CN211490549U

CN211490549U - Metal part machining center based on precise machining

Info

Publication number: CN211490549U
Application number: CN201922479157.8U
Authority: CN
Inventors: 詹淳崵; 赵长亮; 蒋燕; 周士升
Original assignee: Suzhou Fengchuan Electronic Technology Co ltd
Current assignee: Suzhou Fengchuan Electronic Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-09-15
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a metalwork machining center based on accurate processing, including stand, base, workstation, cutter and aircraft nose, the stand is located base one side, the workstation is installed on the base, aircraft nose movably installs on the stand and is located the workstation top, the cutter is installed on the aircraft nose, a clamping tool is installed to the workstation, the clamping tool further includes base plate, support plate and apron, be provided with a baffle between apron and the work piece, the upper surface of baffle is connected with the lower surface contact of apron, the support plate upper surface just is located the work piece and is provided with a plurality of annular groove under, and it has the air channel of a plurality of crisscross link up to open in every annular groove, and it has a plurality of gas pocket to open in this air channel, and this gas pocket passes through pipeline and vacuum generator through connection. The utility model discloses a vacuum adsorption's mode adsorbs fixedly to the work piece, and the accurate location of realization to the work piece and stable centre gripping are realized to pressure head mechanism again.

Description

Metal part machining center based on precise machining

Technical Field

The utility model relates to a metalwork machining center based on accurate processing belongs to the machining field.

Background

A Computer Numerical Control (CNC) machine is an automatic machine equipped with a program control system, which can logically process a program specified by a control code or other symbolic instructions and decode the program so as to make the machine operate and machine parts, so that compared with the traditional manufacturing industry, the CNC machine has higher machining precision and automation degree, saves a large number of manual operation links, improves the productivity, and is widely applied to the modernization process of the manufacturing industry. The tool clamp is a component for assisting production and processing, which is very common in the industrial manufacturing industry, and is used for fixing a workpiece to be processed so as to facilitate the transportation of the workpiece or a related processing technology; particularly, when CNC machining is performed, a workpiece to be machined is often required to be clamped and fixed by a tool clamp.

The rapid development of communication technology accelerates the updating and upgrading speed of electronic products and also promotes the continuous innovation of the production chain of electronic products. For the shell of an electronic product, particularly a metal shell, because the shell is thin in thickness and irregular in shape, an operator is difficult to fix a workpiece in the production process, the workpiece is very easy to deform and damage under the action of external force of a machine tool, the machining error is large, clamping needs to be carried out at least twice, clamping deformation, cutter vibration lines and cutter receiving marks can be generated by multiple times of clamping machining, the defective rate of the product is high, the production efficiency is low, and the huge market demand for the electronic product is difficult to meet. Therefore, the CNC clamp technology becomes an important factor for limiting the processing efficiency of metal parts of electronic products.

Disclosure of Invention

The utility model aims at providing a metalwork machining center based on accurate processing, this metalwork machining center based on accurate processing adopts vacuum adsorption's mode to adsorb fixedly to the work piece, and clamp plate and pressure head mechanism are relegated again, realize the accurate location and the stable centre gripping of work piece.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a metal part machining center based on precise machining comprises an upright post, a base, a workbench, a cutter and a machine head, wherein the upright post is positioned on one side of the base, the workbench is installed on the base, the machine head is movably installed on the upright post and positioned above the workbench, the cutter is installed on the machine head, the workbench is provided with a clamping jig, and a workpiece to be machined is installed on the clamping jig;

the clamping jig further 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, the cover plate is arranged above the workpiece, the lower surface of the cover plate is in press fit connection with the workpiece, a plurality of pressure head mechanisms are arranged at the peripheral edge of the base plate and are in press fit connection with the top surface of the cover plate;

the pressure head mechanism further comprises a fixed plate, a fixed seat, a push-pull rod, a warping pressure plate, a pressure head and two connecting rotating plates symmetrically arranged on two sides of the fixed seat, one end of the fixed plate is arranged on the base plate, the other end, far away from the base plate, of the fixed plate is provided 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 plates, and the lower end of the push-pull rod passes through the fixed plate and is connected with a driving assembly;

the base part at the lower end of the fixed seat is fixedly arranged on the upper surface of the fixed plate, the base part is connected with a connecting part inclined towards one side of the push-pull rod, the lower end of the connecting part is provided with a first rotating shaft penetrating through the connecting part, the upper end of the connecting part is provided with a second rotating shaft penetrating through the connecting part, two ends of the first rotating shaft respectively extend out of two sides of the connecting part and are respectively connected with the connecting rotating plate, and the second rotating shaft is rotatably connected with the tail end of the warping pressing plate;

