CN101103128A - Heat treatment method in press-fit connection and connection structure by the press-fit connection - Google Patents
Heat treatment method in press-fit connection and connection structure by the press-fit connection Download PDFInfo
- Publication number
- CN101103128A CN101103128A CNA200580031823XA CN200580031823A CN101103128A CN 101103128 A CN101103128 A CN 101103128A CN A200580031823X A CNA200580031823X A CN A200580031823XA CN 200580031823 A CN200580031823 A CN 200580031823A CN 101103128 A CN101103128 A CN 101103128A
- Authority
- CN
- China
- Prior art keywords
- pressed
- mentioned
- joint
- junction surface
- treating method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- C21D1/26—Methods of annealing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
- B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
-
- 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
Abstract
A heat treatment method and a connection structure in a press-fit connection of element members forming a metal element part capable of developing excellent corrosive resistance and pressure resistance. A second member is pressed into the hole of a first member with a prescribed pressure, a current is applied across these both members to generate an electrical resistance heat at a connection part therebetween, and the second member is press-fitted into the hole part so as to form a connection boundary surface in a connection surface part between the second member and the inner wall surface part of the hole part so that the press-fit connection is brought into the state of solid phase. The connection part by the press-fit connection is heated, held, and tempered to disperse and dissipate the connection part, and the metallographic structures of both members connected to each other by the press-fit connection at the connection part are integrally formed or homogenized.
Description
Technical field
The member that the present invention relates to constitute metal system key part each other be pressed into heat treating method in the joint and consequent connected structure.
Background technology
In the past, when utilizing so-called welding to come fusion to engage the member that constitutes the physical construction thing, the bonding wire of the boundary that the expression member is engaged with each other forms the melting and solidification tissue.Usually, by welding under the situation that metallic substance is bonded with each other, when engaging the bonding wire that forms two members by fusion, it is very difficult mainly eliminating this bonding wire that is formed by solidified structure by thermal treatment.In addition, above-mentioned melting and solidification tissue unless carry out the thermal treatment (about 1150 ℃) of diffusion annealing shown in Figure 7, is difficult to eliminate above-mentioned bonding wire.Therefore, usually,, be to remove residual stress or improve mechanical properties for the purpose that heat-treat at the junction surface that is produced by welding, do not seek to make metal structure homogenizing between the member, integrated.In patent documentation 1,2 relevant for for member resistance welding each other, the record of projection welding.
Here, applicant of the present invention had disclosed in patent documentation 3,4 and be pressed into connected structure in the past.As Fig. 9 (a) (b) shown in, as workpiece, utilize anchor clamps will be pressed on the plate (penetrating the hole portion 3 that is provided with) that joins to as first member 2 as the axis body (cross section is similar to the shape of hole portion 3) of second member 4, in addition, as another form, will be pressed on the cylindrical shell that joins to as first member as the cylindrical shell of second member.The above-mentioned anchor clamps that use in being pressed into joint have the chromium patrix 12 made of copper that top is provided with the chromium counterdie 10 made of copper of cylindrical hole portion and is provided with cylindrical hole portion in the bottom.These counterdies 10 and patrix 12 have the function of electrode respectively, can switch between two moulds, and patrix 12 adds drops.
As the condition that is pressed into, that sets regulation is pressed into surplus (internal diameter (D1) of the hole portion 3 of external diameter (D2)-first member 2 of d=second member 4) and compression distance (degree of depth that h=second member 4 is pressed into).When engaging, respectively above-mentioned first member 2 is installed on the counterdie 10, second member 4 is installed on the patrix 12, apply certain plus-pressure, pushing patrix 12, simultaneously, energising between first member 2 and second member 4.Like this, be accompanied by the heat that has a resistance, begin being pressed into of second member 4, the junction surface of second member 4 descends in the hole portion 3 of first member 2 and moves.In this case, shown in Fig. 9 (b), second member 4 is pressed in the hole portion 3 of first member 2, at this moment, the effect of attenuate pull and stretch takes place on the joint interface of two members.Be pressed into joint by attenuate pull and stretch process for machining and manufacturing.
At this moment, form the joint interface 8 of Solid-phase welding at the junction surface 6 of first member 2 and second member 4.Figure 10 (a) is near the macrograph the above-mentioned junction surface that is pressed into joint, and this figure (b) is the enlarged photograph at junction surface.Here, form the joint interface at junction surface at the above-below direction of this figure (b), be pressed in the joint at this, in order to carry out good joint, joint interface 8 is fine and close.
On above-mentioned joint interface 8, each wall by first member 2 and second member 4 is thinned pull and stretch moving of slip direction each other, thereby the impurity layer on surface is reamed, and with cleaning surfacesization, carries out Solid-phase welding at the tissue of this cleaning.In addition, because additional attenuate deep-drawing technique in this joint, so, big viscous deformation takes place at the junction surface, metal structure, crystallization crystal grain also become broken worked structure, and it is not high to the degree that makes metallic material to be risen by the temperature that the resistance heat that is given in this bonding method causes, so, recrystallize is not carried out in the worked structure of this fragmentation, and left behind.In addition, in the thermal treatment that utilizes welding machine to carry out,, be very difficult to obtain such recrystallize effect if consider its heating efficiency etc.
