CN106141562B - The restorative procedure and its prosthetic device in the cellular embedded block inner mold face of engine inner wall - Google Patents
The restorative procedure and its prosthetic device in the cellular embedded block inner mold face of engine inner wall Download PDFInfo
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- CN106141562B CN106141562B CN201610474879.2A CN201610474879A CN106141562B CN 106141562 B CN106141562 B CN 106141562B CN 201610474879 A CN201610474879 A CN 201610474879A CN 106141562 B CN106141562 B CN 106141562B
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- embedded block
- cellular
- pedestal
- stencil master
- cellular embedded
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
- B23P6/045—Repairing fractures or cracked metal parts or products, e.g. castings of turbine components, e.g. moving or stationary blades, rotors, etc.
Abstract
The present invention proposes the restorative procedure and its prosthetic device in a kind of cellular embedded block inner mold face of engine inner wall, can significantly improve control accuracy using the present invention, reduce labor intensity, improve processing efficiency.The technical scheme is that：Design size and required precision by the engineering drawing of cellular embedded block process the stencil master of cellular embedded block reconditioning track；Then, with two needle bearing groups for being symmetrical with stencil master central axis, it is supported on the both ends of arcwall face below stencil master, stencil master is connected firmly again on the rocking arm on the transmission mechanism of cellular embedded block inner mold face prosthetic device, stencil master does cycloid motion between two support needle bearing groups by reconditioning track, cellular embedded block moves with clamping device and does relative swing with milling cutter tip, the movement of standard embedded block inner mold face is done according to amplification standard embedded block track, profile milling is carried out to cellular embedded block inner mold face.
Description
Technical field
It is (following logical the present invention relates to a kind of cellular embedded block of aero-engine high-pressure turbine radial clearance control device
Claim " cellular embedded block ") inner mold face restorative procedure and its device.
Background technology
When aero-engine carries out big state (maximum, reinforcing is when states) work, high-pressure turbine blade tip and turbine casing
Gas leakage between inner wall can reduce the working efficiency of high-pressure turbine.Stablize the aeroplane engine of densification device using radial clearance
Machine, when carrying out big work status, the radial drawing under heat and centrifugal force effect of high-pressure turbine disk and blade, and then reduce diameter
To gap and air leakage, high-pressure turbine working efficiency is improved.When leaf elongation and cellular 2 brought into incidental contact of embedded block, preferentially
Cellular embedded block 2 is made to generate abrasion, vane tip is avoided to damage.The radial clearance of aero-engine inner wall shown in Fig. 4 stablizes envelope
The tight cellular embedded block 2 of device is by more than one piece annulus, with parts groups such as the fixed cellular embedded block 2 of radial direction pin, thermal insulation boards
Into loop component.
The cellular embedded block 2 of engine inner wall is in high temperature, high-speed fuel gas washes away, high relative velocity touches the poles harsh environments such as mill
Middle work.Its major failure form has inner mold surface wear, thermal deformation, crackle, chip off-falling etc..Overproof inner mold surface wear is cellular embedding
Enter the main of block 2 and scrap one of reason.23 section physical characteristic of part inner mold face, the geometric properties all same, external surface Fig. 5
Shown honeycomb structure slot structure 24, inner mold face are circumferential multiple row equidistantly comb tooth protrusion, and shape is more complicated, restores extremely difficult.Mesh
Preceding common complete machine troubleshooting method is to replace cellular embedded block, but frequently replacing cellular embedded block new product can greatly improve
Purchase cost, while postponement production progress can be influenced by procurement cycle.The restorative procedure generally used in production at present, being will be interior
The overproof cellular embedded block collection of type surface wear it is neat it is complete after, be spliced into the domain, the inner mold face comb tooth milling for wearing overproof gone
It removes, spreading is carried out, then after the milling of built-up welding region is put down to inner mold face using extraordinary technique for overlaying, inner mold face comb tooth is processed, realizes
The reparation of cellular embedded block.By the way of the domain is spliced, the clamping tooling size needed is larger, the positioning method of tooling
It is more complicated with mode of operation；Need collection part complete during the domain is spliced, however the overproof journey of monolithic honeycomb shape embedded block
Degree and milling depth require randomness, and the wasting of resources can be caused by being repaired using the collection complete mode of part；Simultaneously task quantity with
Machine is big, and this method flexibility is low, there is a possibility that drag slow manufacturing schedule, while improves the probability that more parts mix platform.