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

one end, opposite to the corner portion, of each of the two first strip-shaped portions is rotatably connected with the upper end of the push-pull rod through a third rotating shaft, a fourth rotating shaft is connected between one ends, opposite to the corner portion, of the two second strip-shaped portions, the fourth rotating shaft is rotatably connected with the rear end of the pressing head, the rear end of the pressing head is provided with a downwards extending switching portion, the switching portion is rotatably connected with the middle rear portion of the warping pressing plate through a fifth rotating shaft, and the lower surface of the front end of the pressing head can be in compression contact with the upper surface of the warping pressing plate;

the upper end of the push-pull rod is connected with a fixed block, the fixed block is provided with a strip-shaped through hole, the third rotating shaft is embedded into the strip-shaped through hole, two ends of the third rotating shaft respectively extend out of the strip-shaped through hole, and the first strip-shaped parts of the two connecting rotating plates are respectively in rotating connection with two ends of the third rotating shaft;

the workpiece comprises a body, wherein two opposite edges of the body are provided with an upward first bending part, the middle part of the other edge of the body is provided with a notch part, and the edges at two ends of the groove are respectively provided with an upward second bending part;

a partition plate is arranged between the cover plate and the workpiece, the lower surface of the partition plate is in contact connection with the upper surface of the body, and the upper surface of the partition plate is higher than the top surface of the first bending part and is in contact connection with the lower surface of the cover plate;

the vacuum sealing device is characterized in that a plurality of annular grooves are formed in the upper surface of the carrier plate and located under a workpiece, a plurality of staggered and communicated vent grooves are formed in each annular groove, a plurality of air holes are formed in each vent groove, each air hole is communicated with a vacuum generator through a pipeline, and a sealing ring is embedded in each annular groove.

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

1. in the above aspect, the air holes are provided at intersections of the vent grooves.

2. In the above scheme, two opposite edges of the carrier plate are respectively provided with a long strip-shaped annular groove.

3. In the above scheme, the workbench is movably mounted on the base and can reciprocate in two directions perpendicular to each other.

4. In the above scheme, two limiting blocks corresponding to the second bending portion are fixed on the carrier plate, and one side surface of each limiting block is in contact connection with the outer side surface of the second bending portion;

5. in the above scheme, the upper surface of the substrate and one side of the carrier plate are provided with at least two limiting columns, and the cover plate is provided with through holes for embedding the limiting columns.

6. In the above scheme, spacing card is all installed at the both ends of first pivot, third pivot and fourth pivot, and this spacing card imbeds in the recess at first pivot, third pivot or fourth pivot both ends, and the inboard surface of this spacing card is connected with the outside surface contact who connects the rotor plate.

7. In the above scheme, the upper end of the connecting part of the fixing seat is provided with a groove for embedding the rear end of the tilting pressing plate, and the rear end of the tilting pressing plate is embedded into the groove on the connecting part and is rotatably connected with the fixing seat through the second rotating shaft.

8. In the above scheme, the switching portion at the rear end of the pressure head is two symmetrically arranged switching plates, and the tilting pressure plate is embedded between the two switching plates and is rotatably connected with the two switching plates through the fifth rotating shaft.

Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage:

1. the utility model discloses because the metalwork machining center of accurate processing, its pressure head mechanism structural design is ingenious, through the linkage effect of a plurality of parts, makes the perk clamp plate provide dual pressure with the pressure head, has not only strengthened the dynamics and the stability that the perk clamp plate was held to the apron pressure, avoids processing to the work piece, because of the clamping dynamics is not enough takes place the condition such as shake, shake sword, production knife line, improves the stability and the quality of work piece processing; the clamping force of the warping pressing plate can be increased under the condition that the driving force provided by the driving assembly is the same, and further, when the length of the warping pressing plate is long, second stress is provided in the middle of the warping pressing plate through the pressing head, so that the warping pressing plate can clamp a cover plate at a far distance with stable and constant pressure, more space is provided for processing a workpiece, multiple processes can be performed on the workpiece at one time, and the processing effect and efficiency of the workpiece are improved; in addition, through the cooperation setting of push rod pole and each structure for the biggest angle that the perk clamp plate can be opened is greater than 90, is convenient for to the clamping of work piece, and can not injure by the article of centre gripping, has further improved stability and the quality to work piece processing.

2. The utility model discloses because the metalwork machining center of accurate processing is provided with a baffle between its apron and the work piece, and the lower surface of this baffle is connected with the upper surface contact of body, the upper surface of baffle is higher than the top surface of first bending portion and is connected with the lower surface contact of apron, through the setting of baffle, avoids the apron that hardness is higher to directly contact with the work piece, has both avoided the apron to the wearing and tearing of work piece, can make pressure head mechanism exert the power on the apron balanced exert on the work piece again, avoids local strength too big and damage the work piece when guaranteeing to work piece centre gripping dynamics stable; in addition, be fixed with two stoppers that correspond with the second portion of bending on its support plate, a side surface of this stopper is connected with the outside surface contact of the second portion of bending, and the base plate upper surface just is located support plate one side and is provided with two at least spacing posts, be provided with the through-hole that supplies spacing post embedding on the apron, the setting of stopper is tentatively decided to the work piece, is convenient for to the accurate positioning of work piece, and the setting of spacing post is then for the apron provides spacingly for the apron can be quick accurate installation.

3. The utility model discloses metalwork machining center based on accurate processing, its support plate upper surface just is located the work piece and is provided with a plurality of annular groove under, it has a plurality of crisscross air channel that link up to open in every annular groove, it has a plurality of gas pocket to open in this air channel, this gas pocket passes through pipeline and vacuum generator through connection, it is fixed to adopt vacuum adsorption's mode to adsorb the work piece, be convenient for tentatively decide for the location of work piece and support plate closely laminate, the clamp plate and pressure head mechanism of deuterogamying, the realization is to the accurate location of work piece and stabilize the centre gripping.

Drawings

Fig. 1 is a schematic structural view of a metal part machining center based on precision machining according to the present invention;

FIG. 2 is a schematic view of a workpiece to be machined;

fig. 3 is a schematic structural view of a clamping jig of a metal piece machining center based on precision machining according to the present invention;

fig. 4 is a structural front view of a pressing head mechanism of a metal part machining center based on precision machining of the utility model;

fig. 5 is a first structural schematic diagram of a pressure head mechanism of a metal part machining center based on precision machining according to the present invention;

fig. 6 is a structural schematic diagram of a pressure head mechanism of the metal part machining center based on precision machining according to the present invention;

FIG. 7 is an enlarged view of a portion of the structure of FIG. 6;

FIG. 8 is a schematic diagram of a connecting rotary plate structure of a head pressing mechanism of a metal part processing center of the present invention;

FIG. 9 is a schematic view of a fixing seat structure of a head pressing mechanism of a metal piece processing center according to the present invention;

fig. 10 is a schematic view of a support plate structure of the clamping jig of the metal piece machining center of the present invention;

figure 11 is the utility model discloses metalwork machining center's clamping tool local structure sketch map.

