A worktable positioning and clamping mechanism for a tilting plate horizontal machining center

Abstract

The application belongs to the technical field of numerical control machine tools, and particularly discloses a workbench positioning and clamping mechanism for a turnover plate horizontal machining center, wherein a cavity is arranged in a table top support body, a lower V-shaped positioning block is arranged on the top surface of a lower cross beam of the cavity and a V-shaped groove faces upward, an upper V-shaped positioning block is fixed on the bottom surface of the workbench and a V-shaped table thereof is in abutment with a V-shaped groove positioning surface, a base body positioning block of a clamping unit is arranged on the bottom surface and the two side surfaces of the cavity in pairs with a linear clamping module, the base body positioning block is fixed at the rear end of the cavity and is provided with a positioning surface I, the linear clamping module is fixed at the front end of the cavity and is connected with a movable clamping rod, an inclined surface I is arranged on the top of the clamping rod, clamping positioning blocks corresponding to the base body positioning block are fixed on the top surface and the two side surfaces of the workbench, the clamping positioning blocks are provided with a positioning surface II in abutment with the positioning surface I of the base body positioning block, and the other side of the clamping positioning blocks is provided with an inclined surface II in abutment with the inclined surface I. The application has the characteristics of convenient operation, high positioning precision, reliable clamping and good interchangeability.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool technology, specifically to a worktable positioning and clamping mechanism for a flip-type horizontal machining center that is easy to operate, has high positioning accuracy, reliable clamping, and good interchangeability. Background Technology

[0002] With the development of industries such as aerospace, marine engineering, wind power, and automobiles, large structural components are becoming increasingly common, often characterized by thin walls, deep cavities, small corners, and extremely low metal utilization. Traditionally, these large structural components are machined using gantry vertical machine tools, where the component is placed horizontally. While this method is convenient for clamping, the large amount of high-temperature chips generated during machining is difficult to remove promptly, easily causing secondary thermal deformation and secondary cutting of the workpiece, and easily forming built-up edge, affecting the final machining quality and shortening tool life. To overcome the shortcomings of vertical machine tools, horizontal machine tools are now also used to machine large structural components. Because the component is placed vertically, the chips generated during machining can be smoothly removed under gravity. However, clamping is more difficult, increasing the preparation time for cutting and reducing positioning accuracy and clamping reliability, resulting in lower machining efficiency and quality. Especially for structural components that need to be machined on both the front and back sides, loading and unloading the workpiece only occurs after machining has stopped, making simultaneous machining and loading / unloading impossible. This double clamping further reduces machining efficiency and accuracy.

[0003] A horizontal machining center with a flip table is a type of CNC machine tool widely used in metal processing. Its key feature is a rectangular planar worktable that can move along the X, Y, and Z axes during machining. Horizontal machining centers with flip tables typically feature large flip-tables, enabling workpiece clamping in a horizontal position and machining in a vertical position, thus combining the advantages of convenient clamping of vertical machine tools and easy chip removal of horizontal machine tools. However, existing horizontal machining centers often use locating pins for table positioning and hydraulic cylinder clamping. The locating pins are arranged perpendicularly to the locating surfaces, and the locating mechanism is separate from the vertical clamping mechanism. This design is prone to gaps between the locating surfaces due to distance errors in the locating pins, resulting in incomplete positioning and unstable clamping. Ultimately, this not only leads to insufficient clamping reliability and potential safety hazards but also makes it difficult to guarantee precise positioning during multi-table exchanges, hindering the effective improvement of workpiece machining quality. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a worktable positioning and clamping mechanism for a flip-type horizontal machining center that is easy to operate, has high positioning accuracy, reliable clamping, and good interchangeability.

[0005] The present invention is implemented as follows: it includes a tabletop support and a worktable, wherein the tabletop support is vertically arranged and has a square cavity in the middle, and the worktable has a square structure and is detachably fixed in the cavity; its characteristic is that it also includes a positioning unit and a clamping unit.

