An automatic tool alignment device for a numerical control machine tool

Abstract

The utility model discloses an automatic tool setting calibration device for numerical control machine tool, including clamping subassembly, clamping subassembly includes clamping cylinder, the inside circumference equidistance fixed mounting of clamping cylinder has a plurality of limit plate, and forms the limit slot between two adjacent limit plate, and the inside rotatory connection of clamping cylinder has vortex groove board, and the sliding setting of vortex groove board and limit slot has clamping plate, and a plurality of clamping plate are used for clamping tool bit, and the bottom fixed connection of clamping cylinder has slide rod, and the bottom fixed connection of slide rod has backing plate, and the sliding setting of slide rod has contact plate, and contact plate can embed the center place of backing plate, and through the drive contact plate and move down, until the calibration lever can not rotate, show that contact plate has contacted closely with work piece at this time, and through the length of contact plate and project backing plate, and then add the length of gasket to backing plate, can obtain the relative distance between tool and work piece datum plane at this time.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool technology, and in particular to an automatic tool setting calibration device for CNC machine tools. Background Technology

[0002] The core reason why CNC machine tools require tool setting is to establish a precise "working coordinate system origin" for the CNC system, allowing the machine tool to "find" the exact position of the workpiece in space. The coordinate instructions in the CNC program are relative to a preset programming origin; however, the machine tool itself does not know the actual relationship between the tool tip and this origin. Tool setting involves measuring and determining the relative distance between the tool and the workpiece reference surface or fixture reference, and inputting this data into the CNC system, thereby precisely aligning the virtual coordinates of the program with the actual machining position.

[0003] In traditional tool setting methods, workers often use a 10mm wide tool setting bar. During operation, while the spindle is rotating, the worker gently moves this tool setting bar of known thickness between the tool end face and the workpiece surface, feeling the change in resistance by hand. When the tool setting bar can be slightly dragged but does not jam or slip freely, it is determined that the tool and the upper surface of the tool setting bar are in contact. At this point, the machine tool's Z-axis mechanical coordinate value is not directly the program origin. The thickness of the tool setting bar must be added to this value before the result is input into the CNC system. Only in this way can the accurate workpiece coordinate system be set.

[0004] While the manual tool setting process using a tool setting bar described above is inexpensive and flexible, it also has significant drawbacks. First, its accuracy is highly dependent on the operator's skill level and feel. Differences in feel between different operators, or even the same operator under different conditions, can directly lead to inconsistent tool setting results, introducing human error that affects machining accuracy. This error is often unacceptable, especially when dealing with high-precision parts. Second, this method is inefficient and time-consuming, requiring the same manual operation steps to be repeated for each tool. The entire process lengthens production preparation time and reduces the effective utilization rate of the machine tool. Therefore, to solve the above problems, an automatic tool setting calibration device for CNC machine tools is proposed. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an automatic tool setting calibration device for CNC machine tools.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An automatic tool setting and calibration device for CNC machine tools includes a clamping assembly. The clamping assembly includes a clamping cylinder. Multiple limiting plates are fixedly installed at equal intervals on the inner circumference of the clamping cylinder. A limiting groove is formed between two adjacent limiting plates. A volute plate is rotatably connected to the inner side of the clamping cylinder. A clamping plate is slidably disposed between the volute plate and the limiting groove. The multiple clamping plates are used to clamp the tool head. The bottom of the clamping cylinder is fixedly connected to a sliding rod, the bottom of the sliding rod is fixedly connected to a pad, and a contact plate is slidably disposed on the sliding rod, the contact plate being able to be embedded in the center of the pad.

[0007] The above technical solution further includes: The clamping assembly also includes a handwheel rotatably connected to the outside of the clamping cylinder, and a bevel gear is fixedly connected to one end of the handwheel extending to the inside of the clamping cylinder. A bevel gear disc that meshes with the bevel gear is fixedly connected to the bottom of the vortex plate.