Cellular embedded block is the important part of aero-engine, and manufacturing process is complicated, of high cost, and Service Environment is severe
Category is easily scrapped.It realizes that embedded block inner mold face is restored using specific aim device, is to reduce the effective way scrapped.It is also to improve simultaneously
Efficiency is repaired, reduces labor intensity effective measures.
Invention content
The goal of the invention of the present invention is that provide a kind of rehabilitation cost there are problem for the above-mentioned prior art low, efficient,
Cellular embedded block can be reduced to repair scrappage, reduce labor intensity, improve the honeycomb for repairing processing efficiency and control accuracy
Shape embedded block inner mold face restoration methods and its device.
Scheme is used by the present invention solves its technical problem, a kind of cellular embedded block inner mold face of engine inner wall
Restorative procedure, it is characterised in that include the following steps：It is fixed according to the inside and outside type face of the cellular embedded block of engine inner wall for radius
The concentric circles segmental arc condition identical with different cross section physical form, geometric properties；By the cellular embedded block 2 for corresponding to type
The design size of engineering drawing and required precision process the stencil master 13 of cellular 2 reconditioning track of embedded block；Then, it uses
Two needle bearing groups 3 of 13 central axis of stencil master are symmetrical with, are supported on the both ends of 13 lower section arcwall face of stencil master, then
Stencil master 13 is connected firmly on the rocking arm 12 on the transmission mechanism 4 of cellular embedded block inner mold face prosthetic device, it is cellular embedding
Enter block 2 and be fixed on 7 top of clamping device, rocking arm 12 drives stencil master 13 to move by transmission mechanism 4, controls stencil master 13
The cambered surface of forming movement track, stencil master 13 do cycloid motion, bee between two support needle bearing groups 3 by reconditioning track
Nest shape embedded block 2 moves with clamping device 7 and does relative swing with milling cutter tip 1, is marked according to amplification standard embedded block track
Quasi- embedded block inner mold face movement, profile milling is carried out to cellular 2 inner mold face of embedded block.
The present invention has the advantages that compared with the prior art.
The present invention is using profile modeling, and amplification milling track, using the stencil master 13 of cellular embedded block 2, foundation is put
Big standard embedded block track carries out profile milling to embedded block inner mold face, and cost of manufacture is cheap, easy to operate.Pass through stencil master
13 drive cellular embedded block 2 to do the movement of standard embedded block inner mold face, improve control accuracy；By transmission mechanism 4, operation is reduced
Person's labor intensity improves processing efficiency.
The present invention fastens two postive stop baffles 8 by the pedestal both ends of prosthetic device by bolt, by adjusting postive stop baffle 8
On caging bolt, the amplitude of fluctuation of stencil master 13 can be limited.
Experiment shows cellular embedded block Precision Machining can be made to be no longer limited to splicing cyclization using the present invention, reduce
The wasting of resources caused by milling depth difference using the profile milling fixture of cellular embedded block, improves production effect
Rate improves the stability of product quality, improves the flexibility of reply production task；Meanwhile make cellular embedded block reparation
Supportability is effectively promoted.
Description of the drawings
Fig. 1 is the profile milling schematic diagram of the cellular embedded block inner mold face prosthetic device of the present invention.
Fig. 2 is the organigram of honeycomb of engine shape embedded block inner mold face prosthetic device designed according to Fig. 1 principles.
Fig. 3 is the organigram of cellular embedded block clamping device.
Fig. 4 is cellular embedded block schematic diagram.
Fig. 5 is the A-A of Fig. 4 to partly enlarged top view.
