Quick positioning structure for high-precision CNC (computer numerical control) machining center fixture

Abstract

The utility model discloses a high-precision CNC machining center clamp rapid positioning structure which comprises a machining table, a threaded column is vertically fixed to the center of the top face of the machining table, a rotary table is arranged on the top face of the threaded column, the top face of the rotary table is in radial sliding connection with four clamping blocks annularly distributed at equal intervals, and the top face of the rotary table is fixedly connected with four supporting plates corresponding to the clamping blocks. First through holes horizontally penetrate through the side faces of the supporting plates respectively, first guide rods are axially connected in the first through holes in a sliding and penetrating mode respectively, clamping blocks are fixed to one ends of the first guide rods respectively, limiting blocks are fixed to the other ends of the first guide rods respectively, and a first locking piece is arranged on the outer side of each supporting plate. The four clamping blocks are movably connected to the rotary table through the springs, the guide grooves and the guide blocks, so that the four clamping blocks move at the same time, a workpiece is clamped and fixed in four directions, the workpiece is detected in the center of the rotary table, meanwhile, the clamping firmness of the clamping blocks to the workpiece is optimized, and the detection accuracy is improved. And the first locking piece is used for fixing the moving position of the clamping block.

Description

Technical Field

[0001] The utility model relates to the technical field of CNC machining, in particular to a high-precision CNC machining center fixture rapid positioning structure. Background Art

[0002] CNC machining generally refers to computer digital controlled precision machining, CNC machining lathes, CNC machining milling machines, CNC machining boring and milling machines, etc.; it is programmed and controlled by CNC machining language, usually G code; CNC machining G code language tells the CNC machine tool what kind of Cartesian position coordinates to use for the machining tool, and controls the tool feed speed and spindle speed, as well as tool changers, coolants and other functions;

[0003] However, in CNC machining, the workpiece needs to be positioned and then tool aligned before machining can be performed. The existing workpiece positioning structure is too simple, and only clamps and limits the workpiece on both sides. The clamping stability is low and it is not easy to position at the center. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a high-precision CNC machining center fixture rapid positioning structure.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a high-precision CNC machining center fixture rapid positioning structure, including a machining table, a threaded column vertically fixed at the center of the top surface of the machining table, the top surface of the threaded column is rotatably connected to a turntable, the outside of the threaded column is movably connected to a second locking piece abutting against the turntable, the top surface of the turntable is radially slidably connected to four equidistant annularly distributed clamping blocks, the top surface of the turntable is fixedly connected to four support plates corresponding to the clamping blocks, each of the side surfaces of the support plates is horizontally penetrated by a first through hole, each of the first through holes is axially slidably penetrated by a first guide rod, one end of each of the first guide rods is fixed with a clamping block, and the other end is fixed with a limit block, and a first locking piece is provided on the outer side of each of the support plates.

[0006] As a further description of the above technical solution: the second locking member includes a first internally threaded ring threadedly sleeved on the outside of the threaded column, a first friction ring is concentrically fixed on the top surface of the first internally threaded ring, the top surface of the first friction ring abuts against the second friction ring, the second friction ring is fixedly sleeved on the outer edge of the turntable, and the first friction ring and the second friction ring are both made of hard rubber.

[0007] As a further description of the above technical solution: four equidistant guide grooves are radially opened on the top surface of the turntable, a guide block is slidably connected to each of the guide grooves, a clamping block is fixed to the top surface of each guide block, the side surface of the guide groove horizontally passes through a second through hole, a second guide rod is axially slidably inserted into each of the second through holes, the second guide rod is horizontally fixed in the guide groove, the outer edge of the second guide rod is sleeved with a spring, the spring abuts between the guide groove and the guide block, and an arc surface is opened on the opposite side of each clamping block.

[0008] As a further description of the above technical solution: a sliding groove is opened on the bottom surface of each guide groove, a sliding block is slidably connected in each sliding groove, the sliding block is fixed on the bottom surface of the guide block, an annular dovetail groove is concentrically opened on the top surface of the threaded column, a dovetail ring is rotatably connected in the annular dovetail groove, and the dovetail ring is concentrically fixed on the bottom surface of the turntable.