Patent documentation 1: the spy opens flat 7-1150 communique
Patent documentation 2: the spy opens flat 8-174234 communique
Patent documentation 3: the spy opens 2001-353628
Patent documentation 4: the spy opens 2004-114146
In addition, for trolley part etc.,, carry out carburizing treatment mostly in order to improve purposes such as wear resistance, intensity.But, under the situation that the welding assembly that member is welded to each other permeates,, usually, be coated with the carbon agent of deploying troops on garrison duty etc. or carrying out carrying out carburizing treatment again after the so anti-carbon of plating handles in order not carry out osmotic treated at this weld part.
Why member weld part each other not being carried out carburizing treatment, is because can produce welding flaws such as pore, crackle at weld part, by carburizing treatment, makes the weld part hardening, can produce the problem of toughness reduction, stress concentration equal strength aspect.In addition, usually, because above-mentioned weld part is the part that there is no need to improve surface strength, so, consider these factors, in order not carry out carburizing treatment, and prevent the carbon processing at weld part.
Thereby, be pressed in the bonding method above-mentioned, particularly, under the situation of carrying out carburizing treatment material joint each other, the rapid cooling after the overheated and end during by this joint, the junction surface of osmosizing portion becomes martensitic stucture, and becoming is highly brittle.In order to prevent this situation,, outside joint technology, under former state remains on situation on the same welding machine, carry out tempering energising as the processing of appending in order to change over the tempered martensite that is ductile from crisp martensitic stucture.
Above-mentioned tempering is to carry out tempering (thermal treatment) energising, reheat once more between first member 2 and second member 4, still, because this heat treated power on condition and engaging condition are roughly the same, so, can not eliminate bonding wire.In addition, have above-mentioned bonding wire, existing under the situation of uneven tissue, it is poor to produce partial corrosion potential, causes local corrosion.The purposes that can not be used in this case, high corrosion resistance.In addition, the goods with this danger can not be used for having the purposes of functions such as high resistance to pressure, high-air-tightness, ductility, toughness.Like this, for requiring the junction surface to reach for the key part of the incorporate quality of Metallkunde, be necessary tissue.
In addition, for weld part not by carburizing, carry out above-mentioned anti-carbon and handle, be not function and the necessary technology of intensity in order to keep goods, it would be better to say that it is unwanted technology.And then weld part usually has three dimensional shapes, when considering labour that anti-carbon is handled and time etc., exists problems such as needing considerable man-hour and expense.
Summary of the invention
The present invention its objective is heat treating method and the connected structure in the joint of being pressed into that a kind of key part that can bring into play excellent erosion resistance, resistance to pressure, high-air-tightness, ductility, toughness etc. is provided in view of the above problems.
In order to solve above-mentioned technical task, according to the heat treating method that is pressed in the joint of the present invention, pressure with regulation is pressed to second member in the hole portion of first member, simultaneously, between these two members, switch on, make the heat that has a resistance at both junction surfaces, above-mentioned second member is pressed in the portion of above-mentioned hole, make and form joint interface with the facial place that engages of the inwall face of above-mentioned hole portion at above-mentioned second member, and, carry out the be pressed into joint of this joint as the joint of solid state shape, heating keeps engaging the junction surface that produces by above-mentioned being pressed into, and anneals, by this thermal treatment, disperse, eliminate the junction surface, make by above-mentioned being pressed into to engage and the integrated or homogenizing of metal structure at the place, junction surface of articulate two engagement members.
According to the heat treating method that is pressed in the joint of the present invention, above-mentioned first member and second member are the materials of identical material.
According to the heat treating method that is pressed in the joint of the present invention, above-mentioned heat treated temperature is more than recrystallization temperature.
According to the heat treating method that is pressed in the joint of the present invention, when use had the ferritic structure carbon steel, has the steel alloy of austenite structure or has the steel alloy of ferritic structure as above-mentioned materials, above-mentioned heat treated temperature was more than the A1 transformation temperature or more than the recrystallization temperature.
According to the heat treating method that is pressed in the joint of the present invention, the above-mentioned heating hold-time is more than one hour.In addition, according to the heat treating method that is pressed in the joint of the present invention, above-mentioned thermal treatment temp is below the temperature of diffusion annealing.
According to the heat treating method that is pressed in the joint of the present invention, pressure with regulation is pressed to second member in the hole portion of first member, simultaneously, between these two members, switch on, make the heat that has a resistance at both junction surfaces, above-mentioned second member is pressed into above-mentioned hole portion, make and form joint interface with the facial place that engages of the inwall face of above-mentioned hole portion at above-mentioned second member, and, carry out to engage the joint that is pressed into as the joint of solid state shape, heating keeps above-mentioned first member and second member that is pressed into joint, carry out carburizing, make the upper layer quench hardening of two members by this thermal treatment, and make by above-mentioned being pressed into and engage and the integrated or homogenizing of metal structure at the place, junction surface of articulate two members.