In figure：1 milling cutter tip, 2 cellular embedded blocks, 3 needle bearing groups, 4 transmission mechanisms, 5 profiling cambered surfaces, 6 position restrainers
Structure, 7 clamping devices, 8 postive stop baffles, 9 racks, 10 gear shafts, 11 pedestals, 12 rocking arms, 13 stencil masters, 14 caging bolts, 15
Hex bolts, upside axial baffle after 16,17 upper left side circumferential direction pressing plates, the 18 tight bolts of the back of the body, 19 upper right side circumferential direction baffles, before 20 on
Side axle is to pressing plate, 21 pedestals, 22 compression springs, 23 inner mold faces, 24 honeycomb structure slot structures.
Specific embodiment mode
Refering to Fig. 1, Fig. 2.In embodiment described below, the present invention according in the cellular embedded block of engine inner wall,
The outer mold surface condition identical with different cross section physical form, geometric properties for the fixed concentric circles segmental arc of radius；By corresponding type
Cellular embedded block 2 engineering drawing design size and required precision, process the imitative of cellular 2 reconditioning track of embedded block
Shape template 13.For being repaired below by cellular embedded block inner mold face, cellular 2 any dot thickness of embedded block shown in Fig. 4, Fig. 5
All same, inner mold face 23 and outer mold surface are concentric, the fixed standard arc section of radius, part different cross section physical form, geometry
Feature is identical.First, micron order measurement is made to standard honeycomb embedded block using three-coordinates measuring machine, makes embedded block reconditioning rail
Secondly the stencil master 13 of mark, using profile modeling, standard polishing track through profiling is amplified, can obtain stencil master 13
The forming movement track cambered surface of reconditioning.With the needle bearing group 3 and the control stencil master of transmission mechanism 4 of two center axis of symmetry
13 forming movement tracks, then, two needle bearing groups 3 for being symmetrical with 13 central axis of stencil master with two are supported on imitative
The both ends of 13 lower section arcwall face of shape template, then stencil master 13 is connected firmly into the transmission mechanism 4 in embedded block inner mold face prosthetic device
On rocking arm 12 on, cellular embedded block 2 is fixed on 7 top of clamping device, and rocking arm 12 passes through transmission mechanism 4 and drives stencil master
13 movements, the cambered surface of 13 forming movement track of control stencil master, stencil master 13 are pressed between two support needle bearing groups 3
Cycloid motion is done in reconditioning track, and cellular embedded block 2 does relative swing with the milling cutter tip 1 on clamping device 7, according to amplification mark
The movement of standard embedded block inner mold face is done in quasi- embedded block track, and profile milling is carried out to cellular 2 inner mold face of embedded block.
In fig. 2, the prosthetic device main body of cellular embedded block includes being fixed on the feeler mechanism of pedestal 11, positioned at profiling
The position-limit mechanism 6 at mechanism both ends and the transmission mechanism 4 for connecting firmly stencil master 13.Wherein, feeler mechanism includes being formed with profiling cambered surface 5
Stencil master 13 and the clamping device 7 and axial symmetry that connect firmly in 13 plate end upper side of stencil master be distributed on 11 riser of pedestal
Two needle bearing groups 3；Position-limit mechanism 6 includes symmetrically being fixed on the postive stop baffle 8 at 11 both ends of pedestal and is arranged on the limit
Caging bolt 14 on the 8 both sides vertical plane of baffle of position, postive stop baffle 8 are solid by the hex bolts 15 along 11 length direction of pedestal
It is associated on the both sides of the face of pedestal 11.Transmission mechanism 4 includes, rack 9 below 13 profiling cambered surface of stencil master and with institute
It states 9 meshed gears axis 10 of rack and is positioned on 11 rear side riser of pedestal, close to the rocking arm 12 of clamping device 7.By repairing
The pedestal both ends of apparatus for coating fasten two postive stop baffles 8 by bolt, by adjusting the caging bolt on postive stop baffle 8, can limit
The amplitude of fluctuation of stencil master 13 processed.
