CN105834602A - Shock absorber piston rod assembly laser welding tool and method - Google Patents
Shock absorber piston rod assembly laser welding tool and method Download PDFInfo
- Publication number
- CN105834602A CN105834602A CN201610365597.9A CN201610365597A CN105834602A CN 105834602 A CN105834602 A CN 105834602A CN 201610365597 A CN201610365597 A CN 201610365597A CN 105834602 A CN105834602 A CN 105834602A
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- CN
- China
- Prior art keywords
- rod assembly
- piston
- damper piston
- laser welding
- gland
- 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.)
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
Abstract
The invention discloses a shock absorber piston rod assembly laser welding tool which comprises a bearing framework and a base. The bearing framework comprises a cross beam and stepped upright columns used for supporting the cross beam above the base. A hydraulic oil cylinder is arranged on the cross beam, a pressing sleeve is arranged on the stepped upright columns, and the hydraulic oil cylinder drives the pressing sleeve to move up and down along the stepped upright columns. A laser device is arranged on the pressing sleeve. A thrust bearing is embedded in the middle of the pressing sleeve. The base is internally provided with a positioning installation mechanism used for positioning and driving a shock absorber piston rod assembly to rotate. The positioning installation mechanism comprises a fixed sleeve, a floating sleeve and a spring set, the fixed sleeve is installed in the base through a bearing, the floating sleeve is located in the fixed sleeve, and the spring set is arranged between the fixed sleeve and the floating sleeve. The shock absorber piston rod assembly to be welded is located below the pressing sleeve and installed in the floating sleeve. The welding tool has the functions of positioning and clamping the piston rod assembly and driving the piston rod assembly to rotate and also has the axial height dimensional tolerance compensation capacity.
Description
Technical field
The invention belongs to laser welding field, be specifically related to a kind of laser welding frock for damper piston-rod assembly and
Method.
Background technology
On the basis of guaranteeing welding quality, for improving piston-rod assembly Automation of Welding degree, and improve work efficiency, it is desirable to
The focal position of the sent laser of laser instrument is constant, and both its axial height was certain；Simultaneously as require welding back piston bar assembly
In recovery constraint seat to piston, restore sheet, the circulation parts such as sheet, spring leaf, adjustment pad, planchet axially have steady
Fixed pressure, it is therefore desirable to form weld seam with recovery constraint seat with piston rod end and determine the height axial location of piston-rod assembly.
Yet with restoring zero, constraint seat, piston, recovery sheet, circulation sheet, spring leaf, adjustment pad, planchet and piston rod etc.
There is axial dimension tolerance in part, it is therefore desirable to welding tooling is except having location, clamping, drive the functions such as piston-rod assembly rotation
Outward, in addition it is also necessary to there is the ability that axial height dimensional tolerance compensates.
Summary of the invention
The purpose of the invention is to provide a kind of laser welding frock for damper piston-rod assembly, answering by groups of springs
With, compensate the impact that on damper piston-rod assembly, some parts axial dimension accumulations of error cause, it is achieved laser welding focus
Position is the most constant, meets that to restore constraint seat stable to related components axial compressive force simultaneously, and have simultaneously location, clamping,
Drive the functions such as piston-rod assembly rotation.
The technical scheme that the invention uses is:
A kind of damper piston-rod assembly laser welding frock, has load-bearing frame and base (1), and described load-bearing frame includes
Crossbeam (16) and for crossbeam (16) being supported on the ladder column (14) of base (1) top；Crossbeam sets on (16)
Having hydraulic jack (15), ladder column (14) to be provided with gland (13), hydraulic jack (14) drives gland (13) edge
Ladder column (14) moves up and down；Equipped with laser instrument (11) on gland (13)；The middle part of gland (13) is embedded with thrust
Bearing (10)；
The location and installation mechanism for positioning and drive damper piston-rod assembly (9) to rotate, institute it is provided with in described base (1)
State the fixed cover (2) that location and installation mechanism includes being arranged in base (1) by bearing (3), be positioned at fixed cover (2)
Floating bushing (4), and the groups of springs (5) being arranged between fixed cover (2) and floating bushing (4)；Vibroshock to be welded
Piston-rod assembly (9) is positioned at gland (13) lower section, is arranged in floating bushing (4), thrust bearing (10) and bearing
(3) make damper piston-rod assembly (9) realize non-resistance in welding to rotate.
