CN108581170A - The manufacturing method of explosive welding composite roll, composite roll and application thereof - Google Patents
The manufacturing method of explosive welding composite roll, composite roll and application thereof Download PDFInfo
- Publication number
- CN108581170A CN108581170A CN201810305788.5A CN201810305788A CN108581170A CN 108581170 A CN108581170 A CN 108581170A CN 201810305788 A CN201810305788 A CN 201810305788A CN 108581170 A CN108581170 A CN 108581170A
- Authority
- CN
- China
- Prior art keywords
- roller
- composite roll
- explosive
- roller set
- explosive welding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/06—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of high energy impulses, e.g. magnetic energy
- B23K20/08—Explosive welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/03—Sleeved rolls
Abstract
The present invention discloses a kind of manufacturing method of explosive welding composite roll comprising：The material of outer layer the roller set and internal layer roller core of selected composite roll；By roller set with after roller core assembling, one layer of special low explosive is evenly arranged outside roller set；The component of roller set and roller core that explosive arrangement is completed is installed on outdoor Explosion composite place, setting priming device carries out Explosion composite, so that roller set is passed through explosive welding with roller core and is combined together；It tests to explosion bond quality；And to examining qualified compound roller stock to be heat-treated.The invention also discloses according to composite roll and application thereof made of previous building methods.Present invention utilizes explosive welding processing technologies, the laminating production of outer layer roller set and roller core suitable for various material, compared to traditional built-up welding and centrifugal casting processing method, explosive welding composite roll has many advantages, such as that weld strength is high, material surface performance is uniform, wear-resisting property is good, can be applied to working roll, support roller of various milling trains and conticaster etc. etc..
Description
Technical field
The present invention relates to composite roll manufacture and the technical field of purposes more particularly to the manufacturers of explosive welding composite roll
Method, composite roll and application thereof made of the manufacturing method of explosive welding composite roll.
Background technology
Composite roll is one of the main consumption spare part in STEELMAKING PRODUCTION, and roll consumption is about the 5%- of Rolling production cost
15%, this does not also include being shut down caused by roll consumption, dropping the increased costs such as production, plant maintenance.Meanwhile roller quality is especially
The indexs such as wearability, intensity and toughness, also seriously affect mill bar quality.
Traditional composite roll manufacturing method generally uses surface overlaying or centrifugal casting technique, these techniques are congenital to be had
The problems such as certain defect and deficiency receives burst check line, stomata as built-up welding is also easy to produce, and centrifugal casting is also easy to produce segregation, crackle.
Therefore, this field needs the roller that there are the comprehensive performances such as higher wearability and obdurability to require.How roller is improved
The performances such as wearability, intensity and the toughness of quality become those skilled in the art's technical problem urgently to be resolved hurrily.
Invention content
To solve above-mentioned the technical problems existing in the prior art, the present invention provides a kind of manufacture of explosive welding composite roll
Method utilizes Explosion composite principle, so that composite roll set is welded on roll ontology by the method for explosive processing, has welding
The advantages that intensity is high, material surface performance is uniform, and wear-resisting property is good, wherein shear strength can reach 340MPa, and hardness is reachable
52HRC.Moreover, the present invention can also be chosen according to use environment various materials composite roll set combined with roll body explode answer
It closes, application range is wide, is that the innovative of composite roll manufacturing technology is changed.The present invention also provides according to aforementioned explosive welding composite roll
Manufacturing method made of composite roll and application thereof.
The purpose of the invention is to meet the comprehensive performances such as wearability higher and higher in composite roll use and obdurability
It is required that explosion welding technique is produced applied to composite roll, it is applied to the working roll, support roller of all kinds of milling trains and conticaster etc.
Deng, such as Continuous Casting Rolls, section cooling roller, niproll etc..
