CN101560595B - Induction heat processing method of truck longeron and device thereof - Google Patents
Induction heat processing method of truck longeron and device thereof Download PDFInfo
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- CN101560595B CN101560595B CN2008101327710A CN200810132771A CN101560595B CN 101560595 B CN101560595 B CN 101560595B CN 2008101327710 A CN2008101327710 A CN 2008101327710A CN 200810132771 A CN200810132771 A CN 200810132771A CN 101560595 B CN101560595 B CN 101560595B
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Abstract
The invention discloses an induction heat processing method of a truck longeron. The method comprises the steps of heating, quenching and deformation restriction, that is, the longeron passes a ventral reshaping roll and two airfoil reshaping rolls on a cooling fluid spray belt at the time of cooling, and is cooled under restriction of the ventral reshaping roll and the two airfoil reshaping rolls, the angle between the two airfoil surfaces and the ventral surface is 89-91 degrees, and the deviation along longitudinal direction is less than 0.5mm/m. The heat processing facility thereof mainlycomprises a heating device, a cooling device, a reshaping device and a computer controlling device. The induction heat processing method of the truck longeron and the corresponding processing devicescan help improve tensile strength of longeron material, thus creating conditions necessary for reducing dead weight of an entire truck, improving energy utilization of fuel and the like, and greatly reducing production cost, and perfectly restricting various deformation forms during the induction heat processing of the truck longeron, reducing dead weight of the entire truck, reducing material consumption and process flows, avoiding the technical processes of punching after molding and the like, and improving production efficiency.
Description
Technical field
The invention belongs to the automobile production technical field, relate to induction quenching that is applied to the truck frame longeron and the method that limits its quenching strain or rather, and tooling.
Background technology
Longitudinal beam is the important load bearing component of truck.The longitudinal beam of truck: the longitudinal beam cross section is generally C type structure, and length is 5～12 meters, and the longeron plate thickness is 4～10mm, and outside of belly height is 230～320mm, belongs to typical elongated slot ellbeam structure, as shown in Figure 1.The longeron of domestic use generally is the dull and stereotyped moulding via punching press or roll extrusion cold working, and its material is a low-carbon low-alloy steel, carbon content 0.10%～0.35%.
Along with the light-weighted development of truck car load, the intensity of longitudinal beam material is had higher requirement.For satisfying the requirement that the longeron strength of materials is improved constantly, domestic iron and steel supplier has strengthened the more exploitation of the steel grade of high intensity levels, and the steel grade of high intensity levels constantly occurs.But because the particular requirement of longeron moulding process, high-strength steel is all had higher requirement to technology such as uncoiling, leveling, shearing so that impact briquetting commonly used and processing units, and this limits the application of high intensity levels steel grade greatly.
The domestic heat treatment technics that does not also have at present at the long girder construction of vehicle frame flute profile longeron.Longitudinal beam is owing to have unrelieved stress in the machine-shaping process, sharply heating and cooling in heat treatment process very easily produces distortion under the comprehensive action of structural stress that forming residual stress, thermal stresses and the heat treatment phase sell of one's property are given birth to etc.Mode of texturing has to be received in two aerofoils or opens outward, outside of belly depression or epirelief, arch occurs along the longeron length direction, lateral bending and wholely distortion etc. occurs.As not adopting the restrained deformation measure, longeron is received in two aerofoils after thermal treatment or outer opening can reach more than the 10mm, and the length direction side sway can reach more than 2～3mm/m, and distortion is difficult to control, follow-up shaping process length consuming time, and effect is not ideal enough.
Thermal treatment truck longeron technology has had certain application in the world.As the patent of the U.S., patent No. US5968293 has mentioned a kind of longeron process of thermal treatment method and corresponding apparatus.But the longeron material of its use generally belongs to the category of medium carbon steel, and carbon content is greater than 0.30%, and the difference of carbon content has determined the difference of technological line.Its induction heat treatment process is generally: adopt the high-frequency induction Equipment for Heating Processing, comprise preheating, heating and three technological processs of after heat tempering, heat-processed is too much, thereby causes the heat radiation process long, the shortcoming that efficiency of energy utilization is not high.And external thermal treatment longeron is not for having hole forming, and heating uniformity control is relatively easy.
