CN111119915A - High-strength TBM (tunnel boring machine) center knife box and preparation method thereof - Google Patents
High-strength TBM (tunnel boring machine) center knife box and preparation method thereof Download PDFInfo
- Publication number
- CN111119915A CN111119915A CN201911300442.7A CN201911300442A CN111119915A CN 111119915 A CN111119915 A CN 111119915A CN 201911300442 A CN201911300442 A CN 201911300442A CN 111119915 A CN111119915 A CN 111119915A
- Authority
- CN
- China
- Prior art keywords
- box
- cutter box
- strength
- tbm
- treatment
- 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.)
- Granted
Links
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000003466 welding Methods 0.000 claims abstract description 68
- 238000000034 method Methods 0.000 claims abstract description 51
- 238000000137 annealing Methods 0.000 claims abstract description 46
- 238000010791 quenching Methods 0.000 claims abstract description 43
- 230000000171 quenching effect Effects 0.000 claims abstract description 43
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 30
- 239000000956 alloy Substances 0.000 claims abstract description 30
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 30
- 238000005496 tempering Methods 0.000 claims abstract description 30
- 229910000746 Structural steel Inorganic materials 0.000 claims abstract description 24
- 239000010410 layer Substances 0.000 claims description 57
- 239000000463 material Substances 0.000 claims description 37
- 238000010438 heat treatment Methods 0.000 claims description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 28
- 229910052720 vanadium Inorganic materials 0.000 claims description 17
- 238000005253 cladding Methods 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 14
- 229910052748 manganese Inorganic materials 0.000 claims description 14
- 229910052804 chromium Inorganic materials 0.000 claims description 11
- 229910052758 niobium Inorganic materials 0.000 claims description 10
- 229910052719 titanium Inorganic materials 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 238000003754 machining Methods 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 239000002344 surface layer Substances 0.000 claims description 7
- 229910052721 tungsten Inorganic materials 0.000 claims description 7
- 238000005242 forging Methods 0.000 abstract description 20
- 238000005336 cracking Methods 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 239000011651 chromium Substances 0.000 description 10
- 239000011435 rock Substances 0.000 description 9
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 229910000851 Alloy steel Inorganic materials 0.000 description 5
- 229910001339 C alloy Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
- E21D9/087—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/30—Stress-relieving
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention provides a high-strength TBM (tunnel boring machine) center knife box and a preparation method thereof. The inner cutter box is subjected to quenching and tempering and hardening treatment, and is connected in a welding mode by adopting the inner cutter box and the outer cutter box, the inner cutter box and the outer cutter box are formed by adopting a forging process, and the inner cutter box is made of low-carbon medium alloy structural steel to reduce the welding stress concentration and the cracking deformation of the inner cutter box and the outer cutter box; the surface hardening treatment of the inner cutter box can improve the strength and fatigue performance of the bearing part, and the stress relief annealing treatment of the inner cutter box and the outer cutter box can effectively reduce the distribution of residual stress in the forging forming process and the welding stress concentration points of the inner cutter box and the outer cutter box.
Description
Technical Field
The invention relates to the field of TBM materials, in particular to a high-strength TBM center cutter box and a preparation method thereof.
Background
A hard rock tunnel boring machine (also called TBM) mainly achieves the purpose of breaking rock by means of extruding rock through disc-shaped hobbing cutters, wherein the TBM is called a king of engineering machinery, the hobbing cutters are called teeth of the TBM, and a cutter box is a teethridge and bears alternating load during rock breaking. Along with the increase of the rock strength, the efficiency of crushing the rock by the hob is gradually reduced, and the abnormal abrasion and replacement frequency of the hob box are increased. Because the hobbing cutter case welds on the blade disc, when crackle and the phenomenon of ftractureing need be changed, waste time and energy and seriously influence the construction progress, reduce tunnelling efficiency and then increase tunnel construction cost. The traditional tool box adopts a forging form, the process route is completed by adopting processes such as forging, rough machining, flaw detection, quenching and tempering, welding and the like, and failure means such as crushing deformation, tool box welding cracking and the like easily occur due to insufficient strength of the tool box under an extremely hard rock working condition (the existing tool box is mainly made of medium-carbon low alloy steel or medium-carbon medium alloy steel such as 30CrNiMo, 30Cr2Ni2Mo and the like). In order to solve the problems, the invention provides a novel material for a TBM (tunnel boring machine) knife box and a preparation method thereof, which solve the problems of low strength, easiness in crushing, cracking and the like of the existing knife box.
Disclosure of Invention
The invention provides a high-strength TBM (tunnel boring machine) center cutter box and a preparation method thereof, and solves the problems of low strength, easiness in crushing, cracking and the like of the existing cutter box.
The technical scheme for realizing the invention is as follows:
the utility model provides a central sword case of high strength TBM, includes outer sword case and interior sword case, and the outer sword case adopts low alloy structure steel material, and the alloy structure steel material in the interior sword case adopted the low carbon, and the interior sword case of interior outer sword case adopts the welded mode to combine together.