According to the heat treating method that is pressed in the joint of the present invention, the carbon processing is not prevented at the junction surface of above-mentioned first member and second member, by above-mentioned carburizing, make the upper layer quench hardening of two members that comprise above-mentioned junction surface.
According to the heat treating method that is pressed in the joint of the present invention, as the material of above-mentioned first member and second member, use general processing with steel, stainless steel, physical construction with carbon steel, physical construction with steel alloy or titanium.
According to the connected structure that is pressed in the joint of the present invention, be the structure that constitutes by above-mentioned first member that utilizes above-mentioned any one described heat treating method that is pressed in the joint to engage and second member.
According to the heat treating method that is pressed in the joint of the present invention, owing to carry out second member engages being pressed into joint in the hole portion of first member with solid state shape, and utilize annealing that the junction surface is heat-treated, keep disperseing to eliminate the junction surface by heating with the temperature more than the recrystallization temperature, so, can seek the integrated or homogenizing of the metal structure in the junction surface, carry out fine annealing, in addition, poor by between first member and second member, not producing corrosion potential, obtain good anti-corrosion, and then, the effect that can obtain the connected structure of excellent quality for resistance to pressure etc. had.In addition, owing to compare with general diffusion annealing temperature, this annealing is carried out under low temperature, so, have the metallic crystal that can prevent the mother metal except that the junction surface thickization, can prevent the reduction of the strength of materials, the effect of excellence such as flexible reduction.In addition, have and joint interface cleaned, engages well and the effect of excellent strength.
According to the heat treating method that is pressed in the joint of the present invention, owing to carry out second member engages being pressed into joint in the hole portion of first member at solid state shape, and by the upper layer quench hardening of carburizing with two members, make the metal structure at junction surface integrated, so, the upper layer hardness height of connected structure member, and tenacity excellent as a whole, intensity improves, in addition, owing to can seek the integrated or homogenizing of the metal structure at place, junction surface, and then, the junction surface has very the character near mother metal, so, for the junction surface, also the cementation zone of formation and the uniform carburized depth of mother metal part same degree valve has the effect of the connected structure member that obtains excellent quality.In addition, even, also can carry out carburizing treatment for integral body well owing to do not prevent the carbon processing at the junction surface of first member and second member, so, can omit anti-carbon treatment process, save the labour, can reduce cost.
Description of drawings
Fig. 1 is the diagram that be pressed into connected structure of utilizing first member of expression according to form of implementation of the present invention, (a) is orthographic plan, (b) is the A-A sectional view.
Fig. 2 is the diagram that be pressed into connected structure of utilizing second member of expression according to form of implementation of the present invention, (a) is orthographic plan, (b) is the B-B sectional view.
Fig. 3 is expression according to form of implementation, in the diagram of the metalloscope photo that be pressed into junction surface of test in (i), (a) being the photo of observing whole junction surface with low range (22.5 times), is doubly to observe the photo of the microstructure at junction surface with high magnification (100) (b).
Fig. 4 is expression according to form of implementation, in the diagram of the metalloscope photo that be pressed into junction surface of test in (ii), (a) being the photo of observing whole junction surface with low range (22.5 times), is doubly to observe the photo of the microstructure at junction surface with high magnification (100) (b).
Fig. 5 be expression according to form of implementation, carry out of test in (iii) the diagram of the metalloscope photo that is pressed into the junction surface after the annealing thermal treatment, (a) being the photo of observing whole junction surface with low range (37.5 times), (b) is the photo of observing the microstructure at junction surface with high magnification (400 times).
Fig. 6 is expression according to form of implementation, in the diagram of the metalloscope photo that be pressed into junction surface of test in (iv), (a) being the photo of observing whole junction surface with low range (37.5 times), is doubly to observe the photo of the microstructure at junction surface with high magnification (400) (b).
Fig. 7 is illustrated in the diagram that FeC is the annealing region in the equilibrium phase diagram (take from (society) Japanese iron steel association: bar steel, wire rod handbook).
Fig. 8 be expression according to second kind of form of implementation of the present invention, carrying out by the metalloscope photo that is pressed into the junction surface the thermal treatment of carburizing after (central authorities are to hold the slot part that overlap is used by last circular portion of deceiving).
Fig. 9 is the diagram of expression according to the prior art example, is to be pressed into the bonding method explanatory view (a), (b) is the diagram of the state after expression is pressed into.
Figure 10 represents to be pressed into the metalloscope photo at the junction surface in the joint, (a) be the photo (central authorities are to hold the slot part that overlap is used by last black circular portion) of observing whole junction surface with low range, (b) be the photo of observing the microstructure at junction surface with high magnification.
Nomenclature
22,26 first members
23,27 hole portions
24,28 second members
Embodiment
Below, based on description of drawings according to form of implementation of the present invention.
According to being pressed in the joint of this form of implementation,, omit its detailed description here with basic illustrate in the paragraph that engages relevant technology and effect and top prior art the same that be pressed into.
At first, describe for the thermal treatment that is pressed in the joint according to first kind of form of implementation.Fig. 1 represents the connected structure that is pressed into as the stainless steel (for example SUS304) of first kind of material use austenite.This is a kind ofly will be pressed into the structure that joins to as in the hole portion 23 of the circle of the plate 22 of first member as the columned axis body 24 of second member, and the material of each member all is above-mentioned SUS304.This material usually is difficult to welding.In addition, why using stainless steel, is because this material is used for the parts of requirement erosion resistance etc., attempts studying for the erosion resistance material.In addition, for the member that erosion resistance must be arranged, it is unfavorable that tissue odds spares, exists bonding wire etc.Be pressed into joint for this, making the diameter of above-mentioned hole portion 23 is 9.3mm, is pressed into surplus (d) and is 0.5mm, and compression distance (h) is 4.5mm.
Being pressed in the joint of above-mentioned member, as mentioned above, be pressed into certain plus-pressure, certain lowering speed, the junction surface was heated in moment, and the leading section of axis body 24 is pressed in the hole portion 23 of plate 22, finishes joint.At this moment, between the hole portion 23 of axis body 24 and plate 22, form the joint interface of Solid-phase welding.In Solid-phase welding, whether obtaining clean Surface on this junction surface, to organize this point to have influence on joint good.
According to the joint that is pressed into of this form of implementation, at above-mentioned joint interface, each wall by plate and axis body moving on slip direction each other is thinned pull and stretch, by this, the impurity layer on surface is reamed, and with cleaning surfacesization, carries out Solid-phase welding in the tissue of this cleaning.And, be pressed into finish after, recover the hardness of the mother metal at junction surface by cooling, engage securely.
Fig. 2 be expression as second material use chromemolybdenum steel (for example, SCM415) be pressed into connected structure.This is that the axis body 28 as the solid or hollow of the circle of second member is pressed into the structure that joins to as in the hole portion 27 of the cylindrical shell 26 of the circle of first member, and the material of each member all is above-mentioned SCM415.In addition, why using chromemolybdenum steel, is because this material is used for the container, pipe of requirement compressive strength etc., attempts to study for pressure-resistant material.For this joint that is pressed into, making the diameter of above-mentioned hole portion 27 is 12.0mm, is pressed into surplus (d) and is 0.2mm, and in addition, making compression distance (h) is 2.1mm.Utilize the joint that is pressed into of this second material, also similarly carry out, between the junction surface of the axis body 28 of the cylindrical shell 26 of first member and second member, form the joint interface of Solid-phase welding with the situation of above-mentioned first kind of material.
And, utilizing being pressed in the joint of above-mentioned any material, all pass through pressurizeing → switch on → be pressed into → air cooling process of (chilling).Like this, after being pressed into, if air cooling intactly cools off hastily by electrode made of copper.Therefore, carrying out under the good situation that is pressed into joint of hardenability, at the junction surface, the material of quenching becomes fragile.Reason as this quenching is, because heat partly and sharp above-mentioned being pressed in the joint, so, it is big that the thermograde of junction surface and disengaged portion becomes, for the above junction surface of the transformation temperature that is heated to steel (A3), stop heating, simultaneously, make it chilling, change over martensitic tissue.This martensitic stucture with increasing of the carbon equivalent of material with being in proportion.
In addition, the above-mentioned bonding method that is pressed into is that a kind of making by resistive heating is pressed into member and is pressed into the member thermoplastic, is pressed into the solid phase bonding method that engages by being pressed into member.Therefore, joint interface is thinned pull and stretch processing, and the oxide film at junction surface is excluded, and does not have oxide film.In addition, be pressed in the joint this, by the attenuate deep-drawing technique, produce big viscous deformation at the junction surface, become near the worked structure that viscous deformation also takes place of organizing the junction surface, still, because can be high to making material fused degree by the temperature rising that the resistance that bonding method gave according to this form of implementation causes, so this not organizing can return to recrystallized structure, but left behind.
Therefore, as following operation, in this form of implementation, the above-mentioned member that is pressed into bonding method is carried out in taking-up, in other operation, apply the energy that causes by thermal treatment at the junction surface, attempt near the diffusion of the material bonding wire (joint interface) and carry out with which kind of degree.These thermal treatments are after being pressed into joint mutually with member, by appending the thermal treatment process of utilizing common process furnace (perhaps continuous oven) to carry out.
Here, for adopt by the test A in the company above-mentioned first kind of material (stainless steel of austenite (SUS304) be pressed into bonded structure and by company in test B adopt second kind of material (bonded structure that is pressed into of chromemolybdenum steel (SCM415) carry out the annealed structure with defined terms, describes.
In above-mentioned company, test among the A (SUS304), in process furnace, divide the thermal treatment of annealing of two types thermal treatment temp.In this company, in the test (i) of test A, under the condition of 900 ℃ of temperature, carry out one hour annealing thermal treatment, in another one test (ii), under the condition of 1000 ℃ of temperature, carry out one hour annealing thermal treatment.After the heating of being undertaken by the thermal treatment here, cool off by air cooling.
Fig. 3 (a) is the diagram that is illustrated in the annealing thermal treatment metalloscope photo that is pressed into junction surface 29 afterwards of testing (i) (b).This figure (a) is the photo during with the low range tissues observed, and this figure (b) is the photo during with the high magnification tissues observed.Here, for test (i), as shown in photo, the above-below direction of central authorities residual the vestige of tissue at junction surface.Fig. 4 (a) is the diagram that is illustrated in the annealing thermal treatment metalloscope photo of testing (ii) that is pressed into junction surface 29 afterwards (b).This figure (a) is the photo during with the low range tissues observed, and (b) of this figure is the photo during with the high magnification tissues observed.For this test (ii), shown in the figure photo, the tissue at junction surface disappears, and forms same recrystallization texture.
Usually, the situation of austenite stainless steel (SUS304), different because of other the containing ratio of alloying element, still, usually, more than 8%, form the austenite individual layer at Ni content, can Yin Wendu and change.Therefore, this material carries out the sosoloid processing mostly about 1100 ℃.If apply plastic working, anneal, then carry out recrystallize with the low temperature lower than these temperature for this material.
According to this principle, in this form of implementation, in above-mentioned test (ii), heat-treat to approach 1000 ℃ of recrystallization temperature.Consequently, as above-mentioned shown in Figure 4, can confirm that near the material the bonding wire is spread, metal structure is integrated or homogenizing on Metallkunde.In addition, shown in figure test (i), remain in heating under 900 ℃ the situation, it is integrated that metal structure can not reach.Therefore, we can say, for the stainless steel of austenite or the tissue that is pressed into joint in the unoxidizable alloy steel, by keep more than one hour the integrated or homogenizing of the metal structure at junction surface with the heating of the temperature more than the recrystallization temperature.In addition, for above-mentioned any material, heat treated heat-up time below one hour and 3 hours with interior be suitable.
Among the test B (SCM415) in above-mentioned company, in process furnace, divide the thermal treatment of annealing of two types thermal treatment temp.In the said firm in the test (iii) of test B, be under 600 ℃ the condition, to carry out one hour annealing thermal treatment in temperature, in another one test (iv), under the condition of 700 ℃ of temperature, carry out one hour annealing thermal treatment.The thermal treatment here is high temperature annealing.In addition, in this thermal treatment, after heating, cool off by in stove, placing naturally.
Fig. 5 (a) is the diagram that is illustrated in the annealing thermal treatment metalloscope photo of testing (iii) that is pressed into junction surface 25 afterwards (b).(a) of this figure is the photo of observing whole junction surface with low range, and this figure (b) is a photo of observing the microstructure at junction surface with high magnification.Here, for test (iii), shown in photo, the above-below direction of central authorities residual the vestige of tissue at junction surface.
Fig. 6 (a) is the diagram that is illustrated in the annealing thermal treatment metalloscope photo of testing (iv) that is pressed into junction surface 25 afterwards (b), and (a) of this figure is the photo with the low range tissues observed, and this figure (b) is the photo with the high magnification tissues observed.For this test (ii), shown in photo, the vestige of the tissue at junction surface disappears basically, forms same recrystallization texture.
Usually, (comprise chromemolybdenum steel (SCM415), as shown in Figure 7, the temperature of A1 transformation temperature is about about 700 ℃ at steel.Therefore, as above-mentioned test (iv),, can confirm to heat under the situation of maintenance as near 700 ℃ of the temperature the A1 transformation temperature, near the diffuse the bonding wire, metal structure is integrated or homogenizing on Metallkunde.In addition, as test (iii), heating under the situation of maintenance to hang down about 100 ℃ temperature (600 ℃) than A1 transformation temperature, it is integrated that metal structure can not reach.
Therefore, we can say, for the tissue that is pressed into joint of chromemolybdenum steel, by keep more than one hour the integrated or homogenizing of the metal structure at junction surface in the heating of the temperature more than the A1 transformation temperature.In addition,, do not process the new crystallization crystal grain of strained owing to generate even more than recrystallization temperature, so, can think that above-mentioned thermal treatment by heat maintenance more than recrystallization temperature, can make the metal structure at junction surface integrated well.In addition, carry out the above-mentioned situation that is pressed into joint, also can expect,, can make the metal structure at junction surface integrated by more than recrystallization temperature, carrying out above-mentioned thermal treatment for metallic substance with other.In addition, the processing stage of metal structure is big more, and then the recrystallize degree is low more.
Can confirm by the test in the above-mentioned company,,, can make the integrated or homogenizing of metal structure fully than the low temperature of general diffusion annealing temperature (more than about 1150 ℃) according to the annealing temperature of this form of implementation.Like this, according to above-mentioned form of implementation, owing to carry out fine annealing by the thermal treatment of low temperature, so, can prevent thickization of the metallic crystal of the mother metal portion outside the junction surface.Therefore, in thermal treatment, have and to prevent because excellent effects such as the reduction of the strength of materials that thickization of metallic crystal causes, flexible reductions according to this form of implementation.In above-mentioned heat treated temperature is under the situation of diffusion annealing temperature condition, also carries out recrystallize outside weld part, and it is big that the crystalline particle diameter becomes, and toughness reduces.
