CN108085465A - A kind of laser heat treatment method for the upper die of bending machine tool that bending strip flattens - Google Patents
A kind of laser heat treatment method for the upper die of bending machine tool that bending strip flattens Download PDFInfo
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- CN108085465A CN108085465A CN201711391585.4A CN201711391585A CN108085465A CN 108085465 A CN108085465 A CN 108085465A CN 201711391585 A CN201711391585 A CN 201711391585A CN 108085465 A CN108085465 A CN 108085465A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/32—Radiation-absorbing paints
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
The invention discloses a kind of laser heat treatment methods for the upper die of bending machine tool that bending strip flattens.This method includes step in detail below：Step S101, after carrying out oil removing, derusting, cleaning, drying to processing surface, in the preset light-absorbing coating in surface：Step S102, the V-type mould point surface of mold is heat-treated using laser.The present invention on V-type mould point by coating new light-absorbing coating and technique, improve absorptivity of the V-type mould point to laser of mold, so as to formed on V-type mould point surface fine uniform, layer depth it is controllable, containing there are many be situated between it is steady mutually and the high-quality surface strengthening layer of intermetallic compound, wearability is heat-treated well 0.7 0.8mm of depth, it is small that the V-type mould point straightness of mold deforms the deformation of the 0.01 0.02mm edges of a knife, hardness is high, about 60HRC, milling after removing quenching from and quenching, the step of reducing existing process, it is more efficient, it is at low cost.
Description
Technical field
The invention belongs to mold production technical field, the upper die of bending machine flattened more specifically to a kind of bending strip
The laser heat treatment method of tool.
Background technology
Present requirement of the people to bender product is various, the increase of demand, in the case where technology is constantly brought forth new ideas, production
The update of product is rapider, and rich choice of products is colorful.The development of bender is not only towards the hair of high-end, H.D numerical control
Exhibition also develops to simple, cheap numerical control bender, so as to meet the needs of at all levels.
Bender is divided into manual bending machine, hydraulic bending press and numerical control bender.Manual bending machine is divided into as mechanical, hand-driven
Bender and electric and hand bender.Hydraulic bending press can be divided into again by the method for synchronization：Torsion axis is synchronous, machine liquid is synchronous and electro-hydraulic same
Step；Hydraulic bending press can be divided into again by motion mode：Upper dynamic, lower-moving type.Hydraulic bending press can be used for the various metals of bending
Outside plate, if operator mix various different structures, shape mold can also by metallic plate pressure, be converted into it is various of different shapes
Workpiece when being equipped with corresponding equipment, is also used for punching.According to the various form of bending, section configuration can provide very
Multiple use；Hydraulic bending press can also carry out bending using particular manufacturing craft, reach the bending requirement of special shape.
Pressing die is a kind of very common mold of electrical apparatus industry again for bending, as shown in Figure 1, including mold and lower die
Tool, the lower end of mold are V-type mould point, and the V-type mould point of mold moves down the recessed of mold under insertion under the drive of motor
In slot, the bending of workpiece is completed.The V-type mould point of mold contacts for a long time with workpiece, and therefore, the point requirement of V-type mould has higher
Hardness, improve its wearability, technique can briefly be divided into three classes：The first kind changes mold textura epidermoidea by phase transformation, obtains
Obtain high rigidity, such as flame hardening, induction heat treatment, laser heat treatment；Second class uses plating or coating side in die surface
Method obtains high rigidity, it is characterized in that high surface hardness layer is mainly obtained by physical method, such as plating Cr, brush plating, PVD sink
Product, CVD deposition etc.；Three classes change the chemical composition on mold surface layer and composition phase using the method for diffusion, reach and improve surface
The purpose of hardness, such as carburizing, nitriding, boronising, metallic cementation.
