Positioning jig for CNC machining of high-precision parts

Abstract

The invention relates to the technical field of positioning jigs, and discloses a positioning jig for CNC machining of high-precision parts, which comprises a fixing assembly, a driving assembly and a clamping assembly, and is characterized in that the driving assembly and the clamping assembly are both located at the top of the fixing assembly, and the driving assembly corresponds to the clamping assembly; the clamping block is fixed to the outer side of the square column through mutual magnetic attraction of the magnetic block and the iron block so that the clamping block can be directly pulled, inserted and replaced, and when the second piston column is separated from the locking hole of the plug pin, the clamping plate and the plug pin can be directly pulled, inserted and replaced. The clamping plates and the clamping blocks matched with the shapes of the parts can be quickly replaced according to the shapes of the different parts, so that the adaptability of the device is improved; the clamping plate can be locked to the top of the bottom plate through high-pressure gas, meanwhile, the clamping block can be driven to move forwards to position and fix the part in the clamping plate, and therefore it is guaranteed that the device can stably and reliably position and fix the part.

Description

Technical Field

[0001] The invention belongs to the technical field of positioning jigs, and in particular relates to a positioning jig used for CNC machining of high-precision parts. Background Art

[0002] CNC machining of high-precision parts usually requires the use of positioning jigs to ensure accurate positioning and stable fixation of the workpiece, and to perform high-precision engraving, cutting, drilling and other processing operations. Positioning jigs generally fix the workpiece firmly on the processing platform through clamping, adsorption or other fixing methods, and can provide precise positioning reference points or reference surfaces for processing, so that the processing process can perform more precise operations based on the determined reference position.

[0003] At present, when performing CNC high-precision machining on special-shaped parts, most of them need to customize special positioning fixtures according to the shape of the special-shaped parts. However, after using such customized positioning fixtures, it is difficult to position and fix parts of other shapes, thereby reducing the adaptability of positioning fixtures for positioning and fixing special-shaped parts. For this reason, we propose a positioning fixture for CNC machining of high-precision parts. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a positioning jig for CNC machining of high-precision parts, which effectively solves the problem that when performing CNC high-precision machining on special-shaped parts, most of them need to customize special positioning jigs according to the shape of the special-shaped parts. However, after use, such customized positioning jigs are difficult to position and fix parts of other shapes, thereby reducing the adaptability of the positioning jigs for positioning and fixing special-shaped parts.

[0005] To achieve the above object, the present invention provides the following technical solution: a positioning fixture for CNC machining of high-precision parts, comprising a fixing assembly, a driving assembly and a clamping assembly, wherein the driving assembly and the clamping assembly are both located on the top of the fixing assembly, and the driving assembly corresponds to the clamping assembly;

[0006] The fixing assembly includes a base plate, bolt holes are evenly opened on the top of the base plate, insertion holes are evenly opened on the top of the base plate, a first air duct is opened on the right side of the base plate, a second air duct is evenly opened on the front side of the first air duct, the second air duct is connected with the insertion hole, and a group of exhaust valves and intake valves are respectively arranged on the left and right sides of the base plate, and the exhaust valves and intake valves are both connected with the first air duct.

[0007] Preferably, the driving assembly includes a hollow tube and a limiting ring, a first spring is provided on the rear side of the inner wall of the hollow tube, the rear side of the hollow tube is connected to an air supply pipe, a first piston column is provided on the front side of the first spring, the first piston column is provided inside the hollow tube, a square column is provided on the front side of the first piston column, the square column is located on the front side of the hollow tube, a magnetic block is provided on the front side of the square column, a second spring is provided on the front side of the limiting ring, and a second piston column is provided on the front side of the second spring.

[0008] Preferably, the clamping assembly includes a clamping plate and a clamping block, the bottom of the clamping plate is evenly provided with threaded holes, a threaded column is screwed into the threaded hole, a latch is provided at the bottom of the threaded column, a locking hole is provided on the rear side of the latch, an anti-slip pad is provided on the front side of the clamping block, a square groove is provided on the rear side of the clamping block, and an iron block is provided in the square groove.

[0009] Preferably, the hollow tubes are evenly arranged on the top of the bottom plate, the air delivery pipe is connected to the first air channel, the square column is inserted into the square groove of the clamping block, and the magnetic block and the iron block are magnetically attracted to each other.

