CN211490609U - CNC is anchor clamps for finish machining - Google Patents

Abstract

The invention discloses a CNC finish machining fixture which comprises a base plate, a support plate and a cover plate, wherein the support plate is fixedly arranged on the upper surface of the base plate, the upper surface of the support plate is in contact connection with the lower surface of a workpiece to be machined, the cover plate is arranged above the workpiece, the lower surface of the cover plate is in press connection with the workpiece, a plurality of pressure head mechanisms are arranged at the peripheral edge of the base plate and in press connection with the top surface of the cover plate, a plurality of annular grooves are formed in the upper surface of the support plate and under the workpiece, a plurality of ventilation grooves which are communicated in a staggered mode are formed in each annular groove, a plurality of air holes are formed in each ventilation groove, the air holes are communicated with a vacuum generator through pipelines, and sealing rings are embedded in. The workpiece is adsorbed and fixed in a vacuum adsorption mode, initial positioning of the workpiece is facilitated, the workpiece is tightly attached to the support plate, and accurate positioning and stable clamping of the workpiece are achieved by matching the pressing plate and the pressing head mechanism.

Description

Fixtures for CNC finishing

technical field

The invention relates to a fixture for CNC finishing, belonging to the field of machining.

Background technique

Computerized Numerical Control (hereinafter referred to as CNC) is an automatic machine tool equipped with a program control system. The control system can logically process the programs specified by control codes or other symbolic instructions, and decode them, so as to make the machine tool move and process. Therefore, compared with the traditional manufacturing industry, CNC machining accuracy and degree of automation are higher, saving a lot of manual operations, improving productivity, and being widely used in the modernization process of manufacturing.

The rapid development of communication technology has accelerated the speed of the replacement of electronic products, and also promoted the continuous innovation of the production chain of electronic products. For the shell of electronic products, especially the metal shell, due to its thin thickness and irregular shape, it is difficult for operators to fix the workpiece during the production process. The workpiece is easily deformed and damaged under the action of the external force of the machine tool, and the processing error is large, resulting in defective products. The production rate is high and the production efficiency is low, making it difficult to meet the huge market demand for electronic products.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a fixture for CNC finishing, which adopts vacuum adsorption to adsorb and fix the workpiece, which is convenient for the preliminary positioning of the workpiece, so that the workpiece and the carrier plate are closely attached, and then the workpiece is fixed. Cooperate with the pressing plate and the pressing head mechanism to achieve precise positioning and stable clamping of the workpiece.

In order to achieve the above purpose, the technical solution adopted in the present invention is: a CNC finishing fixture, comprising a substrate, a carrier plate and a cover plate, the carrier plate is fixedly mounted on the upper surface of the substrate, and the upper surface of the carrier plate is connected to the to-be-processed surface. The lower surface of the workpiece is contacted and connected, the cover plate is arranged above the workpiece, and the lower surface of the cover plate is press-fitted and connected to the workpiece. Several indenter mechanisms are installed on the surrounding edges of the base plate, and the indenter mechanism is connected to the cover plate. The top surface of the press-fit connection;

The indenter mechanism further comprises a fixed plate, a fixed seat, a push-pull rod, a rocking plate, a pressure head and two connecting rotating plates symmetrically arranged on both sides of the fixed seat, one end of the fixed plate is mounted on the base plate, and the fixed plate is far away from the The other end of the base plate is opened with a through hole for the push-pull rod to pass through, the upper end of the push-pull rod is rotatably connected with the connecting rotating plate, and the lower end of the push-pull rod passes through the fixed plate and is connected with a drive assembly;

The base part of the lower end of the fixed seat is fixedly installed on the upper surface of the fixed plate, the base part is connected with a connecting part inclined to one side of the push-pull rod, and the lower end of the connecting part is installed with a first rotating shaft passing through the connecting part , the upper end of the connecting part is installed with a second rotating shaft that penetrates the connecting part, the two ends of the first rotating shaft respectively protrude from both sides of the connecting part, and are respectively connected with the connecting rotating plate, the second rotating shaft and the rocking plate The end of the rotating connection;

The connecting rotating plate includes a first strip part and a second strip part, and one end of the first strip part and the second strip part are connected, so that between the first strip part and the second strip part An acute angle is formed between them, and a corner portion is formed at the junction of the first strip portion and the second strip portion, and the two corner portions connecting the rotating plates are respectively rotatably connected with both ends of the first rotating shaft;