[0006] The positioning unit includes a lower V-shaped positioning block and an upper V-shaped positioning block. At least two lower V-shaped positioning blocks are spaced apart on the top surface of the lower crossbeam of the cavity, with the opening of the V-shaped groove facing upward. Upper V-shaped positioning blocks that match the lower V-shaped positioning blocks on the top surface of the lower crossbeam of the cavity are fixedly spaced apart on the bottom surface of the worktable. The V-shaped platform of the upper V-shaped positioning block abuts against the positioning surface of the V-shaped groove of the lower V-shaped positioning block.

[0007] The clamping unit includes a base positioning block, a clamping positioning block, and a linear clamping module. The base positioning block and the linear clamping module are arranged in pairs and are at least located on the bottom surface of the upper crossbeam and the inner surfaces of the two side columns of the cavity. The base positioning block is fixedly located at the rear end of the cavity. The base positioning block has a positioning surface I corresponding to the mating surface of the worktable on the side facing the worktable. The linear clamping module is fixedly located at the front end of the cavity and is connected to a clamping rod that can move linearly. The end of the clamping rod away from the linear clamping module extends into the cavity. The top of the clamping rod has an inclined surface I facing the positioning surface I. The worktable has clamping positioning blocks corresponding to the base positioning blocks on the cavity, fixedly at intervals on at least the top surface and the two side surfaces. One side of the clamping positioning block has a positioning surface II that can abut against the positioning surface I of the base positioning block. The other side of the clamping positioning block away from the positioning surface II has an inclined surface II that can abut against the inclined surface I of the clamping rod.

[0008] Furthermore, the working surface of the V-groove of the lower V-shaped positioning block is provided with a number of air blowing holes that are connected to the air supply system at intervals. The contact area between the V-groove and the working surface of the V-shaped table is not less than 60%. A pressure sensor is provided on the pipeline connecting the air blowing hole of the lower V-shaped positioning block to the air supply system. The pressure sensor is electrically connected to the control system of the flip-plate horizontal machining center.

[0009] Furthermore, the positioning surface I of the base positioning block is provided with a plurality of air blowing holes that are connected to the air supply system at intervals. At least two air blowing holes on the bottom surface of the upper crossbeam and / or the top surface of the lower crossbeam of the cavity are respectively provided with pressure sensors on the pipelines connected to the air supply system. The pressure sensors are electrically connected to the control system of the flip-plate horizontal machining center. When the positioning surface I of the base positioning block with the pressure sensor on the air supply pipeline of the air blowing hole abuts against the positioning surface II, the contact area is not less than 60%.

[0010] Furthermore, pressure sensors are respectively installed on the air blowing holes on the bottom surface of the upper crossbeam and the top surface of the lower crossbeam of the cavity, and on the pipelines connecting them to the air supply system.

[0011] Furthermore, the linear clamping module also includes a clamping cylinder, a guide sleeve, and a guide key. The clamping cylinder is fixedly installed in the table support beam near the worktable in the cavity. The clamping rod is fixedly connected to the piston rod of the clamping cylinder. The guide sleeve is fixedly connected to the table support. The clamping rod slides through the guide sleeve. The inner wall of the guide sleeve is provided with a guide groove extending axially. The guide key is detachably fixedly installed on the clamping rod and slides in cooperation with the guide groove of the guide sleeve.

[0012] Furthermore, the linear clamping module also includes a clamping seat and a pressing end cap. The clamping seat is fixedly installed inside the table support beam on the cavity side. The clamping cylinder is fixedly connected to the clamping seat. The guide sleeve is slidably installed in the inner hole of the stepped hole of the clamping cylinder. The pressing end cap is detachably fixed in the outer hole of the stepped hole of the clamping cylinder and abuts against the guide sleeve. The clamping rod passes through the through hole of the pressing end cap. The inner wall of the through hole of the pressing end cap is provided with a guide groove that extends axially and can slide with the guide key.

[0013] Furthermore, the angle between the inclined surface I of the clamping rod and the inclined surface II of the clamping positioning block and the vertical direction is 15-30°, and the inclined surface I of the clamping rod faces the positioning surface I of the base positioning block.

