treatment method and equipment | |
| CN111270194B (en) | Heat treatment method for oil nozzle of marine diesel engine | |
| CN108642233A (en) | A method of improving the converter oxygen gun service life | |
| CN108396114A (en) | The rotating spraying quenching technical of high-chromium abrasion-proof cast iron part | |
| CN108624798B (en) | High-wear-resistance rolling mill guide lining plate | |
| CN110777241A (en) | Railway wheel cooling device, cooling method and preparation method | |
| CN105522253A (en) | Device for realizing nitrogen increment on surface of steel by pre-laying nitride through nitrogen arc in-situ metallurgy | |
| CN105441853A (en) | Two-stage compound surface reinforcing method | |
| CN103233112A (en) | Quenching and tempering heat treatment equipment and method for 4-6mm high-strength sheet | |
| CN103046058A (en) | Method for realizing nitriding or carburizing by thermal airflow jetting heating and shot blasting | |
| CN113021194B (en) | Method for preparing zinc-aluminum-magnesium alloy coated steel plate | |
| CN104227363A (en) | Turning tool production steps favorable for martensite formation during heat treatment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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 |