The low-alloy structural steel material adopted by the outer cutter box comprises the following components in percentage by weight: c: 0.11-0.18%, Si: 0.2-0.5%, Mn: 0.38-0.58%, V: 0.07-0.12%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron.
The low-carbon medium alloy structural steel material adopted by the inner cutter box comprises the following components in percentage by weight: c: 0.11-0.17%, Si: 0.2-0.4%, Mn: 0.38-0.58%, Cr: 1.45-1.75%, Ni: 4.5-5.2%, W: 0.9-1.3%, V: 0.08-0.10%, Ti: 0.03 to 0.06%, Nb: 0.01-0.02%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron. The addition of the forming elements of the strong carbides of the trace elements Nb, V and Ti can ensure that the steel can be dispersed and precipitated through carbon and nitride particles (the size is less than 5 nm) of the steel and solid solution of Nb, V and Ti to refine grains when the carbon equivalent is low, greatly improve the strength and toughness of the steel, particularly the low-temperature toughness (the effect on TBM equipment in high-altitude and high-cold areas is outstanding), ensure that the steel has good weldability, and provide a powerful guarantee for the welding process of the inner and outer cutter boxes.
The invention selects the inner cutter box material as low-carbon medium alloy steel, the carbon content of which is close to that of the outer cutter box material, and the problems of welding cracking, large welding deformation, residual stress concentration after welding and the like in the welding process of the inner cutter box and the outer cutter box are avoided.
The inner tool box is made of low-carbon medium alloy steel, the strength and toughness are good after quenching and tempering, the hardenability is good due to the addition of alloy elements, medium-frequency quenching is carried out on the bearing area of the inner tool box, the depth of a hardened layer is controlled to be 10-25mm, the strength of the bearing part of the inner tool box is greatly improved, and direct damage to the tool box caused by high rock strength under extreme working conditions is reduced.
The preparation method of the high-strength TBM center knife box comprises the following steps:
(a) forging and forming the outer cutter box and the inner cutter box; the forging adopts a near-net-shape closed die forging process, the high-temperature and high-pressure rapid forming is realized, the feeding amount is accurate, the continuity of metal fibers is kept, the controllable plastic flow direction is obtained, a fine and uniform grain structure is obtained, the structure segregation is reduced, the mechanical property of the forging is improved, the material utilization rate is high, and the cost is saved;
preheating a die for 300-2 hours, setting forging parameters (including forging rate and blank parameters), starting forging, moving a male die downwards △ H1 in a basic forming stage, moving the male die downwards △ H2 in a full-groove stage, and forming longitudinal burrs, wherein the male die moves downwards △ H3;
(b) stress relief annealing treatment is carried out on the outer cutter box in the step (a);
(c) hardening and tempering the inner cutter box in the step (a);
(d) and (4) welding the outer cutter box and the inner cutter box, and then performing stress relief annealing treatment.
The stress relief annealing treatment in the step (b) comprises the following specific processes: the stress relief treatment is carried out in an atmosphere protection furnace, the furnace temperature is 190 +/-10 ℃, and the treatment time is 90-120 min.
Detecting, positioning and evaluating cracks, inclusions and the like on the surface layer and the core part of the inner cutter box by using an ultrasonic flaw detector, determining whether technical indexes are met, and hardening and tempering the inner cutter box meeting the technical indexes; the specific process of quenching and tempering in the step (c) is as follows: heating the inner knife box in a heat treatment furnace from room temperature to 520-minus-plus 580 ℃ at the speed of 100-150 ℃/h, preserving heat for 40min at the temperature of 520-minus-plus 580 ℃, heating the inner knife box to 850 +/-10 ℃ at the speed of 80-100 ℃/h, preserving heat for 1h at the temperature of 850 +/-10 ℃, finally quenching in an oil quenching mode, and tempering the inner knife box at the high temperature of 510 +/-10 ℃ in the heat treatment furnace for 3h, wherein the surface hardness is more than or equal to 33HRC after tempering.
The hardening treatment in the step (c) comprises the following specific processes: the bearing part of the inner cutter box is subjected to surface quenching in a medium-frequency quenching mode, the depth of a hardening layer is 10-25mm, the strength of the bearing part of the inner cutter box is greatly improved, the fatigue performance of the material of the cutter box is improved, the direct damage to the cutter box caused by the high rock strength under the extreme working condition is reduced, then a hardened layer is built up on the bearing part, and the strength of the bearing part of the inner cutter box is improved. In order to prevent the inner cutter box from further failure and improve the strength of the bearing part of the inner cutter box, the bearing part of the inner cutter box is subjected to wear-resistant layer surfacing or vacuum ion coating, ions are injected into the surface in a vacuum environment, N, Cr ions are injected, carbides, nitrides and the like are precipitated on the surface, the surface hardness is increased, the surface strength is improved, the material strength and the fatigue resistance are improved, and the service life under extreme working conditions is prolonged.