In conclusion the mold performance that the laser heat treatment in the first kind obtains is more excellent, use is relatively broad, but pin
To the specific processing method of mold, through retrieval, patent document 1：Chinese patent CN200410010847.4 discloses a kind of mould
Has cutting edge laser quenching hardening process, specific step is as follows：A, by a certain knife face level of pending cutting edge upward
It is placed in platen plane；B, uniformly applied away from cutting edge 10-15mm and the scope parallel with cutting edge in surface to be treated
Upper laser heat treatment light absorption paint；C, laser beam foucing is adjusted in surface to be treated, makes beam center away from the vertical of cutting edge
Distance is 2.6-3.7mm；D, laser beam scans heating, laser power along the direction parallel with cutting edge in pending plane：
1200-1800W, laser scanning speed：25-35mm/s, the hardened-depth at cutting edge are more than 2.5mm, and hardening bandwidth is more than
0.6mm, hardenability band hardness HRC ＞ 64.For another example patent document 2：Chinese patent CN201510694512.7 discloses a kind of bending
Die surface Laser hardening method, includes the following steps：Bending Mould surface layer is carried out at laser quenching by laser beam
Reason；Bending Mould skin temperature is monitored, stops laser beam irradiation after temperature reaches required hardness phase point temperature；Pass through
Bending Mould internal layer cryogenic material quick conductive is quickly cooled down Bending Mould skin temperature, obtains laser quenching hard formation.For another example
Patent document 3：Chinese patent CN201510070799.6 discloses a kind of laser shock method of extrusion die key position, step
It is rapid as follows：Extrusion die is quenched first, tempering heat treatment；Stress is heated and rubs during by working extrusion die
The analysis of abrasion obtains the extrusion die key position that extrusion die easily cracks source and wear out failure easily occurs；
Laser-impact is carried out by the position of key position and contour shape selection laser-impact parameter and impact path；Laser-impact is completed
Afterwards, key position surface size variable quantity is measured；New key position size is designed by size changing amount；To new extrusion die
Key position laser-impact again, finally obtains target extrusion die.
It is not difficult to find that above-mentioned patent can realize the laser heat treatment to mold, the bending flattened for bending strip
The V-type mould point of machine mold, the angle of wedge angle is 20-30 °, and the length of wedge angle is 10-15cm, in laser heat treatment process
In, V-type mould point is arranged in parallel with laser so that laser center is directed at the pointed tip of V-type mold, and the width of laser is controlled to come in fact
The width of existing V-type mold laser heat treatment, but since the material of mold is relatively low at high temperature to laser absorption rate, kilowatt
Under the conditions of laser equipment, hardened layer is too shallow, it is difficult to control suitable laser reinforcing gradient structure, the V that upper die of bending machine is caused to have
Pattern point hardness is not high, and abrasion is very fast, and service life is short, can not meet the scheduled overhaul of production；In addition, replace frequency height, mould
The input cost of tool is big.
The content of the invention
1. it to solve the problems, such as
It is relatively low at high temperature to laser absorption rate for the material of existing mold, under the conditions of kilowatt laser equipment, firmly
It is too shallow to change layer, it is difficult to control suitable laser reinforcing gradient structure, cause the V-type mould point hardness that upper die of bending machine has not high, mill
Damage the problem of very fast, the object of the present invention is to provide a kind of bending strip flatten upper die of bending machine tool laser heat treatment method,
By coating new light-absorbing coating on V-type mould point, absorptivity of the mold to laser is improved, so as in V-type mould point surface shape
Into fine uniform, layer depth it is controllable, containing there are many be situated between it is steady mutually and the high-quality surface strengthening layer of intermetallic compound, hardness is high, resistance to
Mill property is good.
2. technical solution
To solve the above-mentioned problems, the technical solution adopted in the present invention is as follows：
The laser heat treatment method for the upper die of bending machine tool that a kind of bending strip of the present invention flattens, including walking in detail below
Suddenly：
Step S101, processing surface is carried out oil removing, derusting, cleaning, it is dry after, in the preset light-absorbing coating in surface,
In its light-absorbing coating percentage by weight be made of following components：SiO2：25-30%, dispersant：3-5%, water paint：2-
3%th, anti-flash rusting agent：0.2-0.3%, industrial alcohol：40-50%, starch：1-3%, metal oxide：8-15%：
Step S102, the V-type mould point surface of mold is heat-treated using laser, the laser power 8000 of use~
8100 watts, laser head rises or drops to apart from die surface vertical direction 150-170mm, spot diameter 15-25mm, laser beam
According to certain sweep speed surface is made to reach Material Melt temperature, the defocusing amount of post-laser heat treatment is 150-170mm.