[0014] Furthermore, the present invention also includes a guiding unit, which includes a guide slide plate I and a guide slide plate II. The guide slide plate I is fixedly disposed on the inner side of the two columns on both sides of the cavity and the sliding surface is perpendicular to the working surface of the worktable. The guide slide plate II is fixedly disposed on the two side walls of the worktable and corresponds to the guide slide plate I on the inner side of the two columns on both sides of the cavity. The lateral spacing between the sliding surfaces of the guide slide plate I on the inner side of the two columns on both sides of the cavity is not less than the lateral spacing between the mating surfaces of the guide slide plate II on the two side walls of the worktable.

[0015] Furthermore, the present invention also includes position detection switches respectively disposed on the columns on both sides of the cavity. The position detection switches include a probe mounting base and a probe. The probe mounting base is fixedly disposed on the upper part and / or lower part of the columns on both sides of the cavity. The probe is disposed on the probe mounting base and extends vertically toward the working surface of the worktable. The two sides of the worktable are fixedly disposed with probe limiting plates corresponding to the probe. The probe is electrically connected to the control system of the flip-plate horizontal machining center.

[0016] Furthermore, the position detection switches are respectively located on the upper part of one side column and the lower part of the other side column of the cavity, the probe is located behind the sliding surface of the guide slide plate I, and the probe limiting plate is vertically located at the front end of the guide slide plate II facing the working surface of the worktable with its top surface higher than the sliding mating surface of the guide slide plate II.

[0017] The beneficial effects of this invention are:

[0018] 1. In this invention, at least two lower V-shaped positioning blocks are spaced apart on the top surface of the lower crossbeam of the cavity of the table support, and upper V-shaped positioning blocks that match the lower V-shaped positioning blocks are fixedly installed on the bottom surface of the worktable, thereby forming a positioning unit with double V-shaped positioning surfaces, which effectively ensures the left and right position of the worktable and the torsion of the worktable; moreover, the lower V-shaped positioning blocks installed on the lower crossbeam of the cavity of the table support are single positioning bases. By adjusting the positioning blocks on the bottom surfaces of multiple worktables based on this, the positioning accuracy of a single worktable can be guaranteed, and the consistency of positioning accuracy after multiple worktables are exchanged can also be guaranteed.

[0019] 2. This invention provides a clamping unit driven by a linear clamping module within the cavity of the table support. This not only reserves a degree of freedom for the worktable in the Z direction, ensuring that there is no obstruction to the movement of the worktable in the Z direction within the cavity of the table support during clamping, but also allows the worktable to move slightly in the Z direction due to the clamping force of multiple clamping units within the cavity of the table support. This ensures that the positioning surface is in place, avoiding problems such as false positioning and insecure clamping, thus improving positioning accuracy and clamping reliability.

[0020] 3. The clamping unit of the present invention has a base positioning block and a linear clamping module paired on the crossbeam and the two side columns of the cavity, and a corresponding clamping positioning block is set on the worktable. An inclined surface I is set on the top of the clamping rod of the linear clamping module, and an inclined surface II that can abut against the inclined surface I is set on the clamping positioning block. This can not only form a stable and reliable clamping of the worktable, but also the inclined surface clamping can overcome the axial resistance and the opposing component force between the clamping units during the processing by the component force of the clamping force, further improving the reliability of the clamping.

[0021] 4. The present invention further provides several air blowing holes connected to the air supply system on the V-groove working surface of the lower V-shaped positioning block and the positioning surface I of the base positioning block. This allows compressed air to blow away foreign objects between the contact surfaces during the exchange process on the worktable, ensuring the cleanliness of the contact surfaces and effectively improving the positioning accuracy of clamping. Moreover, by limiting the contact area between the positioning surface and the clamping surface to not less than 60%, and by installing pressure sensors on the pipelines connecting the air blowing holes of the positioning surface and the clamping surface to the air supply system, the contact gap can be determined by detecting the air tightness of the positioning surface and the clamping surface through the gas pressure signal. This ensures that the clamping and positioning of each positioning surface and each clamping surface is accurate for the next operation, improving the reliability of the operation.

