CN101845539B - Method for strengthening edges of tool and die based on laser transformation hardening - Google Patents

Method for strengthening edges of tool and die based on laser transformation hardening Download PDF

Info

Publication number
CN101845539B
CN101845539B CN 201010180617 CN201010180617A CN101845539B CN 101845539 B CN101845539 B CN 101845539B CN 201010180617 CN201010180617 CN 201010180617 CN 201010180617 A CN201010180617 A CN 201010180617A CN 101845539 B CN101845539 B CN 101845539B
Authority
CN
China
Prior art keywords
tool
light source
mould
strengthening
distance
Prior art date
Application number
CN 201010180617
Other languages
Chinese (zh)
Other versions
CN101845539A (en
Inventor
骆芳
陈智军
胡夏夏
杨友东
姚建华
Original Assignee
浙江工业大学
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 浙江工业大学 filed Critical 浙江工业大学
Priority to CN 201010180617 priority Critical patent/CN101845539B/en
Publication of CN101845539A publication Critical patent/CN101845539A/en
Application granted granted Critical
Publication of CN101845539B publication Critical patent/CN101845539B/en

Links

Abstract

The invention relates to a method for strengthening edges of a tool and a die based on laser transformation hardening. The method comprises the following steps of: selecting a laser strengthening light source according to experience, and setting light source parameters, wherein the light source parameters comprise laser wavelength, power, scanning speed and spot diameter; obtaining the parameter of the tool and the die to be processed, wherein the tool and die parameters comprise material properties, transformation temperature, melting point and geometry size; setting a starting position of the strengthening light source, carrying out laser scanning, and fast cooling the tool and the die through compressed air so as to achieve the purpose of surface strengthening; and carrying out simulation calculation under the condition that the light source irradiates the tool and the die so as to obtain the optimal strengthening distance between the strengthening light source and the edges of the tool and the die, and enabling the distance between the starting position of the strengthening light source and the edges of the tool and the die to be equivalent to the optimal strengthening distance. The invention consumes less human and material resources, can not produce waste, can ensure the optimality of an offset distance, and especially has greater advantages on laser strengthening of a single product.