Described a kind of damper piston-rod assembly laser welding frock, described location and installation mechanism also includes gear ring (7), institute
State gear ring (7) and be arranged on the upper end of fixed cover (2), drive fixed cover (2), floating bushing (4), spring by gear ring
Group (5) and damper piston-rod assembly (9) synchronous axial system.
Described a kind of damper piston-rod assembly laser welding frock, described location and installation mechanism also includes adjusting sleeve (6),
Damper piston-rod assembly (9) is arranged in floating bushing (4) by adjusting sleeve (6).
Described a kind of damper piston-rod assembly laser welding frock, described groups of springs (5) is zero stiffness butterfly spring group
(5)。
Described a kind of damper piston-rod assembly laser welding frock, described location and installation mechanism also includes spacing inner ring Clip Reed
(8), described spacing inner ring Clip Reed (8) is arranged on inside the top of fixed cover (2).
Described a kind of damper piston-rod assembly laser welding frock, described gland (13) be respectively provided on two sides with linear bearing
(12), described gland (13) is arranged on ladder column (14) by linear bearing (12), and with linear bearing
(12) it is guide.
Described a kind of damper piston-rod assembly laser welding frock, described ladder column (14) is divided into guide pillar part and support
Post part, the external diameter of described guide pillar part is less than support column part, and described gland (13) is arranged in guide pillar part.
Described a kind of damper piston-rod assembly laser welding frock, described damper piston-rod assembly (9) has piston rod
(9.1), piston rod (9.1) is sequentially provided with recovery constraint seat (9.5) along its axial direction, restores sheet (9.4), suit
There are the piston (9.2) of piston ring (9.3), circulation sheet (9.6), spring leaf (9.7), adjust pad (9.8) and planchet
(9.9)；Described recovery constraint seat (9.5) is axially stepped annular along it, and described recovery constraint seat (9.5) is sleeved on piston
Non-user end both piston ends of bar, need to use laser welding mode to link together with piston rod, by restoring constraint seat
(9.5) circulation sheet (9.6), spring leaf (9.7), adjustment pad (9.8) and planchet (9.9) are implemented axial constraint also
Apply axial precompression.
A kind of damper piston-rod assembly method for laser welding, utilizes above-mentioned a kind of damper piston-rod assembly laser welding frock；
First damper piston-rod assembly (9) to be welded is installed in floating bushing (4) by adjusting sleeve (6)；
Then drive gland (13) to move down along ladder column (14) by hydraulic jack (14) and make thrust bearing (10)
Act on recovery constraint seat (9.5) of damper piston-rod assembly；
In the case of finally both laser focal is constant at guarantee laser instrument (11) invariant position, drive location by gear ring (7)
Installing mechanism and damper piston-rod assembly (9) synchronous axial system, open laser instrument (11) complete restore constraint seat (9.5) with
Welding between piston rod (9.1).
Described method, the size of described damper piston-rod assembly to be welded (9) is L0Its scale error is Δ L0, spring
The camber of spring of group (5) is f1—f2Section i.e. amount of elastic deformation is Δ f；Then Δ L0Δ L need to be met with Δ f0<Δf。
The invention provides the benefit that:
A kind of laser welding frock for damper piston-rod assembly of the invention, has location the most simultaneously, clamps, carries
Outside the functions such as dynamic piston-rod assembly rotation, also there is the welding tooling of axial height dimensional tolerance compensation ability.Utilize this frock both
Piston-rod assembly Automation of Welding degree can be improved, and improve work efficiency, restore constraint seat after being capable of again welding to work
The parts such as plug, recovery sheet, circulation sheet, spring leaf, adjustment pad, planchet axially have stable pressure, laser simultaneously
Device focal length is constant.
In use, zero stiffness butterfly spring group applies stable pressure F to piston-rod assembly all the time in the invention0, and be not subject to
Size L of piston-rod assembly0The scale error Δ L existed0Impact；Piston-rod assembly is executed by zero stiffness butterfly spring group simultaneously
The steady pressure F added0All the time piston-rod assembly is pressed on thrust bearing, and the axial height size of thrust bearing depends on rank
The size of cascaded surface on ladder column, thereby, it is ensured that the distance between laser head and weld seam is constant, both laser focal was constant.So i.e.
Can ensure that welding quality, piston-rod assembly Automation of Welding degree can be improved again, and improve work efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the invention a kind of damper piston-rod assembly laser welding frock.
Fig. 2 is the structural representation of damper piston-rod assembly 9 shown in Fig. 1.
Fig. 3 is zero stiffness butterfly spring elastic characteristic curve.
Wherein 1-base, 2-fixed cover, 3-bearing, 4-floating bushing, 5-combines butterfly spring, 6-adjusting sleeve, 7-gear ring, and 8-limits
Position inner ring Clip Reed, 9-piston-rod assembly, 10-thrust bearing, 11-laser instrument, 12-linear bearing, 13-gland, 14-ladder
Column, 15-hydraulic jack, 16-crossbeam, 9.1-piston rod, 9.2-piston, 9.3-piston ring, 9.4-restores sheet, and 9.5-restores about
Bundle seat, 9.6-circulates sheet, and 9.7-spring leaf, 9.8-adjusts pad, 9.9-planchet.
Detailed description of the invention
Damper piston-rod assembly 9 the most to be welded has piston rod 9.1, along its axial direction on piston rod 9.1
It is sequentially provided with recovery constraint seat 9.5, recovery sheet 9.4, is set with the piston 9.2 of piston ring 9.3, circulation sheet 9.6, spring leaf
9.7, pad 9.8 and planchet 9.9 are adjusted；The described constraint seat 9.5 that restores is axially stepped annular along it, described recovery constraint seat
The 9.5 non-user end both piston ends being sleeved on piston rod, need to use laser welding mode to link together with piston rod, by multiple
Circulation sheet 9.6, spring leaf 9.7, adjustment pad 9.8 and planchet 9.9 are implemented axial constraint and apply axially by former constraint seat 9.5
Precompression.
A kind of damper piston-rod assembly laser welding frock, has load-bearing frame and base 1, described load frame as shown in Figure 1
Frame includes crossbeam 16 and for crossbeam 16 is supported on the ladder column 14 above base 1；Crossbeam 16 is provided with hydraulic jack
15, ladder column 14 is provided with gland 13, described gland 13 be respectively provided on two sides with linear bearing 12, described gland 13 leads to
Cross linear bearing 12 to be arranged on ladder column 14.Described ladder column 14 is divided into guide pillar part and support column part, described
The external diameter of guide pillar part is less than support column part, and described gland 13 is arranged in guide pillar part；Equipped with laser instrument on gland 13
11；The middle part of gland 13 is embedded with thrust bearing 10.Hydraulic jack 14 drives gland 13 to move down along ladder column 14
Dynamic, and with linear bearing 12 as guide, it is ensured that the axial height position of the laser instrument being arranged on gland is decided by rank all the time
The stepped surfaces of ladder column.
The location and installation mechanism for positioning and drive damper piston-rod assembly 9 to rotate, described location it is provided with in described base 1
Installing mechanism includes the fixed cover 2 being arranged in base 1 by bearing 3, is positioned at the floating bushing 4 of fixed cover 2, adjusting sleeve
6, spacing inner ring Clip Reed 8, and the groups of springs 5 being arranged between fixed cover 2 and floating bushing 4；Preferably, such as Fig. 2 institute
Showing, fixed cover 2 has staged endoporus, and floating bushing 4 has the staged external form matched with fixed cover 2, groups of springs 5
Between the step surface I and the step surface II of floating bushing 4 staged external form of fixed cover 2 staged endoporus；Preferably, this spring
Group 5 is zero stiffness butterfly spring group 5.Damper piston-rod assembly 9 to be welded is positioned at below gland 13, by adjusting sleeve 6
It is arranged in floating bushing 4, changes different adjusting sleeves 6 and be adapted to the piston-rod assembly that diameter is different.Spacing inner ring Clip Reed
Inside 8 tops being arranged on fixed cover 2.Thrust bearing 10 and bearing 3 make damper piston-rod assembly 9 realize in welding
Non-resistance rotates.Preferably, this location and installation mechanism also includes that gear ring 7, described gear ring 7 are arranged on the upper end of fixed cover 2
Portion, in welding, the constant both laser focal of laser positions are constant, drive fixing by being arranged on the gear ring 7 on fixed cover 2 top
Set 2, floating bushing 4, groups of springs 5, adjusting sleeve 6, spacing inner ring Clip Reed 8 and damper piston-rod assembly 9 synchronous axial system.
A kind of damper piston-rod assembly method for laser welding, utilizes above-mentioned a kind of damper piston-rod assembly laser welding frock pair
Above-mentioned damper piston-rod assembly welds；
First damper piston-rod assembly 9 to be welded is installed in floating bushing 4 by adjusting sleeve 6；
Then driving gland 13 to move down along ladder column 14 by hydraulic jack 14 makes thrust bearing 10 act on vibroshock
The recovery constraint seat 9.5 of piston-rod assembly；
In the case of finally both laser focal is constant at guarantee laser instrument 11 invariant position, drive positioning and mounting by gear ring 7
Structure and damper piston-rod assembly 9 synchronous axial system, open laser instrument 11 and complete to restore between constraint seat 9.5 and piston rod 9.1
Welding.
If the size of damper piston-rod assembly 9 to be welded is L during use0Its scale error is Δ L0, the spring of groups of springs 5
It is deformed into f1—f2Section i.e. amount of elastic deformation is Δ f；Then Δ L0Δ L need to be met with Δ f0<Δf.I.e. by groups of springs 5 and gland
In the middle part of in the of 13, the thrust bearing 10 of setting-in acts on realization recovery constraint seat 9.5 jointly to piston 9.2, recovery sheet 9.4, circulation sheet
9.3, spring leaf 9.7, the adjustment parts such as pad 9.8, planchet 9.9 axially have stable pressure F0, guarantee welding simultaneously
This pressure rear is the most constant.As in figure 2 it is shown, by piston 9.2, restore sheet 9.4, circulation sheet 9.3, spring leaf 9.7, adjustment
Pad 9.8, planchet 9.9 parts and piston rod 9.1 are about the impact of size, size L of damper piston-rod assembly 90
Certainly exist scale error Δ L0, use zero stiffness butterfly spring group 5 can eliminate scale error Δ L0Adverse effect.Such as figure
Shown in 3, zero stiffness butterfly spring has zero stiffness characteristic, and both butterfly spring was deformed into f1—f2Section；Make Δ L0< Δ f and guaranteeing
L as shown in Figure 21And L2It is all higher than zero.Wherein L1For floating bushing 4 lower surface range of activity, it is necessary to be L1>0；L2For
The floating bushing 4 upper surface range of activity limited by spacing inner ring Clip Reed 8, it is necessary to be L2> 0, so guarantee zero stiffness butterfly
The elastic force of spring is F all the time0, i.e. the elastic force of zero stiffness butterfly spring passes to damper piston-rod assembly 9 by floating bushing 4,
And form relative stabilising force F with the thrust bearing 10 on gland 130。
Claims (10)
1. a damper piston-rod assembly laser welding frock, it is characterised in that there is load-bearing frame and base (1), institute
State load-bearing frame and include crossbeam (16) and for crossbeam (16) being supported on the ladder column (14) of base (1) top；
Crossbeam (16) is provided with hydraulic jack (15), and ladder column (14) is provided with gland (13), and hydraulic jack (14) carries
Dynamic pressure set (13) moves up and down along ladder column (14)；Equipped with laser instrument (11) on gland (13)；Gland (13)
Middle part is embedded with thrust bearing (10)；
The location and installation mechanism for positioning and drive damper piston-rod assembly (9) to rotate, institute it is provided with in described base (1)
State the fixed cover (2) that location and installation mechanism includes being arranged in base (1) by bearing (3), be positioned at fixed cover (2)
Floating bushing (4), and the groups of springs (5) being arranged between fixed cover (2) and floating bushing (4)；Vibroshock to be welded
Piston-rod assembly (9) is positioned at gland (13) lower section, is arranged in floating bushing (4), thrust bearing (10) and bearing
(3) make damper piston-rod assembly (9) realize non-resistance in welding to rotate.
2. a kind of damper piston-rod assembly laser welding frock as claimed in claim 1, it is characterised in that described location
Installing mechanism also includes that gear ring (7), described gear ring (7) are arranged on the upper end of fixed cover (2), is driven solid by gear ring
Fixed set (2), floating bushing (4), groups of springs (5) and damper piston-rod assembly (9) synchronous axial system.
3. a kind of damper piston-rod assembly laser welding frock as claimed in claim 1, it is characterised in that described location
Installing mechanism also includes adjusting sleeve (6), and damper piston-rod assembly (9) is arranged on floating bushing (4) by adjusting sleeve (6)
In.
4. a kind of damper piston-rod assembly laser welding frock as claimed in claim 1, it is characterised in that described spring
Group (5) is zero stiffness butterfly spring group (5).
5. a kind of damper piston-rod assembly laser welding frock as claimed in claim 1, it is characterised in that described location
Installing mechanism also includes that spacing inner ring Clip Reed (8), described spacing inner ring Clip Reed (8) are arranged on the top of fixed cover (2)
End is internal.
6. such as a kind of damper piston-rod assembly laser welding frock as claimed in claim 1, it is characterised in that described pressure
That overlaps (13) is respectively provided on two sides with linear bearing (12), and described gland (13) is arranged on ladder by linear bearing (12)
On column (14), and with linear bearing (12) as guide.
7. a kind of damper piston-rod assembly laser welding frock as claimed in claim 1, it is characterised in that described ladder
Column (14) is divided into guide pillar part and support column part, and the external diameter of described guide pillar part is less than support column part, described gland
(13) it is arranged in guide pillar part.
8. a kind of damper piston-rod assembly laser welding frock as claimed in claim 1, it is characterised in that described vibration damping
Device piston-rod assembly (9) has piston rod (9.1), and piston rod (9.1) is sequentially provided with recovery constraint seat along its axial direction
(9.5), restore sheet (9.4), be set with the piston (9.2) of piston ring (9.3), circulation sheet (9.6), spring leaf
(9.7), pad (9.8) and planchet (9.9) are adjusted；Described recovery constraint seat (9.5) is axially stepped annular along it, institute
State recovery constraint seat (9.5) and be sleeved on non-user end both piston ends of piston rod, need to use laser welding mode with piston rod even
It is connected together, by restoring constraint seat (9.5) to circulation sheet (9.6), spring leaf (9.7), adjustment pad (9.8) and circle
Pad (9.9) is implemented axial constraint and applies axial precompression.
9. a damper piston-rod assembly method for laser welding, it is characterised in that utilize as claimed in claim 1 a kind of
Damper piston-rod assembly laser welding frock；
First damper piston-rod assembly (9) to be welded is installed in floating bushing (4) by adjusting sleeve (6)；
Then drive gland (13) to move down along ladder column (14) by hydraulic jack (14) and make thrust bearing (10)
Act on recovery constraint seat (9.5) of damper piston-rod assembly；
In the case of finally both laser focal is constant at guarantee laser instrument (11) invariant position, drive location by gear ring (7)
Installing mechanism and damper piston-rod assembly (9) synchronous axial system, open laser instrument (11) complete restore constraint seat (9.5) with
Welding between piston rod (9.1).
10. method as claimed in claim 9, it is characterised in that the chi of described damper piston-rod assembly to be welded (9)
Very little for L0Its scale error is △ L0, the camber of spring of groups of springs (5) is f1—f2Section i.e. amount of elastic deformation is △ f；Then △ L0
△ L need to be met with △ f0<△f。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610365597.9A CN105834602B (en) | 2016-05-30 | 2016-05-30 | A kind of damper piston-rod assembly laser welding frock and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610365597.9A CN105834602B (en) | 2016-05-30 | 2016-05-30 | A kind of damper piston-rod assembly laser welding frock and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105834602A true CN105834602A (en) | 2016-08-10 |
| CN105834602B CN105834602B (en) | 2018-01-23 |
Family
ID=56594889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610365597.9A Expired - Fee Related CN105834602B (en) | 2016-05-30 | 2016-05-30 | A kind of damper piston-rod assembly laser welding frock and method |
Country Status (1)
| Country | Link |
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| CN (1) | CN105834602B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03285799A (en) * | 1990-03-30 | 1991-12-16 | Topy Ind Ltd | Welding equipment for disk wheel |
| CN202291905U (en) * | 2011-10-22 | 2012-07-04 | 安徽省宁国市晨光汽车零部件有限公司 | Automatic welding device |
| CN103639635A (en) * | 2013-12-26 | 2014-03-19 | 辽宁工业大学 | Tool for automatically welding thick-wall hollow rod |
| CN203751541U (en) * | 2014-03-12 | 2014-08-06 | 合肥国轩高科动力能源股份公司 | Clamp for laser welding of cylindrical lithium battery current collecting disc |
| CN204430644U (en) * | 2015-01-28 | 2015-07-01 | 广东富华重工制造有限公司 | Casing flange rotary welding clamp |
| CN204818460U (en) * | 2015-08-10 | 2015-12-02 | 辽宁工业大学 | Bumper shock absorber hollow piston pole and solid end laser welding frock assembly |
| CN205673769U (en) * | 2016-05-30 | 2016-11-09 | 辽宁工业大学 | A kind of damper piston-rod assembly laser welding frock |
-
2016
- 2016-05-30 CN CN201610365597.9A patent/CN105834602B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03285799A (en) * | 1990-03-30 | 1991-12-16 | Topy Ind Ltd | Welding equipment for disk wheel |
| CN202291905U (en) * | 2011-10-22 | 2012-07-04 | 安徽省宁国市晨光汽车零部件有限公司 | Automatic welding device |
| CN103639635A (en) * | 2013-12-26 | 2014-03-19 | 辽宁工业大学 | Tool for automatically welding thick-wall hollow rod |
| CN203751541U (en) * | 2014-03-12 | 2014-08-06 | 合肥国轩高科动力能源股份公司 | Clamp for laser welding of cylindrical lithium battery current collecting disc |
| CN204430644U (en) * | 2015-01-28 | 2015-07-01 | 广东富华重工制造有限公司 | Casing flange rotary welding clamp |
| CN204818460U (en) * | 2015-08-10 | 2015-12-02 | 辽宁工业大学 | Bumper shock absorber hollow piston pole and solid end laser welding frock assembly |
| CN205673769U (en) * | 2016-05-30 | 2016-11-09 | 辽宁工业大学 | A kind of damper piston-rod assembly laser welding frock |
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| Publication number | Publication date |
|---|---|
| CN105834602B (en) | 2018-01-23 |
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