The hardened layer is a wear-resistant layer or a plasma cladding layer, wherein the wear-resistant layer is a high-carbon high-chromium surfacing coating, the thickness of the wear-resistant layer is 3-6mm, the plasma cladding is a metal ceramic composite cladding layer, and the thickness of the plasma cladding layer is 3-4 mm.
After welding, detecting, positioning and evaluating cracks, inclusions and the like of the assembly welding seam by using an ultrasonic flaw detector, and performing stress relief annealing treatment after confirming that technical indexes are met; the specific process of the welding treatment comprises the following steps: preheating the outer knife box and the inner knife box at the temperature of 200-250 ℃, controlling the current to be 310A and the voltage to be 27-34V for welding, and adopting the American imported low-carbon alloy flux-cored wire for welding at present; the stress relief annealing treatment comprises the following specific processes: stress relief treatment is carried out in an atmosphere protection furnace, the furnace temperature is 200 +/-10 ℃, and the treatment time is 90-120 min.
Carrying out finish turning on the inner cutter box subjected to the stress relief annealing treatment in the step (d), wherein the excircle tolerance of the machining precision is 0.01-0.02mm, and the roughness is 1.6; the aim is to remove a decarburized layer on the surface of the cutter box after heat treatment due to oxidation. The invention adopts the stress relief annealing treatment on the tempered inner cutter box to eliminate the residual stress and stress concentration phenomenon generated by the material structure after heat treatment, and carries out the stress relief annealing on the welding part of the inner cutter box and the outer cutter box to eliminate the stress concentration point and the nonuniform structure phenomenon of the welding part.
The invention has the beneficial effects that:
(1) the inner and outer cutter boxes are connected in a welding mode, the inner and outer cutter boxes are formed by adopting a forging process, and the inner cutter box is made of low-carbon medium alloy structural steel so as to reduce the welding stress concentration and cracking deformation of the inner and outer cutter boxes. The inner cutter box is developed and designed into low-carbon medium-alloy structural steel, trace alloy elements such as Nb, V and Ti are added, crystal grains are refined on the basis of reducing the carbon content, the toughness of alloy steel is improved, the dispersion strengthening effect of carbon and nitride is formed, the strength of parts is improved, and the low-carbon medium-alloy structural steel has good strength and toughness;
(2) the surface hardening treatment of the inner cutter box can improve the strength and fatigue performance of the bearing part and prolong the service life;
(3) the stress relief annealing treatment of the inner and outer cutter boxes can effectively reduce the distribution of residual stress in the forging forming process and the welding stress concentration points of the inner and outer cutter boxes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of a knife box of the present invention;
fig. 2 is a top view of the knife box of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
The utility model provides a high strength TBM center sword case, includes outer sword case 101 and interior sword case 102, and outer sword case 101 adopts low alloy structure steel material, and interior sword case 102 adopts alloy structure steel material in the low carbon.
The low-alloy structural steel material adopted by the outer cutter box 101 comprises the following components in percentage by weight: c: 0.11%, Si: 0.2%, Mn: 0.38%, V: 0.07%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron.
The low-carbon medium-alloy structural steel material adopted by the inner cutter box 102 comprises the following components in percentage by weight: c: 0.11%, Si: 0.2%, Mn: 0.38%, Cr: 1.45%, Ni: 4.5%, W: 0.9%, V: 0.08%, Ti: 0.03%, Nb: 0.01%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron.
The preparation method of the high-strength TBM center knife box comprises the following steps:
(a) forging and forming the outer cutter box 101 and the inner cutter box 102;
(b) stress relief annealing treatment is carried out on the outer cutter box 101 in the step (a); the stress relief annealing treatment comprises the following specific processes: performing stress relief treatment in an atmosphere protection furnace at 180 ℃ for 120 min;
(c) detecting the surface layer and the core part of the inner cutter box 102 by using an ultrasonic flaw detector, confirming whether the technical indexes are met, and hardening and tempering the inner cutter box 102 meeting the technical indexes;
the specific process of the quenching and tempering treatment comprises the following steps: heating the inner knife box 102 in a heat treatment furnace at a speed of 110 ℃/h from room temperature to 520 ℃, preserving heat at the temperature of 580 ℃ for 40min at the temperature of 520-;
the concrete process of the hardening treatment is as follows: carrying out surface quenching on the bearing part 104 of the inner cutter box 102 in a medium-frequency quenching mode, wherein the depth of a hardening layer is 10mm, and then carrying out surfacing welding on the bearing part 104 to form a hardened layer 105; the hardened layer 105 is a plasma cladding layer, the plasma cladding layer is a metal ceramic composite cladding layer, and the thickness of the plasma cladding layer is 3 mm;
(d) welding the outer cutter box 101 and the inner cutter box 102, assembling and welding a welding seam 103 by ultrasonic flaw detection after welding, and performing stress-relief annealing treatment after confirming that the technical indexes are met; the specific process of the welding treatment comprises the following steps: preheating the outer cutter box 101 and the inner cutter box 102 at 200 ℃, and controlling the current to be 220A and the voltage to be 27V for welding; after welding, performing stress relief annealing treatment, wherein the stress relief annealing treatment comprises the following specific processes: and (3) performing stress relief treatment in an atmosphere protection furnace, wherein the temperature of the treatment furnace is 190 ℃, and the treatment time is 90 min.