[0010] Preferably, the limiting ring is fixedly arranged in the second air passage, the second spring and the second piston column are slidably arranged in the second air passage, and the second piston column corresponds to the locking hole of the latch.

[0011] Preferably, the clamping plate is placed on the top of the bottom plate, and the rear side of the outer side wall of the clamping plate is evenly provided with special-shaped placement grooves, the special-shaped placement grooves correspond to the clamping block, and the latch is inserted into the socket.

[0012] Preferably, a first groove is provided on the front side of the hollow tube, a second groove is evenly provided on the top of the base plate, a first annular groove is provided on the inner side wall of the first groove, a second annular groove is provided on the inner side wall of the second groove, a first sealing ring is provided in the first groove, a second sealing ring is provided in the second groove, the first sealing ring is located on the outer ring of the first piston column, the second sealing ring is located on the outer ring of the pin, a second retaining ring is provided on the outer side wall of the first sealing ring, a third retaining ring is provided on the outer side wall of the second sealing ring, the second retaining ring is clamped in the first annular groove, and the third retaining ring is clamped in the second annular groove.

[0013] Preferably, a group of installation grooves are provided on the upper and lower sides of the inner side walls of the locking hole of the latch, a third spring is arranged in the installation groove, a round head latch is provided on the outer side wall of the third spring, and a group of positioning holes are provided on the upper and lower sides of the second piston column, and the round head part of the round head latch corresponds to the positioning hole.

[0014] Preferably, a third annular groove is formed on the inner wall of the bolt hole, a sealing plug is inserted into the bolt hole, a first clamping ring is provided on the outer wall of the sealing plug, the first clamping ring is clamped in the third annular groove, and a pull strip is provided on the top of the sealing plug.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. When the high-pressure gas enters the second airway and the hollow tube through the first airway, it will push the second piston column and the first piston column to move forward. When the second piston column moves forward, it will lock the clamping plate on the top of the bottom plate through the latch, and when the first piston column moves forward, it will drive the clamping block to position and fix the parts in the clamping plate, so as to ensure that the device can stably and reliably position and fix the parts;

[0017] 2. The clamping block is fixed on the outside of the square column by the mutual magnetic attraction of the magnetic block and the iron block, so that it can be directly replaced by plugging and unplugging. When the second piston column is separated from the locking hole of the latch, the clamping plate and the latch can be directly replaced by plugging and unplugging. In this way, the device can quickly replace the clamping plate and the clamping block that match the shape of the parts according to the shape of different parts, thereby improving the adaptability of the device;

[0018] 3. The anti-slip pad can improve the clamping stability of the clamping block on the special-shaped parts located in the special-shaped placement groove of the clamping plate. The first sealing ring and the second sealing ring can prevent the debris generated by the fine processing of the parts from entering the hollow tube and the jack, thereby ensuring the service life and reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0020] In the attached picture:

[0021] Figure 1 This is a structural schematic diagram of a positioning fixture for CNC machining of high-precision parts according to the present invention;

[0022] Figure 2 This is a first right side sectional view of a positioning fixture for CNC machining of high-precision parts according to the present invention;

[0023] Figure 3 The present invention is a positioning fixture for CNC machining of high-precision parts Figure 2 A magnified view of part A;

[0024] Figure 4 This is a second right side sectional view of a positioning fixture for CNC machining of high-precision parts according to the present invention;

[0025] Figure 5 The present invention is a positioning fixture for CNC machining of high-precision parts Figure 4 A magnified view of part B;

[0026] Figure 6 The present invention is a partial front cross-sectional view of a positioning fixture for CNC machining of high-precision parts.

[0027] In the figure: 100, fixing assembly; 200, driving assembly; 300, clamping assembly; 1, bottom plate; 11, intake valve; 12, exhaust valve; 13, bolt hole; 131, pull rod; 132, first retaining ring; 133, sealing plug; 14, first air duct; 15, second air duct; 16, plug hole; 2, hollow tube; 21, air pipe; 22, first spring; 23, first piston column; 24, square column; 25, magnetic block; 26, second piston column; 27, second spring; 28, limiting ring; 3, clamping plate; 31, clamping block; 32, anti-slip pad; 33, iron block; 34, latch; 35, threaded column; 36, third spring; 37, round head latch; 4, first sealing ring; 41, second sealing ring; 42, second retaining ring; 43, third retaining ring. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] like Figure 1-Figure 6 As shown, the present invention provides a technical solution: a positioning fixture for CNC machining of high-precision parts, comprising a fixing assembly 100, a driving assembly 200 and a clamping assembly 300, wherein the driving assembly 200 and the clamping assembly 300 are both located on the top of the fixing assembly 100, and the driving assembly 200 corresponds to the clamping assembly 300;