For this purpose, the present invention provides a kind of manufacturing methods of explosive welding composite roll comprising：A) it selects according to requirements
Determine the material of outer layer the roller set and internal layer roller core of composite roll；B) after fitting together roller set with roller core, outside roller set uniformly
Arrange one layer of special low explosive；C) component of roller set and roller core that explosive arrangement is completed is installed on outdoor Explosion composite
Place, setting priming device carry out Explosion composite, so that roller set is passed through explosive welding with roller core and are combined together, form composite roll
Base；D) it tests to explosion bond quality；E) to examining qualified roller set and the compound roller stock of roller core to be heat-treated.
In one embodiment, in step a), roller case material can be selected steel alloy, high chrome, high-speed steel or hard and close
Forged steel, structural steel or unimach etc. can be selected in gold etc., roller core material.All of above material can be by explosive welding side
Method carries out compound.Because Explosion composite is exactly to be incorporated in two or more material of different nature by explosive manner
A kind of technique together, it is possible to according to using functional requirement and using position, different bases be selected to roller core and roller set
Material and cladding material.Herein, it selects the roller core of base material to be also referred to as base material, selects the roller of cladding material to cover and also may be used
Referred to as answer material.
In one embodiment, after the step a) and before carrying out step b), can two pairs of rollers set and roller core combination table
Face is pre-processed, and surface roughness Ra≤6.3 μm of the roller set and the roller core are made.
In one embodiment, in step b), when fitting together roller set with roller core, roller is made to cover between roller core
There are certain spacing, and according to material and thickness that roller covers, above-mentioned spacing can be within the scope of 2-8mm.
In one embodiment, in step c), explosive, the thickness of above-mentioned special low explosive are arranged around roller set
It can be covered according to roller and be chosen with the material of roller core and thickness, the thickness of special low explosive can be in 25-120mm.
In one embodiment, it in step d), tests to explosion bond quality using ultrasonic flaw detection,
It is required that Percentage bound reaches 100%.
In one embodiment, in step e), to examining at the compound roller stock heat that qualified roller covers and roller core is combined into
When reason, mid-frequency induction hardening can be carried out, or is warming up to 920 DEG C of -- 1050 DEG C quench and then in 200 DEG C -- 500 in heating furnace
DEG C temper.
It is above-mentioned the present invention also provides composite roll made of a kind of manufacturing method according to explosive welding composite roll above-mentioned
Composite roll includes the outer layer roller set being combined with each other by explosive welding and internal layer roller core, wherein the material selection alloy of roller set
Steel, high chrome, high-speed steel or hard alloy etc., material selection forged steel, structural steel or unimach of roller core etc., above-mentioned institute
There is material and can be carried out by explosion welding method and is compound.
The invention also discloses the purposes of composite roll made of the manufacturing method according to explosive welding composite roll above-mentioned, on
State working roll and support roller that composite roll is applicable to a variety of milling trains and conticaster.
Further, above-mentioned working roll and support roller may include Continuous Casting Rolls, section cooling roller and niproll etc..
Advantageous effect
The manufacturing method of explosive welding composite roll according to the present invention produces composite roll, and production efficiency is high, and roll surface layer is
The original as-rolled condition of material compares overlay cladding, and tissue and hardness are uniform, and weld strength is high, and wearability is good, during use not
Easy scaling, cracking, can improve the quality of stocking and the service life of roller, and application range is wide.
Description of the drawings
Attached drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the present invention
Point, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, does not constitute improper limitations of the present invention.Attached
In figure：
Fig. 1 is the flow chart for the manufacturing method for illustrating the explosive welding composite roll according to embodiment of the present invention；And
Fig. 2 is to illustrate the composite roll that can be used in the manufacturing method according to the explosive welding composite roll of embodiment of the present invention
Roller explosive welding assembling schematic diagram.
Reference sign
A) step is indicated；B) step is indicated；C) step is indicated；D indicates step；E) step is indicated；
1 indicates roller core；2 indicate roller set；3 indicate roller core inner cavity；4 indicate gap；5 indicate explosive；6 indicate air hole；7 tables
Show detonator；8 indicate flange upper cover；9 indicate flange base；10 indicate bottom plate.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with several specific implementations of the present invention
Technical solution of the present invention is clearly and completely described in example and corresponding attached drawing.Obviously, described embodiment is only this hair
Bright a part of the embodiment, instead of all the embodiments.Based on the embodiment of the present invention, those of ordinary skill in the art are not having
There is all other embodiment obtained under the premise of making creative work, shall fall within the protection scope of the present invention.In addition it also needs
It is noted that illustrating only for ease of description, in attached drawing and inventing relevant part.