In the above drawings: 1. a substrate; 2. a carrier plate; 3. a workpiece; 301. a body; 302. a first bending portion; 303. a notch portion; 304. a second bending portion; 4. a partition plate; 5. a cover plate; 6. a pressure head mechanism; 601. a fixing plate; 602. a fixed seat; 6021. a base part; 6022. a connecting portion; 603. a push-pull rod; 604. warping and pressing the plate; 605. a pressure head; 6051. a switching part; 606. a through hole; 607. a drive assembly; 608. a first rotating shaft; 609. a second rotating shaft; 610. a third rotating shaft; 611. a fourth rotating shaft; 612. a fifth rotating shaft; 613. a fixed block; 6131. a strip-shaped through hole; 614. connecting the rotating plate; 6141. a first bar-shaped portion; 6142. a second bar-shaped portion; 6143. a corner portion; 10. an annular groove; 11. a vent channel; 12. air holes; 16. a limiting block; 17. a limiting column; 21. a column; 22. a base; 23. a work table; 24. a cutter; 25. a machine head; 26. and (5) clamping a jig.

Detailed Description

In the description of this patent, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.

Example 1: a metal part machining center based on precise machining comprises an upright post 21, a base 22, a workbench 23, a cutter 24 and a machine head 25, wherein the upright post 21 is positioned on one side of the base 22, the workbench 23 is installed on the base 22, the machine head 25 is movably installed on the upright post 21 and positioned above the workbench 23, the cutter 24 is installed on the machine head 25, a clamping jig 26 is installed on the workbench 23, and a workpiece 3 to be machined is installed on the clamping jig 26;

the clamping jig 26 further 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, 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 at 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 fixed plate 601, a fixed 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 fixed seat 602, wherein one end of the fixed plate 601 is mounted 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 fixed plate 601, the upper end of the push-pull rod 603 is rotatably connected with the connecting rotating plates 614, and the lower end of the push-pull rod 603 passes through the fixed 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 the push-pull rod 603 is connected to 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 portion 6141 and a second strip-shaped portion 6142, wherein one end of each of the first strip-shaped portion 6141 and the second strip-shaped portion 6142 is connected, so that an acute angle is formed between the first strip-shaped portion 6141 and the second strip-shaped portion 6142, a corner portion 6143 is formed at the connecting position of the first strip-shaped portion 6141 and the second strip-shaped portion 6142, and the corner portions 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 portion 6143, of each of the two first bar-shaped portions 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 portion 6143, of the two second bar-shaped portions 6142, the fourth rotating shaft 611 is rotatably connected with the rear end of the pressure head 605, the rear end of the pressure head 605 is provided with a switching portion 6051 extending downwards, the switching portion 6051 is rotatably connected with the middle rear portion of the seesaw plate 604 through a fifth rotating shaft 612, and the lower surface of the front end of the pressure head 605 can be in pressing contact with the upper surface of the seesaw plate 604;

the upper end of the push-pull rod 603 is connected with a fixing block 613, the fixing block 613 is provided with a strip-shaped through hole 6131, 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 the first strip-shaped parts 6141 of the two connecting rotating plates 614 are respectively connected with two ends of the third rotating shaft 610 in a rotating manner;

the workpiece 3 comprises a body 301, two opposite edges of the body 301 are provided with a first bending part 302 which is upward, the middle part of the other edge of the body 301 is provided with a notch part 303, and the edges of two ends of the notch part 303 are respectively provided with a second bending part 304 which is upward;

a partition plate 4 is arranged between the cover plate 5 and the workpiece 3, the lower surface of the partition plate 4 is in contact connection with the upper surface of the body 301, and the upper surface of the partition plate 4 is higher than the top surface of the first bending part 302 and is in contact connection with the lower surface of the cover plate 5;

the upper surface of the carrier plate 2 is provided with a plurality of annular grooves 10 under the workpiece 3, a plurality of staggered through ventilation grooves 11 are formed in each annular groove 10, a plurality of air holes 12 are formed in each ventilation groove 11, the air holes 12 are communicated with a vacuum generator through a pipeline, and sealing rings are embedded in the annular grooves 10.

