A dynamic precision detection device for a numerical control machine tool

Abstract

The application discloses a kind of dynamic precision detection devices of numerical control machine tool, including machine tool spindle end, machine tool spindle end is provided with detection tool, still include adjusting mechanism, adjusting mechanism is connected with detection mechanism;Adjusting mechanism includes base, detection mechanism includes frame, base and frame between being provided with telescopic mechanism;Base hinged frame one side bottom, telescopic mechanism one end hinged base, telescopic mechanism other end hinged frame same side top portion;Detection mechanism includes clamping structure, clamping structure is fixedly connected with test cutting piece;Detection mechanism further includes first laser emitter, first laser emitter light connects first laser reflector, and first laser reflector light connects first laser receiving piece.The beneficial effects of the present application can be known according to the description of the above scheme, simple structure, reasonable design, can test the spindle rotation error when the tool of machine tool is located in any ABC swing angle of each position, and the radial runout and axial runout of tool can be detected simultaneously.

Description

Technical Field

[0001] This invention relates to the field of machine tool inspection, and more particularly to a dynamic accuracy testing device for CNC machine tools. Background Technology

[0002] High-end CNC cutting tools are mainly used in high-end manufacturing fields such as aerospace, defense, nuclear industry, and automotive and shipbuilding. These industries are vital to the national economy and involve national defense and security. Domestic cutting tool companies started relatively late and still lag behind those in developed industrialized countries like Europe, America, Japan, and South Korea in terms of technology and processing techniques. Multi-axis CNC machine tools, due to multi-angle rotary positioning and telescopic positioning, dynamic positioning combined with changes in machine body rigidity, will generate a certain spindle rotation error, which will vary at different rotational and telescopic positions. However, current detection systems primarily detect the tool tip position and cannot simultaneously detect the radial runout and axial movement of the tool. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a simple and rationally designed CNC machine tool dynamic accuracy testing device. This device can adjust the spatial direction and position of the test cutting workpiece, thereby testing the spindle rotation error of the machine tool when the tool is located at any ABC swing angle in each position. Furthermore, it can simultaneously detect the radial runout and axial movement of the tool.

[0004] To achieve the above objectives, the present invention provides a dynamic accuracy detection device for CNC machine tools, including a machine tool spindle end, wherein a detection tool is provided at the machine tool spindle end, and an adjustment mechanism is included, wherein the adjustment mechanism is connected to a detection mechanism.

[0005] The adjustment mechanism includes a base, the detection mechanism includes a frame, the base is hinged to the frame, and a telescopic mechanism is provided between the base and the frame;

[0006] The base is hinged to the bottom of one side of the frame, one end of the telescopic mechanism is hinged to the base, and the other end of the telescopic mechanism is hinged to the top of the same side of the frame.

[0007] The testing mechanism includes a clamping structure, and the clamping structure is fixedly connected to the test cutting part;

[0008] The detection mechanism further includes a first laser emitter, which is optically connected to a first laser reflector, and the first laser reflector is optically connected to a first laser receiver.

[0009] The first laser emitter and the first laser receiver are disposed on the frame, and the first laser reflector is disposed on the shank of the detection tool;

[0010] The first laser reflector is provided with a plurality of mounting surfaces, and each mounting surface is at the same distance from the axis of the detection tool;

[0011] Each mounting surface is provided with a wedge-shaped lens. The side of the wedge-shaped lens closest to the first laser emitter is a semi-reflective and semi-transparent surface, and the side of the wedge-shaped lens furthest from the first laser emitter is a total reflection surface.

[0012] The first laser receiver is signal-connected to a processor, and the first laser receiver sends the received laser position information to the processor.

[0013] Furthermore, the incident light emitted by the first laser emitter enters the wedge-shaped lens at an angle;

[0014] The end of the wedge-shaped lens that forms an acute angle with the incident light has a larger thickness.

[0015] Furthermore, the clamping structure includes a first support plate located at the bottom of the frame;

[0016] An electric push rod is provided on the upper surface of the first support plate, and the other end of the electric push rod is connected to a second support plate. A guide telescopic rod structure is provided between the first support plate and the second support plate.

