CN1769723A - Prestress fitting connection method - Google Patents
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- CN1769723A CN1769723A CN 200510098584 CN200510098584A CN1769723A CN 1769723 A CN1769723 A CN 1769723A CN 200510098584 CN200510098584 CN 200510098584 CN 200510098584 A CN200510098584 A CN 200510098584A CN 1769723 A CN1769723 A CN 1769723A
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Abstract
The invention discloses a prestressed tabling connection method, which comprises the following steps: subdiving the whole component into the small dimension, weight elements; manufacturing the element; disposing the connection boundary; forcing pretightening load on the element to form the prestressed field. The positive pressure and friction is formed on the connection boundary through the action of prestressed field, which prevents the connection boundary from separating or offsetting. The invention can be used in the important part of heavy-duty machine.
Description
Technical field
The present invention relates to have the special connecting means of the mechanical parts of prestressed structure, belong to structural design, processing and the manufacturing technology field of heavy equipment, heavy-duty machine.
Background technique
China is that the world makes big country, but also not to make power, restriction China develops into one of reason of making power and just is the still core key components and parts of dependence on import, particularly heavy equipment of many great equipments that relate to great national economy and national defense safety, and the localization rate of parts and components is very low.
Its manufacture difficulty of key component in the heavy equipment mainly is oversize, preponderance, and the promptly so-called overweight and problem that transfinites causes.The heavy duty metal part that has, weight can reach hundreds of tons, and volume can reach tens of cubic metres metalwork, and the difficulty of its manufacturing has also just determined feasibility and the degree of difficulty that the heavy-duty machine equipment is made.As the runner and the blade of large-scale water turbine, the frame of heavy rolling mill and hydraulic press, heavy high-pressure reaction vessel, the heavy pipe fitting of nuclear pressure shell and ultra supercritical thermoelectricity etc.The empirical evidence that numerous items is implemented, the consolidation of Economic Growth in China speed and national defense construction are relevant with the development level of the high efficiency manufacturing technology of these heavy-duty machine metal partss invariably.
For manufacturing, the processing of finishing the heavy part in the heavy equipment, generally adopt three kinds of strategic management of technology to solve the difficulty of manufacturing on the engineering at present.
Adopt large-scale smelting, casting and forging equipment and improve lifting and transport capacity, finish the whole manufacturing of heavy parts.As the heavy mill housing that this century, China No. 2 Heavy Machinery Factory made for the Shanghai Baosteel, net weight 450t, foundry goods 550t needs molten steel 700t.Owing to lack experience, the casting back has a strong impact on heavy heavy plate mill manufacturing because serious quality problems do not go out factory half a year.Adopt the super sized type process equipment, the whole heavy parts of making is invested hugely, and the cycle is long.
Heavy part is split into small piece, welding and form big part.As first 1.2 ton water hydraulic press that China in 1958 begins to make, owing to there is not heavy rolling and forging equipment, its 4 about 1m of diameter, the column that is about 20 meters were formed by the cylindrical body forging electro-slag welding of lacking at that time.Quality control requirement is very strict, and weld seam and heat affected zone problem are more, and the treating process complexity that eliminates stress causes cost height, cycle long.
Heavy part is split into the small piece mechanical connection forms big part.Cause stress and concentrate at the mechanical connection place, has reduced allowable stress.In mechanical connection, use plane mechanical connection the most generally, form varied (shown in Fig. 1 a, b, c, d, e).With above three kinds of processing that method solves big part, the problem of existence is clearly, as: the ability that continues raising smelting, casting, forging is invested, many effects limit of time; Limit much on the welding technique of large-scale (big section) part, the reliability of mechanical connection, the problem of fatigue life is also a lot.
Mechanical connection was continued to use hundreds of years, and the principle that it connects is with two key elements separately, was guaranteed by bolt anti-the separation, hold and cut by shearing resistance part (key, boss, pin, cross key) guarantees (template bolt had both produced positive pressure, and the shear resistance of pin is arranged again, generally only used) in the light-duty connection of non-heavy type.As long as manage to increase friction progression, positive pressure just can produce two mechanics effects on junction surface but in fact: prevent from separately to prevent the changing of the relative positions (dependence frictional force) simultaneously.So just can being unified with two key element natures by enough big positive pressure and friction factor.
