CN101368257A - Die surface fast diffusion metalizing treatment technique - Google Patents
Die surface fast diffusion metalizing treatment technique Download PDFInfo
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- CN101368257A CN101368257A CNA2008101210321A CN200810121032A CN101368257A CN 101368257 A CN101368257 A CN 101368257A CN A2008101210321 A CNA2008101210321 A CN A2008101210321A CN 200810121032 A CN200810121032 A CN 200810121032A CN 101368257 A CN101368257 A CN 101368257A
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Abstract
The invention relates to a fast metal seeping processing technique on a die surface, namely that a pre-heat die is arranged in a metal seeping slat furnace; a pulse circulating heating mode is adopted to preserve heat; thermal fluctuation is utilized to increase the kinetic energy of a metal atom so as to improve the transferring speed of the atom and quicken the transferring speed of a seeped atom in the metal so as to achieve the goal of reinforced treatment on the die; the pulse circulating heating mode includes an equiamplitude pulse technique and a step pulse technique and overcomes the defects of long heating time and high temperature of the traditional processing technique, thereby obtaining remarkable developments and obvious effects on the aspects like shortening the technique processing time, reducing the technique temperature, the environment pollution and the energy waste, improving the quality of a seeping layer, and the like.
Description
Technical field
The present invention relates to the intensive treatment on a kind of metal die surface, especially a kind of die surface fast diffusion metalizing treatment technique.
Background technology
The height of die life is one of important indicator of weighing die quality, and it not only influences quality product, and influences production efficiency and cost.Therefore, the intensive treatment of die surface is subject to people's attention day by day, and except traditional iron and steel thermal treatment, process for treating surface has become an emerging important subject that grows up.TD (Thermal Diffision Carbide Coating Process) coating treatment technology (fused salt soaks the edge method) is the abbreviation that the thermal diffusion method carbide coating is handled, also claim the technical finesse of TD molten salt diffusion metallizing,, be that a kind of effective solution mould is pulled problem and can significantly be improved the process for treating surface of die life at first by the invention of institute of central authorities of Japanese Toyota.Its principle is that mould is placed extraordinary medium, by 900～1000 ℃, 3～10 hours High temperature diffusion effect of insulation, form extremely tens of microns metallic carbide coating of a number of plies micron at die surface, this coating has hardness height (HV can reach about 3200), fine and close smooth, with the matrix metallurgical binding, have high wear-resisting, bite-resistant, performance such as anti-corrosion, compare with physical vapor deposition (PVD), chemical vapor deposition (CVD), it is simple to have equipment, advantages such as cost of investment is low, and is easy to operate are extremely paid attention to.
Find in process of production: though plasma surface alloying process has improved the hardness of die surface, also have deficiency, 1., cause mould toughness to descend because mould through the soak of long-time (3～10 hours), causes material grains thick; 2. because the moulding stock quenching temperature can be up to 1100～1150 ℃, metal-salt can cause volatilization to pollute under the condition of high temperature; 3. fused salt influences quality layer with the raising oxidation aggravation of infiltration temperature; 4. heat wastes energy for a long time.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, propose a kind of kinetic energy that utilizes heat fluctuation to increase atoms metal, be ultimate principle with the travelling speed that improves atom, employing pulse cycle type of heating quickens to infiltrate a kind of die surface fast diffusion metalizing treatment technique of atom in intrametallic travelling speed, shortening process treatment time, reduction technological temperature, minimizing environmental pollution thereby reach.