The air holes 12 are arranged at the intersection of the vent grooves 11; two opposite edges of the carrier plate 2 are respectively provided with a strip-shaped annular groove 10; the worktable 23 is movably mounted on the base 22 and can reciprocate in two directions perpendicular to each other;

the two ends of the first rotating shaft 608, the third rotating shaft 610 and the fourth rotating shaft 611 are respectively provided with a limiting clamping piece 615, the limiting clamping pieces 615 are embedded into the grooves at the two ends of the first rotating shaft 608, the third rotating shaft 610 or the fourth rotating shaft 611, and the inner side surface of the limiting clamping pieces 615 is in contact connection with the outer side surface of the connecting rotating plate 614;

the driving unit 607 is an air cylinder installed on the lower surface of the fixing plate 601; the carrier plate 2 is an epoxy resin plate; the number of the pressure head mechanisms 6 is 8, and two pressure head mechanisms are respectively arranged at the four edges of the substrate 1; the partition board 4 is a glass fiber partition board.

Example 2: a metal part machining center based on precise machining comprises an upright post 21, a base 22, a workbench 23, a cutter 24 and a machine head 25, wherein the upright post 21 is positioned on one side of the base 22, the workbench 23 is installed on the base 22, the machine head 25 is movably installed on the upright post 21 and positioned above the workbench 23, the cutter 24 is installed on the machine head 25, a clamping jig 26 is installed on the workbench 23, and a workpiece 3 to be machined is installed on the clamping jig 26;

Two limiting blocks 16 corresponding to the second bending portions 304 are fixed on the carrier plate 2, and one side surfaces of the limiting blocks 16 are in contact connection with the outer side surfaces of the second bending portions 304; at least two limiting posts 17 are arranged on the upper surface of the substrate 1 and on one side of the carrier plate 2, and through holes for the limiting posts 17 to be embedded are arranged on the cover plate 5;

the upper end of the connecting part 6022 of the fixed seat 602 is provided with a groove for the rear end of the seesaw pressing plate 604 to be embedded into, the rear end of the seesaw pressing plate 604 is embedded into the groove on the connecting part 6022 and is rotatably connected with the fixed seat 602 through the second rotating shaft 609; the adaptor part 6051 at the rear end of the pressing head 605 is two symmetrically arranged adaptor plates, and the warping pressing plate 604 is embedded between the two adaptor plates and is rotatably connected with the two adaptor plates through the fifth rotating shaft 612;

the carrier plate 2 is a glass fiber plate; the partition plate 4 is made of polyurethane, two side surfaces of the partition plate 4 are respectively in contact connection with the inner side surfaces of the two first bending portions 302, and a plurality of avoiding grooves are respectively formed on the two side surfaces of the partition plate 4, and the avoiding grooves are arranged corresponding to the processing positions of the workpieces 3.

When the metal part machining center based on accurate machining is adopted, the pressure head mechanism is ingenious in structural design, double pressure is provided by the warping pressure plate and the pressure head through the linkage effect of a plurality of components, the force and stability of the warping pressure plate for pressing and holding the cover plate are enhanced, the conditions of shaking, tool vibration, tool lines and the like caused by insufficient clamping force during machining of a workpiece are avoided, and the stability and the quality of workpiece machining are improved; the clamping force of the warping pressing plate can be increased under the condition that the driving force provided by the driving assembly is the same, and further, when the length of the warping pressing plate is long, second stress is provided in the middle of the warping pressing plate through the pressing head, so that the warping pressing plate can clamp a cover plate at a far distance with stable and constant pressure, more space is provided for processing a workpiece, multiple processes can be performed on the workpiece at one time, and the processing effect and efficiency of the workpiece are improved; in addition, the maximum angle at which the warping pressing plate can be opened is larger than 90 degrees due to the matching arrangement of the push rod and each structure, so that the clamping of the workpiece is facilitated, clamped articles cannot be damaged, and the stability and the quality of the workpiece processing are further improved;

through the arrangement of the partition plate, the cover plate with higher hardness is prevented from directly contacting with the workpiece, so that the abrasion of the cover plate on the workpiece is avoided, the force exerted on the cover plate by the pressure head mechanism can be uniformly exerted on the workpiece, and the workpiece is prevented from being damaged due to overlarge local force while the stability of the clamping force on the workpiece is ensured; in addition, the limiting blocks are arranged to preliminarily fix the workpiece, so that the workpiece is conveniently and accurately positioned, and the limiting columns are arranged to limit the cover plate, so that the cover plate can be quickly and accurately installed; in addition, the workpiece is adsorbed and fixed in a vacuum adsorption mode, the workpiece is conveniently preliminarily fixed to be positioned, the workpiece is tightly attached to the support plate, and the pressing plate and the pressing head mechanism are matched to realize accurate positioning and stable clamping of the workpiece.