[0008] The bottom of the vortex plate is fixedly connected to a sleeve that is rotatably connected to the bevel gear disk. A piezoelectric sensor is fixedly connected to the bottom inner side of the sleeve. A gasket is fixedly installed on the top of the piezoelectric sensor. A fixing plate is fixedly connected to the bottom of the clamping cylinder. The fixing plate is fixedly connected to the sleeve.

[0009] A dustproof box is fixedly connected to the inner side of the clamping cylinder. A power supply unit and a controller unit are installed inside the dustproof box. An indicator light is installed on the outer side of the clamping cylinder. The power supply unit, the controller unit, and the indicator light are electrically connected.

[0010] The fixed plate is fixedly connected to the slide rod, and a threaded rod is rotatably connected to the side of the fixed plate away from the slide rod. The threaded rod is threadedly connected to the contact plate, and the threaded rod is rotatably connected to the contact plate.

[0011] A drive assembly is provided at the top of the threaded rod. The drive assembly includes a calibration lever, which is rotatably connected to the threaded rod. A ratchet, which is fixedly connected to the threaded rod, is rotatably connected to the inner side of the calibration lever.

[0012] The calibration lever is symmetrically fixedly mounted with limit screws, and a special-shaped pawl block is provided between the two limit screws. The special-shaped pawl block is symmetrically provided with pawl teeth. The special-shaped pawl block is rotatably located inside the calibration lever. The ratchet only meshes with one pawl tooth. A reversing lever is fixedly mounted on the special-shaped pawl block.

[0013] The calibration lever has an inner mounting groove, and a spring is fixedly connected to the inner side of the mounting groove. A limit ball is fixedly connected to the end of the spring. The irregularly shaped ratchet block has symmetrical abutment grooves, and the limit ball contacts only one abutment groove.

[0014] This utility model has the following beneficial effects: In this invention, the clamping assembly can be used for various sizes of cutting tools. When the cutting tool moves down and contacts the pad, the piezoelectric sensor inside the sleeve can instantly detect the minute pressure change and process the signal through the controller body. Finally, the indicator light illuminates, eliminating the subjective error of manual tool setting.

[0015] In this invention, the contact plate is driven downward by the drive assembly until the calibration lever can no longer rotate, indicating that the contact plate is in close contact with the workpiece. By calculating the length of the contact plate extending out of the pad and adding the length of the shim to the pad, the relative distance between the tool and the workpiece reference surface can be obtained at this time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an automatic tool setting and calibration device for CNC machine tools proposed in this utility model; Figure 2 This is a schematic diagram of the clamping component structure in this utility model; Figure 3 This is a schematic diagram of the internal structure of the clamping cylinder in this utility model. Figure 4 This is a schematic diagram of the drive component structure in this utility model; Figure 5 This is a schematic diagram of the internal structure of the calibration lever in this utility model; Figure 6 This is a schematic diagram of the ratchet and irregularly shaped pawl block structure in this utility model.

[0017] In the diagram: 1. Clamping cylinder; 2. Pad; 3. Contact plate; 4. Slide rod; 5. Fixing plate; 6. Threaded rod; 7. Calibration lever; 10. Limiting plate; 11. Limiting groove; 12. Clamping plate; 13. Scroll groove plate; 14. Handwheel; 15. Bevel gear; 16. Bevel gear disc; 17. Power supply body; 18. Dustproof box; 19. Gasket; 110. Piezoelectric sensor; 111. Sleeve; 112. Indicator light; 113. Controller body; 70. Limiting ball; 71. Ratchet; 72. Reversing lever; 73. Limiting screw; 74. Mounting groove; 75. Spring; 76. Irregularly shaped pawl block; 760. Abutment groove; 761. Pawl teeth. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1 like Figures 1-6 As shown, the present invention proposes an automatic tool setting calibration device for CNC machine tools, including a clamping assembly. The clamping assembly includes a clamping cylinder 1. Multiple limiting plates 10 are fixedly installed at equal intervals on the inner circumference of the clamping cylinder 1. A limiting groove 11 is formed between two adjacent limiting plates 10. A volute plate 13 is rotatably connected to the inner side of the clamping cylinder 1. A clamping plate 12 is slidably arranged between the volute plate 13 and the limiting groove 11. The multiple clamping plates 12 are used to clamp the tool head. A sliding rod 4 is fixedly connected to the bottom of the clamping cylinder 1, and a pad 2 is fixedly connected to the bottom of the sliding rod 4. A contact plate 3 is slidably arranged on the sliding rod 4, and the contact plate 3 can be embedded in the center of the pad 2.