And (d) carrying out finish turning on the inner cutter box 102 subjected to the stress relief annealing treatment in the step (d), wherein the machining precision excircle tolerance is 0.01mm, and the roughness is 1.6, so that a decarburized layer on the surface of the cutter box subjected to the heat treatment, which is caused by oxidation, is removed.
Example 2
The utility model provides a high strength TBM center sword case, includes outer sword case 101 and interior sword case 102, and outer sword case 101 adopts low alloy structure steel material, and interior sword case 102 adopts alloy structure steel material in the low carbon.
The low-alloy structural steel material adopted by the outer cutter box 101 comprises the following components in percentage by weight: c: 0.14%, Si: 0.3%, Mn: 0.40%, V: 0.09%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron.
The low-carbon medium-alloy structural steel material adopted by the inner cutter box 102 comprises the following components in percentage by weight: c: 0.13%, Si: 0.3%, Mn: 0.42%, Cr: 1.50%, Ni: 4.8%, W: 1.2%, V: 0.09%, Ti: 0.04%, Nb: 0.015%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron.
The preparation method of the high-strength TBM center knife box comprises the following steps:
(a) forging and forming the outer cutter box 101 and the inner cutter box 102;
(b) stress relief annealing treatment is carried out on the outer cutter box 101 in the step (a); the stress relief annealing treatment comprises the following specific processes: performing stress relief treatment in an atmosphere protection furnace at the furnace temperature of 190 ℃ for 100 min;
(c) detecting the surface layer and the core part of the inner cutter box 102 by using an ultrasonic flaw detector, confirming whether the technical indexes are met, and hardening and tempering the inner cutter box 102 meeting the technical indexes;
the specific process of the quenching and tempering treatment comprises the following steps: heating the inner knife box 102 in a heat treatment furnace at a speed of 140 ℃/h from room temperature to 530 ℃, preserving heat at 530 ℃ for 40min, heating the inner knife box 102 at a speed of 95 ℃/h to 845 ℃, preserving heat at 845 ℃ for 1h, finally quenching in an oil quenching mode, wherein the surface hardness after quenching is more than or equal to 48HRC, and finally tempering the inner knife box 102 in the heat treatment furnace at a high temperature of 515 ℃, preserving heat for 3h, and the surface hardness after tempering is more than or equal to 33 HRC;
the concrete process of the hardening treatment is as follows: carrying out surface quenching on the bearing part 104 of the inner cutter box 102 in a medium-frequency quenching mode, wherein the depth of a hardening layer is 15mm, and then carrying out surfacing welding on the bearing part 104 to form a hardened layer 105; the hardened layer 105 is a plasma cladding layer, the plasma cladding layer is a metal ceramic composite cladding layer, and the thickness of the plasma cladding layer is 4 mm;
(d) welding the outer cutter box 101 and the inner cutter box 102, assembling and welding a welding seam 103 by ultrasonic flaw detection after welding, and performing stress-relief annealing treatment after confirming that the technical indexes are met; the specific process of the welding treatment comprises the following steps: preheating the outer cutter box 101 and the inner cutter box 102 at 210 ℃, controlling the current to be 240A, and welding under the voltage of 34V, wherein the welding is carried out by adopting a low-carbon alloy flux-cored wire imported from America at present; after welding, performing stress relief annealing treatment, wherein the stress relief annealing treatment comprises the following specific processes: the stress relief treatment is carried out in an atmosphere protection furnace, the furnace temperature is 195 ℃, and the treatment time is 95 min.
And (d) carrying out finish turning on the inner cutter box 102 subjected to the stress relief annealing treatment in the step (d) so as to remove a decarburized layer on the surface of the cutter box after the heat treatment due to oxidation.
Example 3
The utility model provides a high strength TBM center sword case, includes outer sword case 101 and interior sword case 102, and outer sword case 101 adopts low alloy structure steel material, and interior sword case 102 adopts alloy structure steel material in the low carbon.
The low-alloy structural steel material adopted by the outer cutter box 101 comprises the following components in percentage by weight: c: 0.16%, Si: 0.4%, Mn: 0.45%, V: 0.10%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron.
The low-carbon medium-alloy structural steel material adopted by the inner cutter box 102 comprises the following components in percentage by weight: c: 0.16%, Si: 0.35%, Mn: 0.42%, Cr: 1.55%, Ni: 5.0%, W: 1.2%, V: 0.09%, Ti: 0.05%, Nb: 0.02%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron.