Note that numberical range used herein includes each value within the scope of this, and for avoiding that the model must be enumerated
Enclose interior each value.If appropriate, any number within the scope of this can be selected as upper limit value, lower limiting value or the end of the range
Value.
Below in conjunction with attached drawing, the technical solution of embodiment that the present invention will be described in detail offer.
On the one hand, referring to Fig.1, according to an embodiment of the present invention, a kind of manufacturing method of explosive welding composite roll is provided,
It includes：
A) material of outer layer the roller set and internal layer roller core of composite roll is selected according to requirements；
B) above-mentioned roller is covered after being fitted together with above-mentioned roller core, it is fried to be evenly arranged one layer of special low blasting speed outside roller set
Medicine；
C) component of above-mentioned roller set and above-mentioned roller core that explosive arrangement is completed is installed on outdoor Explosion composite place, if
It sets priming device and carries out Explosion composite, so that above-mentioned roller set is passed through together with explosive welding with above-mentioned roller core, form compound roller stock；
D) it tests to explosion bond quality；
E) to examining qualified roller set and the compound roller stock of roller core to be heat-treated.
In step a), outer layer roller case material can typically select steel alloy, high chrome, high-speed steel or hard alloy etc.,
Roller core material can typically select forged steel, structural steel or unimach etc..However, the outer layer roller case material and roller of the application
Core material is not limited to above-mentioned material, and other materials suitable for explosive welding composite roll also can be selected.
In one embodiment, after step a) and before carrying out step b), to above-mentioned roller set and above-mentioned roller core
Mating surface such as is derusted, is ground at the bright and clean pretreatment, and surface roughness Ra≤6.3 μm of roller set and roller core are made.
In one embodiment, in step b), when by above-mentioned roller set with above-mentioned roller core fit together when, make roller set with
There are certain spacing between roller core, and according to material and thickness that roller covers, above-mentioned spacing is within the scope of 2-8mm.
In one embodiment, in step c), explosive, the thickness of above-mentioned special low explosive are arranged around roller set
It is chosen according to the material and thickness of above-mentioned roller set and above-mentioned roller core, the thickness of the special low explosive is typically in the range of 25-
In 120mm.
In one embodiment, it in step d), is tested, to explosion bond quality using ultrasonic flaw detection
Percentage bound is asked to reach 100%.
In one embodiment, in step e), when to examining qualified roller set and the compound roller stock of roller core to be heat-treated, into
Row mid-frequency induction hardening, or 920 DEG C -- 1050 DEG C quench and then in 200 DEG C -- are warming up in heating furnace at 500 DEG C of tempering
Reason.
Hereafter, with reference to Fig. 2, it is compound that explosive welding according to an embodiment of the present invention will be described by taking section cooling roller as an example
The manufacturing method of roller.
Embodiment
Referring to Fig. 2, described by taking the section cooling roller for manufacturing diameter phi 260 as an example.First, can outer layer roller 2 be covered to choose
It is 45 steel by the choice of material of roller core 1 for 0Cr13Ni5Mo, wall thickness 5mm.As previously mentioned, also roller core 1 can be referred to as base material, it will
Outer layer roller set 2 is referred to as material again.
In next step, bright and clean pretreatment is carried out to the mating surface of base material and multiple material.For example, to the combination table of base material and multiple material
Face 100% all carries out derusting grinding, makes surface roughness Ra≤6.3 μm.
In next step, outdoor quick-fried bed is arranged, so that quick-fried bed is above the ground level 300mm, and outer layer roller set 2 and internal layer roller core 1 are assembled
Together, the component and its bottom plate 10 of roller set 2 and roller core 1 quick-fried bed is steadily then placed in hit exactly and keep vertical with quick-fried bed.