Summary of the invention
The present invention especially at be moulding and finish punching after longeron.The longeron that has fabrication hole and open holes easily forms superheat region around the hole in heat-processed, thermal treatment adds the thermal control difficulty.The invention provides a kind of induction heat processing method of truck longeron and equipment,, comprise induction heating, quench cooled and the method that limits its quenching strain promptly at the heat treating method of low-carbon low-alloy steel C type truck longeron, and tooling.
Induction heat processing method of truck longeron of the present invention comprises the steps:
(1) heating: the longeron after the moulding is by process furnace, and the heating frequency is more than the 1000Hz, and the process furnace heating makes longeron reach 50 ℃～100 ℃ of complete austenitizing temperature;
(2) quench cooled: temperature was higher than 910 ℃ when longeron quenched, and was cooled to strongly under about 400 ℃ through the spray cooling zone, formed low-carbon martensite;
(3) restrained deformation: in above-mentioned steps (2), the distortion that the restriction longeron produces in rapid heating and process of cooling, be that longeron promptly is with by orthopedic roller of the outside of belly and the orthopedic roller of two aerofoils at the cooling fluid spray simultaneously at refrigerative, under the restriction of orthopedic roller of the outside of belly and the orthopedic roller of two aerofoils, cool off, realize two aerofoils with outside of belly angle between 89 °～91 °, the length direction deviation is less than 0.5mm/m.
Between induction heating frequency 1000～4000Hz in the step (1), can make thickness of slab is that the longeron of 5～12mm forms diathermanous effect.
As adopting higher heating frequency is more than the 4000Hz, can be under athermanous situation, obtain abundant austenitizing in the longeron thickness direction near the outside in 2～3mm scope, and core temperature is lower, thereby obtaining the external region in process of cooling is low carbon martensite, and the center is a pearlitic structure, can obtain better toughness.
The process furnace shape has the degree of lip-rounding and with the C shape of longeron shape phase profiling, also can adopt the modified version process furnace.
It is outwardly-bent respectively that the modified version process furnace is about to the inside and outside outside of belly of the corresponding longeron of process furnace ruhmkorff coil partly, strengthen its distance with outside of belly part inside and outside the longeron, guarantee two uniform whiles of aerofoil Heating temperature of longeron, process furnace can impel longeron outside of belly temperature to reduce by 200 ℃～400 ℃ in the change of shape of longeron outside of belly heating location, reduce on the one hand because longeron outside of belly fabrication hole, peripheral region, the hole superheated problem that the existence of open holes etc. brings, then can make full use of the characteristics that cardiac stress increases gradually to two aerofoils in the longitudinal beam outside of belly more on the other hand, thereby reduce the distortion in heating and the follow-up process of cooling, improve the load-carrying properties of whole longeron, and bring great convenience for the processing of vehicle frame subsequent openings.
After process furnace is left in longeron zone after the heating, also can then can obtain better orthopedic effect by behind process furnace, increasing pre-orthopedic roller before the quenching spray equipment
In the step (2), low-carbon and low-alloy longeron after the heating is by the pressure and the Flow-rate adjustment of chilling spray liquid (mist), temperature behind the control longeron process cooled region is about 200 ℃, utilize surplus temperature to finish the self-tempering journey, thereby obtain better toughness and comprehensive mechanical property, remove the drawing process after the quenching from, simplify technology, reduce energy consumption.
Truck longeron Induction Heat Treatment Equipment of the present invention comprises: heating unit, form by process furnace and controller thereof; Refrigerating unit comprises heating furnace body cooling, spray cooling two portions; Orthopedic appliance is made of orthopedic roller, orthopedic section of master, follow-up assistant orthopedic section behind orthopedic appliance leading portion, the process furnace; Computer-controlled apparatus comprises upper computer module, programmable logic controller module, variable-frequency motor, infrared temperature sensor, positional sensor devices.Connecting heating unit behind the orthopedic appliance leading portion, connect orthopedic roller behind the process furnace then, then is refrigerating unit; Connecting main orthopedic section behind the refrigerating unit, is thereafter follow-up assistant orthopedic section.In computer-controlled apparatus, upper computer module connects with the programmable logic controller module, and the data in the technological process that storage programmable logic controller module sends are also analyzed it; Variable-frequency motor provides power for orthopedic appliance; After infrared temperature sensor is installed in process furnace, measure the temperature of heating floor side member, and temperature signal is sent to plc, plc sends command adapted thereto according to temperature signal to process furnace, thus the formation temperature closed-loop control.