Description

Enhancement method based on the edges of tool and die of laser transformation hardening
Technical field
The present invention relates to a kind of laser surface intensified treatment process, particularly be directed to a kind of laser transformation hardening method of edges of tool and die.
Technical background
The main failure forms of tool and mould is surface abrasion.Therefore, utilize process for treating surface to improve the over-all propertieies such as intensity, hardness, antiwear characteristic on tool and mould surface, to reduce wear, improve tool and mould work-ing life, also just become most economical, effective means.At present, developed kinds of surface intensive treatment technology in tool and mould industry, common are: thermospray, plasma chemistry thermal treatment, ion implantation technique, gas phase deposition technology, TD processing, plating and electroless plating, Brush Plating etc.Along with the development of product mass-producing, the high speed that particularly occurs both at home and abroad constantly, efficiently reach the appearance of high precision plastic working technique, the over-all properties of tool and mould is required to become more and more harsher, the tool and mould life problems becomes increasingly conspicuous; Traditional surface strengthening treatment technology more and more is difficult to satisfy the needs of reality, so, utilize laser to process the sight line of also just having come into people to the tool and mould surface.Laser surface treating technology is to utilize the laser of high-energy-density to carry out surface treatment to tool and mould, thereby changes microstructure or the composition on tool and mould top layer, realizes surface strengthening or the reparation of tool and mould.
Laser transformation hardening (laser quenching) is to utilize laser irradiation to the metallic surface, make its surface reach transformation temperature rapidly and form austenite with very high heat-up rate, after laser beam leaves, utilize the thermal conduction of metal own and " certainly quenching " occurs, make the metallic surface that martensitic transformation occur.Compare with traditional quenching method, laser quenching is carried out in anxious heat, quenching process, and thermograde is high, thereby has formed the special hardening tissue of one deck extreme hardness on the surface, as grain refining, high dislocation density etc.The hardness of the hardness ratio normal quenching of its quenched case is also high by 15%~20%.Depth of hardening zone can reach 0.1~2.5mm, thereby can greatly improve the wear resistance of tool and mould, extends the work-ing life of tool and mould.After laser surface intensified, the cementation zone hardness of tool and mould is high, and wear resistance is good.But for tool and mould edge and boss, conventional treatment process is seek the just bias distance or adopt baffle plate near edge or boss by test of many times.
But the searching of just bias distance and non-once just can find, and the experiment that often needs to carry out for a long time, repeatedly counts just can be obtained, and cause and scrap the tool and mould enormous amount because of what experiment caused, and waste is large.And the accuracy of the offset or dish that this treatment process searches out is closely related with experimental implementation person's experience, can't guarantee that this offset or dish is optimum value.
If adopt baffle plate near edge or boss, prevent collapsing of the edges, both consumed human and material resources, can cause again baffle plate and tool and mould edge or protruding adhesion so that scrap.
Summary of the invention
Consumption for the man power and material that overcomes prior art, overcome the defectives such as the limit of collapsing at tool and mould edge (or projection), it is little that invention provides a kind of human and material resources to consume, and do not cause waste, can guarantee the reinforcing mould surface method based on laser transformation hardening of the optimality of offset or dish.
Enhancement method based on the edges of tool and die of laser transformation hardening comprises the following steps:
1), rule of thumb select the laser reinforcing light source, light source parameters is set, described light source parameters comprises optical maser wavelength, power, sweep velocity and spot diameter; Obtain the parameter of tool and mould to be processed, the tool and mould parameter comprises material properties, transformation temperature, fusing point and geometry size;
2) set to strengthen the zero position of light source, carry out laser scanning, and logical pressurized air with quick bosher's mould, reach the purpose of surface strengthening;
It is characterized in that: the situation of light source irradiation tool and mould is carried out simulation calculation, strengthened light source and strengthen distance with the best at tool and mould edge to obtain, make the zero position of strengthening light source and the distance at tool and mould edge equal described the best reinforcement distance;
Obtaining the best step of strengthening distance comprises:
(A) set up model according to the tool and mould parameter; Set to strengthen the starting position of light source, obtain the distance at light source and tool and mould edge;
(B) tool and mould in the hot spot irradiation area of strengthening light source is carried out the thermal field analysis, obtain the temperature field on tool and mould surface;