[0009] As a further description of the above technical solution: the first locking member includes an externally threaded tube horizontally fixed on the outside of the support plate, the externally threaded tube is concentric with the first through hole, and the first guide rod is axially slidably inserted into the externally threaded tube, the end of the externally threaded tube is fixedly connected to a plurality of equidistant annularly distributed elastic sheets, each of the elastic sheets expands outwardly to the outside of the externally threaded tube, and a fan-shaped sheet is fixed to the outside of the end of each elastic sheet, and the external thread of the externally threaded tube is sleeved with a second internally threaded ring.

[0010] As a further description of the above technical solution: the thickness of the elastic sheet is greater than the thickness of the external threaded tube, and the inner side of each elastic sheet is fixedly connected to a soft rubber sheet.

[0011] The utility model has the following beneficial effects:

[0012] 1. Compared with the prior art, the high-precision CNC machining center fixture rapid positioning structure is provided with four clamping blocks on the top surface of the turntable, and the four clamping blocks are movably connected to the turntable through springs, guide grooves and guide blocks, so that the four clamping blocks can move at the same time, clamp and fix the workpiece from four directions, so that the workpiece can be detected at the center of the turntable, and the firmness of the clamping blocks on the workpiece is also optimized. The first locking member is used to fix the moving position of the clamping blocks to prevent the clamping blocks from being offset during the processing of the workpiece;

[0013] 2. Compared with the prior art, the high-precision CNC machining center fixture rapid positioning structure adjusts the processing angle of the workpiece by rotatably connecting the turntable to the top surface of the threaded column using a dovetail ring and an annular dovetail groove. When processing the workpiece, there is no need to loosen the clamping block and then adjust the angle of the workpiece, thereby reducing the time spent on secondary clamping of the workpiece. The second locking member is used to fix the rotation angle of the turntable outside the threaded column. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a three-dimensional diagram of the overall structure of the high-precision CNC machining center fixture rapid positioning structure proposed by the utility model;

[0015] Figure 2 This is the overall structural sectional view of the high-precision CNC machining center fixture rapid positioning structure proposed by the utility model;

[0016] Figure 3 The utility model proposes a high-precision CNC machining center fixture rapid positioning structure Figure 2 A magnified view of the structure at center A;

[0017] Figure 4 The utility model proposes a high-precision CNC machining center fixture rapid positioning structure Figure 2 A magnified view of the structure at B in the middle;

[0018] Figure 5 This is a three-dimensional diagram of the connection between the externally threaded tube and the elastic sheet of the high-precision CNC machining center fixture rapid positioning structure proposed by the utility model.

[0019] Legend:

[0020] 1. Processing table; 2. First internal threaded ring; 3. First friction ring; 4. Second friction ring; 5. Turntable; 6. Support plate; 7. First guide rod; 8. Arc surface; 9. First through hole; 10. Spring; 11. Guide groove; 12. Limit block; 13. Clamp block; 14. Threaded column; 15. Externally threaded pipe; 16. Second internal threaded ring; 17. Fan-shaped sheet; 18. Elastic sheet; 19. Guide block; 20. Second through hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Reference Figures 1 to 5 The utility model provides a high-precision CNC machining center fixture rapid positioning structure: comprising a machining table 1, a threaded column 14 is vertically fixed at the center of the top surface of the machining table 1, the top surface of the threaded column 14 is rotatably connected to a turntable 5, the outside of the threaded column 14 is movably connected to a second locking member abutting against the turntable 5, the top surface of the turntable 5 is radially slidably connected to four equidistant annular clamping blocks 13, the top surface of the turntable 5 is radially provided with four equidistant guide grooves 11, each guide groove 11 is slidably connected to a guide block 19, the bottom surface of each guide groove 11 is provided with a slide groove, each slide groove is slidably connected to a slider, the slider is fixed to the bottom surface of the guide block 19, and a clamping block 13 is fixed to the top surface of each guide block 19. The side surface of the guide groove 11 horizontally penetrates the second through hole 20, and each second through hole 20 is axially slidably connected with a second guide rod, and the second guide rod is horizontally fixed in the guide groove 11. The outer edge of the second guide rod is sleeved with the spring 10, and the spring 10 abuts between the guide groove 11 and the guide block 19. The opposite surface of each clamping block 13 is provided with an arc surface 8. The top surface of the turntable 5 is fixedly connected with four support plates 6 corresponding to the clamping blocks 13. The side surface of each support plate 6 horizontally penetrates a first through hole 9, and each first through hole 9 is axially slidably connected with a first guide rod 7. One end of each first guide rod 7 is fixed with a clamping block 13, and the other end is fixed with a limit block 12. A first locking member is provided on the outer side of each support plate 6;