Above-mentioned orthopedic appliance can be subdivided into by orthopedic roller, main orthopedic section, follow-up assistant orthopedic section behind orthopedic appliance leading portion, the process furnace according to orthopaedic function and position; Orthopedic appliance leading portion, clamping longeron improve the rigidity of longeron at the process furnace fore-end, reduce its distortion in heating and process of cooling generation; Orthopedic roller behind the process furnace, directly contact with the longeron that is in the red heat state after the heating, thereby by regulating the total amount generation distortion that can limit the red sun state or giving the distortion that its rightabout predeformation of spray cooling strain of quenching reduces longeron generation in the process of cooling; Main orthopedic section, suppress the distortion that longeron produces in the quench cooled process; And follow-up assistant orthopedic section, the cooled longeron of clamping, the rigidity of raising longeron reduces its distortion in heating and process of cooling generation.
Truck longeron Induction Heat Treatment Equipment of the present invention can also comprise pay-off, drawing mechanism and proofing unit.Before pay-off connects heating unit, connect drawing mechanism and proofing unit behind the orthopedic appliance.
The present invention has following technique effect:
(1) by induction heat processing method of truck longeron of the present invention and corresponding processing unit, longeron material (carbon content 0.10%～0.35%) can be contained tensile strength is promoted to more than the 900MPa from 510MPa, significantly improve material use efficiency, thereby for realizing that car load reduces deadweight, promote fuel oil equal energy source utilization ratio, reduce manufacturing cost significantly and created prerequisite.
(2) the present invention has limited the various deformation mode in the truck longeron induction heat treatment process preferably, finally realize two aerofoils with outside of belly angle between 89 °～91 °, the length direction deviation is less than 0.5mm/m, can satisfy the requirement of vehicle frame assembling.
(3) longeron handled after the reinforcement of the present invention can reduce the car load deadweight under the situation of same load, reduces materials consumption, reduces technical process, and the bicycle steel consumption can reduce by 100～200 kilograms.
(4) the present invention can promote longeron material mechanical property not changing on technical process such as existing hot rolled plate uncoiling, leveling, shearing, shaping and the relevant processing units basis, exempts after the moulding technological processs such as punching, has improved production efficiency.
Description of drawings
Fig. 1 is a variable cross-section longeron sectional view.
Fig. 2 is the layout diagram of longeron Equipment for Heating Processing system.
Fig. 3 is the versatible furnace shape figure of heating in medium frequency stove.
Fig. 4 is the C type profiling body of heater shape figure of heating in medium frequency stove.
Fig. 5 is the improvement body of heater shape figure of heating in medium frequency stove.
Fig. 6 is the orthopedic roller-way of a thermal treatment place enlarged view.
Fig. 7 is a kind of orthopedic roller constitutional diagram.
Fig. 8 is another kind of orthopedic roller constitutional diagram.
Fig. 9 is the nozzle layout of sprinkler figure of atomization sprayer.
Figure 10 is the nozzle layout of sprinkler figure of common spray thrower.
Each label component names:
1-longeron 2-is power supply and control device 9-spray equipment 10-spray control device and orthopedic section horizontal blanking unit of 12-of spray liquid storage casing 11-master of the orthopedic driving roll 5a-of material unit 3-vertically-guided roller 4-horizontal transmission roller 5-level top roll 5b-lower roll 6-power unit 7-process furnace 8-heating furnace body transversely
Embodiment
Embodiment 1.Present embodiment is at the longeron material of carbon content in 0.10%～0.18% interval.Describe embodiments of the invention with reference to the accompanying drawings in detail.
Induction heat processing method of truck longeron of the present invention comprises the steps:
(1) heating: the longeron after the moulding is heated to more than 960 ℃ at process furnace, reaches the complete austenitizing temperature, and the heating frequency is 1000～4000Hz.
(2) quench cooled: temperature was higher than 910 ℃ when longeron quenched, and was cooled to strongly under about 400 ℃ through the spray cooling zone, formed low-carbon martensite.