[0030] The fixing assembly 100 includes a base plate 1, and bolt holes 13 are evenly opened on the top of the base plate 1. Bolts are used to penetrate the bolt holes 13 and connect with the threaded holes on the workbench of the CNC machine tool to fix the base plate 1 on the workbench of the CNC machine tool. Plug holes 16 are evenly opened on the top of the base plate 1, and a first air duct 14 is opened on the right side of the base plate 1. A second air duct 15 is evenly opened on the front side of the first air duct 14, and the second air duct 15 is connected to the plug hole 16. A group of exhaust valves 12 and intake valves 11 are fixedly arranged on the left and right sides of the base plate 1, respectively, and the exhaust valve 12 and the intake valve 11 are both connected to the first air duct 14.

[0031] The driving assembly 200 includes a hollow tube 2 and a limiting ring 28. A first spring 22 is fixedly provided on the rear side of the inner wall of the hollow tube 2. The rear side of the hollow tube 2 is connected to the air supply pipe 21. A first piston column 23 is fixedly provided on the front side of the first spring 22. The first piston column 23 is slidably provided inside the hollow tube 2. A square column 24 is fixedly provided on the front side of the first piston column 23. The square column 24 is located on the front side of the hollow tube 2. A magnetic block 25 is fixedly provided on the front side of the square column 24. A second spring 27 is fixedly provided on the front side of the limiting ring 28. A second piston column 26 is fixedly provided on the front side of the second spring 27.

[0032] The clamping assembly 300 includes a clamping plate 3 and a clamping block 31. The bottom of the clamping plate 3 is evenly provided with threaded holes, and a threaded column 35 is screwed into the threaded hole. A pin 34 is fixedly provided at the bottom of the threaded column 35, and a locking hole is provided on the rear side of the pin 34. An anti-slip pad 32 is fixedly provided on the front side of the clamping block 31, and a square groove is provided on the rear side of the clamping block 31, and an iron block 33 is fixedly provided in the square groove.

[0033] The hollow tube 2 is evenly fixed on the top of the base plate 1, the air delivery pipe 21 is connected to the first air channel 14, the square column 24 is inserted into the square groove of the clamping block 31, the magnetic block 25 and the iron block 33 are magnetically attracted to each other, and the clamping block 31 is fixed to the outside of the square column 24 by the mutual magnetic attraction between the magnetic block 25 and the iron block 33, so that it can be directly plugged in and out for replacement.

[0034] The limiting ring 28 is fixedly disposed in the second air passage 15 , the second spring 27 and the second piston column 26 are slidably disposed in the second air passage 15 , and the second piston column 26 corresponds to the locking hole of the latch 34 .

[0035] The clamping plate 3 is placed on the top of the bottom plate 1 , and the rear side of the outer wall of the clamping plate 3 is evenly provided with special-shaped placement grooves, which correspond to the clamping block 31 , and the latch 34 is inserted into the insertion hole 16 .

[0036] A first groove is provided on the front side of the hollow tube 2, and a second groove is evenly provided on the top of the bottom plate 1. A first annular groove is provided on the inner side wall of the first groove, and a second annular groove is provided on the inner side wall of the second groove. A first sealing ring 4 is inserted in the first groove, and a second sealing ring 41 is inserted in the second groove. The first sealing ring 4 is located on the outer ring of the first piston column 23, and the second sealing ring 41 is located on the outer ring of the pin 34. A second snap ring 42 is fixedly provided on the outer side wall of the first sealing ring 4, and a third snap ring 43 is fixedly provided on the outer side wall of the second sealing ring 41. The second snap ring 42 is clamped in the first annular groove, and the third snap ring 43 is clamped in the second annular groove.

[0037] A group of installation grooves are provided on the upper and lower sides of the inner side wall of the locking hole of the latch pin 34, and a third spring 36 is fixedly arranged in the installation groove. A round head latch pin 37 is fixedly arranged on the outer side wall of the third spring 36. A group of positioning holes are provided on the upper and lower sides of the second piston column 26, and the round head part of the round head latch pin 37 corresponds to the positioning hole.