[0022] In summary, the present invention features convenient operation, high positioning accuracy, reliable clamping, and good interchangeability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the working structure of the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of point A;

[0025] Figure 3 for Figure 1 Enlarged view of point B;

[0026] Figure 4 for Figure 1 The front view;

[0027] Figure 5 for Figure 4 Enlarged view of the partial cross-section in the CC direction;

[0028] Figure 6 for Figure 4 Enlarged partial cross-sectional view of DD direction;

[0029] Figure 7 for Figure 1 Workbench separation diagram;

[0030] Figure 8 for Figure 7 Enlarged view of point E;

[0031] Figure 9 for Figure 7 Enlarged view at point F;

[0032] Figure 10 This is a schematic diagram of the countertop support and its connectors of the present invention;

[0033] Figure 11 for Figure 10 Enlarged view of point G;

[0034] Figure 12 This is a cross-sectional view of the positioning unit of the present invention;

[0035] In the diagram: 1-Tabletop support, 101-Cavity, 2-Workbench, 3-Lower V-shaped positioning block, 301-V-shaped groove, 4-Upper V-shaped positioning block, 401-V-shaped platform, 5-Base positioning block, 6-Clamping positioning block, 7-Linear clamping module, 8-Clamping rod, 9-Air blowing hole, 11-Clamping cylinder, 12-Guide sleeve, 13-Guide key, 14-Clamping seat, 15-Pressure end cap, 16-Guide slide plate I, 17-Guide slide plate II, 18-Probe mounting base, 19-Probe, 20-Probe limiting plate. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] like Figures 1 to 11 As shown, the present invention includes a tabletop support 1 and a worktable 2. The tabletop support 1 is vertically arranged and has a square cavity 101 in the middle. The worktable 2 has a square structure and is detachably fixed in the cavity 101. The invention is characterized by further including a positioning unit and a clamping unit.

[0038] The positioning unit includes a lower V-shaped positioning block 3 and an upper V-shaped positioning block 4. At least two lower V-shaped positioning blocks 3 are spaced apart on the top surface of the lower crossbeam of the cavity 101, and the opening of the V-shaped groove 301 faces upward. Upper V-shaped positioning blocks 4 are fixedly spaced apart on the bottom surface of the worktable 2 and are paired with the lower V-shaped positioning blocks 3 on the top surface of the lower crossbeam of the cavity 101. The V-shaped platform 401 of the upper V-shaped positioning block 4 abuts against the positioning surface of the V-shaped groove 301 of the lower V-shaped positioning block 3.

[0039] The clamping unit includes a base positioning block 5, a clamping positioning block 6, and a linear clamping module 7. The base positioning block 5 and the linear clamping module 7 are arranged in pairs and are at least located on the bottom surface of the upper crossbeam and the inner surfaces of the two side columns of the cavity 101. The base positioning block 5 is fixedly located at the rear end of the cavity 101. The side of the base positioning block 5 facing the worktable 2 has a positioning surface I corresponding to the mating surface of the worktable. The linear clamping module 7 is fixedly located at the front end of the cavity 101 and is connected to a linearly movable clamping rod 8. The clamping rod 8 extends into the cavity 101 from one end away from the linear clamping module 7. The top of the clamping rod 8 is provided with an inclined surface I facing the positioning surface I. The worktable 2 is fixedly provided with clamping positioning blocks 6 at least on its top surface and two sides, which correspond to the base positioning blocks 5 on the cavity 101. One side of the clamping positioning block 6 is provided with a positioning surface II that can abut against the positioning surface I of the base positioning block 5. The other side of the clamping positioning block 6 away from the positioning surface II is provided with an inclined surface II that can abut against the inclined surface I of the clamping rod 8.