The preparation method of the high-strength TBM center knife box comprises the following steps:
(a) forging and forming the outer cutter box 101 and the inner cutter box 102;
(b) stress relief annealing treatment is carried out on the outer cutter box 101 in the step (a); the stress relief annealing treatment comprises the following specific processes: performing stress relief treatment in an atmosphere protection furnace at 200 ℃ for 110 min;
(c) detecting the surface layer and the core part of the inner cutter box 102 by using an ultrasonic flaw detector, confirming whether the technical indexes are met, and hardening and tempering the inner cutter box 102 meeting the technical indexes;
the specific process of the quenching and tempering treatment comprises the following steps: heating the inner knife box 102 in a heat treatment furnace at a speed of 100 ℃/h from room temperature to 540 ℃, preserving heat at 540 ℃ for 40min, heating the inner knife box 102 at a speed of 80 ℃/h to 850 ℃, preserving heat at 850 ℃ for 1h, finally quenching in an oil quenching mode, wherein the surface hardness after quenching is more than or equal to 48HRC, and finally tempering the inner knife box 102 in the heat treatment furnace at a high temperature of 520 ℃, preserving heat for 3h, and the surface hardness after tempering is more than or equal to 33 HRC;
the concrete process of the hardening treatment is as follows: carrying out surface quenching on the bearing part 104 of the inner cutter box 102 in a medium-frequency quenching mode, wherein the depth of a hardening layer is 20mm, and then carrying out surfacing welding on the bearing part 104 to form a hardened layer 105; the hardened layer 105 is a wear-resistant layer, the wear-resistant layer is a high-carbon high-chromium surfacing coating, and the thickness of the wear-resistant layer is 5 mm;
(d) welding the outer cutter box 101 and the inner cutter box 102, assembling and welding a welding seam 103 by ultrasonic flaw detection after welding, and performing stress-relief annealing treatment after confirming that the technical indexes are met; the specific process of the welding treatment comprises the following steps: preheating the outer cutter box 101 and the inner cutter box 102 at 220 ℃, controlling the current to be 260A and the voltage to be 34V for welding, and adopting a low-carbon alloy flux-cored wire imported from America to weld at present; after welding, performing stress relief annealing treatment, wherein the stress relief annealing treatment comprises the following specific processes: and (3) performing stress relief treatment in an atmosphere protection furnace, wherein the furnace temperature is 200 ℃, and the treatment time is 100 min.
And (d) carrying out finish turning on the inner cutter box 102 subjected to the stress relief annealing treatment in the step (d), wherein the machining precision excircle tolerance is 0.02mm, and the roughness is 1.6, so that a decarburized layer on the surface of the cutter box subjected to the heat treatment, which is caused by oxidation, is removed.
Example 4
The utility model provides a high strength TBM center knife case, includes outer knife case 101 and interior knife case 102, and outer knife case 101 adopts structural steel material, and interior knife case 102 adopts alloy structural steel material in the low carbon.
The structural steel material adopted by the outer knife box 101 comprises the following components in percentage by weight: c: 0.18%, Si: 0.5%, Mn: 0.58%, V: 0.12%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron.
The low-carbon medium-alloy structural steel material adopted by the inner cutter box 102 comprises the following components in percentage by weight: c: 0.17%, Si: 0.4%, Mn: 0.58%, Cr: 1.75%, Ni: 5.2%, W: 1.3%, V: 0.10%, Ti: 0.06%, Nb: 0.02%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron.
The preparation method of the high-strength TBM center knife box comprises the following steps:
(a) forging and forming the outer cutter box 101 and the inner cutter box 102;
(b) stress relief annealing treatment is carried out on the outer cutter box 101 in the step (a); the stress relief annealing treatment comprises the following specific processes: performing stress relief treatment in an atmosphere protection furnace at 185 ℃ for 120 min;
(c) detecting the surface layer and the core part of the inner cutter box 102 by using an ultrasonic flaw detector, confirming whether the technical indexes are met, and hardening and tempering the inner cutter box 102 meeting the technical indexes;
the specific process of the quenching and tempering treatment comprises the following steps: heating the inner knife box 102 in a heat treatment furnace at a speed of 130 ℃/h from room temperature to 570 ℃, preserving heat at 570 ℃ for 40min, heating the inner knife box 102 at a speed of 90 ℃/h to 855 ℃, preserving heat at 855 ℃ for 1h, finally quenching in an oil quenching mode, wherein the surface hardness after quenching is more than or equal to 48HRC, and finally tempering the inner knife box 102 in the heat treatment furnace at a high temperature of 505 ℃ for 3h, wherein the surface hardness after tempering is more than or equal to 33 HRC;
the concrete process of the hardening treatment is as follows: carrying out surface quenching on the bearing part 104 of the inner cutter box 102 in a medium-frequency quenching mode, wherein the depth of a hardening layer is 25mm, and then carrying out surfacing welding on the bearing part 104 to form a hardened layer 105; the hardened layer 105 is a wear-resistant layer, the wear-resistant layer is a high-carbon high-chromium surfacing coating, and the thickness of the wear-resistant layer is 6 mm;
(d) welding the outer cutter box 101 and the inner cutter box 102, assembling and welding a welding seam 103 by ultrasonic flaw detection after welding, and performing stress-relief annealing treatment after confirming that the technical indexes are met; the specific process of the welding treatment comprises the following steps: preheating the outer cutter box 101 and the inner cutter box 102 at 230 ℃, controlling the current to be 280A and the voltage to be 30V for welding, and adopting a low-carbon alloy flux-cored wire imported from America to weld at present; after welding, performing stress relief annealing treatment, wherein the stress relief annealing treatment comprises the following specific processes: and (3) performing stress relief treatment in an atmosphere protection furnace, wherein the furnace temperature is 205 ℃, and the treatment time is 110 min.