One end of the two first bar-shaped parts facing away from the corner part is rotatably connected to the upper end of the push-pull rod through a third rotating shaft, and a fourth A rotating shaft, the fourth rotating shaft is rotatably connected with the rear end of the pressure head, and the rear end of the pressure head has a downwardly extending adapter part, and the adapter part rotates with the middle and rear part of the rocker through a fifth rotating shaft connected, and the lower surface of the front end of the indenter can be in pressing contact with the upper surface of the warping plate;

The upper end of the push-pull rod is connected with a fixing block, the fixing block is provided with a strip-shaped through hole, the third rotating shaft is embedded in the strip-shaped through-hole, and the two ends of the third rotating shaft respectively protrude from the strip-shaped through-hole , the first strip-shaped portions of the two connecting rotating plates are respectively rotatably connected with both ends of the third rotating shaft;

Several annular grooves are arranged on the upper surface of the carrier plate and located directly below the workpiece, each annular groove is provided with a plurality of staggered through ventilation grooves, and a plurality of air holes are opened in the ventilation grooves, and the air holes pass through the pipeline and the vacuum. The generator is connected through, and a sealing ring is embedded in the annular groove.

The further improved scheme in the above technical scheme is as follows:

1. In the above solution, the air holes are arranged at the intersection of the ventilation grooves.

2. In the above solution, two opposite edges of the carrier plate are respectively provided with an elongated annular groove.

3. In the above solution, the driving component is an air cylinder.

4. In the above solution, the drive assembly is installed on the lower surface of the fixing plate.

5. In the above solution, the number of the indenter mechanisms is 8, and two groups are respectively installed at the four edges of the substrate.

6. In the above scheme, the cover plate is an iron cover plate or a plastic cover plate.

7. In the above solution, a bottom plate is provided directly below the base plate, and the bottom plate and the cover plate are connected by a plurality of support columns.

8. In the above scheme, the bottom plate and the cover plate are connected by 4 supporting columns, and these 4 supporting columns are respectively located at the four corners of the bottom plate.

Due to the application of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

1. The fixture for CNC finishing of the present invention has an ingenious design of the indenter mechanism. Through the linkage action of multiple components, the rocker plate and the indenter can provide double pressure, which not only enhances the strength and stability of the rocker plate to the cover plate. It can avoid jitter, vibration, and knife lines due to insufficient clamping force when the workpiece is processed, so as to improve the stability and quality of workpiece processing. Increase the pressing force of the rocker. Further, when the length of the rocker is long, the second pressure is provided in the middle of the rocker by the indenter, so that the rocker can apply a stable and constant pressure to the remote cover. Clamping, thus providing more space for the processing of the workpiece, the workpiece can be processed in multiple processes at one time, and the processing effect and efficiency of the workpiece can be improved; The maximum angle that can be opened is greater than 90°, which is convenient for clamping the workpiece without bumping the clamped items, further improving the stability and quality of the workpiece processing.

2. The jig for CNC finishing of the present invention is provided with several annular grooves on the upper surface of the carrier plate and directly below the workpiece, and each annular groove is provided with a number of staggered through ventilation grooves, and there are several ventilation grooves in the ventilation groove. The air hole is connected to the vacuum generator through a pipeline, and a sealing ring is embedded in the annular groove to adsorb and fix the workpiece by vacuum adsorption, which is convenient for the preliminary positioning of the workpiece and makes the workpiece and the carrier plate tightly Fit, and then cooperate with the pressure plate and the indenter mechanism to achieve precise positioning and stable clamping of the workpiece.

Description of drawings

Accompanying drawing 1 is the structural representation of the fixture for CNC finishing of the present invention;

Accompanying drawing 2 is the front view of the indenter mechanism structure of the fixture for CNC finishing of the present invention;

Accompanying drawing 3 is the structure schematic diagram 1 of the indenter mechanism of the fixture for CNC finishing of the present invention;

Accompanying drawing 4 is the structural schematic diagram 2 of the indenter mechanism of the fixture for CNC finishing of the present invention;

Accompanying drawing 5 is the partial structure enlarged view of accompanying drawing 4;

6 is a schematic diagram of the structure of the connecting rotating plate of the CNC finishing fixture of the present invention;

Accompanying drawing 7 is the structure schematic diagram of the fixing seat of the fixture for CNC finishing of the present invention;

FIG. 8 is a schematic view of the carrier plate structure of the jig for CNC finishing according to the present invention.