According to the foregoing invention purpose, the present invention is achieved through the following technical solutions: a kind of die surface fast diffusion metalizing treatment technique, it is characterized in that described technology is constant amplitude pulse technology, and this technology may further comprise the steps:
1. will melt at metallic cementation salt stove internal heating by the metal-salt of implantation technique configuration, and fused salt is carried out purifying treatment, be warming up to 900 ± 10 ℃;
2. mould preheating in 750～850 ℃ middle thermohaline stove, soaking time 20～30 minutes;
3. hang insulation in 900 ± 10 ℃ of metallic cementation salt stoves rapidly through the mould of preheating, soaking time is determined according to die size and salt stove heating coefficient:
t1＝A·k·D
In the formula-and t1---the mold heated time, divide
A---heating coefficient was got 0.3～0.35 minute/millimeter
K---mould shove charge coefficient gets 1.5 usually
D---mould net thickness
Require soaking time to be no less than 20 minutes;
4. the insulation back is warmed up to 1000 ± 10 ℃ with stove, is incubated 5～15 minutes;
5. high temperature section insulation back cools to 900 ± 10 ℃ with stove, is incubated 20～30 minutes;
6. according to the material and the requirement of the coating degree of depth of die design, be provided with a plurality ofly repeat successively 4., 5. constant amplitude pulse circular treatment cycle, wherein the last circulation in last cycle is warmed up to the quenching solid solubility temperature of die design, this temperature is incubated 5～20 minutes by handling low 20～50 ℃ of settings of material hot treatment quenching temperature.
Described a plurality of constant amplitude pulse circular treatment cycle is 3～10.
A kind of die surface fast diffusion metalizing treatment technique is characterized in that described technology is step pulse technology, and this technology may further comprise the steps:
1. will melt at metallic cementation salt stove internal heating by the metal-salt of implantation technique configuration, and fused salt is carried out purifying treatment, be warming up to 900 ± 10 ℃;
2. mould preheating in 750～850 ℃ middle thermohaline stove, soaking time 20～30 minutes;
3. hang insulation in 900 ± 10 ℃ of metallic cementation salt stoves rapidly through the mould of preheating, soaking time is determined according to die size and salt stove heating coefficient:
t1＝A·k·D
In the formula-and t1---the mold heated time, divide
A---heating coefficient was got 0.3～0.35 minute/millimeter
K---mould shove charge coefficient gets 1.5 usually
D---mould net thickness
Require soaking time to be no less than 20 minutes;
4. the insulation back is warmed up to 1000 ± 10 ℃ with stove, is incubated 5～15 minutes;
5. cool to 920 ± 10 ℃ with stove, be incubated 20～30 minutes;
6. be warmed up to 1020 ± 10 ℃ with stove, be incubated 5～15 minutes;
7. according to the material and the requirement of the coating degree of depth of die design, be provided with a plurality ofly repeat successively 5., 6. step pulse circular treatment cycle, each loop cycle temperature relatively last time improved 20～30 ℃, wherein the last circulation in last cycle is warmed up to the quenching solid solubility temperature of die design, this temperature is incubated 5～20 minutes by handling low 20～50 ℃ of settings of material hot treatment quenching temperature.
Described a plurality of step pulse circular treatment cycle is 3～5.
Total metallic cementation heat tracing time t2 of described constant amplitude pulse and step pulse is according to mould coating depth calculation: total metallic cementation heat tracing time press t2 〉=hour/3～5 microns.
Compared with prior art, the present invention utilizes heat fluctuation to increase the kinetic energy of atoms metal, is ultimate principle to improve the travelling speed of infiltrating atom in metal, two kinds of processing methodes of constant amplitude pulse and step pulse have been adopted, realize the metal die surface Hardening Treatment, overcome the defective that conventional processes heat-up time is long, temperature is high, thereby obtained shortening process treatment time, reduce technological temperature, reduce environmental pollution, improve quality layer, reducing marked improvement and the positive effect of aspects such as energy dissipation.
Embodiment
A kind of die surface fast diffusion metalizing treatment technique of the present invention, this technology comprise constant amplitude pulse technology and two kinds of type of heating of step pulse technology.