Summary of the invention
The purpose of this invention is to provide a kind of prestress fitting connection method, purport is for solving the problem that is difficult to whole processing, transportation and lifting of medium and heavy of heavy equipment.This is a kind of special connecting means, and under the effect of prestressing force heavy type structure prestressing force field, the synergy of positive pressure and frictional force by linkage interface reaches the firm connection of linkage interface.
Technological scheme of the present invention is as follows:
The method that a kind of prestress fitting connects is characterized in that this method carries out as follows:
A, bank close determining of face:
Under the condition of determining integral mechanical structure and design of part, at first the overall structure of subdivision is not carried out stress-strain analysis according to its stressing conditions; When on needing the part of subdivision, selecting the pretension state those based on pressure stress, numerical value big and when work loads the little section of pressure stress fluctuation close face as bank, closing on the face the part subdivision at bank is that several sizes and weight are less than this part and be easy to the component processing, transport and lift;
Determining of b, prefastening load:
Earlier default bank closes the friction factor of face, adjusts the prefastening load value that is applied on the component connecting body again, calculates bank by the numerical analysis method and closes σ and τ on the face, judges whether it satisfies and do not have the dislocation-free of separation criterion:
μ ∫ σ d σ df＞∫ τ d τ df and σ＞0 (I)
Wherein: f is that bank closes the face area
μ is that bank closes the face friction factor
σ is a direct stress
τ is a shearing stress
When do not have separating the offsetting criterion when satisfying, then the size of this value and be distributed as definite prefastening load is calculated otherwise need readjust the prefastening load value, does not have the dislocation-free of separation criterion up to satisfying, and forms firm nothing separation offsetting connection; Described component connecting body is a plurality ofly to be closed face by the component of subdivision through bank and be connected to each other together overall structure;
C, bank close face and handle:
To the compounding that bank closes the processing of face adhesion, roughening processing or adhesion and roughening, the friction factor that makes bank close face reaches default value among the step b;
D, pre-stressed joint: with the prefastening load of determining among the b surface treated component in the c step is carried out pretension, form the machine parts of an integral body.
Firmly beforehand means of the present invention can adopt the method for the winding of reinforcement wire winding layer, pretension bolt pretension or interference assembling.
Adhesion processing of the present invention is to close face folder at bank to add good sheet metal of stickability or non-metal board, its thickness 0.1～10mm, and the surface texturing that sheet metal or non-metal board are intended to improve adhesiveness handled; Or close at bank and to carry out plasma spraying, thermal spraying, electric arc spraying on the face or to electroplate the good metal layer of adhesiveness, its thickness is 0.1～1mm.
Roughening described in the present invention is handled and is comprised:
1), shot-peening, sandblast;
2) laser roughening method is closed the surface gasification of ablating with laser to bank, and the formation degree of depth is 0.01～0.5mm, and diameter is the texturing point of 0.05-0.2mm;
3) cutting method, closing the surface with cutter at bank, to depict the degree of depth be 0.1-0.5mm, width is the decorative pattern of 0.1-0.5mm;
4) roller flower method, closing surface roll with the roller cutter at bank, to extrude out the degree of depth be 0.1-0.5mm, width is the decorative pattern of 0.1-0.5mm;
5) close the surface with grinding tool polishing bank.
The present invention compared with prior art has following advantage and high-lighting effect: 1. with heavy part subdivision for several sizes and weight much smaller than original structure and be easy to the component (optimal design process) processing, transport and lift, manufacturing component respectively; 2. metallurgical connections such as welding are not taked in the connection of component, do not take traditional mechanical connection yet, connect but be used in the enough big frictional force that produces under the suitable prestressing force, can guarantee to have between component good anti-separation and anti-offsetting characteristic; 3. eliminate the area of stress concentration of linkage interface fully, can improve the intensity and the reliability of structure greatly; 4. need not welding, no weld seam heat affected zone, the heat treatment step that need not to eliminate stress; 5. this method operation and simple to operate, processing cost is low, adopts this connection component can be pieced together reliably large-scale heavy part, solves the overweight difficult problem that transfinites of key component manufacturing.It can play a significant role at the crucial manufacture view of heavy-duty machine as a kind of connection technological method of novel pre-stressed structure.
Description of drawings
Fig. 1 (a, b, c, d, e) is a traditional mechanical Placement schematic representation.