In an example of the invention, as shown in Fig. 2, outer layer roller set 2 and internal layer roller core 1 can for example pass through 8 He of flange upper cover
Flange base 9 is set in together, and certain gap 4 is equipped between outer layer roller set 2 and internal layer roller core 1.Specifically, on flange
Lid 8 all seals one end of outer layer roller set 2 and internal layer roller core 1, and in the other end, flange base 9 only covers internal layer roller core 1, do not seal
Lid outer layer roller set 2, does not cover gap 4 yet.The bottom surface of outer layer roller set 2 is flushed with the bottom surface of flange base 9.
Note that when assembling base material with multiple material, there must be certain spacing between base material and multiple material, to prevent base material
Pipe surface is contacted with the inside pipe wall of multiple material.According to the material and thickness of multiple material, the spacing between base material and multiple material typically ranges between
Within the scope of 2-8mm.
For this purpose, the present invention is provided with fulcrum between base material and multiple material, to keep the spacing between base material and multiple material.Example
Such as, the fulcrum between base material and multiple material selected to the aluminium wire of a diameter of 2mm, 3mm or 4mm, each fulcrum according to multiple material and base material it
Between gap 4 put, between base material and multiple material everywhere in clearance distance must keep equal and within the scope of 2-8mm, prevent base
The pipe surface of material is contacted with the inside pipe wall of multiple material.
Then, outer layer roller set 2 and the component of internal layer roller core 1 after can assembling are fixed on bottom plate 10, and by bottom plate 10
Quick-fried bed is placed on to hit exactly and keep vertical with quick-fried bed.The diameter of bottom plate 10 is more than the diameter of outer layer roller set 2.
In next step, explosive is laid, and connects priming device, keeps roller set compound with roller core explosive welding, forms compound roller stock.
Specifically, by the component of outer layer roller set 2 and internal layer roller core 1 is lived for housing the transdermal barrel cover of explosive 5, and install
On bottom plate 10.For example, putting the wooden fulcrum on the circumference of multiple material bottom to support transdermal cylinder, ensure surrounding explosive height one
It causes.
Other than 10 side of bottom plate, there are certain gap between the other inner walls and outer layer roller of above-mentioned transdermal cylinder set 2, with
Just explosive 5 is arranged in above-mentioned gap.For example, all cloth in gap between roof and side wall and outer layer the roller set 2 of transdermal cylinder
Set the explosive 5 of 50mm thickness.Bottom plate 10 is at the circumferential section in the gap 4 between outer layer roller set 2 and internal layer roller core 1,
It is even to be disposed with one or more air holes 6.
Explosive 5 is inserted in transdermal cylinder, detonator 7 is then connected.For example, detonator 7 to be placed in the component 12 of roller set and roller core
Top detonate.
Next, the detonation that is powered, makes base material and multiple material Explosion composite.
In next step, the compound roller stock formed after Explosion composite using ultrasonic flaw detection instrument, two pairs of rollers set and roller core
Explosion bond quality is tested, it is desirable that Percentage bound 100%.
Finally, qualified compound roller stock will be examined to be warming up to 1050 DEG C of quenchings in heating furnace, keeps the temperature 10-15min, wind
It is cold；Then 6h is kept the temperature in 200 DEG C of tempers, it is air-cooled, so that composite roll case hardness is reached HRC40-50.
In another aspect, according to another embodiment of the present invention, a kind of system according to explosive welding composite roll above-mentioned is provided
Make composite roll made of method, above-mentioned composite roll includes the outer layer roller set being combined with each other by explosive welding and internal layer roller core,
Wherein, above-mentioned outer layer roller set material therefor can select steel alloy, high chrome, high-speed steel or hard alloy etc., above-mentioned internal layer roller
Core material therefor can select forged steel, structural steel or unimach etc., all of above material that can pass through explosion welding method
It carries out compound.
On the other hand, another embodiment of the present invention instantiates manufacturer's legal system according to explosive welding composite roll above-mentioned
At composite roll purposes, above-mentioned composite roll is suitable for working roll and support roller of a variety of milling trains and conticaster etc. etc..