During the use, promote the push-and-pull rod through drive assembly and shift up, through the conveying of power for the perk clamp plate moves down and pushes down the apron, and drive assembly continues to drive the push-and-pull rod and shifts up after that, through the further conveying of power, makes the pressure head front end compress tightly the perk clamp plate downwards, provides the second stress for the perk clamp plate, has further strengthened the size and the stability of perk clamp plate to the apron pressure.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides a metalwork machining center based on accurate processing which characterized in that: the machining device comprises an upright post (21), a base (22), a workbench (23), a cutter (24) and a machine head (25), wherein the upright post (21) is positioned on one side of the base (22), the workbench (23) is installed on the base (22), the machine head (25) is movably installed on the upright post (21) and positioned above the workbench (23), the cutter (24) is installed on the machine head (25), the workbench (23) is provided with a clamping jig (26), and a workpiece (3) to be machined is installed on the clamping jig (26);

the clamping jig (26) further comprises a base plate (1), a carrier plate (2) and a cover plate (5), wherein the carrier plate (2) is fixedly arranged on the upper surface of the base plate (1), the upper surface of the carrier plate (2) is in contact connection with the lower surface of a workpiece (3), 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 workpiece (3) comprises a body (301), wherein two opposite edges of the body (301) are provided with a first upward bending part (302), the middle part of the other edge of the body (301) is provided with a notch part (303), and the edges of two ends of the notch part (303) are respectively provided with a second upward bending part (304);

a partition plate (4) is arranged between the cover plate (5) and the workpiece (3), the lower surface of the partition plate (4) is in contact connection with the upper surface of the body (301), and the upper surface of the partition plate (4) is higher than the top surface of the first bending part (302) and is in contact connection with the lower surface of the cover plate (5);

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 precision machining-based metal part machining center according to claim 1, wherein: the air holes (12) are arranged at the intersection of the vent grooves (11).

3. The precision machining-based metal part machining center according to claim 1, wherein: two opposite edges of the carrier plate (2) are respectively provided with a long strip-shaped annular groove (10).

4. The precision machining-based metal part machining center according to claim 1, wherein: the working table (23) is movably arranged on the base (22) and can reciprocate in two directions which are perpendicular to each other.

5. The precision machining-based metal part machining center according to claim 1, wherein: two limiting blocks (16) corresponding to the second bending parts (304) are fixed on the carrier plate (2), and one side surface of each limiting block (16) is in contact connection with the outer side surface of each second bending part (304).

6. The precision machining-based metal part machining center according to claim 5, wherein: the upper surface of the base plate (1) and one side of the carrier plate (2) are provided with at least two limiting columns (17), and the cover plate (5) is provided with through holes for embedding the limiting columns (17).

7. The precision machining-based metal part machining center according to claim 1, wherein: the limiting clamping pieces (615) are mounted at two ends of the first rotating shaft (608), the third rotating shaft (610) and the fourth rotating shaft (611), the limiting clamping pieces (615) are embedded into grooves at two ends of the first rotating shaft (608), the third rotating shaft (610) or the fourth rotating shaft (611), and the inner side surfaces of the limiting clamping pieces (615) are in contact connection with the outer side surfaces of the connecting rotating plates (614).

8. The precision machining-based metal part machining center according to claim 1, wherein: the upper end of the connecting part (6022) of the fixed seat (602) is provided with a groove for embedding the rear end of the tilting pressure plate (604), and the rear end of the tilting pressure plate (604) is embedded into the groove on the connecting part (6022) and is rotatably connected with the fixed seat (602) through the second rotating shaft (609).

9. The precision machining-based metal part machining center according to claim 1, wherein: the adapter plate that the switching portion (6051) of pressure head (605) rear end set up for two symmetries, stick up between this two adapter plates clamp plate (604) embedding, and through fifth pivot (612) and two adapter plates rotate to be connected.