Fig. 2 a is a semicircle beam stress analysis chart, and Fig. 2 b is a semicircle beam subdivision schematic representation.
Fig. 3 a is a high-pressure reactor subdivision schematic representation.
Fig. 3 b is the situation of high-pressure reactor steel wire floor pretension.
Fig. 4 a is that bank closes the face connection diagram.
Fig. 4 b closes the local structure for amplifying schematic representation that face connects for bank among Fig. 4 a.
Fig. 5 a is 3.5 ten thousand t hydraulic press semicircle beam frame (no bank closes design) schematic representation.
Fig. 5 b is semicircle beam design (arched girder structure) schematic representation that 3.5 ten thousand t hydraulic press banks close connection.
Fig. 6 is the experimental machine schematic representation that 200 tons of banks close connection.
Embodiment
Prestress fitting connects mechanism:
The present invention proposes a kind of new Placement---and prestress fitting connects, it is a kind of big section in the prestressed structure that is suitable for that bank closes connection, the inorganization of extra-large cross-section changes, no tensile stress is concentrated, no heat affected zone, zero defect and do not have distortion, be suitable for the Placement of any material, be particularly suited for large-scale heavy part.Connect for prestress fitting, it connects key element and is: Kan Hemian is not separated, promptly requires enough positive pressure of closing face perpendicular to bank to close on the face at bank; Bank closes face the mutual changing of the relative positions or offsetting does not take place, and requires bank to close the ability that mask has enough anti-shearing forces.
The essence that bank closes connection is that bank closes the face both sides, in the scope of micro-scale, owing to the characteristic and the uneven bank mutually of the concave, convex of form on surface closes the resistance that forms---stiction, guarantee that contact surface all wrong merit can not take place under various load, link together securely.From the angle analysis of engineering practice, the factor that influences frictional force can reduce two aspects at last: material contact surface roughness is to the influence of friction factor, and the big more friction factor of surface roughness is big more, thereby frictional force is big more; The adhesive properties of material contact surface also influences friction factor.If bigger sticking effect takes place linkage interface, just can on surface of contact, produce very big frictional force.
The difference that assembling face and bank close face
Machine parts is assembled into parts and then is assembled into machine, and the interface of this assembling and assembling is not that the bank of indication of the present invention closes face.Bank closes face and is meant: for reducing and reduce processing, manufacturing and transport difficulty heavy, great part, and especially to being that whole structure subdivision is the designed subdivision interface of component originally.By applying special prefastening load and implementing special surface treatment, on the interconnective interface of component, cause and form positive pressure and the frictional force that reaches designing requirement, thereby guarantee component good anti-separation and anti-offsetting each other, reach and interconnect, finally obtain the heavy type structure part of complete integral body.
Below in conjunction with accompanying drawing concrete enforcement of the present invention is further described:
Bank closes determining of face
Under the condition of determining integral mechanical structure and design of part,, the overall structure of subdivision is not carried out stress-strain analysis by digital method and elastomechanics method at first according to its stressing conditions; When on needing the part of subdivision, selecting the pretension state those based on pressure stress, numerical value big and when work loads the little section of pressure stress fluctuation close face as bank, closing on the face the part subdivision at bank is that several sizes and weight are less than this part and be easy to the component processing, transport and lift;
Fig. 2 a is a semicircle beam stress analysis chart, and Fig. 2 b is a semicircle beam subdivision schematic representation.As a heavy beam, its weight can reach about 240t, shown in Fig. 2-a.Its circumferential surface bears normal load q, and normal load p is born in the bottom surface.Structural analysis shows, has very big pressure stress along (among Fig. 2-a, beating the zone of oblique line) in the circumference certain limit along its tangent direction; Near the central authorities of bottom surface, highly reach in 1/3 (zone of getting ready among Fig. 2-a) scope of deck-molding, have tensile stress.As being that (Fig. 2-b), this kind subdivision has almost completely been eliminated the tensile stress on the semicircle cushion block, and stressed on the arch form structure more becomes reasonable for semicircle cushion block and arch form structure two-part with the beam subdivision.As being three equal components further with the arch form structure subdivision, promptly form A1, A2, A3 and semicircle cushion block A4, promptly four components and two banks close the plane (k1, k2), a bank close curved surface (A4 and A1, A2, the surface of contact between the A3).Each structure weight all about the 60-75 ton, has reduced the difficulty of hot and cold processing greatly.