And (d) carrying out finish turning on the inner cutter box 102 subjected to the stress relief annealing treatment in the step (d), wherein the machining precision excircle tolerance is 0.01mm, and the roughness is 1.6, so that a decarburized layer on the surface of the cutter box subjected to the heat treatment, which is caused by oxidation, is removed.
Example 5
The utility model provides a high strength TBM center knife case, includes outer knife case 101 and interior knife case 102, and outer knife case 101 adopts structural steel material, and interior knife case 102 adopts alloy structural steel material in the low carbon.
The structural steel material adopted by the outer knife box 101 comprises the following components in percentage by weight: c: 0.13%, Si: 0.4%, Mn: 0.45%, V: 0.09%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron.
The low-carbon medium-alloy structural steel material adopted by the inner cutter box 102 comprises the following components in percentage by weight: c: 0.14%, Si: 0.35%, Mn: 0.46%, Cr: 1.65%, Ni: 4.9%, W: 1.2%, V: 0.08%, Ti: 0.05%, Nb: 0.01%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron.
The preparation method of the high-strength TBM center knife box comprises the following steps:
(a) forging and forming the outer cutter box 101 and the inner cutter box 102; the specific forging process is a near-net-shape closed die forging process, high-temperature and high-pressure rapid forming is realized, the feeding amount is accurate, the continuity of metal fibers is kept, the controllable plastic flow direction is obtained, a fine and uniform grain structure is obtained, the structure segregation is reduced, the mechanical property of the forge piece is improved, the material utilization rate is high, and the cost is saved;
(b) stress relief annealing treatment is carried out on the outer cutter box 101 in the step (a); the stress relief annealing treatment comprises the following specific processes: performing stress relief treatment in an atmosphere protection furnace at the furnace temperature of 195 ℃ for 120 min;
(c) detecting the surface layer and the core part of the inner cutter box 102 by using an ultrasonic flaw detector, confirming whether the technical indexes are met, and hardening and tempering the inner cutter box 102 meeting the technical indexes;
the specific process of the quenching and tempering treatment comprises the following steps: heating the inner knife box 102 in a heat treatment furnace at the speed of 150 ℃/h from room temperature to 580 ℃, preserving heat at 580 ℃ for 40min, heating the inner knife box 102 at the speed of 100 ℃/h to 860 ℃, preserving heat at 860 ℃ for 1h, finally quenching in an oil quenching mode, wherein the surface hardness after quenching is more than or equal to 48HRC, and finally tempering the inner knife box 102 in the heat treatment furnace at the high temperature of 510 ℃, preserving heat for 3h, and the surface hardness after tempering is more than or equal to 33 HRC;
the concrete process of the hardening treatment is as follows: carrying out surface quenching on the bearing part 104 of the inner cutter box 102 in a medium-frequency quenching mode, wherein the depth of a hardening layer is 25mm, and then carrying out surfacing welding on the bearing part 104 to form a hardened layer 105; the hardened layer 105 is a wear-resistant layer or a plasma cladding layer, the thickness of the wear-resistant layer is 6mm, and the thickness of the plasma cladding layer is 4 mm;
(d) welding the outer cutter box 101 and the inner cutter box 102, assembling and welding a welding seam 103 by ultrasonic flaw detection after welding, and performing stress-relief annealing treatment after confirming that the technical indexes are met; the specific process of the welding treatment comprises the following steps: preheating the outer cutter box 101 and the inner cutter box 102 at 250 ℃, controlling the current to be 310A and the voltage to be 34V for welding, and adopting a low-carbon alloy flux-cored wire imported from America to weld at present; after welding, performing stress relief annealing treatment, wherein the stress relief annealing treatment comprises the following specific processes: and (3) performing stress relief treatment in an atmosphere protection furnace, wherein the furnace temperature is 210 ℃, and the treatment time is 120 min.
And (d) carrying out finish turning on the inner cutter box 102 subjected to the stress relief annealing treatment in the step (d), wherein the machining precision excircle tolerance is 0.01-0.02mm, and the roughness is 1.6, so that a decarburized layer on the surface of the cutter box subjected to the heat treatment, which is caused by oxidation, is removed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a central sword case of high strength TBM which characterized in that: the combined type cutter box comprises an outer cutter box (101) and an inner cutter box (102), wherein the outer cutter box (101) is made of low-alloy structural steel materials, and the inner cutter box (102) is made of low-carbon medium-alloy structural steel materials.