Stencil master 13 is formed by the limiting of gear shaft 10 and needle bearing group 3 between the twice riser of pedestal 11
The axial limiting with radial direction, clamping device 7 are fastened on by turnbuckle on stencil master 13.When external force shakes tooth connection wheel shaft
During 10 rocking arm 12, by the engaged transmission of gear shaft 10 and rack 9, transmit torque on stencil master 13.Work as profile mould
Plate is by the limiting of gear shaft 10 and needle bearing group 3, and when carrying out circuit oscillation along forming movement path, clamping device 7 tightens
Solid cellular embedded block 2 be also driven therewith and do profiling circuit oscillation back and forth, movement locus just with cellular insertion
Block inner mold face is consistent.
Refering to Fig. 3.The main body of clamping device 7 includes connecting firmly the rear upside axial baffle in 21 cube back side top of pedestal
16, the upper left side circumferential direction pressing plate 17 in 21 cube left end face of pedestal connects firmly the top on the right side of 21 cube of pedestal
Upper right side circumferential direction baffle 19 and positioned at the front upper side axial direction pressing plate 20 in cube front side top.Wherein, rear upside axial baffle
16 and upper right side circumferential direction baffle 19 be fixed plate, to ensure in assembling, rear upside 16 internal face of axial baffle with it is cellular
The contact surface of embedded block 2 is mutually perpendicular to, and is anchored on 21 cube of pedestal using bolt, ensures no longer to loosen during use,
And it no longer dismantles；Upper left side circumferential direction pressing plate 17 is movable pressing board, passes through the tight bolt 18 of the back of the body being connected on the left of 21 cube of pedestal
The back of the body is tight, while is compressed with 22 phase of compression spring on the left of 21 cube of pedestal；Front upper side axial direction pressing plate 20 is movable pressing board, is provided on plate
Strip through-hole can move up and down 20 opposite base 21 of front upper side axial direction pressing plate, by the way that strip through-hole is passed through to be connected to
The bolt back of the body on front side of 21 cube of pedestal is tight.
When cellular embedded block 2 is installed, cellular embedded block 2 is placed on pedestal 21, make cellular embedded block 2 with it is rear on
Side axial baffle 16 and the lateral baffle 19 of upper right contact compression gapless simultaneously；At this point, rear upside axial baffle 16 limits bee
The axial position of nest shape embedded block 2, the lateral baffle 19 of upper right limit the axial position of cellular embedded block 2.
Front upper side axial direction pressing plate 20 is pushed into extreme higher position along strip through-hole, and makes the inner wall of front upper side axial direction pressing plate 20
Face pushes against cellular 2 axial end face of embedded block；The bolt of strip through-hole is driven through, reduces front upper side axial direction pressing plate 20 with after
The distance of upside axial baffle 16 realizes the axial compression of cellular 2 front and rear sides of embedded block.It is circumferential by being driven through left side
The tight bolt 18 of the back of the body of pressing plate 17 compresses the compression spring 22 on the left of 21 cube of pedestal, reduces upper left side circumferential direction pressing plate 17 and upper right side
The distance of circumferential baffle 19 realizes circumferential the compressing of cellular 2 left and right sides of embedded block.
When carrying out embedded block repairing, need cellular embedded block inner mold face prosthetic device being anchored on milling machine guide rail first
On, by cellular embedded block 2 clamping fastener on clamping device 7 to be repaired.Secondly, to pass through scale and measure calibration, by milling cutter knife
The minimum tangent position in the first cellular 2 inner mold face of embedded block of 1 alignment, milling amount and precision according to needed for processing, to milling machine into
Row is accurately presetting.Finally, when milling cutter tip 1 carries out milling to the inner mold face of cellular embedded block 2, by repeatedly along (inverse)
Hour hands shake rocking arm 12, make stencil master 13 that cellular embedded block 2 be driven to swing repeatedly, and inner mold face is made circumferentially to process everywhere
It arrives.