Two kinds of type of heating all relate to pre-configured fused salt, about fused salt composition and proportioning thereof, " thermal treatment handbook " the 3rd edition the 1st periodical of publishing according to China Machine Press carries content, fused salt preparation in advance in metallic cementation salt stove by weight percentage: comprise adding BaCl65%, NaCl10%, dewatering borax 10%, aluminium powder 5%, adding the needs of titanium or vanadium or chromium or niobium, add titanium-iron powder or vanadium iron powder or ferrochrome powder or ferro-niobium powder 10% by the metallic cementation composition;
The fused salt that is mixed with slagging-off back reached deoxidizing purification in calm 20 minutes, then to metallic cementation fused salt heat temperature raising to 900 ± 10 ℃;
For the soaking time of calculating according to die size and salt stove heating coefficient, as less than 20 minutes, must guarantee to be no less than 20 minutes, to grow to guarantee the low-temperature zone soaking time, so can not be less than 20 minutes.
In constant amplitude pulse or the step pulse, the total metallic cementation heat tracing of mould time t2 is according to the requirement of the die design coating degree of depth, press t2 〉=hour/3～5 microns calculating, do not comprise the warm preheating insulation time in the mould.The total distribution principle of metallic cementation heat tracing time t2 in each procedure is: heat tracing time high temperature period is short, and heat tracing time low temperature period is long.
Embodiment 1
Certain cold extrusion die adopts LD steel to make, and coating is handled the degree of depth 〉=10 micron.Original place science and engineering skill is: thermohaline stove preheating insulation is 25 minutes in 800 ℃, hangs 5 hours metallic cementations of 950 ℃ of high-temperature salt furnace insulations fast, is warmed up to 1100 ℃ of insulations oil quenchinng in 20 minutes.After three tempering of 550 ℃ of insulations, test, 13 microns of mould coating thicknesses, surface hardness HV2800, matrix hardness HRC60～61.5,8～8.5 grades of grain fineness numbers, it is 5 hours 20 minutes that total metallic cementation is handled soaking time t2.
Adopt step pulse heating process of the present invention: thermohaline stove preheating insulation is 25 minutes in 800 ℃, hang 900 ℃ of metallic cementation salt stove insulations 30 minutes fast, be warmed up to 1000 ℃ of insulations 15 minutes, be cooled to 930 ℃ of insulations 30 minutes, be warmed up to 1030 ℃ of insulations 15 minutes, be cooled to 960 ℃ of insulations 30 minutes, circulation for the third time is warmed up to 1080 ℃ of insulations oil quenchinng in 20 minutes.Total metallic cementation heat tracing time t2 is 3 hours 50 minutes.After 550 ℃ of three tempering, test the mould coating thickness〉15 microns, surface hardness HV2800, matrix hardness HRC61～62.5, grain fineness number〉9 grades.
Adopt the present invention, the process time has shortened 1 hour 35 minutes, and the mould coating increases by 2 microns, and grain fineness number improves 1 grade, and mould improves about 10% actual service life.
Embodiment 2
Certain cold-work die requires coating carbide to improve wear resisting property with Cr12MoV steel, the coating degree of depth 〉=15 micron.Original place science and engineering skill: thermohaline stove preheating insulation is 25 minutes in 750 ℃, hangs 1000 ℃ fast, 8 hours metallic cementations of high-temperature salt furnace insulation, and insulation back oil quenchinng, it is 8 hours that total metallic cementation is handled soaking time t2.After three tempering of 530 ℃ of insulations, test 13 microns of mould coating thicknesses, surface hardness HV3000, matrix hardness HRC61～62.5,7.5～8 grades of grain fineness numbers.
Adopt constant amplitude pulse heating process of the present invention: thermohaline stove preheating insulation is 25 minutes in 750 ℃, enter 900 ℃ of metallic cementation salt stove insulations 30 minutes fast, be warmed up to 1000 ℃ of insulations 15 minutes, be cooled to 900 ℃ of insulations 30 minutes, be warmed up to 1000 ℃ of insulations 15 minutes, be cooled to 900 ℃ of insulations 30 minutes, circulation for the third time heats to 1000 ℃ of insulations oil quenchinng in 20 minutes.Total metallic cementation heat tracing time t2 is 4 hours 20 minutes, tests the mould coating thickness after 530 ℃ of three tempering〉15 microns, matrix hardness HRC63～63.5, grain fineness number〉9 grades.