[0020] Example 2 like Figures 1-3 As shown, the clamping assembly also includes a handwheel 14 rotatably connected to the outside of the clamping cylinder 1. A bevel gear 15 is fixedly connected to one end of the handwheel 14 extending to the inside of the clamping cylinder 1. A bevel gear disk 16 that meshes with the bevel gear 15 is fixedly connected to the bottom of the volute plate 13.

[0021] The bottom of the vortex plate 13 is fixedly connected to a sleeve 111 that is rotatably connected to the bevel gear plate 16. A piezoelectric sensor 110 is fixedly connected to the bottom inner side of the sleeve 111. A gasket 19 is fixedly installed on the top of the piezoelectric sensor 110. A fixing plate 5 is fixedly connected to the bottom of the clamping cylinder 1. The fixing plate 5 is fixedly connected to the sleeve 111.

[0022] A dustproof box 18 is fixedly connected to the inside of the clamping cylinder 1. A power supply body 17 and a controller body 113 are installed inside the dustproof box 18. An indicator light 112 is installed on the outside of the clamping cylinder 1. The power supply body 17, the controller body 113 and the indicator light 112 are electrically connected.

[0023] The fixed plate 5 is fixedly connected to the slide rod 4. A threaded rod 6 is rotatably connected to the side of the fixed plate 5 away from the slide rod 4. The threaded rod 6 is threadedly connected to the contact plate 3 and rotatably connected to the pad 2.

[0024] Based on Embodiment 1, in this embodiment, the clamping cylinder 1 is first placed on the outside of the cutter head by the clamping assembly. The end of the cutter head needs to contact the pad 19. When the end of the cutter head contacts the pad 19, a certain force is applied so that the piezoelectric sensor 110 is subjected to the pressure given by the cutter head. The power supply body 17, the controller body 113 and the indicator light 112 are electrically connected. The piezoelectric sensor 110 can instantly detect minute pressure changes and process the signal through the controller body 113. Finally, the indicator light 112 lights up. Then, holding the clamping cylinder 1, ensuring that the indicator light 112 is lit normally, and then driving the bevel gear 15 to rotate by rotating the handwheel 14. The bevel gear 15 meshes with the bevel gear disk 16, and the bevel gear disk 16 is rotatably connected to the clamping cylinder 1. Therefore, the rotation of the bevel gear 15 drives the bevel gear disk 16 to rotate, and the rotation of the bevel gear disk 16 drives the volute plate 13 to rotate. The volute plate 13 is provided with a turbine-shaped groove. The cylindrical slider fixedly connected to the bottom of the clamping plate 12 slides in cooperation with the turbine-shaped groove. Under the limit of the limiting groove 11, the rotation of the volute plate 13 drives multiple clamping plates 12 to move closer or further away simultaneously, thereby clamping tools of different sizes. After clamping is complete, the indicator light 112 needs to remain lit. Then, the cutter head is driven to move down. Since the clamping cylinder 1 is fixedly installed on the cutter head, the clamping cylinder 1 will also move synchronously during the downward movement of the cutter head until the pad 2 is about to contact the bottom workpiece but does not make contact. Then, the height of the contact plate 3 is adjusted until the part of the contact plate 3 protruding from the pad 2 contacts the surface of the workpiece. At this time, the distance between the cutter head and the workpiece is equal to the thickness of the fixed plate 5, the piezoelectric sensor 110 and the pad 19, plus the height from the bottom surface of the pad 2 to the bottom surface of the fixed plate 5, plus the length of the contact plate 3 extending out of the pad 2.

[0025] Example 3 like Figures 1-6 As shown, a drive assembly is provided on the top of the threaded rod 6. The drive assembly includes a calibration lever 7, which is rotatably connected to the threaded rod 6. A ratchet 71, which is fixedly connected to the threaded rod 6, is rotatably connected to the inner side of the calibration lever 7.

[0026] Limiting screws 73 are symmetrically fixedly installed on the calibration lever 7. A special-shaped ratchet block 76 is provided between the two limiting screws 73. The special-shaped ratchet block 76 is symmetrically provided with ratchet teeth 761. The special-shaped ratchet block 76 is rotatably located inside the calibration lever 7. The ratchet 71 only meshes with one ratchet tooth 761. A reversing lever 72 is fixedly installed on the special-shaped ratchet block 76.

[0027] A mounting groove 74 is provided on the inner side of the calibration lever 7. A spring 75 is fixedly connected to the inner side of the mounting groove 74. A limit ball 70 is fixedly connected to the end of the spring 75. Abutment grooves 760 are symmetrically provided on the irregular pawl block 76. The limit ball 70 contacts only one abutment groove 760.

[0028] Based on the above embodiments, in this embodiment, during the downward movement of the adjustment contact plate 3, the pawl teeth 761 on one side of the shaped pawl block 76 are engaged with the ratchet 71 by moving the reversing lever 72. Under the limiting action of the limiting screw 73 on the shaped pawl block 76, the limiting screw 73 on one side is in contact with the shaped pawl block 76. The calibration lever 7 is moved around the central axis of the threaded rod 6. During the rotation of the calibration lever 7, the shaped pawl block 76 is driven to move synchronously around the central axis of the threaded rod 6. The ratchet 71 is fixedly connected to the threaded rod 6 and rotatably connected to the calibration lever 7. Through the meshing action of the pawl teeth 761 and the ratchet 71, when rotating towards the side where the limiting screw 73 is in contact with the shaped pawl block 76, the pawl teeth 761 will abut against the ratchet 71 and drive it to rotate. Furthermore, the ratchet 71 rotates, causing the threaded rod 6 to rotate. The threaded rod 6 is threadedly connected to the contact plate 3. Under the limiting action of the slide rod 4, the contact plate 3 moves downward. Since there is a certain gap between the pad 2 and the workpiece, the contact plate 3 moves downward and extends out of the round hole at the center of the pad 2 until the contact plate 3 contacts the surface of the workpiece. At this time, the calibration lever 7 cannot be rotated, indicating that the contact plate 3 has made close contact with the surface of the workpiece. After completion, the cutter head is moved up, and the handwheel 14 is rotated to make the clamping plate 12 move away from the cutter head. The clamping cylinder 1 is removed, and the distance of the contact plate 3 extending out of the pad 2 is measured with a measuring tool. The distance between the cutter head and the workpiece at this time can be obtained. Furthermore, after the measurement is completed, by reversing the shift lever 72, another pawl tooth 761 engages with the ratchet 71. The calibration lever 7 is rotated in the opposite direction, causing the contact plate 3 to rise and move away from the pad 2. During the engagement of the pawl tooth 761 and the ratchet 71, the calibration lever 7 can only be rotated in the direction where the shaped pawl block 76 contacts the limit screw 73 to make the shaped pawl block 76 abut against the ratchet 71 and rotate. Otherwise, the ratchet 71 will not rotate, which greatly improves the convenience of operation.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic tool setting and calibration device for CNC machine tools, comprising a clamping assembly, characterized in that, The clamping assembly includes a clamping cylinder (1), and multiple limiting plates (10) are fixedly installed at equal intervals on the inner circumference of the clamping cylinder (1). A limiting groove (11) is formed between two adjacent limiting plates (10). A vortex plate (13) is rotatably connected to the inner side of the clamping cylinder (1). A clamping plate (12) is slidably arranged between the vortex plate (13) and the limiting groove (11). The multiple clamping plates (12) are used to clamp the cutting head. The bottom of the clamping cylinder (1) is fixedly connected to a slide rod (4), the bottom of the slide rod (4) is fixedly connected to a pad (2), and a contact plate (3) is slidably arranged on the slide rod (4). The contact plate (3) can be embedded in the center of the pad (2).

2. The automatic tool setting calibration device for CNC machine tools according to claim 1, characterized in that, The clamping assembly also includes a handwheel (14) rotatably connected to the outside of the clamping cylinder (1), and a bevel gear (15) is fixedly connected to one end of the handwheel (14) extending to the inside of the clamping cylinder (1). A bevel gear disc (16) that meshes with the bevel gear (15) is fixedly connected to the bottom of the vortex plate (13).

3. The automatic tool setting calibration device for CNC machine tools according to claim 2, characterized in that, The bottom of the vortex plate (13) is fixedly connected to a sleeve (111) that is rotatably connected to the bevel gear plate (16). The bottom inner side of the sleeve (111) is fixedly connected to a piezoelectric sensor (110). A gasket (19) is fixedly installed on the top of the piezoelectric sensor (110). The bottom of the clamping cylinder (1) is fixedly connected to a fixing plate (5). The fixing plate (5) is fixedly connected to the sleeve (111).

4. The automatic tool setting calibration device for CNC machine tools according to claim 1, characterized in that, A dustproof box (18) is fixedly connected to the inner side of the clamping cylinder (1). A power supply body (17) and a controller body (113) are installed inside the dustproof box (18). An indicator light (112) is installed on the outer side of the clamping cylinder (1). The power supply body (17), the controller body (113) and the indicator light (112) are electrically connected.

5. The automatic tool setting calibration device for CNC machine tools according to claim 3, characterized in that, The fixed plate (5) is fixedly connected to the slide rod (4). A threaded rod (6) is rotatably connected to the side of the fixed plate (5) away from the slide rod (4). The threaded rod (6) is threadedly connected to the contact plate (3). The threaded rod (6) is rotatably connected to the pad plate (2).

6. The automatic tool setting calibration device for CNC machine tools according to claim 5, characterized in that, The top of the threaded rod (6) is provided with a drive assembly, which includes a calibration lever (7). The calibration lever (7) is rotatably connected to the threaded rod (6), and the inner side of the calibration lever (7) is rotatably connected to a ratchet (71) that is fixedly connected to the threaded rod (6).

7. An automatic tool setting calibration device for CNC machine tools according to claim 6, characterized in that, Limiting screws (73) are symmetrically fixedly installed on the calibration lever (7). A special-shaped ratchet block (76) is provided between the two limiting screws (73). A ratchet tooth (761) is symmetrically provided on the special-shaped ratchet block (76). The special-shaped ratchet block (76) is rotatably located on the inner side of the calibration lever (7). The ratchet wheel (71) only meshes with one ratchet tooth (761). A reversing lever (72) is fixedly installed on the special-shaped ratchet block (76).

8. An automatic tool setting calibration device for CNC machine tools according to claim 7, characterized in that, The calibration lever (7) has an installation groove (74) on its inner side. A spring (75) is fixedly connected to the inner side of the installation groove (74). A limiting ball (70) is fixedly connected to the end of the spring (75). Abutment grooves (760) are symmetrically opened on the irregular pawl block (76). The limiting ball (70) contacts only one abutment groove (760).

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