[0017] The second support plate has a first lead screw mechanism on its upper surface, and the first lead screw mechanism is movably connected to the third support plate;

[0018] The upper surface of the third support plate is provided with a second lead screw mechanism, and the second lead screw mechanism is movably connected to the fourth support plate;

[0019] The second lead screw mechanism is perpendicular to the first lead screw mechanism;

[0020] The fourth support plate is provided with a clamping member, which clamps the test cutting part.

[0021] Furthermore, the test cutting part is a trapezoidal block, and the upper surface of the clamping part is provided with a trapezoidal groove, with the small end of the test cutting part having an interference fit with the trapezoidal groove.

[0022] Furthermore, the adjustment mechanism includes a fifth support plate, which is disposed on the machine tool fixture table. An oil top cylinder is disposed on the upper surface of the fifth support plate, and the upper end of the oil top cylinder is connected to the base. The oil top cylinder is connected to a hydraulic pump and a return oil valve.

[0023] Furthermore, the base is provided with a second laser emitter, which is located near the side of the frame away from the hinge point with the base. The second laser emitter is optically connected to a second laser receiver, which is located on the lower surface of the first support plate.

[0024] The second laser receiver is signal-connected to the processor, and the second laser receiver sends the received laser position information to the processor.

[0025] Furthermore, the base is provided with a horizontal sensing mechanism, which includes a bubble chamber. The bubble chamber includes opposing sidewalls. A bottom plate is connected to the bottom of the sidewalls, and a top plate is connected to the top of the sidewalls. Liquid and bubbles are disposed between the sidewalls, the bottom plate, and the top plate.

[0026] A third laser emitter is provided above the top plate, and a third laser receiver is provided below the bottom plate;

[0027] The light from the third laser emitter is directed downwards into the top plate, and the light is perpendicular to the longitudinal center line of the top plate. Both the top plate and the bottom plate are made of transparent material. When the bubble is not located in the light path, the light passes through the top plate, the liquid and the bottom plate in sequence, and then enters the third laser receiver.

[0028] The third laser emitter is provided at both ends above the top plate, and the third laser receiver is provided at both ends below the bottom plate. When the bubble is located below the center section of the top plate, the light rays are located on both sides of the bubble.

[0029] The third laser receiver is signal-connected to the processor, and the processor is signal-connected to the hydraulic pump and the return valve.

[0030] Furthermore, the frame includes four side walls, and two adjacent side walls are provided with the first laser reflector and the first laser receiver.

[0031] Furthermore, a shielding member is connected between the fourth support plate and the side wall, and the shielding member is made of elastic material.

[0032] Furthermore, the first laser reflector is provided with four, six, or eight mounting surfaces.

[0033] Furthermore, an air spring is provided between the machine tool fixture table and the fifth support plate. The air spring includes a rubber air bladder. The air bladder is equipped with an air inlet valve and a pressure limiting valve. The air inlet valve is connected to a buffer air bladder, and the buffer air bladder is connected to an air pump.

[0034] The airbag is equipped with a pressure sensor, the pressure sensor signal is connected to the processor, and the processor signal is connected to the air pump.

[0035] During operation, the test cutting workpiece is first set to a specified angle. Specifically, the rotation function of the machine tool fixture is used to adjust the direction corresponding to the AB swing angle of the test cutting workpiece, and the telescopic mechanism is used to adjust the direction corresponding to the C swing angle of the test cutting workpiece. When adjusting the direction corresponding to the C swing angle of the test cutting workpiece, the angle is determined by the position of the laser received by the second laser receiver.

[0036] Then, the horizontal position of the test cutting part is adjusted using the first lead screw mechanism and the second lead screw mechanism.

[0037] Then, the vertical height of the test cutting workpiece was adjusted using the hydraulic jack cylinder.

[0038] After the test workpiece is fed into the designated position, the machine tool will also send the test tool to the test workpiece at the set ABC swing angle to start cutting.

[0039] During cutting, the detection tool remains stationary, while the test workpiece moves relative to the detection tool using a first and a second leadscrew mechanism. After one layer is removed from the test workpiece, an electric push rod is manipulated to compensate for the height loss on the machined surface of the test workpiece.

[0040] Thus, during the test, the axial runout of the detection tool can be calculated by measuring the distance between the two laser positions received by the first laser receiver; and the radial oscillation of the detection tool can be calculated by measuring the unidirectional movement of the two laser positions received by the first laser receiver.

[0041] Using an air spring with a pressure relief valve for shock absorption has the advantage that the force change on the fifth support plate is very small, so the fifth support plate will not move.

[0042] The beneficial effects of this scheme can be seen from the description of the above scheme. It has a simple structure and reasonable design. Since it can adjust the spatial direction and position of the test cutting workpiece, it can test the spindle rotation error when the machine tool is located at any ABC swing angle in each position. Moreover, it can simultaneously detect the radial runout and axial movement of the tool. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the present invention.

[0044] Figure 2 for Figure 1 Enlarged view of part I.

[0045] Figure 3 This is a schematic diagram showing the rotation of the frame according to the direction corresponding to the C-angle of the present invention.

[0046] Figure 4 for Figure 3 A schematic diagram of the middle frame and its interior in direction A.

[0047] Figure 5 This is a schematic diagram of the horizontal sensing mechanism of the present invention.

[0048] Figure 6 This is a schematic diagram of the horizontal sensing mechanism of the present invention, showing that the bubble does not enter the light path.

[0049] Figure 7 This is a schematic diagram of the structure of the bubble entering the light path in the horizontal sensing mechanism of the present invention.

[0050] In the diagram, 1. Spindle end; 2. Inspection tool; 3. Adjustment mechanism; 4. Inspection mechanism; 5. Base; 6. Frame; 7. Telescopic mechanism; 8. Clamping structure; 9. Test cutting part; 10. First laser emitter; 11. First laser reflector; 12. First laser receiver; 13. Wedge-shaped lens; 14. First support plate; 15. Electric push rod; 16. Second support plate; 17. Guide telescopic rod structure; 18. First lead screw mechanism; 19. Third support plate; 20. Second lead screw mechanism. Structure; 21. Fourth support plate; 22. Clamping component; 23. Fifth support plate; 24. Machine tool fixture table; 25. Hydraulic cylinder; 26. Second laser emitter; 27. Second laser receiver; 28. Horizontal sensing mechanism; 29. ​​Base plate; 30. Top plate; 31. Third laser emitter; 32. Third laser receiver; 33. Liquid; 34. Bubble; 35. Shielding component; 36. Incident light; 37. Reflected light; 38. Light ray; 39. Airbag; 40. Inlet valve; 41. Pressure limiting valve. Detailed Implementation

[0051] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0052] like Figure 1-7 As shown, this embodiment is a dynamic accuracy detection device for CNC machine tools, including a machine tool spindle end 1, a detection tool 2 provided on the machine tool spindle end 1, an adjustment mechanism 3, and a detection mechanism 4 connected to the adjustment mechanism 3;

[0053] The adjustment mechanism 3 includes a base 5, the detection mechanism 4 includes a frame 6, the base 5 is hinged to the frame 6, and a telescopic mechanism 7 is provided between the base 5 and the frame 6.

[0054] The base 5 is hinged to the bottom of one side of the frame 6, and one end of the telescopic mechanism 7 is hinged to the base 5, while the other end of the telescopic mechanism 7 is hinged to the top of the same side of the frame 6.

[0055] The testing mechanism 4 includes a clamping structure 8, and the clamping structure 8 is fixedly connected to the test cutting part 9;

[0056] The testing mechanism 4 also includes a first laser emitter 10, which is optically connected to a first laser reflector 11, and the first laser reflector 11 is optically connected to a first laser receiver 12.

[0057] The first laser emitter 10 and the first laser receiver 12 are disposed on the frame 6, and the first laser reflector 11 is disposed on the tool bar of the detection tool 2;

[0058] The first laser reflector 11 has eight mounting surfaces, and each mounting surface is at the same distance from the axis of the detection tool 2.