Embodiment 3
Make with the H13 steel certain poling top, is to improve the upper layer high-temperature behavior, on the surface by the boron compound layer of 100～130 microns of boronising formation.Former technology is: mould is hung in 750 ℃ thermohaline stove insulation 30 minutes, hangs 950 ℃ of salt stoves insulations of boronising 7 hours rapidly, is warmed up to 1050 ℃ of insulations oil quenchinng of coming out of the stove in 20 minutes.Dark 150 microns of infiltration layer, 6～7.5 grades of grain fineness numbers.
Adopt constant amplitude pulse heating process of the present invention; Mould is hung into the shove charge of boronising salt stove and is warmed up to 750 ℃ of insulations 30 minutes, hang 900 ℃ of boronising salt stove insulations 30 minutes rapidly, be warmed up to 1000 ℃ of insulations 15 minutes, cool to 900 ℃ of insulations 30 minutes, be warmed up to 1000 ℃ of insulations 15 minutes again, cool to 900 ℃ of insulations 30 minutes, repeat above working cycle totally 3 times, circulation for the third time is warmed up to 1030 ℃ of insulations oil quenchinng of coming out of the stove in 20 minutes.Total metallic cementation heat tracing time t2 is 4 hours 20 minutes.Dark 125 microns of infiltration layer, 8～8.5 grades of grain fineness numbers are saved 2 hours 40 minutes process time.
Claims (5)
1. a die surface fast diffusion metalizing treatment technique is characterized in that described technology is constant amplitude pulse technology, and this technology may further comprise the steps:
1. will melt at metallic cementation salt stove internal heating by the metal-salt of implantation technique configuration, and fused salt is carried out purifying treatment, be warming up to 900 ± 10 ℃;
2. mould preheating in 750～850 ℃ middle thermohaline stove, soaking time 20～30 minutes;
3. hang insulation in 900 ± 10 ℃ of metallic cementation salt stoves rapidly through the mould of preheating, soaking time is determined according to die size and salt stove heating coefficient:
t1＝A·k·D
In the formula-and t1---the mold heated time, divide
A---heating coefficient was got 0.3～0.35 minute/millimeter
K---mould shove charge coefficient gets 1.5 usually
D---mould net thickness
Require soaking time to be no less than 20 minutes;
4. the insulation back is warmed up to 1000 ± 10 ℃ with stove, is incubated 5～15 minutes;
5. high temperature section insulation back cools to 900 ± 10 ℃ with stove, is incubated 20～30 minutes;
6. according to the material and the requirement of the coating degree of depth of die design, be provided with a plurality ofly repeat successively 4., 5. constant amplitude pulse circular treatment cycle, wherein the last circulation in last cycle is warmed up to the quenching solid solubility temperature of die design, this temperature is incubated 5～20 minutes by handling low 20～50 ℃ of settings of material hot treatment quenching temperature.
2. a kind of die surface fast diffusion metalizing treatment technique according to claim 1 is characterized in that described a plurality of constant amplitude pulse circular treatment cycle is 3～10.