In a kind of possible embodiment of the present invention, the component of the mold is by weight percentage：C：0.40
~0.43%, Mn：3.18~4.22%, Cr：5.12~7.99%, Co：0.60~0.70%, Ni：≤ 0.030%, Si：0.20
~0.30%, S：≤ 0.035%, P：≤ 0.035%, its surplus is Fe, contains a small amount of carbon in the component of the mold, avoids
The V-type mould point surface oxidation of mold at high operating temperatures reduces carbon and aoxidizes to form CO/CO2Escaping gases are waited, so as to
Effectively eliminate the spilehole on the V-type mould point surface of mold.
In a kind of possible embodiment of the present invention, the water paint is water-base epoxy hydridization acrylic resin, pure
The third acrylic resin of silicon, waterborne organic silicon grafted propylene acid resin or acrylic resin modified one or more of combinations.Water
Property coating have good mobility so that light-absorbing coating of the invention can uniformly be coated in V-type mould point surface, and laser can
With in the uniform cumulative in V-type mould point surface, so as to reach the uniformity of V-type mould point surface laser quenching, guarantee formed fine uniform,
The controllable hardened layer of layer depth.
In a kind of possible embodiment of the present invention, the anti-flash rusting agent is organic chelate ZT-709 or anti-flash rusting agent
CH07A, water paint are coated in the V-type mould point surface of mold, can prevent V-type mould point surface that cathodization reaction occurs, and prevent
The ionization of iron, so as to which V-type mould point surface be avoided to be aoxidized by the oxygen in air.
In a kind of possible embodiment of the present invention, the dispersant is the group of wetting dispersing agent T90 and calcium stearate
Object is closed, wherein mass ratio is：Wetting dispersing agent T90：1-2%, calcium stearate：2-3%.
In a kind of possible embodiment of the present invention, the metal oxide is TiO2Or MgO or VO2, and must have
VO2, metal oxide serves not only as skeleton, while nano-VO2 crystal tool is less than 68 there are two types of different cell configurations in temperature
DEG C when, rutile structure is distorted, and symmetry is reduced to monocline (P21/c), originally be located at structure cell body-centered V4+Ion occurs
It is mobile, fold-line-shaped V-V chains are formed, reversible variation occurs for transmissivity, and transmissivity is high；When temperature is higher than 68 DEG C, it belongs to four
The rutile-type (P42/mnm) of prismatic crystal, O2-Ion forms regular octahedron, by V4+Bag is in octahedral interstices center, transmissivity drop
Low, high temperature heat can not be scattered and disappeared with heat radiation, ensure the aggregation of laser energy.
In a kind of possible embodiment of the present invention, the manufacture craft of the light-absorbing coating is as follows：By weight percentage by
Following components is made：SiO2：25%th, wetting dispersing agent T90：2%th, calcium stearate：3%th, water paint：3%th, organic chelate
The anti-flash rusting agent CH07A of ZT-709/：0.3%th, industrial alcohol：50%th, starch：3%th, TiO2/MgO：10.7%th, VO2：3%, successively
Add in the anti-flash rusting agent CH07A of industrial alcohol, wetting dispersing agent T90, water paint, organic chelate ZT-709/ of group component simultaneously
It stirs evenly, is then slowly added to SiO while stirring2, starch, calcium stearate, TiO2/MgO、VO2, after powder adds at a high speed
Scattered 30min, opens nano-level grinder, carries out circular grinding, and milling time is 10~13h, obtains median 50nm's
Nanometer light-absorbing coating.
