CN108621054B - Correction device and correction method for nut seat of vertical machining center - Google Patents
Correction device and correction method for nut seat of vertical machining center Download PDFInfo
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- CN108621054B CN108621054B CN201810542063.8A CN201810542063A CN108621054B CN 108621054 B CN108621054 B CN 108621054B CN 201810542063 A CN201810542063 A CN 201810542063A CN 108621054 B CN108621054 B CN 108621054B
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- nut seat
- correction
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- workbench
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a correction device and a correction method for a nut seat of a vertical machining center, which belong to the technical field of vertical machining center assembly and comprise a saddle and a workbench, wherein the workbench is connected with the saddle through a sliding block, a lead screw, a nut seat, a motor seat and a tail end seat are arranged on the saddle, the saddle is connected with the workbench through the lead screw, two ends of the lead screw are respectively fixed to the saddle through the motor seat and the tail end seat, the lead screw is connected with the workbench through the nut seat, the nut seat and the workbench are of a split type structure, a check rod is fixedly arranged at the axis of the nut seat, a leveling rod is arranged outside the check rod and is placed close to a reference surface of a sliding block mounting side on the workbench, a correction block is arranged between the leveling rod and the check rod, two ends of the leveling rod are respectively close to the reference surface of the correction block, so that the coaxiality correction of the nut seat, the motor seat and the tail end seat is realized, the distance between the axis of the nut seat and the installation side of the sliding block is ensured through the correction block, and the precision correction of the nut seat is realized, and the problem in the prior art is solved.
Description
Technical Field
The invention relates to a correction device and a correction method for a nut seat of a vertical machining center, and belongs to the technical field of vertical machining center assembly.
Background
The X-axis transmission system of the vertical machining center is characterized in that the nut seat adopts a split structure, and the coaxiality of the nut seat, the motor seat and the tail end seat is corrected by adopting the following method at present: the motor cabinet, the tail end seat and the nut seat are respectively provided with the inspection rod, the marble Dan Pingche is placed close to the reference surface of the installation side of the sliding block of the workbench, the distances from the sliding block side reference to the motor cabinet inspection rod and from the marble to the nut seat inspection rod are respectively measured by using the dial indicator, the nut seat is adjusted, the two-distance errors are ensured to be in the required range, and the nut seat correction is completed.
The method for correcting the nut seat needs to measure the difference value of two distances for many times, has low efficiency, and the two procedures of motor seat, tail end seat assembly and nut seat assembly must be carried out simultaneously, so that the modularized assembly requirement cannot be met.
Disclosure of Invention
The invention aims to provide a correction device and a correction method for a nut seat of a vertical machining center, which ensure the distance between the axis of the nut seat and the side surface of a sliding block installation side by a correction block, realize the correction of the precision of the nut seat and solve the problems in the prior art.
The invention relates to a correction device for a nut seat of a vertical machining center, which comprises a saddle and a workbench, wherein the workbench is positioned above the saddle, the workbench is connected with the saddle through a sliding block, a lead screw, a nut seat, a motor seat and a tail end seat are arranged on the saddle, the saddle is connected with the workbench through the lead screw, two ends of the lead screw are respectively fixed to the saddle through the motor seat and the tail end seat, the lead screw is connected with the workbench through the nut seat, the nut seat and the workbench are of a split structure, a check rod is fixedly arranged at the axis of the nut seat, the check rod is positioned above the workbench and parallel to the lead screw, a leveling rule is arranged outside the check rod and is tightly attached to a reference surface of a sliding block on the workbench, the leveling rule and the check rod are arranged on the same level line, the leveling rule and two ends of the check rod are tightly attached to reference surfaces of the correction block, the distance and the parallelism between the axis of the nut seat and the reference surface of the sliding block are ensured, and coaxiality correction of the nut seat and the motor seat and the tail end seat is realized.
The correction block comprises a gauge block, a balancing weight and a connecting screw, wherein the balancing weight is positioned above the gauge block and is connected through the connecting screw.
The gauge block comprises a surface A, a surface B and a surface C, wherein the surface A is parallel to the surface B, the surface C is perpendicular to the surface A and the surface B, the surface C is contacted with the upper surface of the flat ruler, the surface B is contacted with the side surface of the flat ruler, and the surface A is contacted with the gauge rod.
The two correction blocks are matched for use, and the two ends of the leveling ruler and the checking rod are clung to the reference surfaces of the two correction blocks.
During operation, two equal-thickness correction blocks are manufactured according to the required size, the distance between the axis of the bearing hole of the nut seat and the surface of the installation side of the sliding block is ensured through the correction blocks, and the accuracy correction of the nut seat is realized. The check rod is fixed to the nut seat by using the screw, the flat ruler is placed close to the reference surface of the installation side of the sliding block of the workbench, the two correction blocks are placed close to the flat ruler, the C surface is contacted with the upper surface of the flat ruler, the B surface is contacted with the side surface of the flat ruler, the nut seat 2 is moved, the two ends of the check rod 3 are tightly attached to the A surface of the two correction blocks 5, the distance and the parallelism between the axis of the nut seat 2 and the reference surface of the installation side of the sliding block of the workbench 1 can be ensured, the screw is fixed by the nut seat 2, and the correction of the nut seat is completed.
The dimension between the face A and the face B of the gauge block is a, the two correction blocks are matched for paired grinding, and the difference value of the dimension a is not more than 0.005mm.
According to the distance between the axis of the nut seat and the side of the installation surface of the sliding block of the workbench and the specification of the checking rod, the dimension a of the A surface and the B surface of the gauge block is determined, the parallelism of the A surface and the B surface and the perpendicularity of the C surface and the A, B surface are ensured during processing, the gauge block and the correction block are connected by using the screw 8, two correction blocks 5 are required to be matched for use during assembly, and the difference value of the dimension a is required to be ensured to be within 0.005mm by the two matched correction blocks 5.
The screw nut penetrates into the nut seat and is fixed through the end face.
The gap between the nut seat and the screw nut shaft hole is 0.5mm.
The invention relates to a correction method of a nut seat of a vertical machining center, which comprises the following steps:
s1: fixing the check rod on the nut seat by using a screw, and placing the flat ruler against a reference surface of the sliding block mounting side on the workbench;
s2: placing the two correction blocks closely to the flat ruler, wherein the C surface of the gauge block is contacted with the upper surface of the flat ruler, and the B surface of the gauge block is contacted with the side surface of the flat ruler;
s3: the nut seat is moved, so that two ends of the check rod are tightly attached to the A surface of the gauge block in the two correction blocks, and the distance and the parallelism between the axis of the nut seat and the side surface of the installation side of the sliding block of the workbench can be ensured;
s4: and locking the nut seat fixing screw to finish the correction of the nut seat.
The dimension from the surface A to the surface B of the gauge block is a, and the dimension from the surface A to the surface B of the gauge block is determined according to the distance between the axis of the nut seat and the side surface of the installation side of the sliding block on the workbench and the gauge stick specification.
Compared with the prior art, the invention has the following beneficial effects:
according to the correction device and the correction method for the vertical machining center nut seat, the distance between the axis of the nut seat and the side surface of the installation side of the sliding block is ensured by the correction blocks, the reference surface of the installation side of the sliding block and the checking rod are ensured to be on the same horizontal line by means of the leveling rule, two correction blocks are placed between the leveling rule and the checking rod, two ends of the leveling rule and the checking rod are respectively clung to the reference surfaces of the two correction blocks, the distance and the parallelism between the axis of the nut seat and the reference surface of the installation side of the sliding block are further ensured, the coaxiality correction of the nut seat, the motor seat and the tail end seat is realized, the adjustment is carried out without depending on repeated measurement of a dial gauge, and the correction efficiency of the nut seat is improved; the nut seat assembly device can be separated from the motor seat and the tail end seat assembly process, and is independently used for nut seat assembly, so that modularized assembly is facilitated, nut seat precision correction is realized, and the problems in the prior art are solved.
Drawings
FIG. 1 is a front view of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a correction block according to an embodiment of the present invention;
FIG. 3 is a top view of an embodiment of the present invention;
FIG. 4 is a top view of a machine tool X-axis drive system in accordance with an embodiment of the present invention;
FIG. 5 is a block diagram of a workbench and a nut seat in a machine tool X-axis transmission system in an embodiment of the invention;
FIG. 6 is a schematic view of a coupling of a lead screw nut to a nut seat in an embodiment of the invention;
FIG. 7 is a side view of a lead screw nut coupled to a nut mount in accordance with an embodiment of the present invention;
in the figure: 1. a work table; 2. a nut seat; 3. a rod is checked; 4. a correction block; 5. a flat ruler; 6. a gauge block; 7. a coupling screw; 8. balancing weight; 9. a motor base; 10. a screw rod; 11. a lead screw nut; 12. a saddle; 13. a tail end seat; 14. a sliding block.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
example 1:
as shown in fig. 1-7, the correction device for the nut seat of the vertical machining center comprises a saddle 12 and a workbench 1, wherein the workbench 1 is positioned above the saddle 12, the workbench 1 is connected with the saddle 12 through a sliding block 14, a lead screw 10, a nut seat 2, a motor seat 9 and a tail end seat 13 are arranged on the saddle 12, the saddle 12 is connected with the workbench 1 through the lead screw 10, two ends of the lead screw 10 are respectively fixed to the saddle 12 through the motor seat 9 and the tail end seat 13, the lead screw 10 is connected with the workbench 1 through the nut seat 2, the nut seat 2 and the workbench 1 are of a split structure, a check rod 3 is fixedly arranged at the axis of the nut seat 2, the check rod 3 is positioned above the workbench 1 and parallel to the lead screw 10, a flat ruler 5 is arranged outside the check rod 3 and is tightly attached to the reference surface of the sliding block 14 on the workbench 1, correction blocks 4 are arranged between the flat ruler 5 and the check rod 3, two ends of the flat ruler 5 and the check rod 3 are tightly attached to the reference surface of the correction blocks 4, and the coaxiality between the axis of the nut seat 2 and the reference surface of the sliding block 14 and the tail end seat is ensured, and the coaxiality between the axis of the flat ruler 2 and the motor seat is 9 and the motor seat is realized.
To further illustrate the above embodiment, the correction block 4 includes a gauge block 6, a weight block 8, and a coupling screw 7, the weight block 8 being located above the gauge block 6 and coupled by the coupling screw 7.
To further illustrate the above embodiment, the gauge block 6 includes a surface a, a surface B, and a surface C, where the surface a is parallel to the surface B, the surface C is perpendicular to the surface a, the surface B, the surface C contacts the upper surface of the flat rule 5, the surface B contacts the side surface of the flat rule 5, and the surface a contacts the dipstick 3.
In order to further explain the above embodiment, the correction blocks 4 include two correction blocks 4, and the flat ruler 5 and two ends of the dipstick 3 are closely attached to the reference surfaces of the two correction blocks 4.
To further illustrate the above embodiment, the dimension between the a-side and the B-side of the gauge block 6 is a, and the two correction blocks 4 are matched for pair grinding, and the difference between the dimension a is not more than 0.005mm.
To further illustrate the above embodiment, the nut seat 2 is coupled with a lead screw nut 11, and the lead screw nut 11 penetrates into the nut seat 2 and is fixed by an end surface.
To further explain the above embodiment, the clearance between the nut seat 2 and the shaft hole of the lead screw nut 11 is 0.5mm.
The working principle of this embodiment 1 is: as shown in fig. 4-7, in order to realize an X-axis transmission system of a machine tool, a saddle 12 is connected with a workbench 1 through a lead screw 10, two ends of the lead screw 10 are respectively fixed to the saddle 12 through a motor seat 9 and a tail end seat 13, and the connection with the workbench 1 is completed through a lead screw nut 11 and a nut seat 2, so that the X-axis transmission is realized, wherein the nut seat 2 and the workbench 1 are of a split structure, and the coaxiality of the nut seat 2, the motor seat 9 and the tail end seat 13 is in a required range after the workbench 1 is fixed to the saddle 12 through a sliding block 14 during assembly, and interference between the lead screw nut 11 and the nut seat 2 is avoided;
the connection mode of the screw nut 11 and the nut seat 2 is shown in fig. 6-7, the screw nut 11 penetrates into the nut seat 2 and is fixed through the end face, and the gap between the nut seat 2 and the inner shaft hole of the screw nut 11 is 0.5mm;
according to the distance between the axis of the nut seat 2 and the side surface of the sliding block 14 of the workbench 1 and the specification of the check rod 3, the dimension a of the A surface and the B surface of the gauge block 6 is determined, the parallelism of the A surface and the B surface and the perpendicularity of the C surface and the A, B surface are ensured during processing, and the gauge block 6 and the correction block 4 are connected by using the connecting screw 7.
During correction, as shown in fig. 1-3, the check rod 3 is fixed to the nut seat 2 by using a screw, the flat ruler 5 is placed close to the reference surface of the installation side of the sliding block 14 of the workbench 1, the two correction blocks 4 are placed close to the flat ruler 5, the C surface is contacted with the upper surface of the flat ruler 5, the B surface is contacted with the side surface of the flat ruler 5, the nut seat 2 is moved, the two ends of the check rod 3 are tightly contacted with the A surface of the two correction blocks 4, the distance and the parallelism between the axis of the nut seat 2 and the surface of the installation side of the sliding block 14 of the workbench 1 can be ensured, the nut seat 2 is locked by fixing the screw, the correction of the nut seat 2 is completed, and the coaxiality between the nut seat 2, the motor seat 9 and the tail end seat 13 can be ensured to be within 0.05mm by correcting by the method.
Example 2:
the invention relates to a correction method of a nut seat of a vertical machining center, which comprises the following steps:
s1: the check rod 3 is fixed on the nut seat 2 by using a screw, and the flat ruler 5 is placed against the datum plane of the installation side of the sliding block 14 on the workbench 1;
s2: two correction blocks 4 are tightly attached to the flat ruler 5, wherein the C surface of the gauge block 6 is contacted with the upper surface of the flat ruler 5, and the B surface of the gauge block 6 is contacted with the side surface of the flat ruler 5;
s3: the nut seat 2 is moved, so that two ends of the detecting rod 3 are tightly attached to the A surface of the gauge block 6 in the two correction blocks 4, and the distance and the parallelism between the axis of the nut seat 2 and the side surface of the installation side of the sliding block 14 of the workbench 1 can be ensured;
s4: and the nut seat 2 is locked to fix the screw, so that the correction of the nut seat 2 is completed.
To further explain the above embodiment, the dimension a from the a surface to the B surface of the gauge block 6 is a, and the dimension a from the a surface to the B surface of the gauge block 6 is determined according to the distance between the axis of the nut seat 2 and the mounting side of the slide block 14 on the table 1 and the gauge of the gauge stick 3.
The working principle of the embodiment is as follows: according to the correction device of the vertical machining center nut seat in the embodiment 1, the leveling rod 5 is used for ensuring that the reference surface of the installation side of the sliding block 14 and the detecting rod 3 are on the same horizontal line, two correction blocks 4 are placed between the leveling rod 5 and the detecting rod 3, the two ends of the leveling rod 5 and the detecting rod 3 are tightly attached to the reference surfaces of the two correction blocks 4, and further, the distance and the parallelism between the axis of the nut seat 2 and the reference surface of the installation side of the sliding block 14 are ensured, the coaxiality correction of the nut seat 2, the motor seat 9 and the tail end seat 13 is realized, the adjustment is carried out without depending on repeated measurement of a dial gauge, and the correction efficiency of the nut seat 2 is improved; the assembly process of the nut seat 2 can be separated from the assembly process of the motor seat 9 and the tail end seat 13, and the nut seat 2 is assembled independently, so that the modular assembly is realized, and the accuracy correction of the nut seat 2 is realized.
By adopting the correction device and the correction method for the vertical machining center nut seat, which are described above with reference to the accompanying drawings, the correction block 4 ensures the distance between the axis of the nut seat 2 and the side surface of the installation side of the sliding block 14, so that the accuracy correction of the nut seat 2 is realized, and the problems in the prior art are solved. The present invention is not limited to the embodiments described, but is capable of modification, alteration, replacement and variation in embodiments without departing from the spirit and scope of the present invention.
Claims (6)
1. The utility model provides a correcting unit of vertical machining center nut seat, includes saddle (12) and workstation (1), and workstation (1) are located the top of saddle (12), and saddle (12) are linked through slider (14) to workstation (1), its characterized in that: the saddle (12) is provided with a screw rod (10) and a nut seat (2), the motor seat (9) and the tail end seat (13) are connected with the workbench (1) through the lead screw (10), two ends of the lead screw (10) are respectively fixed to the saddle (12) through the motor seat (9) and the tail end seat (13), the lead screw (10) is connected with the workbench (1) through the nut seat (2), the nut seat (2) and the workbench (1) are of split type structures, the detecting rod (3) is fixedly arranged at the axle center of the nut seat (2), the detecting rod (3) is positioned above the workbench (1) and is parallel to the lead screw (10), a flat ruler (5) is arranged outside the detecting rod (3) and is closely attached to the installation side datum plane of the sliding block (14) on the workbench (1), the flat ruler (5) and the detecting rod (3) are on the same horizontal line, a correction block (4) is arranged between the flat ruler (5) and the detecting rod (3), two ends of the flat ruler (5) are closely attached to the datum plane of the correction block (4), the axle center of the nut seat (2) and the installation side of the sliding block (14) are guaranteed, and the coaxiality of the nut seat (9) is guaranteed; the correction block (4) comprises a gauge block (6), a balancing weight (8) and a connecting screw (7), wherein the balancing weight (8) is positioned above the gauge block (6) and is connected through the connecting screw (7); the gauge block (6) comprises an A surface, a B surface and a C surface, wherein the A surface is parallel to the B surface, the C surface is perpendicular to the A surface and the B surface, the C surface is contacted with the upper surface of the flat ruler (5), the B surface is contacted with the side surface of the flat ruler (5), and the A surface is contacted with the detecting rod (3); the two correction blocks (4) are matched with each other, and the leveling ruler (5) and the two ends of the check rod (3) are clung to the datum planes of the two correction blocks (4).
2. The correction device for a vertical machining center nut seat according to claim 1, wherein: the dimension between the A surface and the B surface of the gauge block (6) is a, the two correction blocks (4) are matched for paired grinding, and the difference of the dimension a is not more than 0.005mm.
3. The correction device for a vertical machining center nut seat according to claim 1, wherein: the nut seat (2) is connected with a screw nut (11), and the screw nut (11) penetrates into the nut seat (2) and is fixed through the end face.
4. A correction device for a vertical machining center nut seat according to claim 3, characterized in that: the gap between the nut seat (2) and the shaft hole of the screw nut (11) is 0.5mm.
5. A correction method for a vertical machining center nut seat, applied to the correction device for the vertical machining center nut seat according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:
s1: the detecting rod (3) is fixed on the nut seat (2) by using a screw, and the flat ruler (5) is closely attached to a reference surface of the installation side of the upper sliding block (14) of the workbench (1);
s2: two correction blocks (4) are tightly attached to the flat ruler (5), wherein the C surface of the gauge block (6) is contacted with the upper surface of the flat ruler (5), and the B surface of the gauge block (6) is contacted with the side surface of the flat ruler (5);
s3: the nut seat (2) is moved, so that two ends of the detecting rod (3) are tightly attached to the A surface of the gauge block (6) in the two correction blocks (4), and the distance and the parallelism between the axis of the nut seat (2) and the mounting side surface of the sliding block (14) of the workbench (1) can be ensured;
s4: and the locking nut seat (2) is used for fixing the screw, so that the correction of the nut seat (2) is completed.
6. The method for calibrating a nut seat in a vertical machining center according to claim 5, wherein: and in the steps S2 and S3, the dimension from the A surface to the B surface of the gauge block (6) is a, and the dimension from the A surface to the B surface of the gauge block (6) is determined according to the distance between the axis of the nut seat (2) and the mounting side of the sliding block (14) on the workbench (1) and the specification of the check rod (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810542063.8A CN108621054B (en) | 2018-05-30 | 2018-05-30 | Correction device and correction method for nut seat of vertical machining center |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810542063.8A CN108621054B (en) | 2018-05-30 | 2018-05-30 | Correction device and correction method for nut seat of vertical machining center |
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| Publication Number | Publication Date |
|---|---|
| CN108621054A CN108621054A (en) | 2018-10-09 |
| CN108621054B true CN108621054B (en) | 2023-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810542063.8A Active CN108621054B (en) | 2018-05-30 | 2018-05-30 | Correction device and correction method for nut seat of vertical machining center |
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| JPH07318341A (en) * | 1994-05-20 | 1995-12-08 | Yotaro Hatamura | Rectilinear motion apparatus equipped with deformation-amount detection means and with displacement scale |
| CN102179699A (en) * | 2011-03-29 | 2011-09-14 | 朝阳博文机床有限公司 | Installing and positioning method of linear guide rail |
| CN202344342U (en) * | 2011-11-29 | 2012-07-25 | 南京嘉翼精密机器制造有限公司 | Screw installing and debugging fixture for numerically-controlled machine tool |
| CN202372103U (en) * | 2011-12-21 | 2012-08-08 | 山东赛尔机械导轨有限公司 | Linear guide rail pair detection device |
| CN103394928A (en) * | 2013-07-25 | 2013-11-20 | 浙江法拿克机械科技有限公司 | Numerical control machine tool with screw convenient to mount |
| CN106475834A (en) * | 2015-08-27 | 2017-03-08 | 成都飞机工业（集团）有限责任公司 | A kind of method of lead screw shaft bearings centering |
| CN208231636U (en) * | 2018-05-30 | 2018-12-14 | 山东蒂德精密机床有限公司 | The means for correcting of vertical machining centre nut seat |
-
2018
- 2018-05-30 CN CN201810542063.8A patent/CN108621054B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07318341A (en) * | 1994-05-20 | 1995-12-08 | Yotaro Hatamura | Rectilinear motion apparatus equipped with deformation-amount detection means and with displacement scale |
| CN102179699A (en) * | 2011-03-29 | 2011-09-14 | 朝阳博文机床有限公司 | Installing and positioning method of linear guide rail |
| CN202344342U (en) * | 2011-11-29 | 2012-07-25 | 南京嘉翼精密机器制造有限公司 | Screw installing and debugging fixture for numerically-controlled machine tool |
| CN202372103U (en) * | 2011-12-21 | 2012-08-08 | 山东赛尔机械导轨有限公司 | Linear guide rail pair detection device |
| CN103394928A (en) * | 2013-07-25 | 2013-11-20 | 浙江法拿克机械科技有限公司 | Numerical control machine tool with screw convenient to mount |
| CN106475834A (en) * | 2015-08-27 | 2017-03-08 | 成都飞机工业（集团）有限责任公司 | A kind of method of lead screw shaft bearings centering |
| CN208231636U (en) * | 2018-05-30 | 2018-12-14 | 山东蒂德精密机床有限公司 | The means for correcting of vertical machining centre nut seat |
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| CN108621054A (en) | 2018-10-09 |
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