CN113070705A - Milling machine fixture for combination of roller shaft and L-shaped gasket of railway wagon bogie - Google Patents
Milling machine fixture for combination of roller shaft and L-shaped gasket of railway wagon bogie Download PDFInfo
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- CN113070705A CN113070705A CN202110485592.0A CN202110485592A CN113070705A CN 113070705 A CN113070705 A CN 113070705A CN 202110485592 A CN202110485592 A CN 202110485592A CN 113070705 A CN113070705 A CN 113070705A
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- 238000003801 milling Methods 0.000 title claims abstract description 24
- 230000006835 compression Effects 0.000 claims description 12
- 238000007906 compression Methods 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims 3
- 239000011148 porous material Substances 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000003754 machining Methods 0.000 description 11
- 238000013459 approach Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/061—Work-clamping means adapted for holding a plurality of workpieces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/18—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for positioning only
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Abstract
A milling machine clamp combining a roller shaft and an L-shaped gasket of a railway wagon bogie relates to a combined clamp for processing workpieces of the railway wagon bogie. The L-shaped gasket clamp comprises a mounting seat and an L-shaped gasket clamping block; the roller shaft clamp comprises a base, a V-shaped block and a return spring, wherein a left positioning feeler block is installed at one end of the base, a right positioning feeler block is installed at the other end of the base, a fixed V-shaped block is installed on the left positioning feeler block, an end follow-up V-shaped block is installed at the other end of the base, and a middle V-shaped block is installed between the fixed V-shaped block and the end follow-up V-shaped block. The invention has the beneficial effects that: the combined milling machine fixture provided by the invention sets the distance between the roller shaft and the L-shaped gasket, realizes simultaneous processing of a plurality of roller shafts and a plurality of L-shaped gaskets, greatly improves the processing efficiency of the roller shafts and the L-shaped gaskets, releases the processing capacity of the milling machine, and improves the processing capacity by at least 5 times.
Description
The technical field is as follows:
a milling machine clamp combining a roller shaft and an L-shaped gasket of a railway wagon bogie relates to a combined clamp for processing workpieces of the railway wagon bogie.
Background art:
at present, each machining company mostly adopts a vice to clamp a single shaft or a single L-shaped gasket, and also adopts a V-shaped block structure to clamp a plurality of special clamps of the shaft. The vice is adopted to clamp a single shaft or a single L-shaped gasket, the clamping efficiency is low, and the tool needs to be reset every time of processing; the special fixture for clamping the plurality of shafts by adopting the V-shaped block structure can not automatically reset when the shafts are loosened, and the processed shafts can be taken out by moving the V-shaped blocks.
The vice is a general fixture configured on the milling machine, has the characteristics of reliable clamping, wide application range and the like, but has the defect of low clamping capacity, only one processed workpiece is clamped under normal conditions, the processing efficiency is low, and if 6 roller shafts and 6L-shaped gaskets are clamped, the clamping is required for 12 times, the cutter setting is required for 6 times, 18 cutters are processed, and the productivity is seriously influenced.
The invention content is as follows:
the invention aims to solve the technical problem of providing a combined milling machine fixture which can be used for clamping a plurality of roller shafts and a plurality of L-shaped gaskets at one time. The technical scheme is as follows:
a milling machine fixture combining a roller shaft and an L-shaped gasket of a railway freight car bogie is characterized by comprising an L-shaped gasket fixture and a roller shaft fixture, wherein the L-shaped gasket fixture comprises a mounting seat and an L-shaped gasket clamping block, the mounting seat is provided with a U-shaped groove, the L-shaped gasket clamping block comprises a follow-up block, the follow-up block is positioned in the U-shaped groove of the mounting seat, the middle part of the follow-up block is provided with a threaded shaft hole, countersunk threaded holes are uniformly distributed at two sides of the threaded shaft hole, the outer side wall of the mounting seat is provided with a corresponding threaded shaft hole and a corresponding countersunk threaded screwed hole, a second threaded shaft is arranged in the threaded shaft holes at the middle parts of the follow-up block and the mounting seat, the outer end of the second threaded shaft is provided with a second handle, thimbles are respectively arranged in the countersunk threaded holes of the follow-up block and the mounting seat, one end of each thimble is sleeved with, the other end of the U-shaped groove extends out of a countersunk threaded hole of the mounting seat, and L-shaped gaskets are respectively placed at the positions, located on the thimbles, of the tail ends of the inner sides of the U-shaped grooves; the roller shaft clamp comprises a base, a V-shaped block and a return spring, one end of the base is provided with a left positioning feeler block, the other end of the base is provided with a right positioning feeler block, the left positioning feeler block is provided with a fixed V-shaped block, the other end of the base is provided with a following V-shaped block, a middle V-shaped block is arranged between the fixed V-shaped block and the end follow-up V-shaped block, the bottoms of the fixed V-shaped block, the middle V-shaped block and the end follow-up V-shaped block are respectively provided with a counter bore, a right positioning feeler block is provided with a first threaded shaft, one end of the first threaded shaft is provided with a press block, the contact end of the press block is connected with the end follow-up V-shaped block, the other end of the first threaded shaft is provided with a first handle, and a spring guide shaft is arranged between the left positioning feeler block and the right positioning feeler block and positioned at the lower ends of the fixed V-shaped block, the middle V-shaped block and the end follow-up V-shaped block, a return spring is sleeved on the spring guide shaft, and the return springs are respectively arranged in countersunk holes corresponding to the fixed V-shaped block, the middle V-shaped block and the end follow-up V-shaped block.
One end of the ejector pin is provided with an ejector pin boss, and the ejector pin boss is located in a countersunk head threaded hole of the follow-up square block.
And a fixing nut is sleeved in the hole of the right positioning feeler block, and a first threaded shaft is installed on the fixing nut.
The spring guide shaft penetrates through the right positioning feeler block.
And the base is provided with a limiting plate.
And the upper plane of the left positioning tool setting block and the two side surfaces of the fixed V-shaped block are provided with left tool setting surfaces, and the upper plane of the upper part of the right positioning tool setting block and the upper planes of the two sides of the right positioning tool setting block are provided with right tool setting surfaces.
Compared with the prior art, the invention has the following beneficial effects:
1. the combined milling machine fixture clamps a plurality of roller shafts and a plurality of L-shaped gaskets at one time, so that the clamping efficiency is improved;
2. the roller shaft clamping part is provided with the return spring, so that the shaft clamping part has an automatic return function, and the unloading efficiency is improved;
3. the clamping part of the L-shaped gasket is provided with a spring pre-tightening thimble, and each L-shaped gasket has an independent pressing force, so that the unreliable clamping condition of the L-shaped gasket caused by thickness deviation is eliminated, and the clamping reliability is improved;
4. the combined milling machine fixture provided by the invention sets the distance between the roller shaft and the L-shaped gasket, realizes simultaneous processing of a plurality of roller shafts and a plurality of L-shaped gaskets, greatly improves the processing efficiency of the roller shafts and the L-shaped gaskets, releases the processing capacity of the milling machine, and improves the processing capacity by at least 5 times.
5. According to the combined milling machine fixture, the milling cutter aligning surface is arranged at the angle 4 of the fixture, the first cutter machining inherits the cutter aligning position of the last machining, namely the relative position of the milling cutter and the fixture is unchanged, and only the milling cutter is directly machined; the second cutter utilizes the cutter face to set the cutter, and the whole machining process only sets the cutter once, improves cutter setting efficiency.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a left side view of FIG. 1;
FIG. 4 is a schematic view of a roller clamp structure according to the present invention;
FIG. 5 is a cross-sectional view of FIG. 2A-A;
FIG. 6, a left side view of FIG. 4;
FIG. 7 is a cross-sectional view of FIG. 4B-B;
FIG. 8 is an enlarged view of a portion of FIG. 5C;
FIG. 9 is a drawing of FIG. 4D;
FIG. 10 is a schematic view of an L-shaped shim holder according to the present invention;
FIG. 11 is a left side view of FIG. 10;
FIG. 12, which is a view taken from the direction of FIG. 11F;
FIG. 13, which is a cross-sectional view of FIGS. 10E-E;
FIG. 14 is a schematic view of the L-shaped shim clamping block assembly of the present invention;
FIG. 15 is a top view of FIG. 14;
fig. 16 is a sectional view of fig. 14G-G.
The specific implementation mode is as follows:
referring to fig. 1 to 3, the milling machine fixture for the combination of the roller shaft and the L-shaped gasket of the railway wagon bogie is characterized by comprising an L-shaped gasket fixture 2 and a roller shaft fixture 1, wherein the L-shaped gasket fixture 2 is connected with the roller shaft fixture 1 through a connecting screw 3. Referring to fig. 10 to 13, the L-shaped gasket fixture 2 includes a mounting seat 2.7 and an L-shaped gasket clamping block, and the mounting seat 2.7 is provided with a U-shaped groove 2.8; as shown in fig. 14 to 16, the L-shaped gasket clamping block assembly has a follow-up block 2.6, the follow-up block 2.6 is located in a U-shaped groove 2.8 of the mounting base, a threaded shaft hole is formed in the middle of the follow-up block 2.6, and a plurality of countersunk threaded holes are uniformly distributed on two sides of the threaded shaft hole; the outer side wall of the mounting seat 2.7 is provided with a threaded shaft hole and a countersunk threaded hole which correspond to the follow-up block 2.6, a second threaded shaft 2.9 is mounted in the threaded shaft hole in the middle of the follow-up block 2.6 and the mounting seat 2.7, the second threaded shaft 2.9 is in threaded connection with the follow-up block 2.6, the follow-up block 2.6 is limited by the mounting seat 2.7 and can only move back and forth along the axial direction of the second threaded shaft 2.9, the outer end of the second threaded shaft 2.9 is provided with a second handle 2.3, thimbles 2.10 are respectively mounted in the countersunk threaded holes of the follow-up block 2.6 and the mounting seat 2.7, one end of each thimble is sleeved with a compression spring 2.11, the compression spring 2.11 is positioned in the countersunk threaded hole, the other end of each thimble 2.10 is sleeved with a spring pre-tightening nut 2.2, one end of each spring pre-tightening nut 2.2 is in threaded connection with the follow-up block; as shown in fig. 2 and fig. 11 to fig. 13, a roller shaft positioning gasket 2.5 is mounted at the tail part of the inner side of the mounting seat 2.7 through a connecting screw, and the distance between the roller shaft 1.12 and the L-shaped gasket 2.1 can be changed by adjusting the thickness of the roller shaft positioning gasket 2.5; referring to fig. 1-9, a roller shaft clamp 1 comprises a base 1.11, a V-shaped block and a return spring 1.14, one end of the base 1.11 is provided with a left positioning feeler block 1.1 by a connecting screw, the other end is provided with a right positioning feeler block 1.10 by a connecting screw, a fixed V-shaped block 1.2 is arranged on the left positioning feeler block 1.1, the other end of the base 1.11 is provided with an end follow-up V-shaped block 1.4, a middle V-shaped block 1.3 is arranged between the fixed V-shaped block 1.2 and the end follow-up V-shaped block 1.4, the bottoms of the fixed V-shaped block 1.2, the middle V-shaped block 1.3 and the end follow-up V-shaped block 1.4 are respectively provided with a countersunk hole, a first threaded shaft 1.6 is arranged on the right positioning feeler block 1.10, one end of the first threaded shaft is provided with a press block 1.5, a contact end of the press block 1.5 is connected with the follow-up V-shaped block 1.4, the other end of the first threaded shaft 1.6 is provided with a first handle 1.8, the left positioning feeler block 1.1.1.1.1, the middle positioning feeler block is arranged between the left positioning feeler, the spring guide shaft 1.13 is sleeved with a plurality of sections of reset springs 1.14, and the plurality of sections of reset springs 1.14 are respectively arranged in countersunk holes corresponding to the fixed V-shaped block 1.2, the middle V-shaped block 1.3 and the end follow-up V-shaped block 1.4.
One end of the thimble is provided with a thimble boss 2.4, and the thimble boss 2.4 is positioned in the countersunk head threaded hole of the follow-up square block 2.6.
A fixing nut 1.7 is sleeved in a hole of the right positioning feeler block 1.10, and a first threaded shaft 1.6 is installed on the fixing nut 1.7.
The spring guide shaft 1.13 penetrates through the right positioning feeler block 1.10 and is fixed by a spring guide shaft nut 1.9.
A limiting plate 1.15 is arranged on the base 1.11, and a limiting groove is formed after the limiting plate 1.15 and the base 1.11 are arranged for the middle V-shaped block 1.3 and the end follow-up V-shaped block 1.4 to move.
Left pair of tool bits 1.1.1 are arranged on the upper plane of the left positioning tool setting block 1.1 and two side surfaces of the fixed V-shaped block 1.2, and right pair of tool bits 1.10.1 are arranged on the upper two side surfaces and two side planes of the right positioning tool setting block 1.10. After the roller shaft and the L-shaped gasket are clamped on the clamp, the machining position of the roller shaft and the L-shaped gasket can be determined by the tool setting block.
The working process of the invention is as follows:
l-shaped gasket:
the L-shaped gasket clamping process and the action principle are as follows: as shown in fig. 11, 13 and 14, L-shaped gaskets 2.1 are respectively placed at positions, located on the thimble 2.10, of the tail end of the inner side of the U-shaped groove 2.8 of the mounting seat, and the second threaded shaft 2.9 performs a rotary motion under the action of the second handle 2.3, because the second threaded shaft 2.9 is in threaded connection with the follow-up block 2.6 located in the U-shaped groove 2.8, and the U-shaped groove 2.8 limits the rotary motion of the follow-up block 2.6, the follow-up block 2.6 can only move back and forth along the axial direction of the second threaded shaft 2.9, and the follow-up block 2.6 approaches to the L-shaped gaskets 2.1; as shown in fig. 16, one end of the thimble 2.10 is sleeved with a compression spring 2.11, the compression spring 2.11 is located in the countersunk threaded hole, the other end of the thimble 2.10 is sleeved with a spring pre-tightening nut 2.2, one end of the spring pre-tightening nut 2.2 is in threaded connection with the follow-up block 2.6, the other end extends out of the countersunk threaded hole of the mounting seat 2.7, the spring pre-tightening nut 2.2 is rotated clockwise to push the compression spring 2.11 and the thimble 2.10 to move forward, when the thimble boss 2.4 contacts the inner wall of the follow-up square 2.6, the thimble boss does not move forward any more, the compression spring 2.11 is compressed, the pretightening force of the thimble 2.10 can be adjusted according to the depth of the spring pretightening nut 2.2 screwed into the countersunk head threaded hole, the thimble 2.10 is always in a pressing state, when the mechanism approaches to the L-shaped gasket 2.1, the thimble 2.10 contacts the L-shaped gasket first, the mechanism is continuously pushed, the thimble 2.10 compresses the compression spring 2.1, and the follow-up block 2.6 continuously approaches to the L-shaped gasket 2.1 until the follow-up block 2.6 contacts the L-shaped gasket 2.1.
The working principle of clamping the L-shaped gasket is as follows:
setting the thickness difference of an L-shaped gasket 2.1 as the thicknesses of two specifications (4mm and 5mm), and enabling the thimble to protrude out of the follow-up square 2.6(2 mm);
in the clamping process, the ejector pins firstly contact the 5mm L-shaped gasket, the mechanism is continuously moved, the ejector pins contacting the 5mm L-shaped gasket do not move, but can compress the compression springs 2.11 to the ejector pins to contact the 4mm L-shaped gasket, the ejector pins contacting the 4mm L-shaped gasket protrude the follow-up square 2.6(2mm), the ejector pins contacting the 5mm L-shaped gasket protrude the follow-up square 2.6(1mm), the mechanism is continuously moved, all the ejector pins do not move, but can compress the compression springs 2.1 to the follow-up square to contact the 5mm L-shaped gasket, the follow-up square cannot move forward, the 5mm L-shaped gasket is simultaneously compressed by the ejector pins and the follow-up square, the 4mm L-shaped gasket is only compressed by the ejector pins, and the batch compression function of the L-shaped gaskets with different.
Taking out the L-shaped gasket: and the second handle 2.3 is rotated anticlockwise, the second threaded shaft 2.9 rotates along with the rotation, the L-shaped gasket clamping block assembly retreats along the axial direction of the second threaded shaft 2.9, the ejector pin 2.10 retreats along with the rotation, the compression state is released, and the L-shaped gasket 2.1 is taken out.
Roller shaft II:
installing and clamping the roller shaft: as shown in fig. 1 to 5, a roller shaft 1.12 is horizontally loaded into a clamping groove formed between each V-shaped block and each V-shaped block in a roller shaft clamp 1, one end of the roller shaft 1.12 is in contact with a roller shaft positioning gasket 2.5, a first handle 1.8 is rotated clockwise, a first threaded shaft 1.6 rotates with follow-up, a pressing block 1.5 advances along the first threaded shaft 1.6, an end follow-up V-shaped block 1.4 advances with the pressing block 1.5, a return spring 1.14 is compressed along a spring guide shaft 1.13, a middle V-shaped block 1.3 advances until each V-shaped block clamps the roller shaft 1.12, and loading work is completed.
When in work: as shown in fig. 6 and 9, during the first machining, the side face and the face of the milling cutter are positioned right to set the tool 1.10.1 on the right side of the one-sided right tool setting surface of the tool setting block 1.10, the workpiece is machined along the 1.6 axial direction of the first threaded shaft until the one-sided machining is completed, the milling cutter is moved to the other face of the clamp, the milling cutter is set along the 1.1.1 one-sided tool setting surface on the left side, and the workpiece is machined along the 1.6 axial direction of the first threaded shaft until the machining is completed; and during secondary machining, the first cutter directly machines the workpiece along the 1.6 axial direction of the first threaded shaft until the single-side machining is finished, the milling cutter is moved to the other side of the clamp, the milling cutter carries out single-side tool setting on the left tool setting surface 1.1.1, and the workpiece is machined along the 1.6 axial direction of the first threaded shaft until the machining is finished.
Taking out the roller shaft: the first handle 1.8 is rotated anticlockwise, the first threaded shaft 1.6 rotates in a follow-up mode, the pressing block 1.5 retreats along the first threaded shaft 1.6, the return spring 1.14 extends along the spring guide shaft 1.13, the return spring 1.14 pushes the middle V-shaped block 1.3 and the end follow-up V-shaped block 1.4 to retreat until the roller shaft 1.12 is released from a pressing state, the roller shaft is taken out from the horizontal direction, and the unloading work is completed.
Claims (6)
1. A milling machine fixture combining a roller shaft and an L-shaped gasket of a railway freight car bogie is characterized by comprising an L-shaped gasket fixture (2) and a roller shaft fixture (1), wherein the L-shaped gasket fixture (2) comprises a mounting seat (2.7) and an L-shaped gasket clamping block, a U-shaped groove (2.8) is formed in the mounting seat (2.7), a follow-up square block (2.6) is formed in the L-shaped gasket clamping block, the follow-up square block (2.6) is positioned in the U-shaped groove (2.8) of the mounting seat, a threaded shaft hole is formed in the middle of the follow-up square block (2.6), countersunk head threaded screw holes are uniformly distributed in two sides of the threaded shaft hole, corresponding threaded shaft holes and countersunk screw holes are formed in the outer side wall of the mounting seat (2.7), a second threaded shaft (2.9) is mounted in the threaded shaft holes in the middle of the follow-up square block (2.6) and the mounting seat (2.7), a second threaded shaft (2.9) is mounted at the outer end of the second threaded shaft (2.3), and a thimble (10.10) of the thimble of the follow-up square, one end of the thimble is sleeved with a compression spring (2.11), the other end of the thimble (2.10) is sleeved with a spring pre-tightening nut (2.2), one end of the spring pre-tightening nut (2.2) is in threaded connection with the follow-up square block (2.6), the other end of the spring pre-tightening nut extends out of a countersunk head threaded hole of the mounting seat (2.7), and a roller shaft positioning gasket (2.5) is mounted at the tail part of the inner side of the mounting seat (2.7); roller axle anchor clamps (1) are including base (1.11), V type piece and reset spring (1.14), base (1.11) one end installation left side location feeler block (1.1), other end installation right side location feeler block (1.10), install fixed V type piece (1.2) on the left side location feeler block (1.1), end follow-up V type piece (1.4) is installed to base (1.11) other end, install middle part V type piece (1.3) between fixed V type piece (1.2) and end follow-up V type piece (1.4), fixed V type piece (1.2), the bottom of middle part V type piece (1.3) and end follow-up V type piece (1.4) sets up the countersunk hole respectively, open pore installation first threaded shaft (1.6) on the right side location piece (1.10), briquetting (1.5) is installed to first threaded shaft (1.6) one end, briquetting (1.5) contact jaw follow-up V type piece (1.4), first threaded shaft (1.6) is located between left side location feeler block (1.1.1.1) and right side location feeler block (1.2), the other end location (1.1.1.10) is located first threaded shaft (1.1.2) and handle piece (1.1.1.1., Spring guide shafts (1.13) are arranged at the lower ends of the middle V-shaped block (1.3) and the end follow-up V-shaped block (1.4), return springs (1.14) are sleeved on the spring guide shafts (1.13), and the return springs (1.14) are respectively arranged in countersunk holes corresponding to the fixed V-shaped block (1.2), the middle V-shaped block (1.3) and the end follow-up V-shaped block (1.4).
2. The jig of claim 1, wherein the thimble boss (2.4) is provided at one end of the thimble, and the thimble boss (2.4) is located in a countersunk threaded hole of the follower block (2.6).
3. The jig of claim 1, wherein a fixing nut (1.7) is sleeved in a hole of the right positioning feeler block (1.10), and a first threaded shaft (1.6) is mounted on the fixing nut (1.7).
4. The wagon bogie roller shaft and L-shaped shim combination milling machine fixture as claimed in claim 1, wherein the spring guide shaft (1.13) passes through the right positioning feeler block (1.10).
5. The jig of claim 1, wherein the base (1.11) is provided with a limiting plate (1.15).
6. The jig of claim 1, wherein the left tool setting surface (1.1.1) is provided on the upper plane of the left positioning feeler block (1.1) and both sides of the fixed V-shaped block (1.2), and the right tool setting surface (1.10.1) is provided on the upper plane and both sides of the right positioning feeler block (1.10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110485592.0A CN113070705B (en) | 2021-04-30 | Combined milling machine fixture for roller shaft and L-shaped gasket of bogie of railway wagon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110485592.0A CN113070705B (en) | 2021-04-30 | Combined milling machine fixture for roller shaft and L-shaped gasket of bogie of railway wagon |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113070705A true CN113070705A (en) | 2021-07-06 |
| CN113070705B CN113070705B (en) | 2024-07-16 |
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