In a kind of possible embodiment of the present invention, the laser beam flying speed V=(Mnwt+Crwt+Cowt+Niwt)/
Cwt(the constituent mass percentage of mold), unit mm/s under the laser beam flying speed, can control the V-type of mold
The thermal stress release of mould point, avoids generating hair check, while improves the hardness of the V-type mould point of mold, has preferable wearability
Energy.
3. advantageous effect
Compared with the prior art, beneficial effects of the present invention are：
(1) laser heat treatment method for the upper die of bending machine tool that bending strip of the invention flattens, changes existing milling
Quenching treatment is needed after brill, mold notch deflection is big, about 2-3mm, needs to use import Tool in Milling mold again after quenching
Then the edge of a knife refines again, processing step is numerous and diverse, and edge of a knife hardness is relatively low, about 40-45HRC；The present invention on V-type mould point by applying
New light-absorbing coating and technique are covered, improves absorptivity of the V-type mould point to laser of mold, so as in V-type mould point surface shape
Into fine uniform, layer depth it is controllable, containing there are many be situated between it is steady mutually and the high-quality surface strengthening layer of intermetallic compound, wearability are good hot
Depth 0.7-0.8mm is handled, the V-type mould point straightness deformation 0.01-0.02mm edge of a knife deformations of mold are small, and hardness is high, about
60HRC, it is more efficient the step of removing milling after quenching and quenching from, reduce existing process, it is at low cost；
(2) laser heat treatment method for the upper die of bending machine tool that bending strip of the invention flattens is added in light-absorbing coating
There is starch, since starch granules uniformly disperses, under starch lubricating action, metal oxide TiO2Or MgO or VO2Disperse more
To be uniform, the stability of light-absorbing coating is good, convenient for storing for a long time；In addition starch is organic matter, in subsequent laser quenching
It in process, all volatilizees, noresidue in the upper die of bending machine tool surface flattened in bending strip does not have any shadow to the performance of product
It rings；
(3) laser heat treatment method for the upper die of bending machine tool that bending strip of the invention flattens, the component of mold is by weight
Measuring percentages is：C：0.40~0.43%, Mn：3.18~4.22%, Cr：5.12~7.99%, Co：0.60~0.70%,
Ni：≤ 0.030%, Si：0.20~0.30%, S：≤ 0.035%, P：≤ 0.035%, its surplus be Fe, the group of the mold
Containing a small amount of carbon in point, the V-type mould point surface oxidation of mold at high operating temperatures is avoided, carbon is reduced and aoxidizes to be formed
CO/CO2Escaping gases are waited, so as to effectively eliminate the spilehole on the V-type mould point surface of mold；
(4) laser heat treatment method for the upper die of bending machine tool that bending strip of the invention flattens, water paint has fine
Mobility so that light-absorbing coating of the invention can uniformly be coated in V-type mould point surface, and laser can be in V-type mould point table
The uniform cumulative in face so as to reach the uniformity of V-type mould point surface laser quenching, ensures to be formed controllable hard of fine uniform, layer depth
Change layer；
(5) laser heat treatment method for the upper die of bending machine tool that bending strip of the invention flattens, anti-flash rusting agent are organic chelate
Object ZT-709 or anti-flash rusting agent CH07A are closed, water paint is coated in the V-type mould point surface of mold, can prevent V-type mould point surface
The cathodization reaction of generation, prevents the ionization of iron, so as to which V-type mould point surface be avoided to be aoxidized by the oxygen in air；
(6) laser heat treatment method for the upper die of bending machine tool that bending strip of the invention flattens, metal oxide are not only made
For skeleton, while nanometer VO2Crystal tool is there are two types of different cell configurations, and when temperature is less than 68 DEG C, rutile structure occurs
Distortion, symmetry are reduced to monocline (P21/c), are originally located at the V of structure cell body-centered4+Ion moves, and forms fold-line-shaped V-V
Reversible variation occurs for chain, transmissivity, and transmissivity is high；When temperature is higher than 68 DEG C, it belongs to the rutile-type (P42/ of tetragonal
Mnm), O2-Ion forms regular octahedron, by V4+It wraps at octahedral interstices center, decrease in transmission, high temperature heat can not be with hot spoke
It penetrates lost, ensures the aggregation of laser energy；
(7) laser heat treatment method for the upper die of bending machine tool that bending strip of the invention flattens, laser beam flying speed V=
(Mnwt+Crwt+Cowt+Niwt)/Cwt(the constituent mass percentage of mold), unit mm/s, in the laser beam flying speed
Under, the thermal stress release of the V-type mould point of mold can be controlled, avoids generating hair check, while improves the hard of the V-type mould point of mold
Degree has preferable wear-resisting property.