(3) restrained deformation: in above-mentioned steps (2), the distortion that the restriction longeron produces in rapid heating and process of cooling, be that longeron promptly is with by orthopedic roller of the outside of belly and the orthopedic roller of two aerofoils at the cooling fluid spray simultaneously at refrigerative, under the restriction of orthopedic roller of the outside of belly and the orthopedic roller of two aerofoils, cool off, realize two aerofoils with outside of belly angle between 89 °～91 °, the length direction deviation is less than 0.5mm/m.
Step (1) heating: longeron is passing through process furnace in the traveling process forward fast on tooling of the present invention.Longeron part by process furnace is heated to more than the austenitizing temperature 50 ℃～100 ℃ rapidly.For the low-carbon low-alloy steel of carbon content 0.1～0.18% scope, its Heating temperature is not less than 960 ℃.
Process furnace can adopt the mode that can heat longeron rapidly, as induction heating, quick flame spraying heating etc.
Induction heater heating efficiency height, heats is better, and present method adopts induction heating mode.The induction heating frequency is 1000～4000Hz, and can make thickness of slab under this frequency is that the longeron of 5～12mm forms diathermanous effect.
Can be under athermanous situation more than the higher heating frequency 4000Hz as adopting, obtain abundant austenitizing in the longeron thickness direction near the outside in 2～3mm scope, and core temperature is lower, thereby obtaining the external region in process of cooling is low carbon martensite, and the center is a pearlitic structure, can obtain better toughness.
The process furnace shape has the degree of lip-rounding and with the C shape of longeron shape phase profiling, also can adopt the modified version process furnace.
Degree of lip-rounding process furnace can have better longeron trafficability characteristic, is convenient to heat the variable cross-section longeron, as shown in Figure 3.
The process furnace of C shape profiling has higher heating efficiency, as Fig. 4.
Fig. 5 is a modified version process furnace shape: the ruhmkorff coil of outside of belly part inside and outside the corresponding longeron of process furnace is outwardly-bent respectively, strengthen its distance with outside of belly part inside and outside the longeron, guarantee two uniform whiles of aerofoil Heating temperature of longeron, process furnace can impel longeron outside of belly temperature to reduce by 200 ℃～400 ℃ in the change of shape of longeron outside of belly heating location, reduce on the one hand because longeron outside of belly fabrication hole, peripheral region, the hole superheated problem that the existence of open holes etc. brings, then can make full use of the characteristics that cardiac stress increases gradually to two aerofoils in the longitudinal beam outside of belly more on the other hand, thereby reduce the distortion in heating and the follow-up process of cooling, improve the load-carrying properties of whole longeron, and bring great convenience for the processing of vehicle frame subsequent openings.
Heating region is the zone of longeron in process furnace, thereby along with longeron is advanced forward and heated whole longeron or select the zone to heat.The different force request of vehicle frame different zones when so-called selectable heating is meant according to Vehicle Frame Design is heat-treated reinforcement to the longeron zone of strengthening requirement is arranged.This point is different from the whole present disposable heat-treating methods of longeron of North America, can make full use of material property, and save energy.
Step (2) cooling: quenching by the strong spray of cooling fluid during through cooled region in the zone after the longeron heating, impels it to be cooled to the martensite formation temperature rapidly from austenitizing temperature, under about 400 ℃, is the longeron of low carbon martensite thereby obtain microtexture.
Through this process of overcooling, the load-carrying properties of longeron are significantly improved, and can obtain the above tensile strength of 900MPa, and because microtexture is a low carbon martensite, it still possesses certain toughness.
Above-mentioned cooling fluid can adopt water, salt, alkali and other can realize quick refrigerative cooling fluid.By spray equipment as shown in figure 10, spray surfaces externally and internally uniformly, evenly cooling longeron rapidly to longeron.The spray coolant pressure is 0.2～0.5MPa, and the spray liquid flow is 20～60m
3/ hour.
The spray liquid type of cooling can also adopt the gas-liquid mixed atomizing, by regulating water, airshed and pressure ratio of mixture, regulate the speed of cooling behind the longeron material austenitizing, thereby obtain the different longeron microstructure of metals that require, with this mechanical property that obtains requiring.This type of cooling can make longeron obtain cooling more uniformly, cooled organize more stable, as Fig. 9.
Low-carbon and low-alloy longeron after the heating is by the pressure and the Flow-rate adjustment of chilling spray liquid (mist), can control longeron through the temperature behind the cooled region about 200 ℃, utilize surplus temperature to finish the self-tempering journey, thereby obtain better toughness and comprehensive mechanical property, drawing process after the quenching of removing from, simplify technology, reduce energy consumption.
Step (3) restrained deformation: the longeron zone after the heating is after leaving process furnace 7, promptly be with by the orthopedic roller 5 of the outside of belly simultaneously at refrigerative at the cooling fluid spray, cool off under the restriction of the orthopedic roller 3 of two aerofoils, limited the various deformation mode in the above-mentioned heat treatment process preferably, final realize two aerofoils with outside of belly angle between 89 °～91 °, the length direction deviation can satisfy the requirement of vehicle frame assembling less than 0.5mm/m.
On step 1 basis, after process furnace 7 is left in the longeron zone after the heating, also can then can obtain better orthopedic effect by behind process furnace, increasing pre-orthopedic roller before the quenching spray equipment.
Embodiment 2: present embodiment is at the longeron material of carbon content in 0.18%～0.25% interval.Wherein Heating temperature is 950 ℃ in step 1; Temperature is higher than 900 ℃ when quenching in step 2, and cooling back temperature is lower than 400 ℃, and all the other conditions are with embodiment 1.
Embodiment 3: present embodiment is at the longeron material of carbon content in 0.25%～0.35% interval.Wherein Heating temperature is 900 ℃ in step 1; Temperature is higher than 850 ℃ when quenching in step 2, and cooling back temperature is lower than 355 ℃, and all the other conditions are with embodiment 1.
With reference to accompanying drawing, illustrate that truck longeron induction heat treatment process equipment of the present invention is as follows:
As shown in Figure 2, longeron 1 is placed in transversely on the material unit 2 side by side, and transversely material unit 2 is connected with the longeron longitudinal conveyor.Longitudinal conveyor drives longeron to process furnace direction horizontal transport by horizontal transmission roller 4, arranges vertically-guided roller 3 between the horizontal transmission roller 4, and the vertically-guided roller mainly plays lateral register and guide effect.To connection, orthopedic preceding section apparatus mainly is made of three groups of orthopedic driving rolls 5 of level longitudinal conveyor, also arranges vertically-guided roller 4 therebetween with the orthopedic appliance leading portion.Process furnace 7 is arranged in the back of these 3 groups of orthopedic driving rolls 5 of level, and process furnace power supply and control device 8 are arranged in process furnace 7 sides.Still having one group of orthopedic driving roll 5 of level behind the process furnace 7, after this is spray equipment 9, spray control device and spray liquid storage casing 10.Be main orthopedic section 11 behind next-door neighbour's spray equipment, be responsible for limiting its distortion simultaneously for main orthopedic section 11 at the longeron refrigerative.Be still two groups of orthopedic driving rolls 5 of level afterwards, arrange vertically-guided roller 3 therebetween.Thereafter be longitudinal conveyor, laterally blanking unit 12 links to each other with it.
(1) pay-off: pay-off is by transversely material unit 2, horizontal transmission roller 4, vertically-guided roller 3 are formed.Transversely material unit 2 is mainly finished longeron and is laterally delivered to vertical feeding unit, and its structure adopts the chain load mode.Horizontal transmission roller 4 contacts with the outside of belly under the longeron, by frictional force longeron is sent to process furnace along level.Many group vertically-guided rollers 3 are undertaken spacing and guiding by restriction longeron two aerofoil outside surfaces, guarantee the linearity of longeron at transport process.
(2) heating unit: heating unit mainly plays the longeron by heating region is partly quickly heated up to function more than the austenitizing temperature.Process furnace can consider to heat rapidly mode such as induction heating, the quick flame spraying heating etc. of longeron.Because induction heater heating efficiency height, heats is better.The induction heating frequency is 1000～4000Hz even higher, obtain to have different depth of hardening by adjusting induction heating frequency, heating power and the longeron speed by the induction heating zone, be the longeron of different thin hardened layer, thereby satisfy different product performance requirements.
The process furnace shape can have the degree of lip-rounding, with the C shape or the modified version process furnace of longeron shape phase profiling.Degree of lip-rounding process furnace as Fig. 3, can have better longeron trafficability characteristic, is convenient to heat the variable cross-section longeron.For obtaining isostatic heats more, the coil of process furnace has certain taper when twining.The process furnace of C shape profiling has higher heating efficiency, as Fig. 4.This kind shape body of heater, better in the heats of longeron internal surface, efficient is higher.Fig. 5 is a modified version process furnace shape, guarantee that longeron aerofoil Heating temperature is even, can impel longeron outside of belly temperature to reduce by 200 ℃～400 ℃ by process furnace in the change of shape of longeron outside of belly heating location, reduce on the one hand because longeron outside of belly fabrication hole, peripheral region, the hole superheated problem that the existence of open holes etc. brings, then can make full use of the characteristics that cardiac stress increases gradually to two aerofoils in the longitudinal beam outside of belly more on the other hand, thereby reduce the distortion in heating and the follow-up process of cooling, improve the load-carrying properties of whole longeron, and bring great convenience for the processing of vehicle frame subsequent openings.
(3) spray quench device: the longeron zone of austenitizing is by the spray quench zone time, and under the strong cooling effect of cooling fluid (gas-liquid mixed), obtaining microtexture is the longeron of low carbon martensite.Through this process, the load-carrying properties of longeron are significantly improved, and can obtain the above tensile strength of 900MPa, and because microtexture is a low carbon martensite, it still possesses certain toughness.Cooling fluid can adopt water, salt, alkali and other can realize quick refrigerative cooling fluid.
The spray quench device can have two kinds of implementations.A kind of spray equipment as shown in figure 10.The spray equipment surface is made up of the aperture of even layout, and spray liquid sprays surfaces externally and internally to longeron uniformly by the spray aperture, evenly cooling longeron rapidly.The spray coolant pressure is 0.2～0.5MPa, and the spray liquid flow is 20～60m
3/ hour.The different positions of spray equipment internal condition longeron such as outer web, bullnose, outer aerofoil and endosternum, filleted corner, inner airfoil surface etc. are separated into different independent cavitys, the spray pressure of each position, flow are regulated separately, regulate the final deflection of longeron by the speed of cooling of regulating longeron cross section different positions, realize the purpose of the final distortion of restriction longeron in conjunction with orthopedic appliance.
Another spray equipment is as shown in Figure 9: the spray liquid type of cooling can adopt the gas-liquid mixed atomizing, by regulating water, airshed and pressure ratio of mixture, regulate the speed of cooling behind the longeron material austenitizing, thereby obtain the different longeron microstructure of metals that require, with this mechanical property that obtains requiring.This type of cooling can make longeron obtain cooling more uniformly, cooled organize more stable.
(4) orthopedic appliance: orthopedic appliance mainly is made of as Fig. 7, shown in Figure 8 orthopedic driving roll of a series of levels and longitudinally guiding roller etc.; Can be subdivided into orthopedic roller behind orthopedic appliance leading portion, the process furnace, main orthopedic section and follow-up assistant orthopedic section according to orthopaedic function and position.After the orthopedic appliance leading portion is positioned at pay-off.Orthopedic roller is positioned at behind the process furnace before the spray equipment behind the process furnace.Main orthopedic section be positioned at spray equipment after.After follow-up assistant orthopedic section is positioned at main orthopedic section, before the blanking device.
A) orthopedic appliance leading portion: longeron is delivered to the orthopedic appliance leading portion by pay-off, is sent to process furnace under the drive by three pairs of orthopedic driving rolls 5 of level.Horizontal pressure roller provides snap-in force by hydraulic efficiency system.Three groups of pressure rollers compress longeron in longeron outside of belly vertical direction, gait of march is even in the time of can guaranteeing on the one hand that longeron passes through process furnace, can keep longeron on its length direction, to keep straight on the other hand, thereby the heating process of cooling is being limited along the distortion on the longeron length direction.The orthopedic driving roll 5 of level is divided into top roll 5a, lower roll 5b, and top roll 5a and lower roll 5b possess adjustable in short transverse, can adjust in the distortion of outside of belly normal direction at longeron.Two rollers can be sent in the vertical plane along longeron under hydraulic efficiency system drives and move up and down, and when longeron variable cross-section section was passed through, up-down rollers was separated, and had guaranteed the trafficability characteristic of longeron.Many group edger rolls 3 guarantee that longeron transmits the into linearity of heating furnace process.
B) orthopedic roller behind the process furnace: seeing Fig. 6, is one group of orthopedic roller 5 behind the process furnace 7.The distortion that mainly act as smooth heating floor side member web of orthopedic roller herein, and can under longeron red heat state, apply a reversible deformation to reduce longeron to longeron in advance through cooled distortion by adjusting as required.
C) main orthopedic section: follow after spray equipment for main orthopedic section, by orthopedic driving roll 5 of level and 3 tight compound compositions of vertically-guided roller.Vertically-guided roller 3 is divided into two groups and is positioned at the orthopedic driving roll of level 5 front and back respectively.The vertically-guided roller 3 that wherein is positioned at the front follows closely after the spray equipment 9, act as the distortion that limits longeron two aerofoils at longeron spray refrigerative simultaneously.3 on vertically-guided roller behind the orthopedic driving roll 5 of the level that is positioned at replenishes restriction aerofoil metamorphosis and guide effect.
Play the effect of opening distortion outside the restriction longeron aerofoil for the orthopedic driving roll 5 of level is double in the distortion of the restriction longeron outside of belly shown in Fig. 7, the distortion of aerofoil inward direction is then by a pair of vertically-guided roller 3 restrictions.
Be another kind of orthopedic mode among Fig. 8, the distortion of aerofoil direction is fully by 3 restrictions of two pairs of vertically-guided rollers, and the distortion of the longeron outside of belly is by orthopedic driving roll 5 restrictions of level.In the dual mode, roll under the orthopedic driving roll of level the 5b width less than on roll 5a, guaranteed the installing space of the orthopedic roller of aerofoil.
D) follow-up assistant orthopedic section: after main orthopedic section 11 is by two groups of orthopedic driving rolls 5 of level and the vertically-guided roller 3 alternate assistant orthopedic devices that form.Two groups of orthopedic driving rolls 5 of level clamp the longeron outside of belly and drive longeron and forward under the effect of hydraulic coupling, play simultaneously to prevent that the effect of arch distortion from appearring in longeron.
The present invention is suitable for longeron after finishing punching (boring) technology, heat-treats, i.e. have component open holes, fabrication hole and various pipeline before the longeron thermal treatment by the hole, no longer carries out punching (bore process) after the thermal treatment.Be equally applicable to longeron and carry out punching (boring) work by the hole of component open holes, fabrication hole and various pipeline again after thermal treatment, then the control of longeron heat treatment process temperature is more stable, and thermal treatment metapore formed precision is better.
The present invention describes with reference to drawings and Examples, but protection domain is not limited thereto, and has those of ordinary skill and can pass through simple conversion in the technology of the present invention scope, and obtain the same technique effect of the present invention, equally in protection scope of the present invention.
Claims (10)
1. an induction heat processing method of truck longeron is characterized in that comprising the steps:
(1) heating: the longeron after the moulding is by process furnace, and process furnace is heated to more than 900 ℃, and the heating frequency is 1000-4000Hz, makes longeron reach above 50 ℃～100 ℃ of complete austenitizing temperature;
(2) quench cooled: temperature was higher than 850 ℃ when longeron quenched, and was cooled to strongly under 400 ℃ through the spray cooling zone, formed low-carbon martensite;
(3) restrained deformation: in above-mentioned steps (2), the distortion that the restriction longeron produces in rapid heating and process of cooling, be that longeron promptly is with by orthopedic roller of the outside of belly and the orthopedic roller of two aerofoils at the cooling fluid spray simultaneously at refrigerative, under the restriction of orthopedic roller of the outside of belly and the orthopedic roller of two aerofoils, cool off, realize two aerofoils with outside of belly angle between 89 °～91 °, the length direction deviation is less than 0.5mm/m.
2. a kind of induction heat processing method of truck longeron as claimed in claim 1 is characterized in that step (1) Heating temperature is 960 ℃; Temperature is higher than 910 ℃ when quenching in step (2), and cooling back temperature is lower than 400 ℃.
3. a kind of induction heat processing method of truck longeron as claimed in claim 1 is characterized in that step (1) Heating temperature is 950 ℃; Temperature is higher than 900 ℃ when quenching in step (2), and cooling back temperature is lower than 400 ℃.
4. a kind of induction heat processing method of truck longeron as claimed in claim 1 is characterized in that step (1) Heating temperature is 900 ℃; Temperature is higher than 850 ℃ when quenching in step (2), and cooling back temperature is lower than 355 ℃.
5. as the arbitrary described a kind of induction heat processing method of truck longeron of claim 1-4, it is characterized in that the process furnace in the step (1) adopts the modified version process furnace, the ruhmkorff coil that is about to the inside and outside outside of belly part of the corresponding longeron of process furnace is outwardly-bent respectively, strengthen its distance with outside of belly part inside and outside the longeron, guarantee two uniform whiles of aerofoil Heating temperature of longeron, process furnace can impel longeron outside of belly temperature to reduce by 200 ℃～400 ℃ in the change of shape of longeron outside of belly heating location.
6. as the arbitrary described a kind of induction heat processing method of truck longeron of claim 1-4, it is characterized in that in the step (2), low-carbon and low-alloy longeron after the heating is by the pressure and the Flow-rate adjustment of chilling spray liquid or mist, and the temperature behind the control longeron process cooled region is at 200 ℃.
7. as the arbitrary described a kind of induction heat processing method of truck longeron of claim 1-4, it is characterized in that step after step (1), after process furnace is left in the longeron zone after the heating, behind process furnace before the quenching spray equipment, increase pre-orthopedic roller, obtain better orthopedic effect.
8. a truck longeron Induction Heat Treatment Equipment is characterized in that mainly being made of heating unit, refrigerating unit, orthopedic appliance, computer-controlled apparatus; Heating unit is made up of process furnace and controller thereof; Refrigerating unit comprises heating furnace body cooling, spray cooling two portions; Orthopedic appliance mainly is made of orthopedic driving roll of a series of levels and longitudinally guiding roller, comprises main orthopedic section and follow-up assistant orthopedic section; Computer-controlled apparatus comprises upper computer module, programmable logic controller module, variable-frequency motor, infrared temperature sensor, positional sensor devices; Connecting heating unit behind the orthopedic appliance leading portion, connect orthopedic roller behind the process furnace then, is refrigerating unit then, connects main orthopedic section behind the refrigerating unit, is thereafter follow-up assistant orthopedic section, and process furnace and refrigerating unit are arranged in each section of orthopedic appliance.
9. a kind of truck longeron Induction Heat Treatment Equipment as claimed in claim 8 is characterized in that described orthopedic appliance can be subdivided into by orthopedic roller, main orthopedic section, follow-up assistant orthopedic section behind orthopedic appliance leading portion, the process furnace according to orthopaedic function and position; Orthopedic appliance leading portion, clamping longeron improve the rigidity of longeron at the process furnace fore-end, reduce its distortion in heating and process of cooling generation; Orthopedic roller behind the process furnace, directly contact with the longeron that is in the red heat state after the heating, thereby by regulating the longeron generation distortion that can limit the red heat state or giving the distortion that its rightabout predeformation of spray cooling strain of quenching reduces longeron generation in the process of cooling; Main orthopedic section, be connected refrigerating unit after, suppress the distortion that longeron produces in the quench cooled process; And follow-up assistant orthopedic section, after main orthopedic section, the cooled longeron of clamping, the rigidity of raising longeron reduces its distortion in heating and process of cooling generation.
10. a kind of truck longeron Induction Heat Treatment Equipment as claimed in claim 8 is characterized in that also comprising pay-off, drawing mechanism and proofing unit, before pay-off connects heating unit, connects drawing mechanism and proofing unit behind the orthopedic appliance.
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| CN2008101327710A CN101560595B (en) | 2008-07-14 | 2008-07-14 | Induction heat processing method of truck longeron and device thereof |
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| CN2008101327710A CN101560595B (en) | 2008-07-14 | 2008-07-14 | Induction heat processing method of truck longeron and device thereof |
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| CN102248360B (en) * | 2011-04-28 | 2013-04-24 | 东风汽车有限公司 | Manufacturing method of frame longitudinal beam and frame longitudinal beam manufactured by same |
| CN102181620A (en) * | 2011-05-06 | 2011-09-14 | 山西北方惠丰机电有限公司 | Method for heat treatment of perforated laminating parts |
| CN103028920B (en) * | 2011-09-30 | 2016-08-31 | 鞍钢重型机械有限责任公司 | Tunnel U-shaped steel bracket Plastic recovery machine |
| CN113930603A (en) * | 2021-10-18 | 2022-01-14 | 一汽解放汽车有限公司 | Method for prolonging fatigue life of frame longitudinal beam, longitudinal beam structure and heat treatment device |
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