2. The high-strength TBM center knife box according to claim 1, characterized in that the low-alloy structural steel material adopted by the outer knife box (101) comprises the following components in percentage by weight: c: 0.11-0.18%, Si: 0.2-0.5%, Mn: 0.38-0.58%, V: 0.07-0.12%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron.
3. The high-strength TBM center knife box according to claim 1, characterized in that the low-carbon medium-alloy structural steel material adopted by the inner knife box (102) comprises the following components in percentage by weight: c: 0.11-0.17%, Si: 0.2-0.4%, Mn: 0.38-0.58%, Cr: 1.45-1.75%, Ni: 4.5-5.2%, W: 0.9-1.3%, V: 0.08-0.10%, Ti: 0.03 to 0.06%, Nb: 0.01-0.02%, S: less than or equal to 0.02 percent, P: less than or equal to 0.02 percent, and the balance being iron.
4. The preparation method of the high-strength TBM center knife box of any one of claims 1 to 3, which is characterized by comprising the following steps:
(a) the outer cutter box (101) and the inner cutter box (102) are forged and formed;
(b) stress relief annealing treatment is carried out on the outer cutter box (101) in the step (a);
(c) hardening and tempering the inner knife box (102) in the step (a);
(d) and (3) welding the outer cutter box (101) and the inner cutter box (102), and performing stress relief annealing treatment after welding.
5. The method for preparing the high-strength TBM center knife box according to claim 4, wherein the stress relief annealing treatment in the step (b) comprises the following specific steps: the stress relief treatment is carried out in an atmosphere protection furnace, the furnace temperature is 190 +/-10 ℃, and the treatment time is 90-120 min.
6. The method for preparing the high-strength TBM center tool box according to claim 4, wherein the surface layer and the core part of the inner tool box (102) are detected by an ultrasonic flaw detector, whether technical indexes are met is confirmed, and the inner tool box (102) meeting the technical indexes is subjected to quenching and tempering and hardening treatment; the specific process of quenching and tempering in the step (c) is as follows: heating the inner knife box (102) in a heat treatment furnace from room temperature to 520-580 ℃ at the speed of 100-150 ℃/h, preserving heat at 520-580 ℃ for 40min, heating the inner knife box (102) to 850 +/-10 ℃ at the speed of 80-100 ℃/h, preserving heat at 850 +/-10 ℃ for 1h, finally quenching in an oil quenching mode, and tempering the inner knife box (102) at the high temperature of 510 +/-10 ℃ in the heat treatment furnace for 3h, wherein the surface hardness after quenching is more than or equal to 48 HRC.
7. The method for preparing the high-strength TBM center knife box according to claim 4, wherein the hardening treatment in the step (c) is carried out in the following specific process: carrying out surface quenching on a bearing part (104) of the inner cutter box (102) in a medium-frequency quenching mode, wherein the depth of a hardening layer is 10-25mm, and then carrying out surfacing hardening layer (105) on the bearing part (104).
8. The preparation method of the high-strength TBM center knife box according to claim 7, wherein the hardened layer (105) is a wear-resistant layer or a plasma cladding layer, the thickness of the wear-resistant layer is 3-6mm, and the thickness of the plasma cladding layer is 3-4 mm.
9. The method for preparing the high-strength TBM center knife box according to the claim 4, wherein after the welding in the step (d), an ultrasonic flaw detection assembly welding seam (103) is used, and after the technical index is confirmed to be met, stress relief annealing treatment is carried out; the specific process of the welding treatment comprises the following steps: preheating the outer knife box (101) and the inner knife box (102) at the temperature of 200-250 ℃, controlling the current to be 220-310A, and welding at the voltage of 27-34V; the stress relief annealing treatment comprises the following specific processes: stress relief treatment is carried out in an atmosphere protection furnace, the furnace temperature is 200 +/-10 ℃, and the treatment time is 90-120 min.