Description of the drawings
Technical scheme is described in further detail below with reference to drawings and examples, but should
To know, these attached drawings only design for task of explanation, therefore not as the restriction of the scope of the invention.In addition, except non-specifically
It points out, these attached drawings are meant only to conceptually illustrate structure construction described herein, without to be drawn to scale.
Fig. 1 is the structure diagram for the upper die of bending machine tool that the bending strip of the present invention flattens；
Fig. 2 is the laser heat treatment structure diagram of the present invention.
Specific embodiment
Hereafter to the detailed description of exemplary embodiment of the present invention with reference to attached drawing, which forms one of description
Point, in the figure the enforceable exemplary embodiment of the present invention is shown as example.Although these exemplary embodiment quilts
Fully describe in detail so that those skilled in the art can implement the present invention, it is to be understood that can realize other embodiment and
Can without departing from the spirit and scope of the present invention to the present invention various changes can be made.Hereafter to the embodiment of the present invention
More detailed description is not limited to required the scope of the present invention, and just to be illustrated and do not limit pair
The description of the features of the present invention and feature to propose to perform the best mode of the present invention, and is sufficient so that those skilled in the art
It can implement the present invention.Therefore, the scope of the invention is only defined by the appended claims.
Hereafter detailed description of the present invention and example embodiment can be more fully understood with reference to attached drawing, wherein the present invention
Element and feature are identified by reference numeral.
Embodiment 1
Referring to Fig.1 and 2, the structure diagram for the upper die of bending machine tool that the bending strip that Fig. 1 is the present invention flattens, bending
V-type mould point with the upper die of bending machine tool flattened, the angle of wedge angle is 20-30 °, and the length of wedge angle is 10-15cm；Fig. 2 is
The laser heat treatment structure diagram of the present invention.
The group of the laser heat treatment method, wherein mold of the upper die of bending machine tool that a kind of bending strip of the present embodiment flattens
Divide and be by weight percentage：C：0.40%th, Mn：3.18%th, Cr：5.12%th, Co：0.60%th, Ni：0.030%th, Si：
0.20%th, S：0.035%th, P：0.035%th, its surplus is Fe, including step in detail below：
Step S101, processing surface is carried out oil removing, derusting, cleaning, it is dry after, in the preset light-absorbing coating in surface,
In its light-absorbing coating percentage by weight be made of following components：SiO2：25%th, wetting dispersing agent T90：2%th, calcium stearate：
3%th, water-base epoxy hydridization acrylic resin：3%th, organic chelate ZT-709：0.3%th, industrial alcohol：50%th, starch：3%th,
TiO2：10.7%th, VO2：3%：
The manufacture craft of wherein light-absorbing coating is as follows：Sequentially add the industrial alcohol, wetting dispersing agent T90, water of group component
Property epoxy hybrid acrylic resin, organic chelate ZT-709 are simultaneously stirred evenly, and are then slowly added to SiO while stirring2, form sediment
Powder, calcium stearate, TiO2/MgO、VO2, the high speed dispersion 30min after powder adds, open nano-level grinder, carry out cycle grind
Mill, milling time 10h obtain nanometer light-absorbing coating of the median in 50nm；
Step S102, the V-type mould point surface of mold is heat-treated using laser, the laser power 8000 of use
Watt, laser head is risen or dropped to apart from die surface vertical direction 150mm, spot diameter 15mm, and laser beam is according to centainly sweeping
Retouching speed makes surface reach Material Melt temperature, and the defocusing amount of post-laser heat treatment is 150mm, laser beam flying speed V=
(Mnwt+Crwt+Cowt+Niwt)/Cwt(the constituent mass percentage of mold)=(3.18+5.12+0.6+0.03)/0.4=
22.32mm/s。
It is well known that not pretreated metal surface not only causes the strong reflection of laser beam most of preciousness
The loss of laser energy, and serious threat the health of operating personnel.Therefore, when carrying out Laser Surface Treatment,
Surface must be pre-processed, to improve material to laser absorption rate.If coating routine " melanism " coating in laser treatment,
Due to relatively low under laser treatment high temperature to laser absorption rate, under the conditions of kilowatt laser equipment, hardened layer is too shallow, it is difficult to control
Suitable laser reinforcing gradient structure.