And for example non-circular (having perpendicular to a horizontal symmetry axis) high-pressure reactor shown in Fig. 3-a, is used k1, k2 ... it is A1 with its subdivision that seven banks of k8 close face, A2 ... A8 is totally 8 components.Adopt exterior normal load q that its pretension (compression) is formed an integral body.Q is non-uniform, and big in curvature very general goal q value, the curvature q of little place value is little.The steel wire that employing has certain tension force twines and forms steel wire floor 1 and can produce desired q value, to simple bank close structure also can adopt pretension bolt certainly or be press-fitted, hot charging forms the q value.Fig. 3-b is the situation of steel wire floor pretension.
Determining of prefastening load
Combine with prestressing technique, can guarantee that bank closes desired positive pressure on the interface, as shown in Figure 4, what bank closed contact surface that interface or component interface be meant adhesive layer and component 2 and component 2 contacts the table surface.Prefastening load q acts on bank and closes connect that both sides---on component 2 and the component 3, the stress field that prefastening load forms is called the prestressing force field in component.The stress of prestressing force field on linkage interface is direct stress σ and shearing τ, and these stress also act on the adhesion layer.To change after connecting body bears work loads, τ and σ can change, if but exist all the time
μ ∫ σ d σ df＞∫ τ d τ df separates the dislocation-free criterion with σ＞0 (I) nothing
Wherein: f is that bank closes the face area
μ is that bank closes the face friction factor
σ is a direct stress
τ is a shearing stress
Can guarantee that then bank closes the reliability and the soundness of connection.(I) formula is for do not have separating no offsetting criterion, the firm degree that material property, surface properties and the prestressing force field that bank closes the interface determined bank to close to be connected.
Prefastening load is to guarantee that bank closes the structural integrity of structure, and makes structure can bear the load of work loads.Q value among Fig. 2 and Fig. 3 is prefastening load, and the correct of it determined, becomes bank and closes one of important step of design.The q value is generally determined by the numerical analysis method: earlier default bank closes the friction factor of face, adjust again and be applied to the component connecting body (a plurality of components close face and are connected to each other together structure---component connecting body through bank, after it is applied suitable prefastening load, just form the heavy type structure part or weigh type spare or heavy-duty machine part) on prefastening load q value, calculate bank by the numerical analysis method and close σ and τ on the face, judge whether it satisfies nothing and separate the dislocation-free criterion, when nothing separation offsetting criterion satisfies, the size of this q value and be distributed as definite prefastening load then, otherwise need readjust the prefastening load value calculates, do not have the dislocation-free of separation criterion up to satisfying, form firm nothing separation offsetting and connect;
Bank closes face and handles
Bank close target that face handles be make bank close friction factor on the face meet or exceed previous step rapid in default friction co-efficient value.Determine that according to the value of required friction factor bank closes the surface treatment requirement of face.The fundamental method of surface treatment also is one of emphasis of the present invention closes the surface for bank adhesion processing.From the engineering application point of view, the practical method that the increase bank closes the last friction factor of face (particularly the bank that area is very big closes face) is the adhesion processing---it is big that folder adds one deck viscosity, the material that intensity is high, as titanium alloy sheet, form adhesive layer (shown in k layer among Fig. 4), the compounding of roughening processing or adhesion and roughening.The concrete technical measures chain that increases friction factor is as follows:
(1) increase the adhesiveness that bank closes face:
(i), close the face folder at bank and add titanium or titanium alloy sheet, thickness 0.1～10mm
(ii) close the face folder and add aluminum or aluminum alloy plate, thickness 0.1～10mm at bank
(iii) close the face folder and add reasonable sheet metal of other stickability and non-metal board at bank
(iv) the various machineries of roughness are intended to increase in sheet metal that adds at above-mentioned various folders and non-metal board surface, chemistry, electrochemical, or various comprehensive processing;
(v) close and carry out plasma spraying on the face at bank, thermal spraying, electric arc spraying etc. or the good metal layer of plating adhesiveness,
(as titanium, aluminium, alloys such as magnesium) its thickness is 0.1～1mm
(vi), closing face adhesion layer and bank at bank closes and sprays non-metallic binder on the face
(2) increase the roughness that bank closes face
(i), shot-peening, sandblast (shot is the cylinder of Φ 1mm * 2mm or the sand grains of Φ 0.5～Φ 1mm).