[0038] A third annular groove is formed on the inner wall of the bolt hole 13, a sealing plug 133 is inserted into the bolt hole 13, a first retaining ring 132 is fixedly provided on the outer wall of the sealing plug 133, the first retaining ring 132 is clamped in the third annular groove, and a pull strip 131 is fixedly provided on the top of the sealing plug 133.

[0039] A method for using a positioning fixture for CNC machining of high-precision parts:

[0040] Step 1: Pull the pull rod 131 upward to drive the sealing plug 133 and the first retaining ring 132 to separate from the bolt hole 13. At this time, use a bolt to penetrate the bolt hole 13 and connect it with the threaded hole on the workbench of the CNC machine tool to fix the base plate 1 on the workbench of the CNC machine tool. Then insert the sealing plug 133 into the bolt hole 13, and make the first retaining ring 132 snap into the third annular groove to fix the sealing plug 133 in the bolt hole 13. The sealing plug 133 can prevent the debris generated by the processing of the parts fixed by the fixture from entering 13, so as to ensure that the bolts in the bolt hole 13 can be easily removed later, thereby ensuring the reliability of the disassembly and assembly of the fixture, connect the intake valve 11 to the high-pressure air pump, and close the exhaust valve 12, and then place the special-shaped parts in the special-shaped placement groove of the clamping plate 3.

[0041] Step 2: The high-pressure air pump inputs high-pressure gas into the first air channel 14 through the intake valve 11. The high-pressure gas will enter the second air channel 15 and the air pipe 21 along the first air channel 14. The high-pressure gas entering the air pipe 21 will enter the hollow tube 2 and push the first piston column 23 to move forward. The first piston column 23 drives the clamping block 31 to move forward through the square column 24 to resist the special-shaped parts in the special-shaped placement groove of the clamping plate 3, thereby completing the positioning and fixing of the parts. The high-pressure gas entering the second air channel 15 will push the second piston column 26 to move forward and insert it into the locking hole of the latch 34, thereby fixing the clamping plate 3 to the top of the base plate 1 through the latch 34. When the second piston column 26 is inserted into the locking hole of the latch 34, the third spring 36 will drive the round head part of the round head latch 37 to insert into the positioning hole of the second piston column 26, thereby improving the connection stability between the second piston column 26 and the latch 34.

[0042] Step three: The anti-slip pad 32 can improve the clamping stability of the clamping block 31 on the special-shaped parts located in the special-shaped placement groove of the clamping plate 3. The first sealing ring 4 and the second sealing ring 41 can prevent the debris generated by the fine processing of the parts from entering the hollow tube 2 and the plug hole 16, so as to ensure the service life and reliability of the device. The first sealing ring 4 and the second sealing ring 41 are respectively fixed in the first groove and the second groove by the second retaining ring 42 and the third retaining ring 43. When the first sealing ring 4 and the second sealing ring 41 are aged, they can be directly replaced by plugging and unplugging.

[0043] Step 4: Turn off the high-pressure air pump and open the exhaust valve 12 to discharge the high-pressure gas in the base plate 1 and the hollow tube 2. At this time, the first spring 22 and the second spring 27 use their own resilience to drive the first piston column 23 and the second piston column 26 to move backward and reset respectively. Since the clamping block 31 is fixed to the outside of the square column 24 by the mutual magnetic attraction of the magnetic block 25 and the iron block 33, it can be directly plugged in and replaced. At the same time, when the second piston column 26 is separated from the locking hole of the latch 34, the clamping plate 3 and the latch 34 can be directly pulled out, and then the latch 34 is rotated to separate the threaded column 35 from the clamping plate 3, so that the device can quickly replace the clamping plate 3 and the clamping block 31 that match the shape of the parts according to the shape of different parts, thereby improving the adaptability of the device.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning fixture for CNC machining of high-precision parts, comprising a fixing assembly (100), a driving assembly (200) and a clamping assembly (300), characterized in that: The driving assembly (200) and the clamping assembly (300) are both located on the top of the fixing assembly (100), and the driving assembly (200) corresponds to the clamping assembly (300); The fixing assembly (100) comprises a base plate (1), the top of the base plate (1) is uniformly provided with bolt holes (13), the top of the base plate (1) is uniformly provided with plug holes (16), the right side of the base plate (1) is uniformly provided with a first air passage (14), the front side of the first air passage (14) is uniformly provided with a second air passage (15), the second air passage (15) is connected to the plug hole (16), and a group of exhaust valves (12) and intake valves (11) are respectively arranged on the left and right sides of the base plate (1), and the exhaust valves (12) and intake valves (11) are both connected to the first air passage (14).