In an embodiment of the present invention, above-mentioned working roll and support roller include but not limited to Continuous Casting Rolls, section cooling roller, with
And niproll etc..
Although the numerous embodiments of the present invention are foregoing described, it will be appreciated by those skilled in the art that the above embodiment
Only it is used for explaining the present invention, and not limits to the present invention.It in embodiments of the present invention, can also be according to the need of actual use
It wants, change the size or material of the components such as roller set, roller core, or change explosive kind or overbreak mode etc..Moreover, the present invention is compound
The application of roller includes but not limited to Continuous Casting Rolls and section cooling roller etc..
It should be noted that herein, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or equipment including a series of elements includes not only those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or equipment institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including institute
State in the process, method, article or equipment of element that there is also other identical elements.In addition, "front", "rear" herein,
"left", "right", "upper", "lower" are using the placement status indicated in attached drawing as reference.
Finally, it will be understood by those skilled in the art that in the case where not departing from the spirit and scope of technical solution of the present invention,
The present invention can be carry out various modifications, substituted or changed, and these modifications, replacement or change still fall within the protection of the present invention
In range and its equivalency range.
Claims (10)
1. a kind of manufacturing method of explosive welding composite roll comprising：
A) material of outer layer the roller set and internal layer roller core of the composite roll is selected according to requirements；
B) roller is covered after being fitted together with the roller core, it is fried to be evenly arranged one layer of special low blasting speed outside roller set
Medicine；
C) component of roller set and the roller core that explosive arrangement is completed is installed on outdoor Explosion composite place, be arranged
Quick-fried device carries out Explosion composite, so that the roller set is passed through explosive welding with the roller core and is combined together, forms compound roller stock；
D) it tests to explosion bond quality；
E) to examining qualified roller set and the compound roller stock of the roller core to be heat-treated.
2. the manufacturing method of explosive welding composite roll as described in claim 1, which is characterized in that in step a), the roller
Cover material selects steel alloy, high chrome, high-speed steel or hard alloy, the roller core material selection forged steel, structural steel or superelevation
Strength steel.
3. the manufacturing method of explosive welding composite roll as described in claim 1, which is characterized in that after the step a) and into
Before row step b), the mating surface of roller set and the roller core is pre-processed, makes the roller set and the roller core
Surface roughness Ra≤6.3 μm.
4. the manufacturing method of explosive welding composite roll as described in claim 1, which is characterized in that in step b), when by institute
When stating roller set and being fitted together with the roller core, so that the roller is covered between the roller core, there are certain spacing, according to described
The material and thickness of roller set, the spacing is within the scope of 2-8mm.
5. the manufacturing method of explosive welding composite roll as described in claim 1, which is characterized in that in step c), described
Arrange that explosive, the thickness of the special low explosive are selected according to the material and thickness of roller set and the roller core around roller set
It takes, the thickness of the special low explosive is in 25-120mm.
6. the manufacturing method of explosive welding composite roll as described in claim 1, which is characterized in that in step d), using super
Sound wave nondestructive inspection tests to explosion bond quality, it is desirable that Percentage bound reaches 100%.
7. the manufacturing method of explosive welding composite roll as described in claim 1, which is characterized in that in step e), to examining
When qualified roller set and the compound roller stock of the roller core is heat-treated, mid-frequency induction hardening is carried out, or heat up in heating furnace
-- 1050 DEG C quench and then in 200 DEG C -- 500 DEG C of tempers to 920 DEG C.
8. composite roll made of a kind of manufacturing method of explosive welding composite roll as described in any one of the preceding claims, institute
It includes the outer layer roller set being combined with each other by explosive welding and internal layer roller core to state composite roll, which is characterized in that the roller set
Material selection steel alloy, high chrome, high-speed steel or hard alloy, material selection forged steel, structural steel or the superelevation of the roller core
Strength steel, above-mentioned all material can be carried out compound by explosion welding method.
9. the purposes of composite roll, described made of a kind of manufacturing method of explosive welding composite roll according to claim 8
Composite roll is suitable for the working roll and support roller of a variety of milling trains and conticaster.