(ii), the laser roughening method, with laser bank is closed the surface gasification of ablating, (0.01～0.5mm is dark, and Φ 0.05～0.2mm), to increase friction factor to form the texturing point
(iii), cutting method, connecting the decorative pattern (0.1～0.5mm is dark, and 0.1～0.5mm is wide) that the surface depicts increases friction factor with cutter
(iv), roller flower method, extrude decorative pattern (the same cutting method of size) with the roller cutter connecting surface roll
(v), close the surface with grinding tool polishing bank
(3), compound measure
The compounding of adhesion and roughening.
Ten thousand tons of stamp forging hydraulic press shelf design of embodiment 1:3.5
This press is the single cylinder ultrahigh pressure press of press power maximum in the world.Single clutch release slave cylinder, the press power of generation 350MN is suitable for the turbine disk and all kinds of disk-shaped part and die forgings such as various refractory alloys, titanium alloy.This machine adopts the prestressing force winding structure, is not adopting bank to close in the conventional design of method, each heavy 240t (shown in Fig. 5-a) of the upper and lower semicircle beam of frame; After the utilization bank closed principle and method, the bank that can draw 3 suitable subdivisions shown in Fig. 5 b by numeral and mechanical analysis result closed face, and closing face by bank can be divided into the semicircle beam four, forms an integral body with pretension steel wire floor 5 pretensions.K1 wherein, K2, K3, K4 closes face (shown in Fig. 5-b) for the plane bank, and A1 and A2 are that cylindrical bank closes face, and each semicircle beam is divided into 4, and every heavily is 60 tons.Reduced the difficulty in smelting, casting, forging like this, heavy part manufacturability is improved greatly.
Embodiment 2:200t bank closes the frame experiment
Be the feasibility that checking prestress fitting principle and technology realize, the reinforcement wire that has designed bearing capacity and be 200t twines bank and closes the experiment frame.
Test frame as shown in Figure 6: arch beam is split into three bank zygote spares.Last underbeam adds up to 4 banks and closes face, i.e. A
1, A
2, A
3, A
4, 6 banks close structure.Column is that hollow structure, arch beam cross section are Filled Rectangle (size is seen Fig. 6).Loader is the oil cylinder of Φ 190mm, and working inner pressure is 120MPa, so the maximum load tonnage is:
The interior pressure when being 70MPa produces the 198t loading force, is 255t during 90MPa.The load cylinder external diameter is slightly less than Φ 280mm, just in time can insert in the frame.Adjust the position (about or front and back skew, realize center loaded and eccentric the loading) of cushion block.
Experiment is divided into pretension experiment and work loads experiment, and pretension is tested to be wrapped on the frame external frame with steel wire, and the tension force of steel wire floor tightly forms whole frame with beam, tie, and be the pretension state this moment, investigates the offsetting situation that the A bank closes face.Loader adds center and eccentric work loads by backing plate, investigates the A bank again and closes face offsetting situation.
Experimental result:
Experiment for the first time: bank is closed face both sides car become concentric circles, its degree of depth and width are 0.5mm, carry out bank and close connection under the situation that does not add any adhesion layer.Pretightening force is 215.7 tons, and all banks close face behind the pretension does not all have offsetting or separation.Add centre-line load then, when voltage rise in the loader during to 70MPa (198t), at A
1Bank closes face (Fig. 5), on the solid-state lacquer painting that surface paint forms, produces the through check of the face that closes along bank.Other A
2, A
3, A
4It is not obvious that three banks close on the face crackle,, load altogether 3 times.After center load was increased to 90MPa (255t) and 120MPa (340t), category-A lacquer painting crackle was the same, B
1, B
2, B
3And B
4Lacquer painting also produce through check.Eccentric load loads backing plate 20mm by skew and realizes.Eccentric load directly is added to 340t, the concentricity load of crack growth situation.