Thereby the thermal treatment according to being pressed into of above-mentioned form of implementation engages and annealing causes can make the integrated or homogenizing of metal structure in the junction surface, carries out fine annealing, can obtain colory connected structures such as erosion resistance, resistance to pressure.In addition, in this form of implementation, the metal structure that the utilization annealing of seeking can not to adopt is in the prior art carried out integrated, this is the feature according to the excellence of the heat treatment technics of this form of implementation.
In addition, owing to, can promptly engage by the above-mentioned joint that is pressed into, be easy to make, cheap for manufacturing cost, economy is excellent, in addition, can engage well, excellent strength, and the welding with solid state shape engages, so the heat affecting scope that gives mother metal is little, therefore, can obtain to guarantee effect such as high-precision joint, precision work precision be good.In addition, have the toughness that to guarantee the junction surface, the effect of carrying out the joint of superior quality.
In addition, for above-mentioned first member that in above-mentioned form of implementation, uses and the shape or the material of second member, also can use shape, material except that above-mentioned.Shape for the hole portion of first member, also can use the shape except that circle, in this case, if the profile of this hole portion and second member is a similar shape, then guaranteed the appropriate surplus that is pressed between the two, carry out engaging with above-mentioned same being pressed into and annealing, can expect and above-mentioned same effect.In addition, as the material of each member, can use general processing with steel, automobile with the combination of high tensile steel, other metallic substance, SUS (stainless steel), SUS and carbon steel, physical construction with carbon steel, physical construction with steel alloy, high temperature steel, tool steel, spring steel, cast iron, easily light metal, light metal alloys etc. such as ferrous materials such as machining steel, structural steel, steel pipe, wire rod, bearing steel, general processing steel, steels for pressure vessel use material, titanium, aluminium, magnesium.
Secondly, describe for second kind of form of implementation.In this form of implementation, use chromemolybdenum steel (SCM420) as the third material, usefulness and above-mentioned same technology are pressed into joint, and then, carry out carburizing treatment as thermal treatment.Adopting the connected structure that is pressed into of this third material, as shown in Figure 2, is that the axis body as the circular solids of second member or hollow is pressed in the hole portion that joins to as the circular cylinder body of first member.In addition, as the third material, why using SCM420, is because be suitable for the carburizing treatment that is pressed into behind the joint.
Because this bonding method that is pressed into is to be pressed into member and to be pressed into the solid phase bonding method that engages be heated remollescent by resistive heating, so, attenuate pull and stretch by joint interface, big viscous deformation takes place at the junction surface, organizes the worked structure that also becomes viscous deformation near the junction surface.In this bonding method, the temperature that Qu Yu causes by resistive heating rises little, so above-mentioned not organizing can return in recrystallized structure, and be left behind.
Like this, from the above-mentioned feature that engages the making method of carrying out that is pressed into, when consider on joint interface, can not involve oxide film and as mother metal do not comprise composition, when organizing dissimilar weld metal etc., because above-mentioned junction surface has very the character near mother metal, so, have excellent quality.Therefore, when carburizing treatment,, do not prevent the necessity that carbon is handled, on the contrary, handle if can eliminate anti-carbon utilizing in the above-mentioned portion that is bonded with each other that is pressed into the member that bonding method carries out, then can simplified manufacturing technique.Therefore, in the thermal treatment here, do not do the carburizing treatment that anti-carbon is handled.
And, for carrying out the above-mentioned connected structure member that is pressed into joint, as thermal treatment.Carry out carburizing treatment, near the diffusion of the material the observation bonding wire (joint interface) etc. proceeds to any degree, and the effect of the carburizing treatment on the junction surface.In this carburizing treatment technology, after member is pressed into joint each other, does not carry out the anti-carbon at junction surface and handle, utilize the intermittent type cementing furnace, implement the gas cementation that is converted and carries out by butane.
In this gas cementation is handled, above-mentioned connected structure member 930 ℃ of carburizings of temperature 3 hours, then, is dropped to 840 ℃ with temperature, carry out 0.5 hour DIFFUSION TREATMENT, and then, by oil cooling, be cooled to 150 ℃.In addition, when further applying nitrogenation treatment technology, be effective for the mechanical propertiess such as wearability that improve the connected structure member.As other cementing process, the method that adopts pit-type carburizing furnace, the method for carburizing that utilizes the continous way gas carbruizing furance are arranged.In addition,, except the above-mentioned gas carburizing, also have various method for carburizing such as vacuum carburization, can utilize any method for carburizing for carburizing treatment.
Fig. 8 is illustrated in the above-mentioned diagram that is pressed into the metalloscope photo of joint and carburizing treatment connected structure member afterwards.Shown in this photo, the connected structure member, its upper layer hardens by carburizing and quenching, and inner former state keeps the softish tissue, and in addition, the metal structure at junction surface is homogenized.Carburized depth in this carburizing treatment is about 0.5mm.
In addition, form roughly cementation zone uniformly, for the junction surface, also form same uniform cementation zone, the carburized depth of the part same degree of acquisition and mother metal on the whole surface of above-mentioned connected structure member.Can confirm, at the junction surface of above-mentioned connected structure member, by the heating of carburizing treatment, near the diffuse the bonding wire, metal structure on Metallkunde by integrated or homogenizing.In addition, this connected structure member, because the material composition of junction surface and mother metal is identical, so, the part outside junction surface and this junction surface firmly also constant.