[0023] Reference Figures 1 to 3 as well as Figure 5 In order to fix the radial movement of the clamping block 13, the first locking member includes an external threaded tube 15 horizontally fixed to the outside of the support plate 6, the external threaded tube 15 is concentric with the first through hole 9, and the first guide rod 7 is axially slidably connected to the external threaded tube 15, and the end of the external threaded tube 15 is fixedly connected to a plurality of equidistant annularly distributed elastic sheets 18, each elastic sheet 18 expands outward to the outside of the external threaded tube 15, and a fan-shaped sheet 17 is fixed to the outside of the end of each elastic sheet 18, and the external thread of the external threaded tube 15 is sleeved with a second internal threaded ring 16, the thickness of the elastic sheet 18 is greater than the thickness of the external threaded tube 15, and the inner side of each elastic sheet 18 is fixedly connected to a soft rubber sheet;

[0024] By arranging four clamping blocks 13 on the top surface of the turntable 5, and movably connecting the four clamping blocks 13 to the turntable 5 through the spring 10, the guide groove 11 and the guide block 19, the four clamping blocks 13 can move simultaneously, clamp and fix the workpiece from four directions, so that the workpiece can be detected at the center of the turntable 5, and the firmness of the clamping blocks 13 clamping the workpiece is also optimized. The first locking member is used to fix the moving position of the clamping block 13 to prevent the clamping block 13 from being offset when the workpiece is being processed;

[0025] Reference Figures 1 to 5In order to adjust and fix the processing angle of the workpiece, the second locking member includes a first internal threaded ring 2 threadedly sleeved on the outside of the threaded column 14, a first friction ring 3 is concentrically fixed on the top surface of the first internal threaded ring 2, the top surface of the first friction ring 3 abuts against the second friction ring 4, the second friction ring 4 is fixedly sleeved on the outer edge of the turntable 5, the first friction ring 3 and the second friction ring 4 are both made of hard rubber, an annular dovetail groove is concentrically provided on the top surface of the threaded column 14, a dovetail ring is rotatably connected in the annular dovetail groove, and the dovetail ring is concentrically fixed on the bottom surface of the turntable 5;

[0026] By rotatably connecting the turntable 5 to the top surface of the threaded column 14 using a dovetail ring and an annular dovetail groove, the processing angle of the workpiece is adjusted, so that when the workpiece is processed, there is no need to loosen the clamping block 13 and then adjust the angle of the workpiece, thereby reducing the time spent on secondary clamping of the workpiece. The second locking member is used to fix the rotation angle of the turntable 5 outside the threaded column 14.

[0027] Working principle: first, place the workpiece to be processed between the four clamping blocks 13, and the four clamping blocks 13 are displaced in the opposite direction at the same time. At the same time, the spring 10 is compressed, so that the four clamping blocks 13 can adjust the spacing between the clamping blocks 13 according to the size of the workpiece. At the same time, when the spring 10 is compressed, under its elastic force, the spring 10 applies a reverse thrust to the clamping block 13, so that the four clamping blocks 13 are displaced in a relatively small amplitude from four directions at the same time. The four clamping blocks 13 are always in contact with the outside of the workpiece. The first guide rod 7 will perform axial displacement in the first through hole 9 and the external threaded tube 15 on the support plate 6, and push the workpiece to the center of the turntable 5, and then rotate each second internal threaded ring 16 to move the second internal threaded ring 16 toward the direction of the elastic sheet 18, and the second internal threaded ring 16 will squeeze The elastic sheet 18 is pressed against the outside of the first guide rod 7, and the friction between the elastic sheet 18 and the first guide rod 7 is increased by the soft rubber sheet, so that the axial displacement of the first guide rod 7 is limited, so that the position of the clamping block 13 on the turntable 5 can be limited, and then the workpiece can be processed. When it is necessary to adjust the processing angle of the workpiece, it is only necessary to rotate the first internal thread ring 2 to make the first internal thread ring 2 descend, and the first internal thread ring 2 drives the first friction ring 3 to descend, and the first friction ring 3 is separated from the second friction ring 4, and then the processing angle of the workpiece can be adjusted by rotating the turntable 5. After the adjustment is completed, the first internal thread ring 2 is rotated in the opposite direction, so that the first internal thread ring 2 drives the first friction ring 3 to rise and abut against the second friction ring 4, and the angle of the workpiece on the turntable 5 is fixed by friction.

[0028] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision CNC machining center fixture rapid positioning structure, comprising a machining table (1), wherein a threaded column (14) is vertically fixed at the center of the top surface of the machining table (1), characterized in that: The top surface of the threaded column (14) is rotatably connected to the turntable (5), the outside of the threaded column (14) is movably connected to a second locking member abutting against the turntable (5), the top surface of the turntable (5) is radially slidably connected to four equidistant annularly distributed clamping blocks (13), the top surface of the turntable (5) is fixedly connected to four support plates (6) corresponding to the clamping blocks (13), each side surface of the support plate (6) is horizontally penetrated by a first through hole (9), each first through hole (9) is axially slidably penetrated by a first guide rod (7), one end of each first guide rod (7) is fixed with a clamping block (13), and the other end is fixed with a limit block (12), and a first locking member is provided on the outer side of each support plate (6).

2. The high-precision CNC machining center fixture rapid positioning structure according to claim 1 is characterized by: The second locking member comprises a first internally threaded ring (2) threadedly sleeved on the outside of the threaded column (14); a first friction ring (3) is concentrically fixed to the top surface of the first internally threaded ring (2); the top surface of the first friction ring (3) abuts against the second friction ring (4); the second friction ring (4) is fixedly sleeved on the outer edge of the turntable (5); and the first friction ring (3) and the second friction ring (4) are both made of hard rubber.

3. The high-precision CNC machining center fixture rapid positioning structure according to claim 1 is characterized by: The top surface of the turntable (5) is radially provided with four equally spaced guide grooves (11), each of which is slidably connected to a guide block (19), and a clamping block (13) is fixed to the top surface of each of which. The side surface of the guide groove (11) horizontally passes through a second through hole (20), and each of which is axially slidably connected to a second guide rod, which is horizontally fixed in the guide groove (11). The outer edge of the second guide rod is sleeved with a spring (10), and the spring (10) is abutted between the guide groove (11) and the guide block (19). An arc surface (8) is provided on the opposite side of each of which.

4. The high-precision CNC machining center fixture rapid positioning structure according to claim 3 is characterized in that: A slide groove is provided on the bottom surface of each guide groove (11), a slider is slidably connected in each slide groove, the slider is fixed on the bottom surface of the guide block (19), an annular dovetail groove is concentrically provided on the top surface of the threaded column (14), a dovetail ring is rotatably connected in the annular dovetail groove, and the dovetail ring is concentrically fixed on the bottom surface of the turntable (5).

5. The high-precision CNC machining center fixture rapid positioning structure according to claim 1, characterized in that: The first locking member comprises an externally threaded tube (15) horizontally fixed on the outside of the support plate (6), the externally threaded tube (15) being concentric with the first through hole (9), and the first guide rod (7) being axially slidably inserted into the externally threaded tube (15), the end of the externally threaded tube (15) being fixedly connected to a plurality of equidistantly annularly distributed elastic sheets (18), each of the elastic sheets (18) expanding outwardly to the outside of the externally threaded tube (15), and a sector sheet (17) being fixedly connected to the outside of the end of each elastic sheet (18), and the external thread of the externally threaded tube (15) being sleeved with a second internally threaded ring (16).

6. The high-precision CNC machining center fixture rapid positioning structure according to claim 5, characterized in that: The thickness of the elastic sheet (18) is greater than the thickness of the externally threaded tube (15), and the inner side of each elastic sheet (18) is fixedly connected to a soft rubber sheet.

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