10. compound made of the manufacturing method of explosive welding composite roll according to claim 8 as claimed in claim 9
The purposes of roller, which is characterized in that the working roll and support roller include Continuous Casting Rolls, section cooling roller and niproll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810305788.5A CN108581170A (en) | 2018-04-08 | 2018-04-08 | The manufacturing method of explosive welding composite roll, composite roll and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810305788.5A CN108581170A (en) | 2018-04-08 | 2018-04-08 | The manufacturing method of explosive welding composite roll, composite roll and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108581170A true CN108581170A (en) | 2018-09-28 |
Family
ID=63621109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810305788.5A Pending CN108581170A (en) | 2018-04-08 | 2018-04-08 | The manufacturing method of explosive welding composite roll, composite roll and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108581170A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101444794A (en) * | 2008-12-04 | 2009-06-03 | 南京润邦金属复合材料有限公司 | Explosive-welded 3Cr13Mo/42CrMo abrasion resistant and corrosion resistant composite roll |
| CN101502910A (en) * | 2009-03-16 | 2009-08-12 | 王正选 | Explosion welding technology for machining and manufacturing continuous casting roller |
-
2018
- 2018-04-08 CN CN201810305788.5A patent/CN108581170A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101444794A (en) * | 2008-12-04 | 2009-06-03 | 南京润邦金属复合材料有限公司 | Explosive-welded 3Cr13Mo/42CrMo abrasion resistant and corrosion resistant composite roll |
| CN101502910A (en) * | 2009-03-16 | 2009-08-12 | 王正选 | Explosion welding technology for machining and manufacturing continuous casting roller |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102152058B (en) | Surfacing repair method for large cold-rolled supporting roll | |
| CN108608106A (en) | The method for manufacturing composite roll using vacuum state explosion welding technique | |
| CN104924018B (en) | A kind of Large Rotor big cross section crackle field repairing method | |
| CN101444884B (en) | Machining process of engine connecting rod | |
| CN101932737B (en) | An axle from a seamless tube for railroad vehicles, and a process for manufacturing an axle from a seamless steel tube for railroad vehicles | |
| Ebara et al. | Failure analysis of hot forging dies for automotive components | |
| CN102179681B (en) | Pipe mold manufacturing process adopting continuous-casting blank to forge and roll rough blank periodically | |
| EP2028284A1 (en) | High-strength seamless steel pipe for mechanical structure which has excellent toughness and weldability, and method for manufacture thereof | |
| CN102839336B (en) | Heat resistant alloy member, method for manufacturing the same, and method for repairing the same | |
| CN105441789B (en) | Large circular knife and manufacturing method thereof | |
| CN105316621A (en) | Carburization combined assembly structure for planet row transmission gears and heat treatment method | |
| CN104074622B (en) | Piston with integrated steel crown and iron skirt and production method thereof | |
| CN106544488A (en) | Bolt manufacturing method | |
| CN102152081A (en) | Manufacture method of vehicle rocker arm bearing | |
| CN107243695A (en) | A kind of composite engine hollow camshaft laser welding process method | |
| CN108581170A (en) | The manufacturing method of explosive welding composite roll, composite roll and application thereof | |
| CN107964573B (en) | A kind of medium blast furnace furnace shell Replacement procedure | |
| Shi et al. | Research on properties of ductile iron/mild steel joints welded by laser | |
| Tang et al. | Influence of laser shock peening on fatigue performance of LZ50 axle steel for railway wheel set | |
| RU2420380C1 (en) | Method of producing complex-shape axially symmetric welded structure | |
| CN107664036A (en) | A kind of center assembly for connecting shield cutter and cutter plate driver axle | |
| CN109530849B (en) | Welding construction method for carbon steel pipeline in acidic environment | |
| CN104862601A (en) | Low-chromium alloy centrifugal composite cast steel support roller and preparation method thereof | |
| CN205895253U (en) | Novel shield cutterhead and actuating shaft connection's central nested structure | |
| CN205851564U (en) | Hot rolling steekle mill slewing rollers |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180928 |
|
| RJ01 | Rejection of invention patent application after publication |