In the above drawings: 1, base plate; 2, carrier plate; 3, workpiece; 5, cover plate; 6, indenter mechanism; 601, fixing plate; 602, fixing seat; 6021, base part; 603, push-pull rod; 604, rocker plate; 605, indenter; 6051, adapter part; 606, through hole; 607, drive assembly; 608, first shaft; 609, second shaft; 610, third shaft; 611 612, the fifth shaft; 613, the fixed block; 6131, the strip through hole; 614, the connecting rotating plate; 6141, the first strip part; 6142, the second strip part; 6143, the corner part; 8. Bottom plate; 9. Support column; 10. Annular groove; 11. Ventilation groove; 12. Air hole.

Detailed ways

In the description of this patent, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention; the terms "first", "second", "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise Clearly stipulated and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or a Electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this patent can be understood in specific situations.

Embodiment 1: a CNC finishing fixture, comprising a substrate 1, a carrier 2 and a cover 5, the carrier 2 is fixedly mounted on the upper surface of the substrate 1, and the upper surface of the carrier 2 is connected to the workpiece 3 to be processed. The lower surface of the base plate is contacted and connected, the cover plate 5 is arranged above the workpiece 3, and the lower surface of the cover plate 5 is press-fitted and connected to the workpiece 3, and a number of indenter mechanisms 6 are installed on the surrounding edges of the base plate 1. The indenter The mechanism 6 is press-fitted and connected with the top surface of the cover plate 5;

The indenter mechanism 6 further includes a fixed plate 601, a fixed base 602, a push-pull rod 603, a rocking plate 604, a pressure head 605 and two connecting rotating plates 614 symmetrically arranged on both sides of the fixed base 602. One end of the fixed plate 601 Installed on the base plate 1, the other end of the fixing plate 601 away from the base plate 1 has a through hole 606 for the push-pull rod 603 to pass through. The lower end passes through the fixing plate 601 and is connected with a driving assembly 607;

The base portion 6021 at the lower end of the fixing seat 602 is fixedly mounted on the upper surface of the fixing plate 601, the base portion 6021 is connected with a connecting portion 6022 inclined to the side of the push-pull rod 603, and a lower end of the connecting portion 6022 is installed with a Passing through the first rotating shaft 608 of the connecting portion 6022, the upper end of the connecting portion 6022 is mounted with a second rotating shaft 609 passing through the connecting portion 6022, the two ends of the first rotating shaft 608 respectively protrude from the two sides of the connecting portion 6022, and respectively Connected to the connecting rotating plate 614, the second rotating shaft 609 is rotatably connected to the end of the rocking plate 604;

The connecting rotating plate 614 includes a first strip portion 6141 and a second strip portion 6142, and one end of the first strip portion 6141 and the second strip portion 6142 are connected, so that the first strip portion 6141 is connected with the first strip portion 6141. An acute angle is formed between the second bar-shaped portions 6142, and a corner portion 6143 is formed at the connection between the first bar-shaped portion 6141 and the second bar-shaped portion 6142. Both ends of the rotating shaft 608 are rotatably connected;

One end of the two first strip portions 6141 facing away from the corner portion 6143 is rotatably connected to the upper end of the push-pull rod 603 through a third rotating shaft 610 , and one end of the two second strip portions 6142 facing away from the corner portion 6143 A fourth rotating shaft 611 is connected therebetween, and the fourth rotating shaft 611 is rotatably connected with the rear end of the indenter 605. The rear end of the indenter 605 has an adapter portion 6051 extending downward, and the adapter portion 6051 passes through A fifth rotating shaft 612 is rotatably connected to the middle and rear of the rocking plate 604, and the lower surface of the front end of the indenter 605 can be in pressing contact with the upper surface of the rocking plate 604;

The upper end of the push-pull rod 603 is connected to a fixing block 613, the fixing block 613 has a strip-shaped through hole 6131, the third rotating shaft 610 is embedded in the strip-shaped through hole 6131, and the two ends of the third rotating shaft 610 are The bar-shaped through holes 6131 protrude, and the first bar-shaped portions 6141 of the two connecting rotating plates 614 are respectively rotatably connected to both ends of the third rotating shaft 610;

A plurality of annular grooves 10 are provided on the upper surface of the carrier plate 2 and located directly below the workpiece 3. Each annular groove 10 is provided with a plurality of staggered through ventilation grooves 11, and a plurality of air holes 12 are opened in the ventilation grooves 11. , the air hole 12 is connected with the vacuum generator through a pipeline, and a sealing ring is embedded in the annular groove 10 .