10. The method for preparing the high-strength TBM center knife box according to any one of claims 5 to 9, wherein the method comprises the following steps: and (d) carrying out finish turning on the inner cutter box (102) subjected to the stress relief annealing treatment in the step (d), wherein the machining precision excircle tolerance is 0.01-0.02mm, and the roughness is 1.6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911300442.7A CN111119915B (en) | 2019-12-17 | 2019-12-17 | High-strength TBM (tunnel boring machine) center knife box and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911300442.7A CN111119915B (en) | 2019-12-17 | 2019-12-17 | High-strength TBM (tunnel boring machine) center knife box and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111119915A true CN111119915A (en) | 2020-05-08 |
| CN111119915B CN111119915B (en) | 2021-04-23 |
Family
ID=70499145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911300442.7A Active CN111119915B (en) | 2019-12-17 | 2019-12-17 | High-strength TBM (tunnel boring machine) center knife box and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111119915B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113930666A (en) * | 2021-09-02 | 2022-01-14 | 中铁工程装备集团有限公司 | Preparation method and application of tool apron material for TBM |
| CN114856592A (en) * | 2022-04-02 | 2022-08-05 | 中铁工程装备集团隧道设备制造有限公司 | Composite connection high-strength knife box and forming method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998003769A1 (en) * | 1996-07-17 | 1998-01-29 | The University Of Queensland | A disc cutter |
| CN107313782A (en) * | 2017-07-14 | 2017-11-03 | 中国铁建重工集团有限公司 | A kind of hob holder |
| CN107664036A (en) * | 2016-07-29 | 2018-02-06 | 上海力行工程技术发展有限公司 | A kind of center assembly for connecting shield cutter and cutter plate driver axle |
| CN107842369A (en) * | 2017-12-11 | 2018-03-27 | 安徽天重工股份有限公司 | A kind of Hob cutter ring of shield machine and its manufacture method with built-up welding cobalt-base alloys |
| CN108150184A (en) * | 2018-01-19 | 2018-06-12 | 辽宁三三工业有限公司 | The full stratum cutterhead of large-diameter earth pressure balance shield machine |
| CN109441466A (en) * | 2018-12-28 | 2019-03-08 | 安徽铜都流体科技股份有限公司 | Knife cylinder in a kind of self-centering type of normal pressure tool changing device |
-
2019
- 2019-12-17 CN CN201911300442.7A patent/CN111119915B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998003769A1 (en) * | 1996-07-17 | 1998-01-29 | The University Of Queensland | A disc cutter |
| CN107664036A (en) * | 2016-07-29 | 2018-02-06 | 上海力行工程技术发展有限公司 | A kind of center assembly for connecting shield cutter and cutter plate driver axle |
| CN107313782A (en) * | 2017-07-14 | 2017-11-03 | 中国铁建重工集团有限公司 | A kind of hob holder |
| CN107842369A (en) * | 2017-12-11 | 2018-03-27 | 安徽天重工股份有限公司 | A kind of Hob cutter ring of shield machine and its manufacture method with built-up welding cobalt-base alloys |
| CN108150184A (en) * | 2018-01-19 | 2018-06-12 | 辽宁三三工业有限公司 | The full stratum cutterhead of large-diameter earth pressure balance shield machine |
| CN109441466A (en) * | 2018-12-28 | 2019-03-08 | 安徽铜都流体科技股份有限公司 | Knife cylinder in a kind of self-centering type of normal pressure tool changing device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113930666A (en) * | 2021-09-02 | 2022-01-14 | 中铁工程装备集团有限公司 | Preparation method and application of tool apron material for TBM |
| CN114856592A (en) * | 2022-04-02 | 2022-08-05 | 中铁工程装备集团隧道设备制造有限公司 | Composite connection high-strength knife box and forming method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111119915B (en) | 2021-04-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102619477B (en) | Wear and corrosion resistant iron-based alloy laser-cladding petroleum drill stem joint | |
| CN102766817B (en) | Semi-high speed steel shear steel | |
| CN101628374B (en) | Method for preparing forging mould by double-layer metal resurfacing welding based on cast steel substrate | |
| CN102357778B (en) | Manufacturing method of pulling straightening roller | |
| CN111119915B (en) | High-strength TBM (tunnel boring machine) center knife box and preparation method thereof | |
| CN105363780A (en) | Plain carbon steel and wear-resistant steel clad steel plate and production method thereof | |
| CN103706921A (en) | Build up welding repair method of supporting roller of hot continuous rolling finishing mill | |
| CN102658417A (en) | Welding repair technology of casting defect of high-chromium cast iron | |
| CN105081612A (en) | Plasma arc overlaying alloy powder used for heat-working die | |
| CN103949984B (en) | A kind of manufacturing process of wear resistant and impact resistant type knockout pipe and welding method thereof | |
| CN105312744B (en) | Middle manganese wear-resistant steel and 30MnSi chute steel gas metal-arc welding techniques | |
| CN114427091B (en) | High-wear-resistance die steel product for hot stamping and additive manufacturing process thereof | |
| CN108188658B (en) | Composite roller preparation process | |
| CN110983183B (en) | Cast TBM (tunnel boring machine) knife box and preparation method thereof | |
| CN111424220A (en) | Tool apron material in tunnel boring machine tool box, preparation method thereof and tool box | |
| CN101474713B (en) | High manganese steel frog and rail flash butt welding method | |
| CN111015073A (en) | Repairing and remanufacturing method of cold-work die steel Cr12Mo1V1 working roll | |
| CN115780025A (en) | Grinding roller of vertical mill and preparation method thereof | |
| CN114427090B (en) | High-strength and high-toughness die steel product for blanking and additive manufacturing process thereof | |
| CN111496415B (en) | High-performance dynamic fixed cone in cone crusher and preparation method thereof | |
| CN112458373B (en) | Casting material for guide sliding shoes of coal mining machine and preparation method | |
| CN114535751A (en) | Mining scraper CMT gradient surfacing layer and preparation method thereof | |
| CN114603234A (en) | Method for welding 42CrMo alloy steel and low-carbon steel dissimilar steel | |
| CN113930666B (en) | Preparation method and application of tool apron material for TBM | |
| CN114990425B (en) | Cutter for scrap steel crushing and preparation and repair methods thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |