Automatic drilling system for tire mold and flexible control method of automatic drilling system

Abstract

The invention discloses an automatic drilling system for a tire mold and a flexible control method of the automatic drilling system, and belongs to the technical field of tire mold machining.The automatic drilling system comprises a control system and a linear shaft module, a first motor is installed at one end of the linear shaft module, the output end of the first motor is connected with a lead screw of the linear shaft module, and a sliding block is installed on the lead screw; the sliding block is connected with the main shaft through a connecting plate; the main shaft comprises a second motor, the output end of the second motor is connected with a broach mechanism, and the broach mechanism is connected with a cutter; the first motor and the second motor are connected with the control system and feed torque back to the control system in real time. According to the automatic drilling machine, whole-process automation of the drilling process is achieved, the machining efficiency is guaranteed, meanwhile, through refined process control, real-time monitoring and flexible control strategies, the tool breakage probability is greatly reduced, the tool cost is reduced, product scrapping caused by tool breakage is effectively avoided, and the product yield is remarkably increased.

Description

Technical Field

[0001] The invention relates to the technical field of tire mold processing, and in particular to an automatic drilling system for a tire mold and a flexible control method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Tire molds are molds used for vulcanization molding of various tires. During the tire vulcanization process, in order to discharge the air in the mold cavity, it is necessary to open air holes on the tread of the tire mold; aluminum alloy is the most commonly used material for manufacturing tire molds. The drill bits used for air hole processing have two main characteristics: one is that the drill bit has a small diameter, generally between 1.8 and 2.5 mm; the other is that the drill bit is long, generally between 80 and 150 mm.

[0004] Since the drill bit is thin and long, the tool often breaks due to difficulty in chip removal during drilling, causing the production process to be interrupted; and if the tool breakage is not discovered in time, it may also cause the processed workpiece to be scrapped, adding unnecessary difficulties to subsequent processing and causing unnecessary losses.

[0005] Existing tire mold-specific drilling machines have not optimized the drilling process and cannot reduce the harm caused by broken knives. Moreover, most tire mold manufacturers currently use manual drilling, which is a high-intensity operation accompanied by mechanical vibration and noise pollution. Long-term employment in this position is prone to occupational health risks, including but not limited to hearing loss, musculoskeletal strain, etc. Summary of the invention

[0006] In view of the above problems, the present invention proposes an automatic drilling system for tire molds and a flexible control method thereof, which realizes the full automation of the drilling process. While ensuring the processing efficiency, the probability of tool breakage is greatly reduced through refined process control, real-time monitoring and flexible control strategies, and the tool cost is reduced. The product scrapping caused by prop breakage is effectively avoided, and the product yield rate is significantly improved.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: A first aspect of the present invention provides an automatic drilling system for a tire mold, comprising a control system and a linear axis module, wherein a first motor is mounted at one end of the linear axis module, an output end of the first motor is connected to a lead screw of the linear axis module, a slider is mounted on the lead screw, and the slider is connected to a main shaft through a connecting plate; The spindle includes a second motor, an output end of the second motor is connected to a broaching mechanism, and the broaching mechanism is connected to a tool; The first motor and the second motor are both connected to the control system and provide real-time torque feedback to the control system.

[0008] As a further implementation method, one end of the linear axis module away from the first motor is connected to the drill sleeve bracket, and one end of the drill sleeve bracket away from the linear axis module is provided with a drill sleeve, and the drill sleeve is rotatably connected to the tool.

[0009] As a further implementation method, it also includes an oil pump, which is a quantitative gear pump. The oil pump is connected to the drill sleeve through an oil circuit to provide lubrication for the tool under the control of the control system.

[0010] As a further implementation, the first motor and the second motor are both servo motors, and a cooling circuit is provided on the second motor.

[0011] As a further implementation, the linear axis module further includes a housing, and the first motor and the lead screw are both mounted on the housing of the linear axis module.

[0012] As a further implementation, the lead screw is meshed with the slider, and the lead screw and the slider convert the rotational motion of the output end of the first motor into the linear motion of the slider.

[0013] A second aspect of the present invention provides a flexible control method for an automatic drilling system for a tire mold, based on the automatic drilling system for a tire mold described in the first aspect of the present invention, comprising the following steps: S1. Set drilling parameters; S2, initial drilling stage, the tool drills with the set first drilling parameters; S3, speed-up stage, the tool gradually increases the rotation speed and feed speed to the set maximum rotation speed and maximum feed speed within the set feed distance or feed time; S4, fast drilling stage, the tool is fed at the maximum speed and maximum feed rate for a certain distance or time before executing the tool retraction step; S5, approaching the drilling-through stage, the tool reduces the rotation speed and feed speed to the second drilling parameters and continues drilling; S6, drilling-through stage, after the tool is completely drilled through, the speed is reduced to the third speed, and the feed speed is reduced to 0; S7, exit stage, the tool exits the hole at the third rotation speed and exit feed rate.

[0014] As a further implementation, in the step of retracting the tool, the tool retracts to a fixed position or a fixed distance at a fourth rotation speed and a fourth feed speed, and then returns to the original step to continue drilling.

[0015] As a further implementation method, the method further includes detecting the torque of the first motor and the torque of the second motor in real time, and executing a tool retracting step when the torques of the first motor and the second motor meet certain conditions.

[0016] As a further implementation, there are two speed-up methods, namely increasing the rotation speed and the feeding speed within a certain feeding distance, and increasing the rotation speed and the feeding speed within a certain feeding time.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The automatic drilling system for tire molds and the flexible control method thereof of the present invention, through refined process control, real-time monitoring and flexible strategies, greatly reduce the probability of tool breakage and tool costs in automated processing while ensuring processing efficiency, effectively avoid product scrapping due to tool breakage, and significantly improve product yield, thereby providing a high-reliability, low-cost automation solution for the tire mold manufacturing field.

[0018] The automatic drilling system for tire molds and the flexible control method thereof of the present invention provide two speed-up modes and two tool retraction modes, and can flexibly select parameter combinations according to material properties, tool status and processing requirements, thereby enhancing the system's adaptability to different working conditions, and are particularly suitable for high-precision small hole processing scenarios of aluminum alloy tire molds.

[0019] The automatic drilling system for tire molds and the flexible control method thereof of the present invention adopt a servo motor, a high-speed spindle and an integrated control system (such as a PLC or an FPGA) to realize the full automation of the drilling process without manual intervention, thereby solving the problems of high labor intensity and low efficiency of manual drilling, and significantly reducing the occupational health risks of operators (such as noise exposure and muscle strain). BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] Figure 1 It is a structural schematic diagram of the automatic drilling system for tire molds of the present invention; Figure 2 It is a structural schematic diagram of a linear axis module of an automatic drilling system for a tire mold of the present invention; Figure 3 It is a structural schematic diagram of the main shaft of the automatic drilling system for tire molds of the present invention; Figure 4 The figure is a flow chart of the flexible control method of the automatic drilling system for tire molds of the present invention.

[0022] In the figure: 1. first motor; 2. linear axis module; 21. housing; 22. screw rod; 23. slide block; 3. connecting plate; 4. spindle; 41. second motor; 42. cooling circuit; 43. broaching mechanism; 5. tool; 6. drill sleeve bracket; 7. drill sleeve; 8. oil pump; 9. control system. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0025] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0026] Embodiment 1 like Figure 1-3 As shown, this embodiment provides an automatic drilling system for tire molds, including a control system 9 and a linear axis module 2, one end of the linear axis module 2 is equipped with a first motor 1 (linear axis drive motor 1), the output end of the first motor 1 is connected to the screw 22 of the linear axis module 2, the screw 22 is equipped with a slider 23, and the slider 23 is connected to the spindle 4 through a connecting plate 3; the spindle 4 includes a second motor 41 (spindle motor 41), the output end of the second motor 41 is connected to the broaching mechanism 43, and the broaching mechanism 43 is connected to the tool 5; the first motor 1 and the second motor 41 are both connected to the control system 9, and the torque is fed back to the control system 9 in real time. In this embodiment, the tool 5 is a drill bit.

[0027] One end of the linear axis module 2 away from the first motor 1 is connected to the drill sleeve bracket 6 . One end of the drill sleeve bracket 6 away from the linear axis module 2 is provided with a drill sleeve 7 , and the drill sleeve 7 is rotatably connected to the tool 5 .

[0028] It also includes an oil pump 8 , which is a quantitative gear pump. The oil pump 8 is connected to the drill sleeve 7 through an oil circuit and provides lubrication for the tool 5 under the control of a control system 9 .

[0029] The first motor 1 and the second motor 41 are both servo motors, one of which is to drive the linear axis module 2 and the main shaft 4 to perform linear feeding, and the other is to provide real-time torque feedback. A cooling circuit 42 is provided on the second motor 41 .

[0030] like Figure 2 As shown, the linear axis module 2 includes a housing 21 , a lead screw 22 and a slider 23 , and the first motor 1 and the lead screw 22 are both mounted on the housing 21 of the linear axis module 2 .

[0031] like Figure 3 As shown, the spindle 4 includes a second motor 41, a cooling circuit 42 and a broaching mechanism 43. The second motor 41 is a high-speed servo motor that drives the tool to rotate and provides real-time torque feedback. The cooling circuit 42 is used to cool the second motor 41. The broaching mechanism 43 transmits the torque generated by the second motor 41 to the tool 5 and is used to clamp and release the tool 5.

[0032] The lead screw 22 is meshed with the slider 23 , and the lead screw 22 and the slider 23 convert the rotational motion of the output end of the first motor 1 into the linear motion of the slider 23 .

[0033] The control system 9 is a single chip microcomputer, a motion control card, a PLC or an FPGA, and is used to control the first motor 1, the second motor 41, the spindle 4 and the oil pump 8, and detect the torque of the feed shaft and the spindle motor in real time.

[0034] Embodiment 2 like Figure 4 As shown, this embodiment provides a flexible control method for an automatic drilling system for a tire mold. Based on the automatic drilling system for a tire mold in Embodiment 1, the method includes the following steps: S1. Set drilling parameters; S2, initial drilling stage, the tool drills with the set first drilling parameters; S3, speed-up stage, the tool gradually increases the rotation speed and feed speed to the set maximum rotation speed and maximum feed speed within the set feed distance or feed time; S4, fast drilling stage, the tool is fed at the maximum speed and maximum feed rate for a certain distance or time before executing the tool retraction step; S5, approaching the drilling-through stage, the tool reduces the rotation speed and feed speed to the second drilling parameters and continues drilling; S6, drilling-through stage, after the tool is completely drilled through, the speed is reduced to the third speed, and the feed speed is reduced to 0; S7, exit stage, the tool exits the hole at the third rotation speed and exit feed rate.

[0035] The flexible control method of the automatic drilling system of the present invention includes the following 8 steps and 1 detection mechanism, which are as follows: S1. Set drilling parameters, including rotation speed, feed speed, feed distance or feed time, and maximum torque.

[0036] S2, initial drilling stage, the drill bit rotates at a speed of and feed speed Feed distance.

[0037] S3, speed-up stage, the drill bit is in the feed distance or time Gradually increase the speed and feed rate to the set maximum speed and maximum feed speed .

[0038] S4, fast drilling stage, the drill bit runs at maximum speed and maximum feed speed Feed distance or feed time Then execute step S8.

[0039] S5, approaching the drilling stage, the drill bit reduces the speed and feed rate to and Continue drilling.

[0040] S6, drilling through stage, after the drill bit is completely drilled through, the speed is reduced to The feed rate is reduced to 0.

[0041] S7, exit stage, the drill bit rotates at a speed of and feed speed Exit the hole.

[0042] S8, the drill bit rotates at a speed of and feed speed Back to fixed position or fixed distance distance, and then return to the original step.

[0043] C1, detection mechanism, effective in steps S2~S6, real-time detection of the linear axis drive motor torque and the torque of the spindle ,when or , execute step S8 once.

[0044] In the above step S1, the rotation speed includes , , , , The feed speeds are respectively the initial drilling stage, the fast drilling stage, the near-through drilling stage, the through drilling stage, and the backing stage. , , , , The feed speeds are respectively the initial drilling stage, the fast drilling stage, the nearly through drilling stage, the withdrawal stage, and the retraction stage; the feed distance includes , , , are the feed distances of the speed-up stage, the fast drilling stage, and the tool retraction stage, respectively. The feed time includes , are the feed times of the speed-up stage and the fast drilling stage respectively; the maximum torque includes , They are the maximum torque of the linear axis drive motor and the maximum torque of the spindle servo motor respectively.

[0045] The parameters in the above step S1 are set according to the operator's experience.

[0046] In the above step S2, the drill bit is a parabolic deep hole drill bit, the drill bit diameter is 1.8mm~2.5mm, and the drill bit length is 80~150mm; The value is 3~5mm, and it should be adjusted appropriately according to the length of the drill bit.

[0047] In the above step S3, there are two options for the speed-up method: one is to increase the feed distance Increase the rotation speed and feed rate, the feed rate increase rate is: , the speed increase rate is ; Second, in time The rotation speed and feed speed are increased internally, and the feed speed increase rate is: The speed increase rate is .

[0048] In the above step S4, the feeding distance The maximum feed distance is 5~10mm to prevent chip blockage and tool breakage caused by excessive single feed distance.

[0049] In the above step S5, when the drill bit is 3-5 mm away from drilling through, it is considered to have entered the near-drilling through stage, and the speed is and feed speed .

[0050] In the above step S8, the speed and feed speed Below the stated maximum speed and maximum feed speed , (to avoid excessive cutting of the drill bit and damage to the hole); there are two options for the retraction method: one is to retract the drill to a fixed position each time , and secondly, retreat a fixed distance according to the current drill position .

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0052] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. An automatic drilling system for a tire mold, characterized in that: It includes a control system and a linear axis module, a first motor is installed at one end of the linear axis module, an output end of the first motor is connected to a lead screw of the linear axis module, a slider is installed on the lead screw, and the slider is connected to the main shaft through a connecting plate; The spindle includes a second motor, an output end of the second motor is connected to a broaching mechanism, and the broaching mechanism is connected to a tool; The first motor and the second motor are both connected to a control system and provide real-time torque feedback to the control system.

2. An automatic drilling system for a tire mold as claimed in claim 1, characterized in that: One end of the linear axis module away from the first motor is connected to the drill sleeve bracket, and one end of the drill sleeve bracket away from the linear axis module is provided with a drill sleeve, and the drill sleeve is rotatably connected to the tool.

3. An automatic drilling system for a tire mold as claimed in claim 2, characterized in that: It also includes an oil pump, which is a quantitative gear pump. The oil pump is connected to the drill sleeve through an oil circuit and provides lubrication for the tool under the control of a control system.

4. The automatic drilling system for tire mold according to claim 1, characterized in that: The first motor and the second motor are both servo motors, and the second motor is provided with a cooling circuit.

5. The automatic drilling system for tire mold according to claim 1, characterized in that: The linear axis module also includes a housing, and the first motor and the lead screw are both mounted on the housing of the linear axis module.

6. The automatic drilling system for tire mold according to claim 1, characterized in that: The lead screw is meshed with the slider, and the lead screw and the slider convert the rotational motion of the output end of the first motor into the linear motion of the slider.

7. A flexible control method for an automatic drilling system of a tire mold, characterized in that: An automatic drilling system for a tire mold according to any one of claims 1 to 6 comprises the following steps: S1. Set drilling parameters; S2, initial drilling stage, the tool drills with the set first drilling parameters; S3, speed-up stage, the tool gradually increases the rotation speed and feed speed to the set maximum rotation speed and maximum feed speed within the set feed distance or feed time; S4, fast drilling stage, the tool is fed at the maximum speed and maximum feed rate for a certain distance or time before executing the tool retraction step; S5, approaching the drilling-through stage, the tool reduces the rotation speed and feed speed to the second drilling parameters and continues drilling; S6, drilling-through stage, after the tool is completely drilled through, the speed is reduced to the third speed, and the feed speed is reduced to 0; S7, exit stage, the tool exits the hole at the third rotation speed and exit feed rate.

8. A flexible control method for an automatic drilling system for a tire mold as claimed in claim 7, characterized in that: The tool retracting step is as follows: the tool retracts to a fixed position or a fixed distance at a fourth rotation speed and a fourth feed speed, and then returns to the original step to continue drilling.

9. A flexible control method for an automatic drilling system for a tire mold as claimed in claim 7, characterized in that: The method also includes detecting the torque of the first motor and the torque of the second motor in real time, and executing a tool retracting step when the torques of the first motor and the second motor meet certain conditions.

10. The flexible control method for an automatic drilling system for a tire mold according to claim 7, characterized in that: There are two speed-up methods, namely increasing the rotation speed and the feeding speed within a certain feeding distance, and increasing the rotation speed and the feeding speed within a certain feeding time.

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