The air holes 12 are arranged at the intersection of the ventilation grooves 11; the two opposite edges of the carrier plate 2 are respectively provided with a long annular groove 10; the driving component 607 is a cylinder; the driving component 607 is installed on the fixing plate On the lower surface of 601; the above-mentioned cover plate 5 is an iron cover plate;

The upper end of the connecting portion 6022 of the fixing base 602 is provided with a groove for the rear end of the rocking plate 604 to be embedded in. The rear end of the rocking plate 604 is embedded in the groove on the connecting portion 6022, and rotates with the fixing base 602 through the second rotating shaft 609. connect;

The adapter portion 6051 at the rear end of the indenter 605 is two symmetrically arranged adapter plates, the rocking plate 604 is embedded between the two adapter plates, and is rotatably connected to the two adapter plates through the fifth rotating shaft 612 .

Example 2: A CNC finishing fixture, comprising a substrate 1, a carrier 2 and a cover 5, the carrier 2 is fixedly mounted on the upper surface of the substrate 1, and the upper surface of the carrier 2 is connected to the workpiece 3 to be processed. The lower surface of the base plate is contacted and connected, the cover plate 5 is arranged above the workpiece 3, and the lower surface of the cover plate 5 is press-fitted and connected to the workpiece 3, and a number of indenter mechanisms 6 are installed on the surrounding edges of the base plate 1. The indenter The mechanism 6 is press-fitted and connected with the top surface of the cover plate 5;

The indenter mechanism 6 further includes a fixed plate 601, a fixed base 602, a push-pull rod 603, a rocking plate 604, a pressure head 605 and two connecting rotating plates 614 symmetrically arranged on both sides of the fixed base 602. One end of the fixed plate 601 Installed on the base plate 1, the other end of the fixing plate 601 away from the base plate 1 has a through hole 606 for the push-pull rod 603 to pass through. The lower end passes through the fixing plate 601 and is connected with a driving assembly 607;

The base portion 6021 at the lower end of the fixing seat 602 is fixedly mounted on the upper surface of the fixing plate 601, the base portion 6021 is connected with a connecting portion 6022 inclined to the side of the push-pull rod 603, and a lower end of the connecting portion 6022 is installed with a Passing through the first rotating shaft 608 of the connecting portion 6022, the upper end of the connecting portion 6022 is mounted with a second rotating shaft 609 passing through the connecting portion 6022, and the two ends of the first rotating shaft 608 respectively protrude from the two sides of the connecting portion 6022, and respectively Connected to the connecting rotating plate 614, the second rotating shaft 609 is rotatably connected to the end of the rocking plate 604;

The connecting rotating plate 614 includes a first strip portion 6141 and a second strip portion 6142, and one end of the first strip portion 6141 and the second strip portion 6142 are connected, so that the first strip portion 6141 is connected with the first strip portion 6141. An acute angle is formed between the second bar-shaped portions 6142, and a corner portion 6143 is formed at the connection between the first bar-shaped portion 6141 and the second bar-shaped portion 6142. Both ends of the rotating shaft 608 are rotatably connected;

One end of the two first strip portions 6141 facing away from the corner portion 6143 is rotatably connected to the upper end of the push-pull rod 603 through a third rotating shaft 610 , and one end of the two second strip portions 6142 facing away from the corner portion 6143 A fourth rotating shaft 611 is connected therebetween, and the fourth rotating shaft 611 is rotatably connected with the rear end of the indenter 605. The rear end of the indenter 605 has an adapter portion 6051 extending downward, and the adapter portion 6051 passes through A fifth rotating shaft 612 is rotatably connected to the middle and rear of the rocking plate 604, and the lower surface of the front end of the indenter 605 can be in pressing contact with the upper surface of the rocking plate 604;