After the completion of repairing, milling cutter tip 1 is lifted, turn rocking arm 12 makes clamping device 7 return back to center, negative direction rotation
The dynamic tight bolt 18 of the back of the body, makes left side be detached to pressing plate 17 from the end face of cellular embedded block 2, releases circumferential clamping；Negative direction turn
Tight bolt is carried on the back, axial pressing plate 20 is made to drop to extreme lower position, axial clamping is released, removes cellular embedded block 2.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all originals in the present invention
All any modification, equivalent and improvement made within then etc., alternatively, should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of restorative procedure in the cellular embedded block inner mold face of engine inner wall, it is characterised in that include the following steps：It prepares
One includes connecting firmly in pedestal（21）The rear upside axial baffle of cube back side top（16）, positioned at pedestal（21）Cube is left
Upper left side circumferential direction pressing plate on side end face（17）, connect firmly in pedestal（21）The upper right side circumferential direction baffle of top on the right side of cube（19）
With positioned at the front upper side axial direction pressing plate in cube front side top（20）, front upper side axial direction pressing plate（20）For movable pressing board, on plate
Strip through-hole is provided with, makes front upper side axial direction pressing plate（20）Opposite base（21）It moves up and down, by the way that strip through-hole is passed through to connect
It is connected to pedestal（21）The bolt back of the body on front side of cube is tight, forms clamping device（7）；According to the cellular embedded block of engine inner wall
The inside and outside type face condition identical with different cross section physical form, geometric properties for the fixed concentric circles segmental arc of radius；By corresponding machine
The cellular embedded block of type（2）Engineering drawing design size and required precision, process cellular embedded block（2）Reconditioning rail
The stencil master of mark（13）；Then, with being symmetrical with stencil master（13）Two needle bearing groups of central axis（3）, it is supported on
Stencil master（13）The both ends of lower section arcwall face, then by stencil master（13）It connects firmly in cellular embedded block inner mold face prosthetic device
Transmission mechanism（4）On rocking arm（12）On；Cellular embedded block（2）It is fixed on clamping device（7）Top, clamping device（7）
Stencil master is fastened on by turnbuckle（13）On, cellular embedded block is installed（2）When, by cellular embedded block（2）It is placed in
Pedestal（21）On, make cellular embedded block（2）With rear upside axial baffle（16）With the lateral baffle of upper right（19）Contact pressure simultaneously
Tight gapless, rear upside axial baffle（16）Limit cellular embedded block（2）Axial position, the lateral baffle of upper right（19）Limitation
Cellular embedded block（2）Axial position；By front upper side axial direction pressing plate（20）Extreme higher position is pushed into along strip through-hole, and before making
Upside axial direction pressing plate（20）Internal face push against cellular embedded block（2）Axial end face；The bolt of strip through-hole is driven through,
Reduce front upper side axial direction pressing plate（20）With rear upside axial baffle（16）Distance, realize cellular embedded block（2）Front and rear sides
Axial compression；By being driven through the circumferential pressing plate in left side（17）The tight bolt of the back of the body（18）, compress pedestal（21）On the left of cube
Compression spring（22）, reduce upper left side circumferential direction pressing plate（17）With upper right side circumferential direction baffle（19）Distance, realize cellular embedded block
（2）The circumferential of the left and right sides compresses, rocking arm（12）Pass through transmission mechanism（4）Drive stencil master（13）Movement controls profile mould
Plate（13）The cambered surface of forming movement track, stencil master（13）Needle bearing group is supported at two（3）Between done by reconditioning track
Cycloid motion, cellular embedded block（2）With clamping device（7）Movement and and milling cutter tip（1）Relative swing is done, according to amplification mark
The movement of standard embedded block inner mold face is done in quasi- embedded block track, to cellular embedded block（2）Inner mold face carries out profile milling.
2. the restorative procedure in the cellular embedded block inner mold face of engine inner wall as described in claim 1, it is characterised in that：Profiling
Template（13）Pass through gear shaft（10）With needle bearing group（3）Limiting, in pedestal（11）Twice riser between formed it is axial
With the limiting of radial direction.
3. the restorative procedure in the cellular embedded block inner mold face of engine inner wall as described in claim 1, it is characterised in that：When outer
Power shakes tooth connection wheel shaft（10）Rocking arm（12）When, pass through gear shaft（10）With rack（9）Engaged transmission, torque is transmitted
To stencil master（13）On.
4. the restorative procedure in the cellular embedded block inner mold face of engine inner wall as claimed in claim 1 or 2, it is characterised in that：
When stencil master is by gear shaft（10）With needle bearing group（3）Limiting, along forming movement path carry out circuit oscillation when, folder
Hold mechanism（7）The cellular embedded block of upper fastening（2）Also it is driven therewith and does profiling circuit oscillation back and forth, movement locus is proper
It is good to be consistent with cellular embedded block inner mold face.
5. a kind of prosthetic device using claim 1 the method, including being fixed on pedestal（11）Feeler mechanism, positioned at imitative
The position-limit mechanism at shape mechanism both ends（6）With connect firmly stencil master（13）Transmission mechanism（4）, which is characterized in that feeler mechanism packet
It includes and is formed with profiling cambered surface（5）Stencil master（13）With connect firmly in stencil master（13）The clamping device of plate end upper side（7）With
Axial symmetry is distributed in pedestal（11）Two needle bearing groups on riser（3）.
6. prosthetic device as claimed in claim 5, which is characterized in that position-limit mechanism 6 includes symmetrically being fixed on pedestal（11）Two
The postive stop baffle at end（8）Be arranged on the postive stop baffle（8）Caging bolt on the vertical plane of both sides（14）, postive stop baffle
（8）By along pedestal（11）The hex bolts of length direction（15）It connects firmly in pedestal（11）Both sides of the face on.
7. prosthetic device as claimed in claim 5, which is characterized in that transmission mechanism（4）Including being located at stencil master（13）It is imitative
Rack below shape cambered surface（9）With with the rack（9）Meshed gears axis（10）And it is positioned at pedestal（11）Rear side riser
Upper and close clamping device（7）Rocking arm（12）.
8. prosthetic device as claimed in claim 6, which is characterized in that pedestal both ends fasten two postive stop baffles by bolt（8）,
Adjust postive stop baffle（8）On caging bolt limitation stencil master（13）Amplitude of fluctuation.
9. prosthetic device as claimed in claim 5, which is characterized in that rear upside axial baffle（16）With upper right side circumferential direction baffle
（19）It is fixed plate, rear upside axial baffle（16）The contact surface of internal face and cellular embedded block 2 is mutually perpendicular to, using spiral shell
Bolt is anchored on pedestal（21）On cube.
10. prosthetic device as claimed in claim 9, which is characterized in that upper left side circumferential direction pressing plate（17）For movable pressing board, pass through
It is connected to pedestal（21）The tight bolt of the back of the body on the left of cube（18）The back of the body is tight, while and pedestal（21）Compression spring on the left of cube（22）
Mutually compress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610474879.2A CN106141562B (en) | 2016-06-23 | 2016-06-23 | The restorative procedure and its prosthetic device in the cellular embedded block inner mold face of engine inner wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610474879.2A CN106141562B (en) | 2016-06-23 | 2016-06-23 | The restorative procedure and its prosthetic device in the cellular embedded block inner mold face of engine inner wall |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106141562A CN106141562A (en) | 2016-11-23 |
| CN106141562B true CN106141562B (en) | 2018-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610474879.2A Active CN106141562B (en) | 2016-06-23 | 2016-06-23 | The restorative procedure and its prosthetic device in the cellular embedded block inner mold face of engine inner wall |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111331314A (en) * | 2020-04-20 | 2020-06-26 | 北京易点淘网络技术有限公司 | Screw column cracking repairing method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1003572B (en) * | 1986-09-08 | 1989-03-15 | 重庆长江轮船公司 | Repairing method for crack damage of cast diesel engine block |
| JP4182571B2 (en) * | 1998-10-21 | 2008-11-19 | 東栄技工株式会社 | Cylinder cover bore cool hole repair method |
| CN204019299U (en) * | 2014-08-01 | 2014-12-17 | 中国人民解放军第五七一九工厂 | Engine rotor blade profile prosthetic device |
| CN104369065B (en) * | 2014-08-01 | 2017-01-18 | 中国人民解放军第五七一九工厂 | Engine rotor blade profile restoration method and device |
| CN105598655A (en) * | 2016-03-02 | 2016-05-25 | 华北水利水电大学 | Method for strengthening surface of metal turbine runner blade through combination of electric spark deposition and welding |
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2016
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