2. A positioning fixture for CNC machining of high-precision parts according to claim 1, characterized in that: The driving assembly (200) comprises a hollow tube (2) and a limiting ring (28); a first spring (22) is arranged on the rear side of the inner wall of the hollow tube (2); the rear side of the hollow tube (2) is connected to an air supply pipe (21); a first piston column (23) is arranged on the front side of the first spring (22); the first piston column (23) is arranged inside the hollow tube (2); a square column (24) is arranged on the front side of the first piston column (23); the square column (24) is located on the front side of the hollow tube (2); a magnetic block (25) is arranged on the front side of the square column (24); a second spring (27) is arranged on the front side of the limiting ring (28); and a second piston column (26) is arranged on the front side of the second spring (27).

3. A positioning fixture for CNC machining of high-precision parts according to claim 2, characterized in that: The clamping assembly (300) comprises a clamping plate (3) and a clamping block (31); threaded holes are evenly arranged at the bottom of the clamping plate (3); a threaded column (35) is screwed into the threaded hole; a latch (34) is arranged at the bottom of the threaded column (35); a locking hole is arranged at the rear side of the latch (34); an anti-slip pad (32) is arranged at the front side of the clamping block (31); a square groove is arranged at the rear side of the clamping block (31); an iron block (33) is arranged in the square groove.

4. The positioning fixture for CNC machining of high-precision parts according to claim 3 is characterized in that: The hollow tubes (2) are evenly arranged on the top of the bottom plate (1), the air delivery pipe (21) is connected to the first air channel (14), the square column (24) is inserted into the square groove of the clamping block (31), and the magnetic block (25) and the iron block (33) are magnetically attracted to each other.

5. The positioning fixture for CNC machining of high-precision parts according to claim 4, characterized in that: The limiting ring (28) is fixedly arranged in the second air channel (15), the second spring (27) and the second piston column (26) are slidably arranged in the second air channel (15), and the second piston column (26) corresponds to the locking hole of the latch (34).

6. The positioning fixture for CNC machining of high-precision parts according to claim 5, characterized in that: The clamping plate (3) is placed on the top of the bottom plate (1), and the rear side of the outer wall of the clamping plate (3) is evenly provided with special-shaped placement grooves, the special-shaped placement grooves correspond to the clamping block (31), and the latch (34) is inserted into the socket (16).

7. The positioning fixture for CNC machining of high-precision parts according to claim 6, characterized in that: A first groove is formed on the front side of the hollow tube (2), and a second groove is formed evenly on the top of the bottom plate (1). A first annular groove is formed on the inner side wall of the first groove, and a second annular groove is formed on the inner side wall of the second groove. A first sealing ring (4) is arranged in the first groove, and a second sealing ring (41) is arranged in the second groove. The first sealing ring (4) is located on the outer ring of the first piston column (23), and the second sealing ring (41) is located on the outer ring of the latch (34). A second retaining ring (42) is arranged on the outer side wall of the first sealing ring (4), and a third retaining ring (43) is arranged on the outer side wall of the second sealing ring (41). The second retaining ring (42) is clamped in the first annular groove, and the third retaining ring (43) is clamped in the second annular groove.

8. The positioning fixture for CNC machining of high-precision parts according to claim 7, characterized in that: A group of mounting grooves are provided on both upper and lower sides of the inner side wall of the locking hole of the latch pin (34), a third spring (36) is arranged in the mounting groove, a round head latch pin (37) is provided on the outer side wall of the third spring (36), and a group of positioning holes are provided on both upper and lower sides of the second piston column (26), and the round head part of the round head latch pin (37) corresponds to the positioning hole.

9. The positioning fixture for CNC machining of high-precision parts according to claim 1, characterized in that: The inner wall of the bolt hole (13) is provided with a third annular groove, a sealing plug (133) is inserted into the bolt hole (13), the outer wall of the sealing plug (133) is provided with a first retaining ring (132), the first retaining ring (132) is clamped in the third annular groove, and a pull strip (131) is provided on the top of the sealing plug (133).

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