[0040] The working surface of the V-groove 301 of the lower V-shaped positioning block 3 is provided with a number of air blowing holes 9 that are connected to the air supply system at intervals. The contact area between the V-groove 301 and the working surface of the V-shaped table 401 is not less than 60%. A pressure sensor is provided on the pipeline connecting the air blowing hole 9 of the lower V-shaped positioning block 3 and the air supply system. The pressure sensor is electrically connected to the control system of the flip-plate horizontal machining center.

[0041] The positioning surface I of the base positioning block 5 is provided with a plurality of air blowing holes 9 that are connected to the air supply system at intervals. At least two air blowing holes 9 on the base positioning block 5 on the bottom surface of the upper crossbeam and / or the top surface of the lower crossbeam of the cavity 101 are respectively provided with pressure sensors on the pipelines connected to the air supply system. The pressure sensors are electrically connected to the control system of the flip-plate horizontal machining center. When the positioning surface I and positioning surface II of the base positioning block 5 with pressure sensors on the air supply pipeline of the air blowing holes 9 abut, the contact area is not less than 60%.

[0042] Pressure sensors are respectively installed on the air holes 9 on the bottom surface of the upper crossbeam and the top surface of the lower crossbeam of the cavity 101, on the pipelines connecting them to the air supply system.

[0043] The linear clamping module 7 also includes a clamping cylinder 11, a guide sleeve 12, and a guide key 13. The clamping cylinder 11 is fixedly installed in the beam column of the table support 1 near the worktable 2 in the cavity 101. The clamping rod 8 is fixedly connected to the piston rod of the clamping cylinder 11. The guide sleeve 12 is fixedly connected to the table support 1. The clamping rod 8 slides through the guide sleeve 12. The inner wall of the guide sleeve 12 is provided with a guide groove extending axially. The guide key 13 is detachably fixedly installed on the clamping rod 8 and slides in cooperation with the guide groove of the guide sleeve 12.

[0044] The linear clamping module 7 also includes a clamping seat 14 and a pressing end cap 15. The clamping seat 14 is fixedly installed in the beam column of the table support body 1 on the side of the cavity 101. The clamping cylinder 11 is fixedly connected to the clamping seat 14. The guide sleeve 12 is slidably installed in the inner hole of the stepped hole of the clamping cylinder 11. The pressing end cap 15 is detachably fixed in the outer hole of the stepped hole of the clamping cylinder 11 and abuts against the guide sleeve 12. The clamping rod 8 passes through the through hole of the pressing end cap 15. The inner wall of the through hole of the pressing end cap 15 is provided with a guide groove that extends axially and can slide with the guide key 13.

[0045] The inclined surface I of the clamping rod 8 and the inclined surface II of the clamping positioning block 6 are both at an angle of 15 to 30° to the vertical direction, and the inclined surface I of the clamping rod 8 faces the positioning surface I of the base positioning block 5.

[0046] The present invention also includes a guiding unit, which includes a guide slide plate I 16 and a guide slide plate II 17. The guide slide plate I 16 is fixedly disposed on the inner side of the two columns on both sides of the cavity 101 and the sliding surface is flush with the working surface of the worktable 2 (see attached diagram). Figure 4The large surface of the middle worktable 2 is the back of the working surface (the working surface is parallel to the back surface) and perpendicular to it. The guide slide plate II 17 is fixedly installed on both sides of the worktable 2 and corresponds to the guide slide plate I 16 on the inner side of the columns on both sides of the cavity 101. The lateral spacing of the sliding surfaces of the guide slide plate I 16 on the inner side of the columns on both sides of the cavity 101 is not less than the lateral spacing of the mating surfaces of the guide slide plate II 17 on both sides of the worktable 2.

[0047] The present invention also includes position detection switches respectively disposed on the columns on both sides of the cavity 101. The position detection switches include a probe mounting base 18 and a probe 19. The probe mounting base 18 is fixedly disposed on the upper part and / or lower part of the columns on both sides of the cavity 101. The probe 19 is disposed on the probe mounting base 18 and extends vertically toward the working surface of the worktable 2. The two sides of the worktable 2 are fixedly disposed with probe limiting plates 20 corresponding to the probe 19. The probe 19 is electrically connected to the control system of the flip-plate horizontal machining center.

[0048] The position detection switches are respectively located on the upper part of one side column and the lower part of the other side column of cavity 101. The probe 19 is located behind the sliding surface of guide slide plate I 16. The probe limiting plate 20 is vertically located at the front end of guide slide plate II 17 facing the working surface of worktable 2, and its top surface is higher than the sliding mating surface of guide slide plate II 17.

[0049] The upper V-shaped positioning block 4 on the bottom surface of the workbench 2 is processed and installed with the lower V-shaped positioning block 3 on the top surface of the lower crossbeam of the cavity 101 as a reference to achieve pairing.

[0050] Working principle and process of this invention:

[0051] like Figures 1 to 11 As shown, taking the five-axis flip-type horizontal machining center worktable 2 with a positioning and clamping size of 2000×4000mm as an example, the worktable 2 is converted between the machining area and the clamping area of ​​the machining center through the worktable exchange mechanism, which requires high single-machine exchange positioning accuracy and multi-machine exchange consistency.

[0052] During the plate replacement process, the guide unit consisting of two guide slides I16 on each of the inner sides of the left and right columns of cavity 101 and guide slide II17 on worktable 2 provides initial alignment for worktable 2. After worktable 2 is transported to its position, the position detection switches arranged diagonally provide feedback on the position signal. At the same time, during this process, the two positioning units form a double V positioning, and the positioning surfaces of the 12 clamping units distributed on the inner side of cavity 101 are always kept in a clean air supply state to ensure that there are no foreign objects on the contact surfaces (the contact surfaces of the lower V-shaped positioning block 3 and the base positioning block 5 of the clamping unit are provided with multiple φ1.5mm air holes 9. During the exchange of worktables 2, compressed air is used to blow away the foreign objects between the aforementioned contact surfaces to ensure that the contact surfaces are clean). (Clean); After the control system of the flip-type horizontal machining center receives the position detection switch and the pressure sensor (not shown in the figure) positioning signal, the worktable 2 falls vertically and is positioned in both left and right and up and down directions by double V positioning (during the manufacturing process and installation, the lower V-shaped positioning block 3 and the upper V-shaped positioning block 4 are paired and installed at the bottom of different worktables 2 with the lower V-shaped positioning block 3 on the top surface of the lower crossbeam of cavity 101 as the reference, so as to ensure the contact area of ​​the contact surface and the consistency of the thickness direction of the paired V-shaped blocks. During the exchange of worktables 2, the worktable 2 falls on the lower V-shaped positioning block 3 by its own gravity, and the upper V-shaped positioning block 4 moves down and closely abuts the working surface of the lower V-shaped positioning block 3, thereby realizing the up and down positioning of the worktable 2). Simultaneously, an airtightness test is set on the working surface of the lower V-shaped positioning block 3 of the positioning unit (the surface roughness of the contact surface of the lower V-shaped positioning block 3 and the upper V-shaped positioning block 4 is required to be 0.8, and the contact area is guaranteed to be above 75% through grinding. The contact gap of the positioning surface is judged by the gas pressure signal of the pressure sensor during contact). When the detection signal is normal, the clamping cylinders (i.e., clamping cylinders 11) of the 12 clamping units arranged in the four directions of the cavity 101 are controlled to extend, and the inclined surface I of the clamping rod 8 is pressed against the inclined surface II of the clamping positioning block 6. Among the 12 clamping units, the upper... Two sets of clamping units (four sets in total) are arranged below for air tightness testing. After clamping, if the air tightness test signals of the four clamping units are normal (the roughness of the positioning surface I of the base positioning block 5 and the positioning surface II of the tight positioning block 6 is required to be 0.8, and the contact area is guaranteed to be above 75% through grinding, and the contact gap of the positioning surface is judged by the gas pressure signal of the pressure sensor when in contact), it indicates that the clamping and positioning is accurate, and the hook of the exchange mechanism of the worktable 2 can be disengaged, thereby completing the clamping and positioning of the worktable 2 and the workpiece can be processed. After the workpiece is processed, the disassembly of the worktable 2 can be performed in reverse.The inclined plane I of the clamping rod 8 connected to the piston rod of the clamping cylinder is a 20-degree angled plane. The thrust of the piston is decomposed into two components, one perpendicular to the working surface of the worktable 2 and the other parallel to the working surface of the worktable 2. The component perpendicular to the working surface of the worktable 2 is used to clamp the worktable 2 and overcome the axial resistance during the machining process, while the component parallel to the working surface of the worktable 2 is used to overcome the opposing components between the clamping units on the cavity 101.

[0053] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A table positioning and clamping mechanism for a flip-type horizontal machining center, comprising a table support (1) and a worktable (2), wherein the table support (1) is vertically arranged and has a square cavity (101) in the middle, and the worktable (2) is a square structure and is detachably fixed in the cavity (101); characterized in that It also includes a positioning unit and a clamping unit. The positioning unit includes a lower V-shaped positioning block (3) and an upper V-shaped positioning block (4). At least two lower V-shaped positioning blocks (3) are spaced apart on the top surface of the lower crossbeam of the cavity (101) and the opening of the V-shaped groove (301) is upward. Upper V-shaped positioning blocks (4) that are paired with the lower V-shaped positioning blocks (3) on the top surface of the lower crossbeam of the cavity (101) are fixedly spaced apart on the bottom surface of the worktable (2). The V-shaped platform (401) of the upper V-shaped positioning block (4) abuts against the positioning surface of the V-shaped groove (301) of the lower V-shaped positioning block (3). The clamping unit includes a base positioning block (5), a clamping positioning block (6), and a linear clamping module (7). The base positioning block (5) and the linear clamping module (7) are arranged in pairs and are at least located on the bottom surface of the upper crossbeam and the inner side of the two side columns of the cavity (101). The base positioning block (5) is fixedly located at the rear end of the cavity (101). The base positioning block (5) has a positioning surface I corresponding to the mating surface of the worktable (2) on the side facing the worktable (2). The linear clamping module (7) is fixedly located at the front end of the cavity (101) and is connected to a clamping rod (8) that can move linearly. The clamping rod (8) extends into the cavity (101) from one end away from the linear clamping module (7). The top of the clamping rod (8) is provided with an inclined surface I facing the positioning surface I. The worktable (2) is provided with clamping positioning blocks (6) corresponding to the base positioning blocks (5) on the cavity (101) at least on its top surface and both sides. One side of the clamping positioning block (6) is provided with a positioning surface II that can abut against the positioning surface I of the base positioning block (5). The other side of the clamping positioning block (6) away from the positioning surface II is provided with an inclined surface II that can abut against the inclined surface I of the clamping rod (8). The table positioning and clamping mechanism of the flip-type horizontal machining center is characterized in that the working surface of the V-groove (301) of the lower V-shaped positioning block (3) is provided with a plurality of air blowing holes (9) connected to the air supply system at intervals, the contact area between the working surface of the V-groove (301) and the working surface of the V-shaped table (401) is not less than 60%, and a pressure sensor is provided on the pipeline connecting the air blowing hole (9) of the lower V-shaped positioning block (3) to the air supply system, and the pressure sensor is electrically connected to the control system of the flip-type horizontal machining center.

2. The worktable positioning and clamping mechanism for a flip-type horizontal machining center according to claim 1, characterized in that... The positioning surface I of the base positioning block (5) is provided with a number of air blowing holes (9) that are connected to the air supply system. At least two air blowing holes (9) on the bottom surface of the upper crossbeam and the top surface of the lower crossbeam of the cavity (101) are respectively provided with pressure sensors on the pipelines connected to the air supply system. The pressure sensors are electrically connected to the control system of the flip-plate horizontal machining center. The contact area between the positioning surface I and the positioning surface II of the base positioning block (5) with the pressure sensor on the air supply pipeline of the air blowing hole (9) is not less than 60%.

3. The worktable positioning and clamping mechanism for a flip-type horizontal machining center according to claim 2, characterized in that... Pressure sensors are respectively installed on the air holes (9) on the bottom surface of the upper crossbeam and the top surface of the lower crossbeam of the cavity (101) and on the pipelines connected to the air supply system.

4. The worktable positioning and clamping mechanism for a flip-type horizontal machining center according to claim 2, characterized in that... The linear clamping module (7) also includes a clamping cylinder (11), a guide sleeve (12), and a guide key (13). The clamping cylinder (11) is fixedly installed in the beam column of the table support (1) near the worktable (2) in the cavity (101). The clamping rod (8) is fixedly connected to the piston rod of the clamping cylinder (11). The guide sleeve (12) is fixedly connected to the table support (1). The clamping rod (8) slides through the guide sleeve (12). The inner wall of the guide sleeve (12) is provided with a guide groove extending along the axial direction. The guide key (13) is detachably fixedly installed on the clamping rod (8) and slides in cooperation with the guide groove of the guide sleeve (12).

5. The worktable positioning and clamping mechanism for a flip-type horizontal machining center according to claim 4, characterized in that... The linear clamping module (7) also includes a clamping seat (14) and a pressing end cap (15). The clamping seat (14) is fixedly installed in the beam column of the table support (1) on the side of the cavity (101). The clamping cylinder (11) is fixedly connected to the clamping seat (14). The guide sleeve (12) is slidably installed in the inner hole of the stepped hole of the clamping cylinder (11). The pressing end cap (15) is detachably fixed in the outer hole of the stepped hole of the clamping cylinder (11) and abuts against the guide sleeve (12). The clamping rod (8) passes through the through hole of the pressing end cap (15). The inner wall of the through hole of the pressing end cap (15) is provided with a guide groove that extends axially and can slide with the guide key (13).

6. The worktable positioning and clamping mechanism for a flip-type horizontal machining center according to any one of claims 1 to 5, characterized in that... The inclined surface I of the clamping rod (8) faces the positioning surface I of the base positioning block (5).

7. The worktable positioning and clamping mechanism for a flip-type horizontal machining center according to claim 6, characterized in that... It also includes a guide unit, which includes guide slide plate I (16) and guide slide plate II (17). The guide slide plate I (16) is fixedly installed on the inner side of the two columns on both sides of the cavity (101) and the sliding surface is perpendicular to the working surface of the worktable (2). The guide slide plate II (17) is fixedly installed on the two side walls of the worktable (2) and corresponds to the guide slide plate I (16) on the inner side of the two columns on both sides of the cavity (101). The lateral spacing of the sliding surfaces of the guide slide plate I (16) on the inner side of the two columns on both sides of the cavity (101) is not less than the lateral spacing of the mating surfaces of the guide slide plate II (17) on the two side walls of the worktable (2).

8. The worktable positioning and clamping mechanism for a flip-type horizontal machining center according to claim 7, characterized in that... It also includes position detection switches respectively set on the columns on both sides of the cavity (101). The position detection switches include a probe mounting base (18) and a probe (19). The probe mounting base (18) is fixedly set on the upper and / or lower parts of the columns on both sides of the cavity (101). The probe (19) is set on the probe mounting base (18) and extends vertically toward the working surface of the worktable (2). The two sides of the worktable (2) are fixedly set with probe limiting plates (20) corresponding to the probe (19). The probe (19) is electrically connected to the control system of the flip-plate horizontal machining center.

9. The worktable positioning and clamping mechanism for a flip-type horizontal machining center according to claim 8, characterized in that... The position detection switches are respectively set on the upper part of one side column and the lower part of the other side column of the cavity (101). The probe (19) is set behind the sliding surface of the guide slide plate I (16). The probe limiting plate (20) is vertically set at the front end of the guide slide plate II (17) facing the working surface of the worktable (2) and its top surface is higher than the sliding mating surface of the guide slide plate II (17).

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