But the phosphatization and the melanism method of coating carbon black or graphite generally used for many years is such as absorbed there are a series of problems
Rate is relatively low, and thermal stability is poor, declines with temperature rise absorptivity, removes difficulty, there is pollution.Therefore develop and have to laser
There is high-absorbility, thermal stability is good, pollution-free, the good new pattern laser surface treatment absorbing coating of cost performance.
In addition, although laser heat treatment carries out under nitrogen protection, partial oxidation still has occurred in material surface,
Carbon aoxidizes to form CO/CO2Escaping gases are waited, gas escapes from surface, some spileholes are formd on surface, are more had very
Person, during laser heat treatment, the surface of workpiece is present with crackle, and the formation of crackle is mainly due to laser heat treatment
Quick heating and melt surface object being quickly cooled down in process of setting so that material surface generates very high temperature ladder
Degree, causes the generation of thermal stress, once thermal stress is more than the elastic limit of material surface, it will cause the germinating of face crack with
Extension.Once face crack is formed, under the action of the high thermal stress in surface, crackle into material matrix stress level compared with
Low position extends, 60~80 μm below crack propagation to surface.
What deserves to be explained is inventor is by largely testing and analyzing, first, be prepared for the nano-oxide of the present invention
Absorbing coating, higher to the absorptivity of laser, laser accordingly strengthens gradient structure and provides enough state spaces in order to control,
Rational ladder is presented up to 0.8mm in the laser hardening layer depth on the V-type mould point surface for the upper die of bending machine tool that bending strip flattens
Degree distribution microscopic structure, wearability is preferable, is tested through 10000 durable analog vibrations, almost without abrasion, in contrast frequent
The V-type mould point for the upper die of bending machine tool that the bending strip of rule heat treatment flattens has generated excessive abrasion even existing rupture.