(C) obtain the temperature at tool and mould edge according to the distance at light source and tool and mould edge, transformation temperature and the fusing point of lip temperature and tool and mould compared:
(C.1) if lip temperature higher than fusing point, tool and mould is when accepting light source irradiation, the tool and mould edge can liquefy, and will strengthen light source and move an offset or dish towards the direction away from the tool and mould edge, re-executes step (B);
(C.2) if lip temperature lower than transformation temperature, the tool and mould edge can't undergo phase transition and can't reach enhancement purpose, will strengthen light source and move an offset or dish towards the direction near the tool and mould edge, re-executes step (B);
(C.3) if lip temperature higher than transformation temperature and lower than fusing point, obtains the current distance of strengthening light source and tool and mould edge, strengthen distance with this current distance as the best.
Further, step C) in, utilize finite element software to carry out emulation, obtain the temperature field of hot spot irradiation area by finite element thermal analysis, described offset or dish equals the grid number that the tool and mould size of the tool and mould size/scanning direction of scanning direction is divided.
Technical conceive of the present invention is: before actually operating, light source irradiation tool and mould surface is strengthened in simulation, obtains the temperature field on tool and mould surface by the thermal field analysis, obtains the best reinforcement distance of strengthening light source and tool and mould edge.When actually operating, light source is arranged at the optimum position, can guarantee that all products are salable product, can not cause waste, and use manpower and material resources sparingly.The size that the grid of scanning direction is divided is less, and it is more accurate that the best of acquisition is strengthened distance; But grid division size is little, and calculated amount is large, so should select suitable grid to divide size.
The human and material resources that the present invention consumes are little, do not cause waste, can guarantee the advantage of the optimality of offset or dish.
Description of drawings
Fig. 1 is schema of the present invention
Fig. 2 is the schematic diagram of the relative position of reinforcement light source and tool and mould
Fig. 3 is the schematic diagram of the geometric model of tool and mould
Fig. 4 is the schematic diagram that carries out the geometric model after grid is divided
Fig. 5 is for strengthening the analogous diagram of light source and tool and mould Edge Distance 0.5mm
Fig. 6 is for strengthening the actual figure of light source and tool and mould Edge Distance 0.5mm
Fig. 7 is for strengthening the analogous diagram of light source and tool and mould Edge Distance 1.0mm
Fig. 8 is for strengthening the analogous diagram of light source and tool and mould Edge Distance 1.5mm
Fig. 9 is for strengthening the actual figure of light source and tool and mould Edge Distance 1.5mm
Figure 10 is for strengthening the analogous diagram of light source and tool and mould Edge Distance 2.0mm
Embodiment
Embodiment one
With reference to Fig. 1
Enhancement method based on the edges of tool and die of laser transformation hardening comprises the following steps:
1), rule of thumb select the laser reinforcing light source, light source parameters is set, described light source parameters comprises optical maser wavelength, power, sweep velocity and spot diameter; Obtain the parameter of tool and mould to be processed, the tool and mould parameter comprises material properties, transformation temperature, fusing point and geometry size;
2) set to strengthen the zero position of light source, carry out laser scanning, and logical pressurized air with quick bosher's mould, reach the purpose of surface strengthening;
It is characterized in that: the situation of light source irradiation tool and mould is carried out simulation calculation, strengthened light source and strengthen distance with the best at tool and mould edge to obtain, make the zero position of strengthening light source and the distance at tool and mould edge equal described the best reinforcement distance;
Obtaining the best step of strengthening distance comprises:
(A) set up model according to the tool and mould parameter; Set to strengthen the starting position of light source, obtain the distance at light source and tool and mould edge;
(B) tool and mould in the hot spot irradiation area of strengthening light source is carried out the thermal field analysis, obtain the temperature field on tool and mould surface;
(C) obtain the temperature at tool and mould edge according to the distance at light source and tool and mould edge, transformation temperature and the fusing point of lip temperature and tool and mould compared:
(C.1) if lip temperature higher than fusing point, tool and mould is when accepting light source irradiation, the tool and mould edge can liquefy, and will strengthen light source and move an offset or dish towards the direction away from the tool and mould edge, re-executes step (B);
(C.2) if lip temperature lower than transformation temperature, the tool and mould edge can't undergo phase transition and can't reach enhancement purpose, will strengthen light source and move an offset or dish towards the direction near the tool and mould edge, re-executes step (B);