As material according to the connected structure member of this form of implementation, soft steel that processibility is good or low-carbon alloy steel are suitable, can use general processing and use steel (S15C), titanium etc. with the combination of steel, other metallic substance, SUS (stainless steel), SUS and carbon steel, carbon steel (SCM, SCR), the physical construction that physical construction is used with ferrous materials such as steel alloy, structural steel, steel pipe, wire rod, general processing.
Thereby, according to the passing through to be pressed into and engage and thermal treatment that carburizing is carried out of above-mentioned form of implementation, because the upper layer of connected structure member obtains and the equal cementation zone of mother metal, so, do as a whole, tenacity excellent, intensity improve, simultaneously, and when carrying out carburizing treatment, there is no need to implement anti-carbon handles, therefore, can save manufacturing process, help to reduce cost.
Claims (11)
1. heat treating method that is pressed in the joint, it is characterized in that, pressure with regulation is pressed to second member in the hole portion of first member, simultaneously, switches between these two members, make the heat that has a resistance at both junction surfaces, above-mentioned second member is pressed in the portion of above-mentioned hole, makes to form joint interface with the facial place that engages of the inwall face of above-mentioned hole portion at above-mentioned second member, and, carry out the be pressed into joint of this joint as the joint of solid state shape
Heating keeps engaging the junction surface that forms by above-mentioned being pressed into, and anneals, and by this thermal treatment, disperses, eliminates the junction surface, makes by above-mentioned and is pressed into joint and the integrated or homogenizing of metal structure in the junction surface of articulate two engagement members.
2. the heat treating method that is pressed in the joint as claimed in claim 1 is characterized in that, above-mentioned first member and second member are the materials of identical material.
3. as claim 1 or the described heat treating method that is pressed in the joint of claim 2, it is characterized in that above-mentioned heat treated temperature is more than recrystallization temperature.
4. the heat treating method that is pressed in the joint as claimed in claim 2, it is characterized in that, use as above-mentioned materials have the carbon steel of ferritic structure, when having the steel alloy of austenite structure or having the steel alloy of ferritic structure, above-mentioned heat treated temperature is more than the A1 transformation temperature or more than the recrystallization temperature.
5. as claim 1 any one described heat treating method that is pressed in the joint to the claim 4, it is characterized in that the time that above-mentioned heating keeps is more than one hour.
6. as claim 1 any one described heat treating method that is pressed in the joint to the claim 5, it is characterized in that above-mentioned heat treated temperature is below the temperature of diffusion annealing.
7. a connected structure that is pressed in the joint is characterized in that, described connected structure is by utilizing claim 1 any one described heat treating method that is pressed in the joint engages to the claim 6 above-mentioned first member and second member to constitute.
8. heat treating method that is pressed in the joint, it is characterized in that, pressure with regulation is pressed to second member in the hole portion of first member, simultaneously, switches between these two members, make the heat that has a resistance at both junction surfaces, above-mentioned second member is pressed in the portion of above-mentioned hole, makes to form joint interface with the facial place that engages of the inwall face of above-mentioned hole portion at above-mentioned second member, and, carry out the be pressed into joint of this joint as the joint of solid state shape
Heating keeps above-mentioned first member and second member that is pressed into joint, carry out carburizing, make the upper layer quench hardening of two members by this thermal treatment, and make by above-mentioned being pressed into and engage and the integrated or homogenizing of metal structure in the junction surface of articulate two members.
9. the heat treating method that is pressed in the joint as claimed in claim 8 is characterized in that, the carbon processing is not prevented at the junction surface of above-mentioned first member and second member, by above-mentioned carburizing, makes the upper layer quench hardening of two members that comprise above-mentioned junction surface.
10. as claim 8 or the described heat treating method that is pressed in the joint of claim 9, it is characterized in that, as the material of above-mentioned first member and second member, use general processing with steel, stainless steel, physical construction with carbon steel, physical construction with steel alloy or titanium.