Embodiment 2
The group of the laser heat treatment method, wherein mold of the upper die of bending machine tool that a kind of bending strip of the present embodiment flattens
Divide and be by weight percentage：C：0.43%th, Mn：4.22%th, Cr：5.4%th, Co：0.70%th, Ni：0.02%th, Si：0.20%th,
S：0.03%th, P：0.03%th, its surplus is Fe, including step in detail below：
Step S101, processing surface is carried out oil removing, derusting, cleaning, it is dry after, in the preset light-absorbing coating in surface,
In its light-absorbing coating percentage by weight be made of following components：SiO2：30%th, wetting dispersing agent T90：1%th, calcium stearate：
2%th, the third acrylic resin of pure silicon：3%th, anti-flash rusting agent CH07A：0.2%th, industrial alcohol：46%th, starch：2.8%th, MgO：
8%th, VO2：7%；
The manufacture craft of wherein light-absorbing coating is as follows：Percentage is made of following components by weight：Sequentially add group component
Industrial alcohol, wetting dispersing agent T90, the third acrylic resin of pure silicon, anti-flash rusting agent CH07A are simultaneously stirred evenly, then while stirring
It is slowly added to SiO2, starch, calcium stearate, MgO, VO2, the high speed dispersion 30min after powder adds, unlatching nano-level grinder, into
Row circular grinding, milling time 13h obtain nanometer light-absorbing coating of the median in 50nm；
Step S102, the V-type mould point surface of mold is heat-treated using laser, the laser power 8100 of use
Watt, laser head is risen or dropped to apart from die surface vertical direction 160mm, spot diameter 20mm, and laser beam is according to centainly sweeping
Retouching speed makes surface reach Material Melt temperature, and the defocusing amount of post-laser heat treatment is 160mm, laser beam flying speed V=
(Mnwt+Crwt+Cowt+Niwt)/Cwt(the constituent mass percentage of mold)=(4.22+5.4+0.7+0.02)/0.43=
24.05mm/s。
Through measurement, the laser hardening layer depth on the V-type mould point surface of the upper die of bending machine tool of the bending strip pressing of the present embodiment
Up to 0.75mm, and rational gradient distribution microscopic structure is presented, wearability is preferable, is tried through 10000 durable analog vibrations
It tests, almost without abrasion, the V-type mould point of the upper die of bending machine tool of the pressing of the bending strip through normative heat treatment in contrast has generated
Excessive abrasion even existing rupture.
Embodiment 3
The group of the laser heat treatment method, wherein mold of the upper die of bending machine tool that a kind of bending strip of the present embodiment flattens
Divide and be by weight percentage：C：0.42%th, Mn：3.98%th, Cr：6.99%th, Co：0.65%th, Ni：0.03%th, Si：0.2%th,
S：0.02%th, P：0.02%th, its surplus is Fe, including step in detail below：
Step S101, processing surface is carried out oil removing, derusting, cleaning, it is dry after, in the preset light-absorbing coating in surface,
In its light-absorbing coating percentage by weight be made of following components：SiO2：28%th, wetting dispersing agent T90：2%th, calcium stearate：
2%th, waterborne organic silicon grafted propylene acid resin：3%th, organic chelate ZT-709：0.2%th, industrial alcohol：47%th, starch：
3%th, TiO2：7.8%th, VO2：6.9%；
The manufacture craft of wherein light-absorbing coating is as follows：Percentage is made of following components by weight：Sequentially add group component
Industrial alcohol, wetting dispersing agent T90, waterborne organic silicon grafted propylene acid resin, organic chelate ZT-709 are simultaneously stirred evenly, so
It is slowly added to SiO while stirring afterwards2, starch, calcium stearate, TiO2、VO2, after powder adds high speed dispersion 30min, unlatching receive
Rice grinder, carries out circular grinding, and milling time 12h obtains nanometer light-absorbing coating of the median in 50nm；
Step S102, the V-type mould point surface of mold is heat-treated using laser, 800 watts of the laser power of use,
Laser head rises or drops to apart from die surface vertical direction 160mm, spot diameter 20mm, and laser beam is according to certain scanning speed
Degree makes surface reach Material Melt temperature, and the defocusing amount of post-laser heat treatment is 160mm, laser beam flying speed V=(Mnwt+
Crwt+Cowt+Niwt)/Cwt(the constituent mass percentage of mold)=(3.98+6.99+0.65+0.03)/0.42=
27.74mm/s。
Through measurement, the laser hardening layer depth on the V-type mould point surface of the upper die of bending machine tool of the bending strip pressing of the present embodiment
Up to 0.78mm, and rational gradient distribution microscopic structure is presented, wearability is preferable, is tried through 10000 durable analog vibrations
It tests, almost without abrasion, the V-type mould point of the upper die of bending machine tool of the pressing of the bending strip through normative heat treatment in contrast has generated
Excessive abrasion even existing rupture.
Schematically the present invention and embodiments thereof are described above, this describes no restricted, institute in attached drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited thereto.So if common skill of this field
Art personnel are enlightened by it, without departing from the spirit of the invention, are not inventively designed and the technical solution
Similar frame mode and embodiment, are within the scope of protection of the invention.