(C.3) if lip temperature higher than transformation temperature and lower than fusing point, obtains the current distance of strengthening light source and tool and mould edge, strengthen distance with this current distance as the best.
Step C) in, utilize finite element software to carry out emulation, obtain the temperature field of hot spot irradiation area by finite element thermal analysis, described offset or dish equals the grid number that the tool and mould size of the tool and mould size/scanning direction of scanning direction is divided.
Technical conceive of the present invention is: before actually operating, light source irradiation tool and mould surface is strengthened in simulation, obtains the temperature field on tool and mould surface by the thermal field analysis, obtains the best reinforcement distance of strengthening light source and tool and mould edge.When actually operating, light source is arranged at the optimum position, can guarantee that all products are salable product, can not cause waste, and use manpower and material resources sparingly.The size that the grid of scanning direction is divided is less, and the just bias distance of acquisition is more accurate; But size of mesh opening is little, and calculated amount is large, so should select suitable size of mesh opening.
Embodiment two
In conjunction with Fig. 2-10, and actual tests further illustrates the present invention:
Select the about 0.9kg of quality, P20 plastics mould steel, strengthening workpiece is of a size of 15mm * 10mm * 10mm, and its edge adopts the H13 alloy powder to strengthen.According to reinforcing process, adopt crossing current CO 2The required laser power P=1.5kW of laser apparatus, spot diameter D=4mm, synchronous powder feeding system.Concrete steps are as follows:
(1) simulation is adopted and actual identical technique-synchronous powder feeding system method, same matrix material plastics mould steel P20 surface cladding H13 powder, and laser technical parameters is as shown in table 1:
Table 1 laser technical parameters
Processing parameter
Laser scanning speed v (m/s) ??0.005
Laser power P (KW) ??1.5
Spot size D (mm) ??4
(2) select the Gauss heat source model approximate with the laser thermal source;
(3) select SOLID70 as the cell type of modeling
Suppose the cladding layer cross section for half-cylindrical, radius is 2mm, as shown in Figure 2, considers symmetry, gets 1/2 of workpiece and analyzes.Adopt SOLID70 to carry out map grids to cladding layer and divide, as shown in Figure 3.Consider the speed of computational accuracy and operation, matrix is divided into two-layer, one deck is of a size of the rectangular parallelepiped of 15mm * 8mm * 10mm, the rectangular parallelepiped of one deck 15mm * 10mm * 10mm, and wherein the rectangular parallelepiped of the 2mm * 10mm of 15mm * (10-8) is as the heat affected zone.Size of mesh opening adopts the SOLID90 transition element between up and down between the two;
(4) adopt the mode of synchronous powder feeding system cladding, thermal physical property parameter (thermal conductivity (W/m ℃), the density (kg/m of input coating and matrix associated materials differing temps 3), specific heat capacity (J/kg ℃), enthalpy (J/m 3));
(5) thermal source loads, because laser beam in laser cladding process is kept in motion, the macros that adopts ANSYS Parametric Design Language APDL to write has realized the motion of laser beam, is mainly to be engraved in different positions by it when different to provide corresponding thermal source defeated people.Consider Edgebiased problem, at first starting position is set as 0.What will will scan along the direction of laser scanning is divided into 30 sections apart from 15mm, and the mid point of each section as the thermal source center, is applied equally distributed laser thermal source, each moved further 0.5mm.In the process of finding the solution, the hypothesized model that circulates for the first time has unified initial temperature and final condition, in ensuing circulation, strengthens the light source offset or dish and gets 0.5mm, 1.0mm, 1.5mm, 2.0mm.At first remove the thermal source input of last time and apply thermal source in new position, and the temperature as a result that the last time is calculated is calculated, until whole loop ends successively as the starting condition of this circulation;
(5) aftertreatment, obtaining the initial bias distance is 0 o'clock, the temperature field during P=1500W;
(6) the H13 powder that send because of matrix surface is thinner, ignores its transformation temperature and fusing point, only considers the relevant parameters of matrix.According to relevant data, 1100 ℃ of P20 transformation temperatures; Fusing point is about 1500 ℃; The differences that present temperature field different from initial offset or dish, determine the just bias distance again;
(7) select the determined just bias distance of simulation, at the enterprising line operate of the body material of having chosen.Adopt the light source biasing heating both can accentuated edges and projection, can reduce again the generation of the limit phenomenon of collapsing.
The present invention also is applicable to the reinforcement to the tool and mould protruding part
The described content of this specification sheets embodiment is only enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as only limiting to the specific form that embodiment states, protection scope of the present invention also reaches conceives the equivalent technologies means that can expect according to the present invention in those skilled in the art.

Claims (1)

1. based on the enhancement method of the edges of tool and die of laser transformation hardening, comprise the following steps:
1), rule of thumb select the laser reinforcing light source, light source parameters is set, described light source parameters comprises optical maser wavelength, power, sweep velocity and spot diameter; Obtain the parameter of tool and mould to be processed, the tool and mould parameter comprises material properties, transformation temperature, fusing point and geometry size;
2) set to strengthen the zero position of light source, carry out laser scanning, and logical pressurized air with quick bosher's mould, reach the purpose of surface strengthening;
It is characterized in that: the situation of light source irradiation tool and mould is carried out simulation calculation, strengthened light source and strengthen distance with the best at tool and mould edge to obtain, make the zero position of strengthening light source and the distance at tool and mould edge equal described the best reinforcement distance;
Obtaining the best step of strengthening distance comprises:
(A) set up model according to the tool and mould parameter; Set to strengthen the starting position of light source, obtain the distance at light source and tool and mould edge;
(B) tool and mould in the hot spot irradiation area of strengthening light source is carried out the thermal field analysis, obtain the temperature field on tool and mould surface;
(C) obtain the temperature at tool and mould edge according to the distance at light source and tool and mould edge, transformation temperature and the fusing point of lip temperature and tool and mould compared:
(C.1) if lip temperature higher than fusing point, tool and mould is when accepting light source irradiation, the tool and mould edge can liquefy, will strengthen light source and move an offset or dish towards the direction away from the tool and mould edge, concrete mode is: utilize finite element software to carry out emulation, obtain the temperature field of hot spot irradiation area by finite element thermal analysis, offset or dish is determined according to the ratio of the grid number that the tool and mould size of the tool and mould size of scanning direction and scanning direction is divided; Re-execute step (B);
(C.2) if lip temperature lower than transformation temperature, the tool and mould edge can't undergo phase transition and can't reach enhancement purpose, will strengthen light source and move an offset or dish towards the direction near the tool and mould edge, re-executes step (B);
(C.3) if lip temperature higher than transformation temperature and lower than fusing point, obtains the current distance of strengthening light source and tool and mould edge, strengthen distance with this current distance as the best.
CN 201010180617 2010-05-24 2010-05-24 Method for strengthening edges of tool and die based on laser transformation hardening CN101845539B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201010180617 CN101845539B (en) 2010-05-24 2010-05-24 Method for strengthening edges of tool and die based on laser transformation hardening

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201010180617 CN101845539B (en) 2010-05-24 2010-05-24 Method for strengthening edges of tool and die based on laser transformation hardening

Publications (2)

Publication Number Publication Date
CN101845539A CN101845539A (en) 2010-09-29
CN101845539B true CN101845539B (en) 2013-06-19

Family

ID=42770357

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201010180617 CN101845539B (en) 2010-05-24 2010-05-24 Method for strengthening edges of tool and die based on laser transformation hardening

Country Status (1)

Country Link
CN (1) CN101845539B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108531714A (en) * 2018-07-04 2018-09-14 北京航空航天大学 A kind of multi-Precision optimization method that mortise structure is laser impact intensified

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103984094B (en) * 2014-05-22 2017-04-12 中国科学院光电技术研究所 Optical system heat performance simulation method
CN105701316B (en) * 2016-02-29 2018-10-09 中国飞机强度研究所 A kind of testpieces temperature control point position selecting method under power heat integration effect
CN106521101A (en) * 2016-10-10 2017-03-22 深圳领威科技有限公司 Method for promoting depression resistance of template surface and template surface strengthening equipment
CN107907566A (en) * 2017-12-11 2018-04-13 中钢集团邢台机械轧辊有限公司 A kind of test method for predicting metal material laser hardening depth

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1534099A (en) * 2003-03-28 2004-10-06 中国科学院力学研究所 Method and system for fortifying trance and distribution controllable material surface laser fortificating
CN101109032A (en) * 2007-08-17 2008-01-23 沈阳大陆激光成套设备有限公司 Technique of laser hardening ossifying process of vehicle mold

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5839728A (en) * 1981-09-02 1983-03-08 Toshiba Corp Laser hardening method
KR100467487B1 (en) * 2001-10-26 2005-01-24 현대자동차주식회사 Method for strengthening of Steel Sheets for Automobile and thereof Products
KR20100047619A (en) * 2008-10-29 2010-05-10 주식회사 성우하이텍 Heat treatment device and method of metallic pattern

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1534099A (en) * 2003-03-28 2004-10-06 中国科学院力学研究所 Method and system for fortifying trance and distribution controllable material surface laser fortificating
CN101109032A (en) * 2007-08-17 2008-01-23 沈阳大陆激光成套设备有限公司 Technique of laser hardening ossifying process of vehicle mold

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JP昭58-39728A 1983.03.08
顾建强,等.激光熔敷残余应力场的数值模拟.《红外与激光工程》.2009,第38卷(第增刊期),462-467. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108531714A (en) * 2018-07-04 2018-09-14 北京航空航天大学 A kind of multi-Precision optimization method that mortise structure is laser impact intensified
CN108531714B (en) * 2018-07-04 2019-05-10 北京航空航天大学 A kind of multi-Precision optimization method that mortise structure is laser impact intensified

Also Published As

Publication number Publication date
CN101845539A (en) 2010-09-29

Similar Documents

Publication Publication Date Title
Zhang et al. How to achieve the 2030 CO2 emission-reduction targets for China's industrial sector: retrospective decomposition and prospective trajectories
Yoon et al. A comparison of energy consumption in bulk forming, subtractive, and additive processes: Review and case study
Mani et al. Sustainability characterisation for manufacturing processes
Ren et al. An improved gravitational search algorithm for profit-oriented partial disassembly line balancing problem
Yi et al. Multi-objective parameter optimization of CNC machining for low carbon manufacturing
Yildiz Hybrid Taguchi-differential evolution algorithm for optimization of multi-pass turning operations
Rao et al. Multi-objective optimization of machining and micro-machining processes using non-dominated sorting teaching–learning-based optimization algorithm
Nie et al. Experimental study and modeling of H13 steel deposition using laser hot-wire additive manufacturing
Yıldız A new design optimization framework based on immune algorithm and Taguchi's method
Kumar et al. Machining efficiency evaluation of cryogenically treated copper electrode in additive mixed EDM
Le Bourhis et al. Predictive model for environmental assessment in additive manufacturing process
Zhu et al. An improved shuffled frog-leaping algorithm to optimize component pick-and-place sequencing optimization problem
Rao et al. A new multi-objective Jaya algorithm for optimization of modern machining processes
Yildiz Optimization of multi-pass turning operations using hybrid teaching learning-based approach
Park et al. Optimization of injection molding process for car fender in consideration of energy efficiency and product quality
Buffa et al. FEM based prediction of phase transformations during friction stir welding of Ti6Al4V titanium alloy
Tseng et al. Simulation study on laser cladding on preplaced powder layer with a tailored laser heat source
Vundavilli et al. Fuzzy logic-based expert system for prediction of depth of cut in abrasive water jet machining process
Meng et al. Mathematical modelling and optimisation of energy-conscious hybrid flow shop scheduling problem with unrelated parallel machines
CN103049623B (en) A kind of method for building up of laser bonding heat source model
Jain et al. Optimization of electro-chemical machining process parameters using genetic algorithms
CN104573237B (en) A kind of mould optimization method based on fretting wear CAE analysis
Madic et al. Ranking of some most commonly used nontraditional machining processes using ROV and CRITIC methods
Ma et al. An optimization approach of selective laser sintering considering energy consumption and material cost
Yang et al. Optimization of electric discharge machining using simulated annealing

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
CB03 Change of inventor or designer information

Inventor after: Luo Fang

Inventor after: Chen Zhijun

Inventor after: Hu Xiaxia

Inventor after: Yang Youdong

Inventor after: Yao Jianhua

Inventor before: Luo Fang

Inventor before: Chen Zhijun

Inventor before: Hu Xiaxia

Inventor before: Yang Youdong

Inventor before: Yao Jianhua

C53 Correction of patent for invention or patent application