The upper end of the push-pull rod 603 is connected to a fixing block 613, the fixing block 613 has a strip-shaped through hole 6131, the third rotating shaft 610 is embedded in the strip-shaped through hole 6131, and the two ends of the third rotating shaft 610 are The bar-shaped through holes 6131 protrude, and the first bar-shaped portions 6141 of the two connecting rotating plates 614 are respectively rotatably connected to both ends of the third rotating shaft 610;

A plurality of annular grooves 10 are provided on the upper surface of the carrier plate 2 and located directly below the workpiece 3. Each annular groove 10 is provided with a plurality of staggered through ventilation grooves 11, and a plurality of air holes 12 are opened in the ventilation grooves 11. , the air hole 12 is connected with the vacuum generator through a pipeline, and a sealing ring is embedded in the annular groove 10 .

The number of the above-mentioned pressing head mechanisms 6 is 8, and two groups are respectively installed at the four edges of the base plate 1; the above-mentioned cover plate 5 is a plastic cover plate; The cover plates 5 are connected by four support columns 9, and the four support columns 9 are located at the four corners of the bottom plate 8 respectively;

Limit cards 615 are installed at both ends of the first rotating shaft 608 , the third rotating shaft 610 and the fourth rotating shaft 611 , and the limiting cards 615 are embedded in the grooves at both ends of the first rotating shaft 608 , the third rotating shaft 610 or the fourth rotating shaft 611 , and the inner surface of the limiting card 615 is in contact with the outer surface of the connecting rotating plate 614 .

When the above-mentioned CNC finishing fixture is used, its structural design is ingenious. Through the linkage action of multiple components, the rocker plate and the indenter can provide double pressure, which not only enhances the strength and stability of the rocker plate on the cover plate, but also avoids the need for When the workpiece is processed, jitter, vibration of the tool, generation of knife lines, etc. occur due to insufficient clamping force, which improves the stability and quality of workpiece processing; it is also possible to increase the warping plate when the driving force provided by the driving component is the same. Further, when the length of the rocker plate is long, the second heavy pressure is provided in the middle of the rocker plate by the indenter, so that the rocker plate can perform stable and constant pressure clamping on the remote cover plate, thereby Provide more space for the processing of the workpiece, and can process the workpiece in multiple processes at one time, so as to improve the processing effect and efficiency of the workpiece; The angle is greater than 90°, which is convenient for clamping the workpiece without bumping the clamped items, which further improves the stability and quality of the workpiece processing;

In addition, the vacuum adsorption method is used to adsorb and fix the workpiece, which is convenient for the preliminary positioning of the workpiece, so that the workpiece and the carrier plate are closely attached, and then cooperate with the pressure plate and the indenter mechanism to achieve precise positioning and stable clamping of the workpiece.

When in use, the push-pull rod is pushed up by the drive assembly, and through the transmission of force, the rocker plate moves downward to press the cover plate, and then the drive assembly continues to drive the push-pull rod to move up, and then through the further transmission of force, the front end of the indenter moves toward the front end of the push-pull rod. Press down the rocker plate to provide the second heaviest pressure for the rocker plate, which further enhances the size and stability of the pressure of the rocker plate on the cover plate.

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those who are familiar with the art to understand the content of the present invention and implement them accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.

Claims (9)

1. The utility model provides a CNC is anchor clamps for finish machining which characterized in that: the processing device comprises a base plate (1), a support plate (2) and a cover plate (5), wherein the support plate (2) is fixedly arranged on the upper surface of the base plate (1), the upper surface of the support plate (2) is in contact connection with the lower surface of a workpiece (3) to be processed, the cover plate (5) is arranged above the workpiece (3), the workpiece (3) on the lower surface of the cover plate (5) is in press fit connection, a plurality of pressure head mechanisms (6) are arranged on the peripheral edges of the base plate (1), and the pressure head mechanisms (6) are in press fit connection with the top surface of the cover plate (5);

the pressure head mechanism (6) further comprises a fixing plate (601), a fixing seat (602), a push-pull rod (603), a warping pressing plate (604), a pressure head (605) and two connecting rotating plates (614) symmetrically arranged on two sides of the fixing seat (602), one end of the fixing plate (601) is installed on the substrate (1), a through hole (606) for the push-pull rod (603) to pass through is formed in the other end, away from the substrate (1), of the fixing plate (601), the upper end of the push-pull rod (603) is rotatably connected with the connecting rotating plate (614), and the lower end of the push-pull rod (603) passes through the fixing plate (601) and is connected with a driving assembly (607);