Claims (8)
1. the laser heat treatment method for the upper die of bending machine tool that a kind of bending strip flattens, which is characterized in that including walking in detail below
Suddenly：
Step S101, processing surface is carried out oil removing, derusting, cleaning, it is dry after, in the preset light-absorbing coating in surface, wherein its
Light-absorbing coating percentage by weight is made of following components：SiO2：25-30%, dispersant：3-5%, water paint：2-3%, resist
Flash rusting agent：0.2-0.3%, industrial alcohol：40-50%, starch：1-3%, metal oxide：8-15%：
Step S102, the V-type mould point surface of mold is heat-treated using laser, the laser power 8000~8100 of use
Watt, laser head is risen or dropped to apart from die surface vertical direction 150-170mm, spot diameter 15-25mm, laser beam according to
Certain sweep speed makes surface reach Material Melt temperature, and the defocusing amount of post-laser heat treatment is 150-170mm.
2. the laser heat treatment method for the upper die of bending machine tool that bending strip according to claim 1 flattens, which is characterized in that
The component of the mold is by weight percentage：C：0.40~0.43%, Mn：3.18~4.22%, Cr：5.12~
7.99%th, Co：0.60~0.70%, Ni：≤ 0.030%, Si：0.20~0.30%, S：≤ 0.035%, P：≤ 0.035%,
Its surplus is Fe.
3. the laser heat treatment method for the upper die of bending machine tool that bending strip according to claim 2 flattens, which is characterized in that
The water paint is water-base epoxy hydridization acrylic resin, the third acrylic resin of pure silicon, waterborne organic silicon grafted propylene acid tree
Fat or acrylic resin modified one or more of combinations.
4. the laser heat treatment method for the upper die of bending machine tool that bending strip according to claim 3 flattens, which is characterized in that
The anti-flash rusting agent is organic chelate ZT-709 or anti-flash rusting agent CH07A.
5. the laser heat treatment method for the upper die of bending machine tool that bending strip according to claim 4 flattens, which is characterized in that
The dispersant is wetting dispersing agent T90 and the composition of calcium stearate, and wherein mass ratio is：Wetting dispersing agent T90：1-2%,
Calcium stearate：2-3%.
6. the laser heat treatment method for the upper die of bending machine tool that bending strip according to claim 5 flattens, which is characterized in that
The metal oxide is TiO2Or MgO or VO2, and must have VO2。
7. the laser heat treatment method for the upper die of bending machine tool that bending strip according to claim 6 flattens, which is characterized in that
The manufacture craft of the light-absorbing coating is as follows：Percentage is made of following components by weight：SiO2：25%th, wetting dispersing agent T90：
2%th, calcium stearate：3%th, water paint：3%th, the anti-flash rusting agent CH07A of organic chelate ZT-709/：0.3%th, industrial alcohol：
50%th, starch：3%th, TiO2/MgO：10.7%th, VO2：3%：Sequentially add the industrial alcohol of group component, wetting dispersing agent T90,
The anti-flash rusting agent CH07A of water paint, organic chelate ZT-709/ is simultaneously stirred evenly, and is then slowly added to SiO while stirring2, form sediment
Powder, calcium stearate, TiO2/MgO、VO2, the high speed dispersion 30min after powder adds, open nano-level grinder, carry out cycle grind
Mill, milling time are 10~13h, obtain nanometer light-absorbing coating of the median in 50nm.
8. the laser heat treatment method for the upper die of bending machine tool that bending strip according to any one of claims 1 to 7 flattens,
It is characterized in that, the laser beam flying speed V=(Mnwt+Crwt+Cowt+Niwt)/Cwt, unit mm/s.
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| KR20170065050A (en) * | 2015-12-02 | 2017-06-13 | 주식회사 포스코 | Coating composition for excellent anti-corrosion and anti-finger, stainless steel having etching pattern, and method of manufacturing the stainless steel |
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Application publication date: 20180529 |