3. a die surface fast diffusion metalizing treatment technique is characterized in that described technology is step pulse technology, and this technology may further comprise the steps:
1. will melt at metallic cementation salt stove internal heating by the metal-salt of implantation technique configuration, and fused salt is carried out purifying treatment, be warming up to 900 ± 10 ℃;
2. mould preheating in 750～850 ℃ middle thermohaline stove, soaking time 20～30 minutes;
3. hang insulation in 900 ± 10 ℃ of metallic cementation salt stoves rapidly through the mould of preheating, soaking time is determined according to die size and salt stove heating coefficient:
t1＝A·k·D
In the formula-and t1---the mold heated time, divide
A---heating coefficient was got 0.3～0.35 minute/millimeter
K---mould shove charge coefficient gets 1.5 usually
D---mould net thickness
Require soaking time to be no less than 20 minutes;
4. the insulation back is warmed up to 1000 ± 10 ℃ with stove, is incubated 5～15 minutes;
5. cool to 920 ± 10 ℃ with stove, be incubated 20～30 minutes;
6. be warmed up to 1020 ± 10 ℃ with stove, be incubated 5～15 minutes;
7. according to the material and the requirement of the coating degree of depth of die design, be provided with a plurality ofly repeat successively 5., 6. step pulse circular treatment cycle, each loop cycle temperature relatively last time improved 20～30 ℃, wherein the last circulation in last cycle is warmed up to the quenching solid solubility temperature of die design, this temperature is incubated 5～20 minutes by handling low 20～50 ℃ of settings of material hot treatment quenching temperature.
4. a kind of die surface fast diffusion metalizing treatment technique according to claim 3 is characterized in that described a plurality of step pulse circular treatment cycle is 3～5.
5. according to claim 1 or 3 described a kind of die surface fast diffusion metalizing treatment techniques, the total metallic cementation heat tracing time t2 that it is characterized in that described constant amplitude pulse and step pulse is according to mould coating depth calculation: total metallic cementation heat tracing time press t2 〉=hour/3～5 microns.
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| CNA2008101210321A CN101368257A (en) | 2008-09-18 | 2008-09-18 | Die surface fast diffusion metalizing treatment technique |
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| CNA2008101210321A CN101368257A (en) | 2008-09-18 | 2008-09-18 | Die surface fast diffusion metalizing treatment technique |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102344998A (en) * | 2011-07-21 | 2012-02-08 | 南京迪威尔重型锻造股份有限公司 | Method for determining quenching soaking time of shaft parts |
| CN103184320A (en) * | 2013-04-11 | 2013-07-03 | 无锡西姆莱斯石油专用管制造有限公司 | Process for preparing high-grade steel by quenching and tempering 29CrMo44 steel |
| CN106148970A (en) * | 2015-04-16 | 2016-11-23 | 宁波金特信钢铁科技有限公司 | A kind of piercing plug for seamless steel tubes surface infiltration layer technique |
| CN108048790A (en) * | 2017-12-15 | 2018-05-18 | 佛山东燊金属制品有限公司 | A kind of die surface fast diffusion metalizing processing method |
| CN109355618A (en) * | 2018-12-12 | 2019-02-19 | 绵阳云飞精工机械有限公司 | The production line of alloy bushing |
-
2008
- 2008-09-18 CN CNA2008101210321A patent/CN101368257A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102344998A (en) * | 2011-07-21 | 2012-02-08 | 南京迪威尔重型锻造股份有限公司 | Method for determining quenching soaking time of shaft parts |
| CN102344998B (en) * | 2011-07-21 | 2012-10-31 | 南京迪威尔高端制造股份有限公司 | Method for determining quenching soaking time of shaft parts |
| CN103184320A (en) * | 2013-04-11 | 2013-07-03 | 无锡西姆莱斯石油专用管制造有限公司 | Process for preparing high-grade steel by quenching and tempering 29CrMo44 steel |
| CN106148970A (en) * | 2015-04-16 | 2016-11-23 | 宁波金特信钢铁科技有限公司 | A kind of piercing plug for seamless steel tubes surface infiltration layer technique |
| CN108048790A (en) * | 2017-12-15 | 2018-05-18 | 佛山东燊金属制品有限公司 | A kind of die surface fast diffusion metalizing processing method |
| CN109355618A (en) * | 2018-12-12 | 2019-02-19 | 绵阳云飞精工机械有限公司 | The production line of alloy bushing |
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Open date: 20090218 |