11. a connected structure that is pressed in the joint is characterized in that, described connected structure is by utilizing claim 8 any one described heat treating method that is pressed in the joint engages to the claim 10 above-mentioned first member and second member to constitute.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004274144 | 2004-09-21 | ||
| JP274144/2004 | 2004-09-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101103128A true CN101103128A (en) | 2008-01-09 |
Family
ID=36090075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200580031823XA Pending CN101103128A (en) | 2004-09-21 | 2005-09-20 | Heat treatment method in press-fit connection and connection structure by the press-fit connection |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5033423B2 (en) |
| KR (1) | KR101254348B1 (en) |
| CN (1) | CN101103128A (en) |
| WO (1) | WO2006033316A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269823A (en) * | 2010-08-27 | 2013-08-28 | 株式会社F.C.C. | Integrated member and manufacturing method therefor |
| CN112621169A (en) * | 2016-10-18 | 2021-04-09 | 株式会社F.C.C. | Method for manufacturing joint component |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9044831B2 (en) | 2010-08-24 | 2015-06-02 | Ohashi Technica, Inc. | Method of joining part having high fatigue strength |
| JP5763181B2 (en) * | 2011-04-28 | 2015-08-12 | 株式会社オーハシテクニカ | Manufacturing method of steel product having fine ferrite grain boundary precipitation type martensite structure |
| FR2980804B1 (en) | 2011-09-30 | 2014-06-27 | Areva Np | PROCESS FOR MAKING A LOW CARBON AUSTENITIC STAINLESS STEEL MIXTURE OF A WEAR AND CORROSION RESISTANT SHEATH FOR CORRESPONDING NUCLEAR REACTOR, SHEATH AND CLUSTER |
| JP5763036B2 (en) * | 2012-10-24 | 2015-08-12 | 株式会社オーハシテクニカ | Manufacturing method of steel product having fine ferrite grain boundary precipitation type martensite structure |
| JP6175101B2 (en) * | 2015-06-10 | 2017-08-02 | 株式会社オーハシテクニカ | Steel products with fine ferrite grain boundary precipitation type martensite structure |
| JP6200609B1 (en) * | 2017-02-14 | 2017-09-20 | 株式会社エフ・シー・シー | Manufacturing method of joint parts |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6363584A (en) * | 1986-09-02 | 1988-03-19 | Nippon Steel Corp | Solid phase joining method for metal |
| JPH0510320A (en) * | 1991-07-03 | 1993-01-19 | Hino Motors Ltd | Main shaft of transmission and manufacture thereof |
| KR100224635B1 (en) * | 1995-12-26 | 1999-10-15 | 이구택 | Slag deoxidation material for high purity steel making |
| JP3270758B2 (en) * | 2000-06-12 | 2002-04-02 | 株式会社オーハシテクニカ | Press-fit joint between shaft and plate |
-
2005
- 2005-09-20 KR KR1020067012226A patent/KR101254348B1/en not_active IP Right Cessation
- 2005-09-20 CN CNA200580031823XA patent/CN101103128A/en active Pending
- 2005-09-20 JP JP2006536374A patent/JP5033423B2/en active Active
- 2005-09-20 WO PCT/JP2005/017267 patent/WO2006033316A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269823A (en) * | 2010-08-27 | 2013-08-28 | 株式会社F.C.C. | Integrated member and manufacturing method therefor |
| CN103269823B (en) * | 2010-08-27 | 2015-10-07 | 株式会社F.C.C. | Unitary member and manufacture method thereof |
| CN112621169A (en) * | 2016-10-18 | 2021-04-09 | 株式会社F.C.C. | Method for manufacturing joint component |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006033316A1 (en) | 2006-03-30 |
| JPWO2006033316A1 (en) | 2008-07-31 |
| KR101254348B1 (en) | 2013-04-12 |
| JP5033423B2 (en) | 2012-09-26 |
| KR20070057067A (en) | 2007-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101103128A (en) | Heat treatment method in press-fit connection and connection structure by the press-fit connection | |
| CN107810281B (en) | For suppressing the steel of hardening and the component of the compacting hardening by such steel making | |
| CA2695472C (en) | Secondary-hardening gear steel | |
| JP5099865B2 (en) | Method for producing maraging steel product and steel product obtained by this production method | |
| CN101798667B (en) | Hardened titanium structure for transmission gear applications | |
| JP2011518669A (en) | A method for optimizing the microstructure of automotive components. | |
| Bergmann | Current status of laser surface melting of cast iron | |
| US20080203139A1 (en) | Method for controlling weld metal microstructure using localized controlled cooling of seam-welded joints | |
| JP2003507576A5 (en) | ||
| US7926180B2 (en) | Method for manufacturing gas and liquid storage tanks | |
| AU2014362928A1 (en) | Multi-track laser surface hardening of low carbon cold rolled closely annealed (CRCA) grades of steels | |
| CN106399834A (en) | Hot stamping steel and producing method thereof | |
| CA2404361C (en) | Procedure for the production of thin-walled parts made of steel and parts produced after this procedure | |
| Kellogg et al. | Physical simulations of heat-affected zone microstructures to compare weldability characteristics of additively manufactured and wrought 17-4 stainless steel | |
| Bartkowska et al. | The influence of the laser beam fluence on change in microstructure, microhardness and phase composition of FeB-Fe2B surface layers produced on Vanadis-6 steel | |
| Mitelea et al. | Enhancement of cavitation erosion resistance of cast iron with TIG remelted surface | |
| Strobl et al. | New steel combinations produced by the Damascus technique | |
| Dossett | Introduction to cast iron heat treatment | |
| Harnett et al. | Comparing the surface hardness of mild steel processed with CO₂ and fibre lasers | |
| Kumar et al. | Comparative study on tempering response of martensitic grade AISI-420 stainless steels with varying carbon content | |
| Bergmann | Heat Treatment | |
| Bergmann et al. | Industrial applications of surface treatments with high power lasers | |
| Edan | Simulation Study of Carbon Steel Phase Transformation using Nd: YAG laser Pulse | |
| Niaz et al. | Investigation of Enhancing Temper Resistance and Hot Hardness for Tool Steel | |
| Schlegel | Heat Treatment of Steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |