Broken tool detection device of numerical control machine tool

Abstract

The utility model discloses a numerical control machine tool broken cutter detection device, which belongs to the technical field of machine tool equipment, and comprises a rack, a workbench arranged on the rack, a gantry carriage arranged on the workbench, a mounting bracket arranged on the gantry carriage, and a processing assembly arranged on the mounting bracket, the processing assembly comprises a shell, an electric main shaft, a cutter head and a plurality of ceramic insulation bearings, the electric spindle is rotationally connected with the shell through the ceramic insulation bearing, the tool bit is fixed to the bottom of the electric spindle, the carbon brush is arranged on the top of the electric spindle, the grounding assembly is arranged on the workbench, voltage is applied to the electric spindle through the carbon brush, and real-time monitoring of tool breakage is achieved by means of the insulation characteristic of the ceramic bearing and grounding of a workpiece. The method has the advantages of high real-time performance, high sensitivity, low cost, good reliability and the like, can effectively solve the problems of environmental noise interference, complex deployment, response lag and the like in a traditional detection method, remarkably improves the processing efficiency, reduces resource waste, and is suitable for efficient production in a complex processing scene.

Description

TECHNICAL FIELD

[0001] The utility model discloses a numerical control machine tool broken tool detection device belongs to machine tool equipment technical field. BACKGROUND

[0002] In the field of precision machining, small diameter tools are widely used in the engraving and milling of complex microstructure such as mold cavity, electronic parts and medical devices. However, due to the poor rigidity and low cutting edge strength of small tools, tool breakage is easily caused by cutting force fluctuation, tool eccentric vibration or improper processing parameter matching when processing high-hardness materials or complex curved surfaces. Especially in the long-time continuous processing or unmanned automatic production scene, frequent tool breakage not only significantly increases tool loss cost, but also leads to the decline of processing precision and the deterioration of workpiece surface quality, and even causes workpiece scrap, which seriously restricts the processing efficiency and economic benefit.

[0003] However, the existing monitoring means for tool breakage has obvious limitations: for the instantaneous breakage of small tools, acoustic emission detection is easily disturbed by environmental noise and has high deployment cost, or the visual solution based on image processing is limited by factors such as machining shielding and cutting fluid splashing, making it difficult to realize real-time online monitoring. This leads to the inability to alarm or stop the machine in time after tool breakage, and the machine continues to execute invalid processing programs, resulting in equipment idling, energy waste and loss of production capacity. Therefore, in order to solve this problem, a new scheme needs to be proposed. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the above-mentioned problem and provides a numerical control machine tool broken tool detection device.

[0005] The utility model realizes the above-mentioned purpose through the following technical scheme, a numerical control machine tool broken tool detection device, including the frame, be provided with the workstation on the frame, be provided with the gantry sliding frame on the workstation, be provided with the mounting support on the gantry sliding frame, be provided with the processing assembly on the mounting support, the processing assembly includes the shell, the electric spindle, the tool bit and a plurality of ceramic insulation bearings, the electric spindle is connected with the shell rotation through the ceramic insulation bearing, the tool bit is fixed at the bottom of the electric spindle, the carbon brush is provided at the top of the electric spindle, be provided with the grounding assembly on the workstation.

[0006] Preferably, a plurality of metal support pipes are provided on the workstation, the grounding assembly includes a plurality of grounding wires, one end of the grounding wire is fixed to one side of the metal support pipe through a bolt, and the other end is grounded.

[0007] Preferably, a protective shell for protecting the grounding wire is provided on one side of the frame, a maintenance cover plate is provided at the top end of the protective shell, and the maintenance cover plate is detachably connected with the metal support pipe.

[0008] Preferably, a stable clamp for clamping the workpiece is arranged on the workbench, the stable clamp comprises a metal base, a sliding clamp piece and an adjusting screw rod, the metal base is fixed on the workbench by bolts, the sliding clamp piece is arranged on the metal base in a sliding mode, and the end of the adjusting screw rod is rotationally connected with the sliding clamp piece, and the adjusting screw rod is threadedly connected with the metal base.

[0009] Preferably, a control center is arranged on one side of the rack, and the control center comprises a CNC system display, an operation keyboard, a broken tool warning lamp and an alarm sounder.

[0010] Compared with the prior art, the utility model has the beneficial effects that:

[0011] By arranging the carbon brush on the electric spindle to apply voltage, and by utilizing the insulation characteristics of the ceramic bearing and the design of the grounded workpiece, real-time monitoring of tool breakage is realized, when the tool is normally machined, the system samples a low-level signal, if the tool is broken, a high-level signal is sampled, after filtering and judgment, the system will issue an audible and visual alarm to remind the operator to replace the tool in time, which has the advantages of high real-time, strong sensitivity, low cost, good reliability and the like, can effectively solve the problems of environmental noise interference, complex deployment and response lag in the traditional detection method, significantly improves the machining efficiency and reduces resource waste, and is suitable for efficient production in complex machining scenes. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Fig. 2 It is a schematic diagram of the structure of the machining assembly of the utility model;

[0014] Fig. 3 It is a schematic diagram of the structure of the stable clamp, the grounding assembly and the control center of the utility model.

[0015] Reference signs: 1, rack; 2, workbench; 3, gantry slide; 4, mounting bracket; 5, machining assembly; 6, shell; 7, electric spindle; 8, tool bit; 9, ceramic insulating bearing; 10, carbon brush; 11, metal support pipe; 12, grounding wire; 13, protective shell; 14, maintenance cover plate; 15, metal base; 16, sliding clamp piece; 17, adjusting screw rod; 18, control center; 19, CNC system display; 20, operation keyboard; 21, broken tool warning lamp; 22, alarm sounder. DETAILED DESCRIPTION

[0016] Clearly and completely describe the technical scheme in the embodiments of the utility model in combination with the drawings in the embodiments of the utility model, in the description of the utility model, it is understood that the orientation or position relation indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model, and the indicated device or element must have a specific orientation, a specific orientation and operation, and therefore cannot be understood as a limitation on the utility model, and the described embodiments are only a part of the embodiments of the utility model, and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0017] A kind of numerical control machine tool broken tool detection device, as shown in Fig. Figs. 1-3 It includes rack 1, and rack 1 is provided with workbench 2, and workbench 2 is used to place and process workpiece, and workbench 2 is provided with gantry sliding frame 3, and adjustable mounting bracket 4 is arranged on gantry sliding frame 3, and processing assembly 5 is arranged on mounting bracket 4, and processing assembly 5 specifically includes shell 6, electric spindle 7, tool bit 8 and several ceramic insulation bearings 9, wherein, electric spindle 7 is rotatably connected with shell 6 by ceramic insulation bearing 9, so that electric spindle 7 and shell 6 will not be conductive to each other, to ensure electrical insulation isolation, and ceramic insulation bearing 9 can adopt zirconia material, with high stiffness and high temperature resistance characteristics, can withstand the centrifugal force generated by high-speed rotation of main shaft.

[0018] Tool bit 8 is fixed to the bottom of electric spindle 7 and is used for processing workpiece, and carbon brush 10 is further arranged on the top of electric spindle 7, and the voltage can be applied to electric spindle 7 and tool bit 8 through carbon brush 10, and grounding assembly is arranged on workbench 2, so that the workpiece placed on workbench 2 will also be in the state of grounding, so that tool bit 8 will form a grounded electrical circuit when processing workpiece, carbon brush 10 is connected to CNC system, and the level signal of electric spindle 7 is collected in real time and transmitted to CNC system, so as to detect the level state, if tool bit 8 contacts workpiece during processing, it is low level state, if broken tool occurs, it will be in high level state due to no grounding, so as to detect whether the tool is broken, carbon brush 10 can adopt silver-nickel alloy contact material, so as to ensure low contact resistance and long-term wear resistance, and reduce signal transmission error.

[0019] Several metal support tubes 11 are arranged on workbench 2, metal support tubes 11 are hollow square tubes, and are arranged in order and in line, and the grounding assembly specifically includes several grounding wires 12, one end of the grounding wire 12 is fixed to one side of the metal support tube 11 by a bolt, and the other end is grounded, so that the metal support tube 11 is in the state of grounding, that is, the workbench 2 is in the state of grounding.

[0020] The protection shell 13 is provided with a maintenance cover plate 14 at the top end, and the maintenance cover plate 14 is detachably connected with the metal support pipe 11, so that subsequent disassembly and maintenance inspection are facilitated.

[0021] The workbench 2 is provided with a stable clamp for clamping a workpiece, and the stable clamp comprises a metal base 15, a sliding clamp piece 16 and an adjusting screw rod 17.

[0022] The control center 18 is arranged on one side of the rack 1, and the control center 18 comprises a CNC system display 19, an operation keyboard 20, a broken tool warning light 21 and an alarm sounder 22.

[0023] The utility model discloses a real-time monitoring of tool fracture is realized through above structure, when the tool normal processing, system sampling low level signal, if the broken tool occurs, sampling high level signal, after filtering and judging, system will send out sound and light alarm, remind operator to replace the tool in time, has real-time high, sensitivity strong, low cost, good reliability and so on the advantage, can effectively solve the problem such as environmental noise interference, deployment complex and response lag in traditional detection method, significantly improve the processing efficiency, reduce resource waste, be applicable to the efficient production under the complex processing scene.

[0024] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0025] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A broken tool detection device for a numerical control machine tool, comprising a rack (1), a worktable (2) is arranged on the rack (1), a gantry slide (3) is arranged on the worktable (2), a mounting bracket (4) is arranged on the gantry slide (3), and a machining assembly (5) is arranged on the mounting bracket (4), characterized in that: The machining assembly (5) comprises a housing (6), an electric spindle (7), a tool head (8) and a plurality of ceramic insulation bearings (9), the electric spindle (7) is rotatably connected with the housing (6) through the ceramic insulation bearings (9), the tool head (8) is fixed to the bottom of the electric spindle (7), the top of the electric spindle (7) is provided with a carbon brush (10), and the workbench (2) is provided with a grounding assembly.

2. The broken tool detection device for a CNC machine tool according to claim 1, characterized in that: A plurality of metal supporting pipes (11) are arranged on the workbench (2), the grounding assembly comprises a plurality of grounding wires (12), one end of the grounding wire (12) is fixed to one side of the metal supporting pipe (11) through a bolt, and the other end is grounded.

3. The broken tool detection device for a CNC machine tool according to claim 2, characterized in that: A protective shell (13) for protecting the grounding wire (12) is arranged on one side of the rack (1), a maintenance cover plate (14) is arranged at the top end of the protective shell (13), and the maintenance cover plate (14) is detachably connected with the metal supporting pipe (11).

4. The broken tool detection device for a CNC machine tool according to claim 2, characterized in that: A stable clamp for clamping a workpiece is arranged on the workbench (2), the stable clamp comprises a metal base (15), a sliding clamp piece (16) and an adjusting screw rod (17), the metal base (15) is fixed on the workbench (2) through a bolt, the sliding clamp piece (16) is slidably arranged on the metal base (15), and the end of the adjusting screw rod (17) is rotatably connected with the sliding clamp piece (16).

5. The broken tool detection device for a CNC machine tool according to claim 1, characterized in that: A control center (18) is arranged on one side of the rack (1), the control center (18) comprises a CNC system display (19), an operation keyboard (20), a tool breaking warning lamp (21) and an alarm sounder (22).

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