a base part (6021) at the lower end of the fixed seat (602) is fixedly arranged on the upper surface of the fixed plate (601), a connecting part (6022) inclined towards one side of the push-pull rod (603) is connected on the base part (6021), a first rotating shaft (608) penetrating through the connecting part (6022) is arranged at the lower end of the connecting part (6022), a second rotating shaft (609) penetrating through the connecting part (6022) is arranged at the upper end of the connecting part (6022), two ends of the first rotating shaft (608) respectively extend out from two sides of the connecting part (6022) and are respectively connected with the connecting rotating plate (614), and the second rotating shaft (609) is rotatably connected with the tail end of the tilting plate (604);

the connecting rotating plate (614) comprises a first strip-shaped part (6141) and a second strip-shaped part (6142), one end of each of the first strip-shaped part (6141) and the second strip-shaped part (6142) is connected, so that an acute angle is formed between the first strip-shaped part (6141) and the second strip-shaped part (6142), a corner part (6143) is formed at the connection position of the first strip-shaped part (6141) and the second strip-shaped part (6142), and the corner parts (6143) of the two connecting rotating plates (614) are respectively in rotating connection with two ends of the first rotating shaft (608);

one end, opposite to the corner part (6143), of each of the two first strip-shaped parts (6141) is rotatably connected with the upper end of the push-pull rod (603) through a third rotating shaft (610), a fourth rotating shaft (611) is connected between one ends, opposite to the corner part (6143), of the two second strip-shaped parts (6142), the fourth rotating shaft (611) is rotatably connected with the rear end of the pressing head (605), the rear end of the pressing head (605) is provided with a switching part (6051) extending downwards, the switching part (6051) is rotatably connected with the middle rear part of the tilting plate (604) through a fifth rotating shaft (612), and the lower surface of the front end of the pressing head (605) can be in pressing contact with the upper surface of the tilting plate (604);

the upper end of the push-pull rod (603) is connected with a fixed block (613), a strip-shaped through hole (6131) is formed in the fixed block (613), the third rotating shaft (610) is embedded into the strip-shaped through hole (6131), two ends of the third rotating shaft (610) respectively extend out of the strip-shaped through hole (6131), and first strip-shaped parts (6141) of the two connecting rotating plates (614) are respectively in rotating connection with two ends of the third rotating shaft (610);

the vacuum sealing device is characterized in that a plurality of annular grooves (10) are formed in the upper surface of the support plate (2) and located under the workpiece (3), a plurality of staggered and communicated vent grooves (11) are formed in each annular groove (10), a plurality of air holes (12) are formed in each vent groove (11), each air hole (12) is communicated with a vacuum generator through a pipeline, and a sealing ring is embedded into each annular groove (10).

2. The CNC finishing fixture according to claim 1, characterized in that: the air holes (12) are arranged at the intersection of the vent grooves (11).

3. The CNC finishing fixture according to claim 1, characterized in that: two opposite edges of the carrier plate (2) are respectively provided with a long strip-shaped annular groove (10).

4. The CNC finishing fixture according to claim 1, characterized in that: the driving component (607) is a cylinder.

5. The CNC finishing fixture according to claim 1, characterized in that: the driving assembly (607) is arranged on the lower surface of the fixing plate (601).

6. The CNC finishing fixture according to claim 1, characterized in that: the number of the pressure head mechanisms (6) is 8, and two pressure head mechanisms are respectively arranged at the four edges of the base plate (1).

7. The CNC finishing fixture according to claim 1, characterized in that: the cover plate (5) is an iron cover plate or a plastic cover plate.

8. The CNC finishing fixture according to claim 1, characterized in that: a bottom plate (8) is arranged right below the base plate (1), and the bottom plate (8) is connected with the cover plate (5) through a plurality of supporting columns (9).

9. The CNC finishing fixture according to claim 8, wherein: the bottom plate (8) is connected with the cover plate (5) through 4 support columns (9), and the 4 support columns (9) are respectively positioned at four corners of the bottom plate (8).

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