CN108145060A - U-shaped part riveting fixture and U-shaped part clinching method - Google Patents
U-shaped part riveting fixture and U-shaped part clinching method Download PDFInfo
- Publication number
- CN108145060A CN108145060A CN201711408083.8A CN201711408083A CN108145060A CN 108145060 A CN108145060 A CN 108145060A CN 201711408083 A CN201711408083 A CN 201711408083A CN 108145060 A CN108145060 A CN 108145060A
- Authority
- CN
- China
- Prior art keywords
- locating piece
- connector
- riveting
- positioning
- reinforcer
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J15/00—Riveting
- B21J15/38—Accessories for use in connection with riveting, e.g. pliers for upsetting; Hand tools for riveting
- B21J15/42—Special clamping devices for workpieces to be riveted together, e.g. operating through the rivet holes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J15/00—Riveting
- B21J15/10—Riveting machines
- B21J15/14—Riveting machines specially adapted for riveting specific articles, e.g. brake lining machines
Abstract
The present invention relates to a kind of U-shaped part riveting fixtures, including opposite locating piece, it is synchronous rotary and can pass through locking mechanism latched position when being rotated in place, U-shaped part accommodation space (17) is separated between locating piece, the fitting positioning surface (15) for positioning link reinforcer (12) and the pin positioning structure that is formed on the fitting positioning surface (15) are formed on each locating piece, the respective fitting positioning surface (15) of locating piece is relative to each other.The present invention also provides a kind of U-shaped part clinching methods.The U-shaped part riveting fixture of the present invention is not easy the difficult point overturn when efficiently solving the production of connector assembly, reduces labor intensity, improves efficiency, improves the convenience of process operation.It is also very favorable for improving riveting quality simultaneously as can easily carry out riveting operation by riveting fixture of the present invention.
Description
Technical field
The present invention relates to the frock clamps used in a kind of sheet metal component process, and in particular, to a kind of U-shaped part riveting
Connect frock clamp.Moreover, it relates to a kind of U-shaped part clinching method.
Background technology
Generally using riveting, such as riveting, connector and the company of connector and sheet metal component longeron in sheet metal component processing
Riveting of fitting reinforcer etc..
Typically, on the larger vehicle of some loading capacity (such as heavy truck), connector needs and corresponding connection
Part reinforcer sheet metal component needs to be riveted together by riveting process, to form connector assembly, then by the connector assembly
It is installed on sheet metal component longeron.
Connector generally have U-shaped cross-section, connector reinforcer be generally l-shaped cross section (can certainly have with
Other sections that connector is adapted, such as the U-shaped cross-section that can be inserted into for connector one end), in existing design, connector
Upper lower aerofoil be respectively provided with rivet hole, the upper and lower aerofoil at both ends rivets respectively with a connector reinforcer, corresponding each
Corresponding riveted holes are formed on a connector reinforcer, so as to rivet on the upper and lower aerofoil at the both ends for completing rear connectors
Riveting is formed with connector reinforcer respectively, so that connector rivets to form an entirety with connector reinforcing plate.
At present in riveting part assembly, it is mainly attached part riveting on the table, but can be only done in this way
One in face of connector and the riveting of connector reinforcing plate.Another side riveting needs connector to turn to be riveted.Because
The steel plate materials material thickness that the sheet metal component for the vehicle that the loading capacity such as heavy truck increase uses is thicker, heavier-weight, manual operation labor
Fatigue resistance is very high, this causes production efficiency very low, and processes inconvenience.
Invention content
The technical problems to be solved by the invention are to provide a kind of connector assembly riveting fixture, riveting tool folder
Tool can be advantageously available for the riveting operation of connector and connector reinforcer, so as to reduce labor intensity, improve working efficiency,
It is conveniently operated.
In addition, further the technical problem to be solved is that provide a kind of connector assembly clinching method, the riveting by the present invention
The method of connecing can advantageously be attached the riveting operation of part and connector reinforcer, to reduce labor intensity, improve work effect
Rate.
In order to solve the above technical problem, the present invention provides a kind of U-shaped part riveting fixture, wherein, the riveting tool
Fixture include opposite locating piece, the opposite locating piece be installed as can synchronous rotary and when being rotated in place by locking machine
Structure latched position, between the locating piece between be separated with U-shaped part accommodation space, be formed on each locating piece for the company of positioning
The fitting positioning surface of fitting reinforcer and the pin positioning structure being formed on the fitting positioning surface, the respective fitting of locating piece
Positioning surface is relative to each other.
Preferably, the locating piece is arranged symmetrically.
Specifically, the pin positioning structure include positioning pin, be formed in it is described for being inserted on the fitting positioning surface
Two pairs of dowel holes of positioning pin, when the locating piece rotates to be horizontality, a pair in two pairs of dowel holes is determined
Position pin hole is in the top of another pair dowel hole.
In addition, the present invention also provides a kind of U-shaped part clinching method, the U-shaped part includes connector and connector reinforcer,
Wherein, cooperation dowel hole is formed on the positioning basal plane of the connector reinforcer, the clinching method includes the following steps：
First, correspondence locating piece in the opposite locating piece that the positioning basal plane of each connector reinforcer is fitted to respectively
It is bonded on positioning surface, and each connector reinforcer is positioned by hole pin cooperation, the connector is navigated to relatively
The locating piece on the connector reinforcer between, and cause the connector opposite riveting face on rivet hole
It is aligned respectively with the rivet hole on the corresponding connector reinforcer；Second, it is locked as in the locating piece so that the company
In a state that the opposite riveting face of fitting is in horizontal, to being riveted in the riveting face of top in the riveting face；
Third discharges the locating piece so that the opposite locating piece to be driven to rotate 180 °, and locks the postrotational position of the locating piece
It puts；4th, to being riveted in the riveting face of top in riveting face described after rotation.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Drawings below is used to provide further understanding of the present invention, and a part for constitution instruction, and following
Specific embodiment together for explaining the present invention, but protection scope of the present invention is not limited to following attached drawings and specific real
Apply mode.In the accompanying drawings：
Fig. 1 is the structure diagram of the U-shaped part after the completion of riveting.
Fig. 2 is the main structure diagram of the U-shaped part riveting fixture of the specific embodiment of the invention.
Fig. 3 is the side structure schematic view of the U-shaped part riveting fixture of the specific embodiment of the invention.
Fig. 4 is the state that the riveting operation of part assembly is attached using connector assembly riveting fixture shown in FIG. 1
Schematic diagram, wherein connector to be riveted and connector reinforcer are located on the connector assembly riveting fixture.
Fig. 5 is the flow diagram of the connector assembly clinching method of the specific embodiment of the invention.
Reference sign：
1 turning operation wheel；2 racks；
3 driving chains；4 transmission shafts；
5 second sprocket wheels；6 locking pins；
7 positioning pins；8 positioning backup plates；
9 first sprocket wheels；10 dowel holes；
11 connectors；12 connector reinforcing plates；
13 cooperation dowel holes；14 supporting surfaces；
15 fitting positioning surfaces；16 positioning basal planes；
17U shape part accommodation spaces.
Specific embodiment
The specific embodiment of the present invention is described in detail below in conjunction with attached drawing, it should be appreciated that retouch in this place
The specific embodiment stated is merely to illustrate and explain the present invention, and protection scope of the present invention is not limited to following specific realities
Apply mode.
Referring first to shown in Fig. 1, Fig. 1 shows the schematic diagram of the larger typical U-shaped part used of loading capacity, the U-shaped part one
As include one or two connector 11, connector 11 has U-shaped cross-section (be more accurately essentially [shape cross section), is adopting
In the case of with two connectors, the side of two connectors is bonded to each other, i.e., usually said " back-to-back " setting, connection
The upper and lower flange of part 11 forms upper and lower aerofoil, and the upper and lower airfoil area at 11 both ends of connector forms opposite riveting face,
It is generally formed with several rivet holes on riveting face, the end of connector 11 is inserted respectively into opposite connector reinforcer in Fig. 1
Between 12, which has the riveting corresponding to connector 11 of l-shaped cross section, wherein connector reinforcer 11
The flange part of face contact is also formed with corresponding rivet hole, and riveting in this way is completed on the upper and lower riveting face at rear connectors both ends
There are one the connector reinforcing plates 12 of l-shaped cross section for riveting respectively.Certainly, only it is the connector reinforcement of canonical form shown in Fig. 1
Part 12, but connector reinforcer 12 is not limited to this, such as connector reinforcer 12 can also have U-shaped cross-section (more accurately
Ground be essentially [shape cross section), in this case, the both ends of connector 11 only need respectively to rivet a connector reinforcer 11
, specifically, the end of connector 11 is inserted into the open slot of connector reinforcer 12, and causes 11 both ends of connector
Upper and lower riveting face touched respectively with the upper and lower turn-up portion of connector reinforcer 12 tap.
In general, the following riveting fixture of the present invention can be readily applied to above-mentioned connector reinforcer and company
The riveting operation of fitting, generally can be by the one side on above-mentioned connector reinforcer 12 (such as under U-shaped part assembled state
The medial plane with 11 perpendicular part of connector of connector reinforcer 12) as positioning basal plane 16, and in the positioning basal plane
Cooperation dowel hole 13 (cooperation dowel hole there are two being formed on general each connector reinforcer 12), the positioning are formed on 16
The positioning surface 15 that is bonded of the locating piece of the riveting fixture following with the present invention of basal plane 16 is bonded, and coordinate dowel hole 13
Coordinate with the pin positioning structure on locating piece, it is follow-up in order to carry out so as to form " six point locations " by plane and two pits
Connector assembling and riveting, the U-shaped part riveting fixture of the present invention is specifically described referring to Fig. 2 and Fig. 3.
Referring to shown in Fig. 2 and Fig. 3, within the scope of the technical concept of the present invention, U-shaped part riveting fixture packet of the invention
Opposite locating piece is included, which is installed as synchronous rotary and to lock by locking mechanism when being rotated in place
Position, between the locating piece between be separated with U-shaped part accommodation space, be formed on each locating piece and add for positioning link
The fitting positioning surface 15 of strong part 12 and the pin positioning structure being formed on the fitting positioning surface 15, the respective fitting of locating piece
Positioning surface 15 is relative to each other.It is apparent that above-mentioned locating piece can be Fig. 2 and positioning backup plate 8 shown in Fig. 3, but locating piece is not
It is limited to the planform of positioning backup plate 8, but there can be various simple constructional variants, as long as but it belongs to the present invention's
Technical concept all belongs to the scope of protection of the present invention.
On the basis of above-mentioned basic embodiment, due to the connector reinforcer 12 1 at 11 both ends of connector in U-shaped part
As be symmetrical, it is preferred that the opposite locating piece can be arranged symmetrically.
As mentioned previously, the fitting positioning surface 15 of each locating piece is used to be bonded the positioning of corresponding connector reinforcer 12
Basal plane 16, while generally formed on the positioning basal plane 16 of each connector reinforcer there are two cooperation dowel hole 13, according to one
Two pin-shaped of face into six point locations machining positioning principle, each locating piece fitting positioning surface 15 on pin positioning structure it is general
It can include positioning pin 7, the two pairs of dowel holes 10 for being used to be inserted into the positioning pin 7 being formed on fitting positioning surface 15,
When the locating piece rotates to be horizontality, a pair of of dowel hole in two pairs of dowel holes 10 is in another pair positioning pin
The top in hole.Herein it should be noted that the pin positioning structure of this concrete form is mainly on heavy vehicle shown in Fig. 3
Typical U-shaped part, i.e., the connector for riveting a l-shaped cross section on the upper and lower riveting face at 11 both ends of connector respectively are strengthened
Part 12, but the pin positioning structure can carry out structure change according to the connector reinforcer 12 that 11 both ends of connector rivet
Type, such as described above, when 11 both ends of connector rivet the connector reinforcer 12 of U-shaped cross-section respectively, above-mentioned pin
Location structure includes a pair of of dowel hole.In addition to this, quantity pair of the quantity of positioning pin 7 generally with dowel hole 10
Should, in fact, positioning pin 7 can also be formed directly on locating piece, such as in figure 2 and figure 3, positioning pin 7 is directly formed
On the fitting positioning surface 10 of positioning backup plate 8, the positioning action of hole pin cooperation can be equally realized.Therefore, it is no matter described fixed
Position part on pin positioning structure how modification, all belong to the scope of protection of the present invention.
As a kind of preferred embodiment, each locating piece further includes to be added for connector described in Auxiliary support
The supporting surface 14 of strong part 12, which extends perpendicular to fitting positioning surface 15 and towards U-shaped part accommodation space, so that institute
It states fitting positioning surface 15 and is formed as L-shaped with supporting surface 14.Such as in figure 2 and figure 3, each locating piece is in L for cross section
The positioning backup plate 8 of shape positions the fitting positioning surface that opposite inner surface between backup plate 8 forms the corresponding positioning backup plate 8
15.And position backup plate 8 then forms supporting surface 14 towards the flange part extended in connector assembly accommodation space, the supporting surface
14 when by 11 initial alignment to locating piece of connector reinforcer 12 and connector, can play the role of Auxiliary support, from
And it is more convenient for connector reinforcer 12 and connector 11 being assembled into position to be riveted.
As above it described in basic mode, is installed as synchronous rotary and to be rotated in place in the opposite locating piece of the present invention
When pass through locking mechanism latched position.Specifically, referring to shown in Fig. 2 and Fig. 3, riveting fixture of the invention further includes rack
2, the opposite locating piece can be installed to synchronous rotary in the rack 2.The opposite locating piece is respectively connected on can
The corresponding pivotal axis being rotatably supported in rack 2 is separately installed with the first sprocket wheel 9, each first chain on each pivotal axis
Wheel 9 is connected to corresponding second sprocket wheel 5 in rack 2, second sprocket wheel 5 by corresponding driving chain 3 respectively
Between it is coaxially connected by the transmission shaft 5 being rotatably supported in rack 2, any one in the first sprocket wheel 9 and the second sprocket wheel 5 can
Think drive sprocket.In figure 2 and figure 3, two the second sprocket wheels 5 connected by transmission shaft 4 be mounted on rack 2 lower part (when
So it is not limited to this), the drive mechanism of the entire rotary driving force of opposite locating piece is rendered as the groove type knot of U-shaped like
Structure so as to can not only realize the synchronous rotary of opposite locating piece, but also can extend into U-shaped part to avoid transmission mechanism
In accommodation space, and interfered when carrying out riveting operation with the connector reinforcer 12 in U-shaped part and connector 11.Herein
Explanation is also needed, it is above-mentioned to be used to that the drive mechanism of opposite locating piece synchronous rotary to be driven to be not limited to Fig. 2 and Fig. 3 institutes
The concrete structure situation shown under the enlightenment of the technical concept of the present invention, can carry out various structures modification, such as can incite somebody to action
Above-mentioned first and second sprocket wheel 9,5 changes into gear, if the difference in height between upper and lower two gears not enough may cause to pass
Moving axis 4 influences U-shaped part accommodation space, can increase intermediate gear.In addition, above-mentioned mesh can equally be realized by belt wheel etc.
's.
As described above, any one in the first sprocket wheel 9 and the second sprocket wheel 5 can be drive sprocket, in this case, as
Drive sprocket can drive in several ways, such as motor driving etc..In figure 2 and figure 3, the specific embodiment of the invention
Riveting fixture manually drives, and specifically, referring to shown in Fig. 2 and Fig. 3, one in first sprocket wheel 9 is
Drive sprocket, the one end for being equipped with the pivotal axis of the drive sprocket pass through the support holes in the rack 2 and reach institute
The outside of rack 1 is stated, one end of the stretching of the pivotal axis is connected with turning operation wheel 1.In this way by rotating the turning operation wheel
1, opposite locating piece can easily be driven to realize synchronous rotary.
Diversified forms may be used in the locking mechanism, for example, in figure 2 and figure 3 using the opposite locking simplified of structure
The form of pin specifically, machine is reached for being equipped with one end of the pivotal axis of drive sprocket across the support holes in rack 2
The outside of frame 2, for installing turning operation wheel, therefore the locking mechanism can include locking pin 6, be formed in the bearing
Lock pin holes and the cooperation lock pin holes being formed on the pivotal axis peripheral surface on the hole wall of hole, the lock pin holes are described
Locating piece can be aligned with the cooperation lock pin holes when rotating to precalculated position so that locking pin 6 be inserted into it is described
In lock pin holes and cooperation lock hole.General cooperation lock pin holes can basis in the position that pivotal axis peripheral surface is formed and quantity
Operation is selected, for example, it is required that locating piece rotates to so that connector after positioning in the present invention
Opposite riveting face is in level, therefore can form that angle is 180 ° on the precalculated position of the peripheral surface of pivotal axis two
Cooperation lock pin holes (the cooperation lock pin holes that the two cooperation lock pin holes can certainly be formed as to a perforation), so as to
The opposite riveting face for causing connector in a position of locating piece rotation is in level, rotates the opposite of 180 ° of rear connectors
Riveting face be still within level, and can be locked by locking mechanism in the two positions.The locking mechanism is simultaneously
The form using locking pin is not limited to, clamp spring, locking bushing etc. may be used, and belong to the technology structure of the present invention
Think.
The U-shaped part riveting side carried out referring to Fig. 4 and Fig. 5 descriptions using the above-mentioned riveting fixture of the present invention
Method.
In the U-shaped part clinching method of the present invention, the U-shaped part includes connector 11 and connector reinforcer 12, wherein,
Cooperation dowel hole 13, connector assembly clinching method Li Bao are formed on the positioning basal plane 16 of the connector reinforcer 12
Include following steps：
First, pass through the patch of the corresponding locating piece for fitting to the positioning basal plane 14 of each connector reinforcer 12
It closes on positioning surface 15, and causes 13 corresponding matching of cooperation dowel hole of the pin positioning structure and connector reinforcer 12, tool
Body is to be directed at the dowel hole 10 in the pin positioning structure, and insert with the cooperation dowel hole 13 on connector reinforcer 12
Enter positioning pin 7 to be positioned, so as to position the corresponding connector reinforcer 12 on each locating piece, and then will even
Fitting 11 is navigated between the connector reinforcer 12 on the opposite locating piece, and causes the opposite of the connector (11)
Riveting face on rivet hole be aligned respectively with the rivet hole on the corresponding connector reinforcer.
Second, the opposite riveting face that connector 11 is locked as by locking mechanism in locating piece is in horizontal shape
Under state, to being riveted in the riveting face of top in the riveting face.Herein it should be noted that carrying out first time riveting
When connecing, as long as locating piece is in so that the opposite riveting face of connector 11 specifically rotates in the state of level
Operation can carry out before first step is carried out, and can also be carried out before the riveting operation of the second step, and the present invention is to this
It is restricted.
Third discharges the locking mechanism, such as is rotated by above-mentioned turning operation wheel 1, so as to by above-mentioned
Chain wheel driving mechanism causes 180 ° opposite of the locating piece synchronous rotary, and passes through the locking mechanism and lock the locating piece
Postrotational position；
4th, to being riveted in the riveting face of top in riveting face described after rotation.
The invention has the advantages that, U-shaped part riveting fixture of the invention, which has, to be oppositely arranged it can be seen from upper description
Locating piece, by the fitting positioning surface 15 and pin positioning structure on each locating piece, can easily positioning link add
Strong part 12, and between connector 11 is navigated to corresponding connector reinforcer 12, due to the opposite locating piece peace of the present invention
It fills as being capable of synchronous rotary and can be by locking mechanism latched position, therefore in 12 He of connector reinforcer when being rotated in place
After connector 11 positions, easily opposite locating piece it can rotate to by the present invention and cause the phase of connector 11
To riveting face be horizontal, then to being riveted in the riveting face of top on opposite riveting face, riveted
Into after one side, the locking of locating piece, and then 180 ° of the locating piece that synchronous rotary is opposite can be discharged, so that the phase of connector
To riveting face in another riveting face be in top, the position of postrotational locating piece is locked by locking mechanism, it is then right
Another riveting face is riveted.Therefore, when U-shaped part riveting fixture of the invention efficiently solves the production of connector assembly
The difficult point overturn is not easy, reduces labor intensity, improves efficiency, improves the convenience of process operation.Meanwhile
It is also highly beneficial for improving riveting quality due to can easily carry out riveting operation by riveting fixture of the present invention
's.
Claims (4)
1.U shape part riveting fixtures, wherein, which includes opposite locating piece, the opposite locating piece peace
Fill for can synchronous rotary and when being rotated in place by locking mechanism latched position, between the locating piece between be separated with U-shaped part
Accommodation space (17), be formed on each locating piece for positioning link reinforcer (12) fitting positioning surface (15) and
The pin positioning structure being formed on the fitting positioning surface (15), the respective fitting positioning surface (15) of locating piece are relative to each other.
2. riveting fixture according to claim 1, wherein, the locating piece is arranged symmetrically.
3. riveting fixture according to claim 4, wherein, the positioning L-shaped for cross section of each locating piece
Backup plate (8), opposite inner surface forms the fitting positioning of the corresponding positioning backup plate (8) between positioning backup plate (8)
Face (15).
4.U shape part clinching methods, the U-shaped part include connector (11) and connector reinforcer (12), wherein, the connector
Cooperation dowel hole (13) is formed on the positioning basal plane (16) of reinforcer (12), the clinching method includes the following steps：
First, in the opposite locating piece that the positioning basal plane (16) of each connector reinforcer (12) is fitted to respectively
On the fitting positioning surface (15) of corresponding locating piece, and each connector reinforcer (12) is positioned by hole pin cooperation, it will
The connector (11) is navigated between the connector reinforcer (12) on the opposite locating piece, and causes the company
Rivet hole on the opposite riveting face of fitting (11) is aligned respectively with the rivet hole on the corresponding connector reinforcer；
Second, in a state that the locating piece is locked as so that the opposite riveting face of the connector (11) is in horizontal,
To being riveted in the riveting face of top in the riveting face；
Third discharges the locating piece so that the opposite locating piece to be driven to rotate 180 °, and after locking the locating piece rotation
Position；
4th, to being riveted in the riveting face of top in riveting face described after rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711408083.8A CN108145060A (en) | 2017-12-22 | 2017-12-22 | U-shaped part riveting fixture and U-shaped part clinching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711408083.8A CN108145060A (en) | 2017-12-22 | 2017-12-22 | U-shaped part riveting fixture and U-shaped part clinching method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108145060A true CN108145060A (en) | 2018-06-12 |
Family
ID=62465224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711408083.8A Pending CN108145060A (en) | 2017-12-22 | 2017-12-22 | U-shaped part riveting fixture and U-shaped part clinching method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108145060A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108856629A (en) * | 2018-07-26 | 2018-11-23 | 四川广旺能源发展（集团）有限责任公司机械制造分公司 | A kind of tramcar chassis riveting rotary tooling |
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| US6961983B1 (en) * | 2002-08-20 | 2005-11-08 | Cessna Aircraft Company | Tooling for rivet gun |
| DE102007020166A1 (en) * | 2007-04-26 | 2008-10-30 | Robert Bosch Gmbh | Tool holder with mechanical means of action |
| KR20110098143A (en) * | 2010-02-26 | 2011-09-01 | 현대제철 주식회사 | Jig for riveting brake liner of hoist brake |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108856629A (en) * | 2018-07-26 | 2018-11-23 | 四川广旺能源发展（集团）有限责任公司机械制造分公司 | A kind of tramcar chassis riveting rotary tooling |
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Application publication date: 20180612 |
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