Experiment for the second time: two banks are closed the face car become concentric circles, its degree of depth and width are 0.5mm, and pad adds the titanium plate (trade mark is PA2) of 0.5mm again.Pretightening force is 183.2t, is slightly less than the pretightening force of experiment for the first time, and all banks close face under the prefastening load does not all have offsetting or separation.Add centre-line load and eccentric load, its loading environment is with experiment for the first time.Load 90MPa (being equivalent to 225t) and 120MPa (being equivalent to 340t), A
1, A
2, A
3And A
4The surface lacquer painting is intact, does not have any lacquer and splits.Close at bank and to be carved with cut on the face, but do not see that cut offsets, but B
1, B
2, B
3And B
4Lacquer painting produced through check.
Experiment conclusion:
1) under the pretension state, A
1, A
2, A
3And A
4Bank closes the equal bank of face and closes and connect completely, does not have any offsetting.When the first time, pretension twined, the concentric circles that increases friction is only arranged and do not have the titanium plate, when pretension twined for the second time, folder added the titanium plate with good adhesive properties again on existing interface.Have or not the titanium plate, very little to twining the pretension influence, difference is not seen in this experiment.
2) work loads behind the pretension first time, experiment show, (press in the loader and are 70MPa) when load is 198t, A
1Bank closes the finish paint face and produces through check, illustrates that bank closes the bigger variation of offsetting or local detachment or pressure stress is arranged on the face.It is still high-visible to continue to load the back crackle.And loading experiment for the second time, same loading environment, and pretightening force is not met the category-A bank yet and is closed generation lacquer painting crackle than for the first time also little when load adds to 340t.This contrast experiment proves absolutely that the titanium plate is to improving the significance that bank closes connection reliability.
3) reinforcement wire twines the pretightening force that produces and can guarantee that bank closes the reliable sill of face (be lined with the titanium plate, be carved with concentric circles) and closes the required compressive pre-stress of connection.
4) for the first time and work loads experiment for the second time show that when work loads reaches 255t and 340t, during considerably beyond the pretightening force (198t and 183.2t) of experiment frame, the category-B interface is normal owing to the forfeiture of pressure stress separates.
Claims (5)
1. the method that connects of a prestress fitting is characterized in that this method carries out as follows:
A, bank close determining of face:
Under the condition of determining integral mechanical structure and design of part, at first the overall structure of subdivision is not carried out stress-strain analysis according to its stressing conditions; When on needing the part of subdivision, selecting the pretension state those based on pressure stress, numerical value big and when work loads the little section of pressure stress fluctuation close face as bank, closing on the face the part subdivision at bank is that several sizes and weight are less than this part and be easy to the component processing, transport and lift;
Determining of b, prefastening load:
Earlier default bank closes the friction factor of face, adjusts the prefastening load value that is applied on the component connecting body again, calculates bank by the numerical analysis method and closes σ and τ on the face, judges whether it satisfies and do not have the dislocation-free of separation criterion:
μ ∫ σ d σ df＞∫ τ d τ df and σ＞0 (I)
Wherein: f is that bank closes the face area
μ is that bank closes the face friction factor
σ is a direct stress
τ is a shearing stress
When do not have separating the offsetting criterion when satisfying, then the size of this value and be distributed as definite prefastening load is calculated otherwise need readjust the prefastening load value, does not have the dislocation-free of separation criterion up to satisfying, and forms firm nothing separation offsetting connection; Described component connecting body is a plurality ofly to be closed face by the component of subdivision through bank and be connected to each other together overall structure;
C, bank close face and handle:
To the compounding that bank closes the processing of face adhesion, roughening processing or adhesion and roughening, the friction factor that makes bank close face meets or exceeds default value among the step b;
D, pre-stressed joint: with the prefastening load of determining among the b surface treated component in the c step is carried out pretension, form the machine parts of an integral body.
2. the method that connects according to the described prestress fitting of claim 1 is characterized in that: the method that the pretension described in the steps d adopts the winding of reinforcement wire winding layer, pretension bolt pretension or interference to assemble.
3. the method that connects according to the described prestress fitting of claim 1, it is characterized in that: the adhesion processing described in the step c is to close the face folder at bank to add good sheet metal of stickability or non-metal board, its thickness 0.1～10mm, and the surface texturing that sheet metal or non-metal board are intended to improve adhesiveness handled; Or close at bank and to carry out plasma spraying, thermal spraying, electric arc spraying on the face or to electroplate the good metal layer of adhesiveness, its thickness is 0.1～1mm.