[0059] All mounting surfaces are provided with wedge-shaped lenses 13. The side of the wedge-shaped lens 13 closest to the first laser emitter 10 is set as a semi-reflective and semi-transparent surface, and the side of the wedge-shaped lens 13 furthest from the first laser emitter 10 is a total reflection surface.

[0060] The first laser receiver 12 is connected to a processor, and the first laser receiver 12 sends the received laser position information to the processor.

[0061] Furthermore, the incident light 36 emitted by the first laser emitter 10 is obliquely incident on the wedge-shaped lens 13;

[0062] The end of the wedge-shaped lens 13 that forms an acute angle with the incident light 36 has a larger thickness, and the two reflected lights 37 are bifurcated and emitted.

[0063] Furthermore, the clamping structure 8 includes a first support plate 14, which is located at the bottom of the frame 6;

[0064] An electric push rod 15 is provided on the upper surface of the first support plate 14, and the other end of the electric push rod 15 is connected to the second support plate 16. A guide telescopic rod structure 17 is provided between the first support plate 14 and the second support plate 16.

[0065] The upper surface of the second support plate 16 is provided with a first lead screw mechanism 18, and the first lead screw mechanism 18 is movably connected to a third support plate 19.

[0066] The upper surface of the third support plate 19 is provided with a second lead screw mechanism 20, and the second lead screw mechanism 20 is movably connected to a fourth support plate 21.

[0067] The second lead screw mechanism 20 is perpendicular to the first lead screw mechanism 18;

[0068] The fourth support plate 21 is provided with a clamping member 22, which clamps the test cutting part 9.

[0069] Furthermore, the test cutting part 9 is a trapezoidal block, and the upper surface of the clamping part 22 is provided with a trapezoidal groove. The small end of the test cutting part 9 is interference-fitted with the trapezoidal groove.

[0070] Furthermore, the adjustment mechanism 3 includes a fifth support plate 23, which is set on the machine tool fixture table 24. An oil top cylinder 25 is set on the upper surface of the fifth support plate 23. The upper end of the oil top cylinder 25 is connected to the base 5, and the oil top cylinder 25 is connected to a hydraulic pump and a return oil valve.

[0071] Furthermore, the base 5 is provided with a second laser emitter 26, which is located near the side of the frame 6 away from the hinge point with the base 5. The second laser emitter 26 is optically connected to a second laser receiver 27, which is located on the lower surface of the first support plate 14.

[0072] The second laser receiver 27 is connected to the processor, and the second laser receiver 27 sends the received laser position information to the processor.

[0073] Furthermore, the base 5 is provided with a horizontal sensing mechanism 28, which includes a bubble chamber. The bubble chamber includes opposing side walls. The bottom of the side wall is connected to a bottom plate 29, and the top of the side wall is connected to a top plate 30. Liquid 33 and bubbles 34 are disposed between the side wall, the bottom plate 29, and the top plate 30.

[0074] A third laser emitter 31 is installed above the top plate 30, and a third laser receiver 32 is installed below the bottom plate 29;

[0075] The light beam 38 of the third laser emitter 31 is obliquely downward and enters the top plate 30, and the light beam 38 is perpendicular to the longitudinal center line of the top plate 30. The top plate 30 and the bottom plate 29 are both made of transparent material. When the bubble 34 is not located in the path of the light beam 38, the light beam 38 passes through the top plate 30, the liquid 33 and the bottom plate 29 in sequence, and then enters the third laser receiver 32.

[0076] A third laser emitter 31 is provided at both ends above the top plate 30, and a third laser receiver 32 is provided at both ends below the bottom plate 29. When the bubble 34 is located below the center section of the top plate 30, the light beams 38 are located on both sides of the bubble 34.

[0077] The third laser receiver 32 is connected to the processor, and the processor is connected to the hydraulic pump and the return valve.

[0078] Furthermore, the frame 6 includes four side walls, with a first laser reflector 11 and a first laser receiver 12 disposed on two adjacent side walls.

[0079] Furthermore, a shielding member 35 is connected between the fourth support plate 21 and the side wall, and the shielding member 35 is made of elastic material.

[0080] Furthermore, an air spring is provided between the machine tool fixture table 24 and the fifth support plate 23. The air spring includes a rubber air bag 39. The air bag 39 is equipped with an air inlet valve 40 and a pressure limiting valve 41. The air inlet valve 40 is connected to a buffer air bag, and the buffer air bag is connected to an air pump.

[0081] The airbag is equipped with a pressure sensor, the pressure sensor signal is connected to a processor, and the processor signal is connected to an air pump.

[0082] During operation, the test cutting workpiece 9 is first set to a specified angle. Specifically, the rotation function of the machine tool fixture 24 is used to adjust the direction corresponding to the AB swing angle of the test cutting workpiece 9, and the telescopic mechanism 7 is used to adjust the direction corresponding to the C swing angle of the test cutting workpiece 9. When adjusting the direction corresponding to the C swing angle of the test cutting workpiece 9, the angle is determined by the position of the laser received by the second laser receiver 27.

[0083] Then, the horizontal position of the test cutting part 9 is adjusted using the first lead screw mechanism 18 and the second lead screw mechanism 20.

[0084] Then, the vertical height of the test cutting part 9 was adjusted using the hydraulic cylinder 25.

[0085] After the test workpiece 9 is sent to the designated position, the machine tool will also send the test tool 2 to the test workpiece 9 at the set ABC swing angle to start cutting.

[0086] During cutting, the test tool 2 remains stationary, while the test workpiece 9 is moved relative to the test tool 2 using the first lead screw mechanism 18 and the second lead screw mechanism 20. After one layer of the test workpiece 9 is cut away, the electric push rod 15 is operated to compensate for the height loss of the machined surface of the test workpiece 9.

[0087] Thus, during the test, the axial runout of the detection tool 2 can be calculated by the distance between the two laser positions received by the first laser receiver 12; the radial oscillation of the detection tool 2 can be calculated by the same-direction movement of the two laser positions received by the first laser receiver 12.

[0088] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A dynamic accuracy testing device for CNC machine tools, comprising a machine tool spindle end (1), wherein a testing tool (2) is provided on the machine tool spindle end (1), characterized in that, Includes an adjustment mechanism (3), which is connected to a detection mechanism (4); The adjustment mechanism (3) includes a base (5), the detection mechanism (4) includes a frame (6), the base (5) is hinged to the frame (6), and a telescopic mechanism (7) is provided between the base (5) and the frame (6). The base (5) is hinged to the bottom of one side of the frame (6), one end of the telescopic mechanism (7) is hinged to the base (5), and the other end of the telescopic mechanism (7) is hinged to the top of the frame (6) on the same side. The testing mechanism (4) includes a clamping structure (8), and the clamping structure (8) is fixedly connected to the test cutting piece (9). The detection mechanism (4) further includes a first laser emitter (10), which is optically connected to a first laser reflector (11), and the first laser reflector (11) is optically connected to a first laser receiver (12). The first laser emitter (10) and the first laser receiver (12) are disposed on the frame (6), and the first laser reflector (11) is disposed on the shank of the detection tool (2); The first laser reflector (11) is provided with a plurality of mounting surfaces, and each mounting surface is at the same distance from the axis of the detection tool (2); Each mounting surface is provided with a wedge-shaped lens (13). The side of the wedge-shaped lens (13) closest to the first laser emitter (10) is set as a semi-reflective and semi-transparent surface, and the side of the wedge-shaped lens (13) furthest from the first laser emitter (10) is a total reflection surface. The first laser receiver (12) is connected to a processor, and the first laser receiver (12) sends the received laser position information to the processor.

2. The CNC machine tool dynamic accuracy testing device according to claim 1, characterized in that, The incident light (36) emitted by the first laser emitter (10) obliquely enters the wedge-shaped lens (13); The end of the wedge-shaped lens (13) that forms an acute angle with the incident light (36) has a larger thickness.

3. The CNC machine tool dynamic accuracy testing device according to claim 1, characterized in that, The clamping structure (8) includes a first support plate (14) located at the bottom of the frame (6); An electric push rod (15) is provided on the upper surface of the first support plate (14), and the other end of the electric push rod (15) is connected to a second support plate (16). A guide telescopic rod structure (17) is provided between the first support plate (14) and the second support plate (16). The upper surface of the second support plate (16) is provided with a first lead screw mechanism (18), and the first lead screw mechanism (18) is movably connected to a third support plate (19). The upper surface of the third support plate (19) is provided with a second lead screw mechanism (20), and the second lead screw mechanism (20) is movably connected to a fourth support plate (21). The second lead screw mechanism (20) is perpendicular to the first lead screw mechanism (18); The fourth support plate (21) is provided with a clamping member (22), which clamps the test cutting piece (9).

4. The CNC machine tool dynamic accuracy testing device according to claim 3, characterized in that, The test cutting part (9) is a trapezoidal block, and the upper surface of the clamping part (22) is provided with a trapezoidal groove. The small end of the test cutting part (9) is interference-fitted with the trapezoidal groove.

5. The CNC machine tool dynamic accuracy testing device according to claim 3, characterized in that, The adjustment mechanism (3) includes a fifth support plate (23), which is set on the machine tool fixture table (24). An oil top cylinder (25) is provided on the upper surface of the fifth support plate (23). The upper end of the oil top cylinder (25) is connected to the base (5). The oil top cylinder (25) is connected to a hydraulic pump and a return oil valve.

6. The CNC machine tool dynamic accuracy testing device according to claim 5, characterized in that, The base (5) is provided with a second laser emitter (26), which is located near the frame (6) on the side away from the hinge point with the base (5). The second laser emitter (26) is optically connected to a second laser receiver (27), which is located on the lower surface of the first support plate (14). The second laser receiver (27) is connected to the processor, and the second laser receiver (27) sends the received laser position information to the processor.

7. The CNC machine tool dynamic accuracy testing device according to claim 5, characterized in that, The base (5) is provided with a horizontal sensing mechanism (28), the horizontal sensing mechanism (28) includes a bubble (34) chamber, the bubble (34) chamber includes opposing side walls, the bottom of the side wall is connected to a bottom plate (29), the top of the side wall is connected to a top plate (30), and liquid (33) and bubble (34) are disposed between the side wall, the bottom plate (29) and the top plate (30). A third laser emitter (31) is provided above the top plate (30), and a third laser receiver (32) is provided below the bottom plate (29). The light beam (38) of the third laser emitter (31) is obliquely downward and enters the top plate (30), and the light beam (38) is perpendicular to the longitudinal center line of the top plate (30). The top plate (30) and the bottom plate (29) are both made of transparent material. When the bubble (34) is not located in the path of the light beam (38), the light beam (38) passes through the top plate (30), the liquid (33) and the bottom plate (29) in sequence, and then enters the third laser receiver (32). The top plate (30) is provided with the third laser emitter (31) at both ends above the top plate (30), and the bottom plate (29) is provided with the third laser receiver (32) at both ends below the bottom plate (29). When the bubble (34) is located below the center section of the top plate (30), the light beam (38) is located on both sides of the bubble (34). The third laser receiver (32) is signal-connected to the processor, and the processor is signal-connected to the hydraulic pump and the return valve.

8. The CNC machine tool dynamic accuracy testing device according to claim 3, characterized in that, The frame (6) includes four side walls, and two adjacent side walls are provided with the first laser reflector (11) and the first laser receiver (12). A shielding member (35) is connected between the fourth support plate (21) and the side wall, and the shielding member (35) is made of elastic material.

9. The CNC machine tool dynamic accuracy testing device according to claim 1, characterized in that, The first laser reflector (11) is provided with four, six or eight mounting surfaces.

10. A dynamic accuracy testing device for CNC machine tools according to claim 5, characterized in that, An air spring is provided between the machine tool fixture table (24) and the fifth support plate (23). The air spring includes a rubber air bag (39). The air bag (39) is provided with an air inlet valve (40) and a pressure limiting valve (41). The air inlet valve (40) is connected to the buffer air bag (39). The buffer air bag (39) is connected to an air pump. The airbag (39) is equipped with a pressure sensor, the pressure sensor is connected to the processor, and the processor is connected to the air pump.

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