A tool break detection device and method

Abstract

The present application relates to the field of machine tool, and particularly relates to a tool broken tool detection device and method, which comprises: a swing rod is driven to rotate through a scanner, when the swing rod rotates and touches a to-be-detected tool, the scanner records the angle of the swing rod rotation, obtains the to-be-detected tool angle and sends it to a processor, the to-be-detected tool angle is compared with the standard tool angle collected in the processor in advance, to determine whether the to-be-detected tool has a broken tool condition, and in the case that the to-be-detected tool angle is less than the difference between the standard tool angle and the angle tolerance, the processor outputs a first signal that the to-be-detected tool has a broken tool. When the machine tool system receives the first signal, an alarm is sent and the machine tool is controlled to stop working, and a worker replaces the to-be-detected tool and checks whether the workpiece is damaged.

Description

Technical Field

[0001] The present invention relates to the field of machine tools, and in particular to a tool breakage detection device and method. Background Art

[0002] Unmanned production lines are a growing trend in today's intelligent factories. However, tool breakage often goes undetected during the production process, leading to incomplete parts being passed on to the next process. Excessive stock removal can lead to substandard parts or outright scrapping, or even serious damage to the machine tool, resulting in significant economic losses. Therefore, tool inspection is essential.

[0003] There are two main types of existing broken knife detection technologies: offline detection and real-time monitoring. Offline detection is to set up an independent broken knife detection system to detect the tool offline. However, this method will sacrifice processing time and affect processing efficiency. At the same time, the tool needs to be manually placed in the specified position, and the degree of automation is low. Real-time monitoring is to monitor the tool status in real time by collecting tool images, induced voltage, cutting vibration and other signals during the processing. However, this method is easily affected by complex processing environments such as cutting fluid, noise, chatter, etc., and is prone to misjudgment. For example, the Chinese patent for a method for automatic detection of broken cutting tools based on current analysis (patent number: CN104880488B) uses the analysis results of the load motor current data as the judgment basis for whether the cutting tool is broken. When the current detection fails, the current-based detection is prone to misjudgment.

[0004] Based on the above, both the existing offline detection and real-time monitoring methods have shortcomings and need to be improved. Summary of the Invention

[0005] To solve the above problems, the purpose of the present invention is to provide an efficient and accurate tool breakage detection device and method, which can detect the tools replaced in each process in the tool magazine without taking up processing time and avoiding the influence of complex cutting environments such as cutting fluid.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] The present invention provides a tool breakage detection device, comprising:

[0008] Mounting bracket,

[0009] A scanner is arranged on a mounting bracket;

[0010] A rotating disk is coaxial with the scanner and rotatably arranged on the scanner;

[0011] The pendulum is arranged perpendicular to the axis of the rotating disk and passes through the rotating disk from the side of the rotating disk. The scanner is used to drive the pendulum to rotate and touch the tip of the tool to be measured to obtain the angle of the pendulum rotation, thereby obtaining the angle of the tool to be measured;

[0012] The processor is connected to the scanner and is used to obtain the angle of the tool to be measured. The processor is used to compare the angle of the tool to be measured with the angle of the standard tool to determine whether the tool to be measured is broken.

[0013] In one embodiment, a rod slot is formed on a side of the rotating disk away from the mounting bracket, and the rocker arm passes through the rod slot.

[0014] In one embodiment, at least one top cover is provided on both sides of the rod groove, and the top cover portion is pressed onto the rocker rod.

[0015] In one embodiment, a first through hole is provided on the mounting bracket, and the scanner is inserted into the first through hole; the mounting bracket includes a first bracket and a second bracket that are detachably connected, and the first bracket and the second bracket form the first through hole when connected.

[0016] In one embodiment, the swing arm includes a head and a rod, the rod passes through the rod slot, the diameter of the head is larger than the width of the rod slot, and a touch plate for touching the tool is provided on a side of the rod away from the head; and / or,

[0017] A center hole is provided at the center of the rotating disk, and the center hole is located in the rod groove. An opening is provided on the rotating disk, and the opening passes through the rotating disk along the axis of the rotating disk and perpendicular to the rod groove, and one side of the opening extends to the side of the rotating disk, and the other side of the opening extends to a preset depth on the side of the rod groove, dividing the rotating disk into a first disk structure and a second disk structure connected to each other, and the opening passes through the center hole;

[0018] A fastening hole is provided on the side of the rotating disk, and the fastening hole passes through the first disk structure to the second disk structure.

[0019] A machine tool comprises a machine tool body and any one of the above-mentioned tool breakage detection devices, wherein the tool breakage detection device is arranged on the machine tool body.

[0020] In one embodiment, a tool magazine is provided on the machine tool body, and a tool detection position is provided on the tool magazine. The tool to be tested in the tool magazine is exchanged to the tool detection position, and the scanner drives the swing arm to rotate and touch the tip of the tool to be tested, and obtains the angle of the tool to be tested;

[0021] The processor is used to compare the angle of the tool to be measured with the standard tool angle stored in the processor memory. When the angle of the tool to be measured is smaller than the difference between the standard tool angle and the angle tolerance, the processor outputs a first signal indicating that the tool to be measured has broken, and the angle tolerance is a preset value; when the angle of the tool to be measured is within the normal angle range, the processor outputs a second signal indicating that the tool to be measured has not broken; the normal angle range is [α0-α, α0+α], where α0 is the standard tool angle and α is the preset angle tolerance.

[0022] A tool breakage detection method, wherein the tool breakage detection device of any one of the above is used to detect the angle of the tool to be detected, comprises the following steps:

[0023] Collect the angle information of the standard tool to obtain the standard tool angle;

[0024] Perform angle detection on the tool to be measured to obtain the angle of the tool to be measured;

[0025] When the angle of the tool to be measured is less than the tool breakage angle, a first signal indicating that the tool to be measured has broken is output. The tool breakage angle is the difference between the standard tool angle and the angle tolerance, and the angle tolerance is a preset value.

[0026] Based on the first signal, issuing an alarm signal and a machine tool stop signal for controlling the machine tool to stop working;

[0027] Based on the machine tool stop working signal, the machine tool stops working.

[0028] In one embodiment, after performing angle detection on the tool to be measured and obtaining the angle of the tool to be measured, the method further includes:

[0029] When the angle of the tool to be measured is within the normal angle range, a second signal is outputted indicating that the tool to be measured is not broken; the normal angle range is [α0-α, α0+α], where α0 is the standard tool angle and α is the angle tolerance.

[0030] In one embodiment, when the angle of the tool to be measured is less than the tool breakage angle, a first signal indicating that the tool to be measured has broken is output, and the method further includes:

[0031] Determine whether the angle tolerance meets the requirements based on the length of the pendulum rod;

[0032] The specific method to determine whether the angle tolerance meets the requirements based on the length of the pendulum rod is:

[0033] The tool length deviation ΔL caused by the angle tolerance is calculated using the first tool length deviation formula α :

[0034] ΔL α =L×sinα

[0035] The tool length deviation ΔL1 caused by the scanner's repeatability is calculated using the second tool length deviation formula:

[0036] ΔL1=L×sinΨ

[0037] Assume that the tool length deviation caused by environmental factors is ΔL2;

[0038] Assume that the tool length deviation due to uncertainty exceeds ΔL3:

[0039] ΔL3=ΔL1+ΔL2

[0040] Assume that the tool length deviation caused by the tool breakage is ΔL;

[0041] When ΔL>ΔL α >ΔL3, it is judged that the set angle tolerance meets the requirements;

[0042] Where L is the length of the pendulum, α is the angle tolerance, and Ψ is the repeatability of the scanner.

[0043] The beneficial effect of the present invention lies in: a scanner drives the pendulum to rotate. When the pendulum rotates and touches the tool to be tested, the scanner records the pendulum's rotation angle, obtains the angle of the tool to be tested, and sends it to the processor. The measured tool angle is compared with the standard tool angle previously collected by the processor to determine whether the tool to be tested is broken. If the measured tool angle is less than the difference between the standard tool angle and the angle tolerance, the processor outputs a first signal indicating that the tool to be tested has broken. Upon receiving this first signal, the machine tool system issues an alarm and controls the machine tool to stop operation, allowing personnel to replace the tool to be tested and inspect the workpiece for damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0045] Figure 1 The present invention provides a tool breakage detection device;

[0046] Figure 2 This is a schematic diagram of a tool magazine provided by the present invention equipped with a tool breakage detection device;

[0047] Figure 3 This is a partial enlarged view of the tool breakage detection device provided by the present invention installed on the tool magazine;

[0048] Figure 4 It is a structural schematic diagram of the rotating disk provided by the present invention;

[0049] Figure 5 The present invention provides a flow chart of a method for detecting tool breakage.

[0050] The figures are marked as follows: 1-mounting bracket, 2-rotating disk, 3-scanner, 4-rocker, 5-rod slot, 6-top cover, 7-first bracket, 8-second bracket, 9-head, 10-rod, 11-touch plate, 12-tool magazine, 13-center hole, 14-opening, 15-first disk structure, 16-second disk structure. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0052] refer to Figures 1 to 3 A tool breakage detection device according to an embodiment of the present invention includes: a mounting bracket 1, a rotating disk 2, a rocker arm 4 and a processor. The mounting bracket 1 includes a first bracket 7 and a second bracket 8 that are detachably connected. An arc-shaped or semicircular recessed structure is provided on the first bracket 7, and an arc-shaped or semicircular recessed structure is provided on the second bracket 8. When the first bracket 7 and the second bracket 8 are connected, the two recessed structures form a first through hole for installing a scanner 3, and the scanner 3 is inserted into the first through hole. The rotating disk 2 is coaxially arranged with the scanner 3, and the rotating disk 2 is rotatably mounted on the scanner 3. The pendulum rod 4 is perpendicular to the axis of the rotating disk, so that the pendulum rod 4 and the rotating disk 2 are in a vertical state, and the pendulum rod 4 passes through the rotating disk 2 from the side of the rotating disk 2. The scanner 3 drives the rotating disk 2 to rotate. The pendulum rod 4 preferably rotates clockwise, and the preferred rotation angle is 0-300 degrees. Since the pendulum rod 4 is inserted on the rotating disk 2, the rotating disk 2 can drive the pendulum rod 4 to rotate. When the rotating disk 2 drives the pendulum rod 4 to rotate until it touches the tip of the tool to be measured, the scanner 3 records the angle value of the pendulum rod 4, obtains the angle of the tool to be measured, and transmits the angle of the tool to be measured to the processor. In this embodiment, the scanner 3 transmits information to the processor via a cable.

[0053] After the processor obtains the angle of the tool to be measured collected by the scanner 3, it compares the angle of the tool to be measured with the standard tool angle stored in the processor. The standard tool angle is based on the detection device, and when the tool is not in use, the signal acquisition angle of the standard tool is performed. When the angle of the tool to be measured is less than the tool breaking angle, the processor outputs a first signal indicating that the tool to be measured has broken. The tool breaking angle is the difference between the standard tool angle and the angle tolerance. After the machine tool using the detection device of the present invention receives the first signal, the machine tool will sound an alarm, and the machine tool control system will control the machine tool to stop working. The machine tool operator can then go to the site to replace the tool and check whether the workpiece is damaged. For example, the standard tool angle is α0, and the tool to be measured angle is α n , the angle tolerance is α, then when the formula α is satisfied n <α0-α, it means that the tool to be tested is broken. The processor transmits a KO signal (first signal) to the machine tool control system. The machine tool immediately stops processing and issues an alarm to prompt the operator to replace the tool.

[0054] On the contrary, when the angle of the tool to be measured is within the normal angle range, the second signal indicating that the tool to be measured is not broken is output; the normal angle range is [α0-α, α0+α], that is, α0+α≥α n ≥α0-α, where α0 is the standard tool angle and α is the preset angle tolerance.

[0055] Since scanner 3 has repeated positioning errors and is affected by external vibration and other environmental factors, by directly comparing α0 with α n Judging whether a tool is broken or not is easy to cause misjudgment. The above-mentioned influencing factors are defined as the uncertainty of the detection system. Therefore, it is necessary to set the angle tolerance α according to the actual situation to avoid misjudgment. The tool length deviation caused by the set α should be between the tool length deviation caused by the system uncertainty and the broken tool length. For example, the angle tolerance α is set to 0.1°, and the length of the pendulum 4 used in the detection system of this embodiment is L = 510mm. Therefore, the tool length deviation ΔL caused by the angle tolerance is α As shown in the following formula:

[0056] ΔL α =L×sinα=510×sin(0.1°)=0.890mm

[0057] In this embodiment, the sensitivity ξ of the scanner 3 used in the detection system is within 0.001°, and the repeatability accuracy Ψ is within 0.05°. Therefore, the tool length deviation ΔL1 caused by the repeatability accuracy of the scanner 3 is expressed as follows:

[0058] ΔL1=L×sinΨ=510×sin(0.05°)=0.445mm

[0059] Assuming that the tool length measurement deviation ΔL2 caused by environmental factors such as vibration is 0.002 mm, the tool length deviation caused by the uncertainty of the detection system does not exceed ΔL3:

[0060] ΔL3=ΔL1+ΔL2=0.445+0.002=0.447mm

[0061] The tool length deviation ΔL caused by tool breakage is in the millimeter range, so ΔL>ΔL α >ΔL3 requirement.

[0062] In one embodiment, reference Figure 1 A rod groove 5 is provided on the side of the rotating disk 2 away from the mounting bracket 1, and the rocker arm 4 passes through the rod groove 5, which plays a supporting and positioning role.

[0063] In one embodiment, reference Figure 1 At least one top cover 6 is provided on both sides of the rod groove 5, which is pressed onto the rocker rod 4 by the top cover 6, so that the rocker rod 4 is positioned in the rod groove 5. For example, a top cover 6 is provided on each side of the rod groove 5, and the top cover 6 coincides with the projection of the bottom of the rod groove 5, so that the top cover 6 can be closed on the rocker rod 4, thereby forming a positioning effect on the rocker rod 4.

[0064] In one embodiment, reference Figure 1 The swing rod 4 includes a head 9 and a rod 10. The rod 10 passes through the rod slot 5. The diameter of the head 9 is larger than the width of the rod slot 5. Therefore, the head 9 and the rod slot 5 form a limit, so that the swing rod 4 will not slip out of the rod slot 5. A touch plate 11 for contacting the tool is provided on the side of the rod 10 away from the head 9. The touch plate 11 has a certain width and contacts the tool smoothly to avoid scratching the tool.

[0065] In one embodiment, reference Figure 1 and Figure 4A center hole 13 is provided at the center of the rotating disk 2, and the center hole 13 is located in the rod groove 5. An opening 14 is provided on the rotating disk 2, and the opening 14 passes through the rotating disk 2 along the axis of the rotating disk 2 from one end surface of the rotating disk 2, and the opening 14 is perpendicular to the rod groove 5. One side of the opening 14 extends to the side of the rotating disk 2, and the other side of the opening 14 extends to a preset depth on the side of the rod groove 5, dividing the rotating disk 2 into a first disk structure 15 and a second disk structure 16 connected. The opening 14 passes through the center hole 13, and a fastening hole is provided on the side of the rotating disk 2, and the fastening hole passes through the first disk structure 15 to the second disk structure 16. During use, align the center hole 13 on the rotating disk 2 with the hole on the scanner 3, then use a pin to insert the center hole into the scanner 3, and then use the bolt fastening hole to insert the bolt into the first disk structure 15 and the second disk structure 16. By tightening the bolt, the tightness of the first disk structure 15 and the second disk structure 16 is adjusted to adjust the tightness of the connection between the rotating disk 2 and the scanner 3.

[0066] The detection device of the present invention is described as follows:

[0067] Structural reference of detection device Figure 1 As shown, the rocker 4 for detecting the tool position is fixed on the rocker fixture (rotating disk 2) through two top covers 6. Figure 4 As shown, the middle circular hole of the swing arm fixture is matched with the scanner 3 and fastened by bolts. The mounting bracket 1 is divided into two parts, the upper and lower parts, and the scanner 3 is clamped and fixed by bolts. The mounting bracket 1 can be fixed to the appropriate position in the tool magazine 12 by bolts and nuts, thereby completing the fixation of the entire detection device. Take the detection process of a tool in the tool magazine 12 as an example, Figure 2 and Figure 3 As shown, this is a schematic diagram of the tool magazine 12 (a cutout portion). The pendulum 4 swings in the direction of the dotted arrow, and the scanner 3 drives the pendulum fixture to drive the pendulum 4 to swing toward the tool. When the pendulum 4 contacts the tool tip, the scanner 3 records the detected angle value. In this embodiment, the detected angle value is α0=61.035°, and α0 is transmitted to the processor via a cable.

[0068] In another embodiment, the present invention provides a machine tool comprising a machine tool body and any one of the aforementioned device for detecting tool breakage within a tool magazine 12, wherein the device is mounted on the machine tool body. By mounting the device on the machine tool, the tool within the tool magazine 12 can be inspected.

[0069] Furthermore, a tool magazine is provided on the machine tool body, and a tool position is provided on the tool magazine. A number of tools are arranged in the tool magazine, and the number of tools can be regarded as tools to be tested. During the processing, the tool replaced in a certain process (tool to be tested) is tested at the tool detection position. During the detection, the next process of the machine tool has already started, which will not affect the processing efficiency, so as to ensure the high processing efficiency of the machine tool. Once the tool is detected to be broken, the machine tool needs to stop working immediately to replace the new tool and check whether the workpiece is damaged, so as to make the subsequent choice of scrapping the part, repeating the previous process, or continuing processing.

[0070] The scanner drives the pendulum to rotate and touch the tip of the tool to be measured, and obtains the angle of the tool to be measured.

[0071] The processor compares the angle of the tool being measured with the standard tool angle stored in the processor. If the angle is less than the difference between the standard tool angle and the angle tolerance, the processor outputs a first signal indicating that the tool being measured has broken. The angle tolerance is a preset value. If the angle is within a normal angle range, the processor outputs a second signal indicating that the tool being measured has not broken. The normal angle range is [α0-α, α0+α], where α0 is the standard tool angle and α is the preset angle tolerance. When the machine tool control center receives the first signal, it controls the machine tool to stop machining.

[0072] In another embodiment, reference Figure 1 and Figure 5 The present invention provides a tool breakage detection method, which uses a tool breakage detection device in a tool magazine 12 to detect the angle of the tool to be detected. The method includes the following steps:

[0073] S100: collecting angle information of a standard tool to obtain a standard tool angle;

[0074] S200: Detecting the angle of the tool to be measured and obtaining the angle of the tool to be measured;

[0075] S300: When the angle of the tool to be measured is less than the tool breakage angle, a first signal indicating that the tool to be measured has broken is output. The tool breakage angle is the difference between the standard tool angle and the angle tolerance, and the angle tolerance is a preset value.

[0076] S400: Based on the first signal, issuing an alarm signal and a machine tool stop signal for controlling the machine tool to stop working;

[0077] S500: Based on the machine tool stop working signal, the machine tool stops working.

[0078] The present invention uses a scanner 3 to drive a pendulum 4 to rotate. When the pendulum 4 rotates and touches the tool to be tested, the scanner 3 records the rotation angle of the pendulum 4, obtains the angle of the tool to be tested, and sends it to the processor. The measured tool angle is then compared with the standard tool angle previously collected by the processor to determine whether the tool to be tested is broken. If the measured tool angle is less than the difference between the standard tool angle and the angle tolerance, the processor outputs a first signal indicating that the tool to be tested has broken. Upon receiving this first signal, the machine tool system issues an alarm and controls the machine tool to stop operation, allowing personnel to replace the tool to be tested.

[0079] It should be noted that the tool under test is a tool that has been replaced in a certain process. During the inspection, the next process has already begun, so the processing efficiency will not be affected, thus ensuring high processing efficiency. If a tool breakage is detected, the machine tool must be stopped immediately, the tool must be replaced, and the workpiece must be inspected for damage. This allows the decision to be made whether to scrap the part, repeat the previous process, or continue processing.

[0080] In one embodiment, after performing angle detection on the tool to be measured and obtaining the angle of the tool to be measured, the method further includes:

[0081] When the angle of the tool to be measured is within the normal angle range, a second signal is outputted indicating that the tool to be measured is not broken; the normal angle range is [α0-α, α0+α], where α0 is the standard tool angle and α is the angle tolerance.

[0082] Specifically, if the tool angle α to be measured n Within the standard tool angle α0 and angle tolerance range α, that is, α0+α≥α n ≥α0-α, indicating that the angle of the tool to be measured is within the normal range, the processor transmits an OK signal (first signal) to the machine tool control system; on the contrary, if α n <α0-α, that is, the detected tool breaks, and the processor transmits the KO signal (second signal) to the machine tool control system; since when the angle tolerance α is set, the tool length deviation caused by α is greater than the tool length deviation caused by the uncertainty of the detection system, α will not occur. n >α0+α.

[0083] In one embodiment, when determining whether the tool to be tested is broken, if the angle of the tool to be tested is less than the tool breakage angle, a first signal indicating that the tool to be tested is broken is output, and the method further includes:

[0084] Determine whether the angle tolerance meets the requirements based on the length of the pendulum rod 4;

[0085] The angle tolerance is determined based on the length of the pendulum rod 4 to see whether it meets the requirements:

[0086] The tool length deviation ΔL caused by the angle tolerance is calculated using the first tool length deviation formula α :

[0087] ΔL α =L×sinα

[0088] The tool length deviation ΔL1 caused by the repeatability of scanner 3 is calculated using the second tool length deviation formula:

[0089] ΔL1=L×sinΨ

[0090] Assume that the tool length deviation caused by environmental factors is ΔL2;

[0091] Assume that the tool length deviation due to uncertainty exceeds ΔL3:

[0092] ΔL3=ΔL1+ΔL2

[0093] Assume that the tool length deviation caused by the tool breakage is ΔL;

[0094] When ΔL>ΔL α >ΔL3, it is judged that the set angle tolerance meets the requirements;

[0095] Wherein, L is the length of the pendulum 4 , α is the angle tolerance, and Ψ is the repeatability value of the scanner 3 .

[0096] The following describes in detail the method for detecting internal breakage of the tool magazine 12 according to the present invention through specific embodiments:

[0097] Step one, collect the standard tool angle α0, based on the detection device, collect the standard tool signal α0 when the tool is not in use. Among them, the detection device mainly includes: a pendulum 4 for detecting the tool position, a pendulum fixture (rotating disk 2) for installing the pendulum 4, a scanner 3 for driving the pendulum fixture and collecting signals, a mounting bracket 1 for fixing the scanner 3, and a processor for analysis and calculation. The signal collection steps are: first, according to the mechanical action rhythm, the pendulum 4 is driven by the scanner 3 and swings toward the target position. When the pendulum 4 contacts the tip of the tool, the scanner 3 records the detected angle value α0, and further transmits it to the processor, for example, reference Figure 3 The pendulum 4 swings in the direction of the dotted arrow. The scanner 3 drives the pendulum fixture to swing the pendulum 4 toward the tool. When the pendulum 4 contacts the tool tip, the scanner 3 records the detected angle value α0 = 61.035°. In this embodiment, α0 is transmitted to the processor via a cable.

[0098] Step 2: Based on the method of step 1, drive the pendulum 4 to swing towards the tool to be tested. The swing direction is set in the clockwise direction. The swing angle range of the pendulum is 0-300 degrees. When the pendulum 4 contacts the tool tip, record the detected angle value α n =61.022°, and α is connected to n Transfer to the processor.

[0099] Step 3: Set the angle tolerance α = 0.1°. Since the scanner 3 has repeated positioning errors and is affected by external vibration and other environmental factors, the angle tolerance is set by directly comparing α0 with α n Determining tool breakage based on size can easily lead to misjudgment. These factors are defined as the uncertainty of the detection system. Therefore, it is necessary to set an angle tolerance α based on actual conditions to avoid misjudgment. The tool length deviation caused by the set α should be between the tool length deviation caused by system uncertainty and the tool breakage length.

[0100] The length of the pendulum 4 used in the detection system of this embodiment is L = 510 mm, so the tool length deviation ΔL caused by the angle tolerance is α As shown in the following formula:

[0101] ΔL α =L×sinα=510×sin(0.1°)=0.890mm

[0102] In this embodiment, the sensitivity ξ of the scanner 3 used in the detection system is within 0.001°, and the repeatability accuracy Ψ is within 0.05°. Therefore, the tool length deviation ΔL1 caused by the repeatability accuracy of the scanner 3 is expressed as follows:

[0103] ΔL1=L×sinΨ=510×sin(0.05°)=0.445mm

[0104] Assuming that the tool length measurement deviation ΔL2 caused by environmental factors such as vibration is 0.002 mm, the tool length deviation caused by the uncertainty of the detection system does not exceed ΔL3:

[0105] ΔL3=ΔL1+ΔL2=0.445+0.002=0.447mm

[0106] The tool length deviation ΔL caused by tool breakage is in the millimeter range, so ΔL>ΔL α >ΔL3 requirement.

[0107] Step 4: Determine whether the tool under test is broken. If the tool angle signal α n Within the standard tool signal α0 and the angle tolerance range α, that is, α0+α≥α n≥α0-α, indicating that the tool under inspection is within the normal range, the processor transmits an OK signal to the machine control system; otherwise, if α n <α0-α, that is, the detected tool breaks, and the processor transmits a KO signal to the machine tool control system. For example, according to the above steps, α0=61.035°, α=0.1°, α n =61.022°. Satisfies α0+α≥α n ≥α0-α, indicating that the inspected tool is within the normal range, and the processor transmits an OK signal to the machine tool control system.

[0108] Step 5: Based on the feedback signal from the processor, the machine tool makes corresponding instructions. As can be seen from step 4, the machine tool processor receives the OK signal and the machine tool operates normally. In particular, if α n <α0-α, it means that the tool being inspected is broken. The processor transmits a KO signal to the machine tool control system. The machine tool immediately stops processing and issues an alarm to prompt the operator to replace the tool.

[0109] Furthermore, signal transmission between the processor and the machine tool controller is performed by the processor's own I / O or bus communication module.

[0110] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A tool breakage detection device, characterized in that: include: Mounting bracket (1), A scanner (3) is arranged on the mounting bracket (1); A rotating disk (2) is coaxial with the scanner and rotatably arranged on the scanner (3); A pendulum rod (4) is arranged perpendicular to the axis of the rotating disk and passes through the rotating disk (2) from the side of the rotating disk. The scanner (3) is used to drive the pendulum rod (4) to rotate and touch the tip of the tool to be measured, so as to obtain the rotation angle of the pendulum rod (4) and thus obtain the angle of the tool to be measured; A processor connected to the scanner (3) is used to obtain the angle of the tool to be measured, and the processor is used to compare the angle of the tool to be measured with the angle of a standard tool to determine whether the tool to be measured is broken; Wherein, a rod slot (5) is provided on a side of the rotating disk (2) away from the mounting bracket (1), and the swing rod (4) passes through the rod slot (5); At least one top cover (6) is provided on both sides of the rod groove (5), and a portion of the top cover (6) is pressed onto the rocker rod (4); The tool breakage detection method based on the tool breakage detection device comprises the following steps: S100: collecting angle information of a standard tool to obtain a standard tool angle; S200: Detecting the angle of the tool to be measured and obtaining the angle of the tool to be measured; S300: When the angle of the tool to be measured is less than the tool breakage angle, a first signal indicating that the tool to be measured has broken is output, wherein the tool breakage angle is the difference between the standard tool angle and an angle tolerance, and the angle tolerance is a preset value; When the angle of the tool to be measured is less than the tool breakage angle, a first signal indicating that the tool to be measured has broken is output, and the method also includes: determining whether the angle tolerance meets the requirements based on the length of the pendulum rod (4); The method of determining whether the angle tolerance meets the requirements based on the length of the pendulum rod (4) is as follows: The tool length deviation ΔL caused by the angle tolerance is calculated using the first tool length deviation formula. α : ΔL α =L×sinα; The tool length deviation ΔL1 caused by the repeatability of the scanner (3) is calculated using the second tool length deviation formula: ΔL1=L×sinΨ; Assume that the tool length deviation caused by environmental factors is ΔL2; Assume that the tool length deviation due to uncertainty exceeds ΔL3: ΔL3=ΔL1+ΔL2; Assume that the tool length deviation caused by the tool breakage is ΔL; When ΔL>ΔL α >ΔL3, it is determined that the set angle tolerance meets the requirement; Wherein, L is the length of the pendulum (4), α is the angle tolerance, and Ψ is the repeatability value of the scanner (3).

2. The tool breakage detection device according to claim 1, characterized in that: A center hole (13) is provided at the center of the rotating disk (2), and the center hole (13) is located in the rod groove (5). An opening (14) is provided on the rotating disk (2), one side of the opening (14) extends to the side of the rotating disk (2), and the other side of the opening (14) extends to a preset depth on the side of the rod groove (5), and the opening (14) passes through the center hole (13).

3. The tool breakage detection device according to claim 1, characterized in that: The mounting bracket (1) is provided with a first through hole, and the scanner (3) is inserted into the first through hole; the mounting bracket (1) comprises a first bracket (7) and a second bracket (8) that are detachably connected, and the first bracket (7) and the second bracket (8) form the first through hole when connected.

4. The tool breakage detection device according to claim 2, characterized in that: The swing rod (4) comprises a head (9) and a rod (10), the rod (10) passes through the rod slot (5), the diameter of the head (9) is larger than the width of the rod slot (5), and a contact plate (11) for contacting a tool is provided on a side of the rod (10) away from the head (9); and / or, The opening (14) passes through the rotating disk (2) along the axis of the rotating disk (2) and perpendicular to the rod groove (5), dividing the rotating disk (2) into a first disk structure (15) and a second disk structure (16) connected to each other; A fastening hole is provided on the side of the rotating disk, and the fastening hole passes through from the first disk structure to the second disk structure.

5. The tool breakage detection device according to claim 1, characterized in that: When the angle of the tool to be measured is less than the tool breakage angle, after outputting the first signal that the tool to be measured is broken, the method further includes: Based on the first signal, issuing an alarm signal and a machine tool stop signal for controlling the machine tool to stop working; Based on the machine tool stop operation signal, the machine tool stops operating.

6. The tool breakage detection device according to claim 5, characterized in that: After performing angle detection on the tool to be measured and obtaining the angle of the tool to be measured, the method further includes: When the angle of the tool to be measured is within the normal angle range, a second signal is outputted indicating that the tool to be measured is not broken; the normal angle range is [α0-α, α0+α], where α0 is the standard tool angle and α is the angle tolerance.

7. A machine tool, characterized in that: It comprises a machine tool body and a tool breakage detection device according to any one of claims 1 to 6, wherein the tool breakage detection device is arranged on the machine tool body.

8. The machine tool according to claim 7, characterized in that The machine tool body is provided with a tool magazine (12), and the tool magazine (12) is provided with a tool detection position. The tool to be measured in the tool magazine (12) is exchanged to the tool detection position, and the scanner (3) drives the swing arm (4) to rotate and touch the tip of the tool to be measured, and obtains the angle of the tool to be measured; The processor is used to compare the angle of the tool to be measured with the standard tool angle stored in the processor. When the angle of the tool to be measured is less than the difference between the standard tool angle and the angle tolerance, the processor outputs a first signal indicating that the tool to be measured has broken, and the angle tolerance is a preset value; when the angle of the tool to be measured is within a normal angle range, the processor outputs a second signal indicating that the tool to be measured has not broken; the normal angle range is [α0-α, α0+α], where α0 is the standard tool angle and α is the preset angle tolerance.

Images