4. the method that connects according to the described prestress fitting of claim 3 is characterized in that: described sheet metal or metal layer employing titanium, titanium alloy, aluminum or aluminum alloy material.
5. according to the method for the described prestress fitting connection of claim 1, it is characterized in that: the roughening described in the step c is handled and is comprised:
1), shot-peening, sandblast;
2) laser roughening method is closed the surface gasification of ablating with laser to bank, and the formation degree of depth is 0.01～0.5mm, and diameter is the texturing point of 0.05-0.2mm;
3) cutting method, closing the surface with cutter at bank, to depict the degree of depth be 0.1-0.5mm, width is the decorative pattern of 0.1-0.5mm;
4) roller flower method, closing the surface roll extrusion degree of depth with the roller cutter at bank is 0.1-0.5mm, width is the decorative pattern of 0.1-0.5mm;
5) close the surface with grinding tool polishing bank.
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|---|---|---|---|
| CNB2005100985841A CN100371614C (en) | 2005-09-06 | 2005-09-06 | Prestress fitting connection method |
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Cited By (5)
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| CN101579938B (en) * | 2009-06-08 | 2011-07-20 | 清华大学 | Reinforcement wire wound inner concave beam frame |
| CN102198487A (en) * | 2010-04-20 | 2011-09-28 | 机械科学研究总院先进制造技术研究中心 | Fitting-structure-based dieless assembly molding method |
| CN102416708A (en) * | 2011-11-11 | 2012-04-18 | 福建海源自动化机械股份有限公司 | Horizontally pre-tightened and combined wound plate frame type press machine rack |
| CN102947554A (en) * | 2010-06-22 | 2013-02-27 | 谢夫勒科技股份两合公司 | Device for controlling the valve control times of an internal combustion engine |
| CN110595746A (en) * | 2019-08-30 | 2019-12-20 | 中国航空工业集团公司沈阳飞机设计研究所 | Titanium alloy test piece and test method |
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| LU86442A1 (en) * | 1986-05-23 | 1987-12-16 | Arbed | PROCESS FOR THE MANUFACTURE OF PRE-STRESSED STEEL BEAMS |
| KR100214113B1 (en) * | 1993-05-11 | 1999-08-02 | 오가사와라 쇼헤이 | Manufacture of tunnel liner and apparatus for the same |
| JPH08121442A (en) * | 1994-10-26 | 1996-05-14 | Mitsubishi Electric Corp | Adhesion joint body, method for joining the same, and rivet |
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| CN102198487A (en) * | 2010-04-20 | 2011-09-28 | 机械科学研究总院先进制造技术研究中心 | Fitting-structure-based dieless assembly molding method |
| WO2011131074A1 (en) * | 2010-04-20 | 2011-10-27 | 机械科学院研究总院先进制造技术研究中心 | Molding method for patternless casting assembly based on bumpy ridge structure |
| CN102198487B (en) * | 2010-04-20 | 2013-01-09 | 机械科学研究总院先进制造技术研究中心 | Fitting-structure-based dieless assembly molding method |
| AU2011242313B2 (en) * | 2010-04-20 | 2013-08-08 | Advanced Manufacture Technology Center, China Academy Of Machinery Science & Technology | Molding method for patternless casting assembly based on bumpy ridge structure |
| CN102947554A (en) * | 2010-06-22 | 2013-02-27 | 谢夫勒科技股份两合公司 | Device for controlling the valve control times of an internal combustion engine |
| US8931447B2 (en) | 2010-06-22 | 2015-01-13 | Schaeffler Technologies Gmbh & Co. Kg | Device for controlling the valve control times of an internal combustion engine |
| CN102947554B (en) * | 2010-06-22 | 2015-05-20 | 谢夫勒科技股份两合公司 | Device for controlling the valve control times of an internal combustion engine |
| CN102416708A (en) * | 2011-11-11 | 2012-04-18 | 福建海源自动化机械股份有限公司 | Horizontally pre-tightened and combined wound plate frame type press machine rack |
| CN110595746A (en) * | 2019-08-30 | 2019-12-20 | 中国航空工业集团公司沈阳飞机设计研究所 | Titanium alloy test piece and test method |
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| Publication number | Publication date |
|---|---|
| CN100371614C (en) | 2008-02-27 |
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