Automatic punching device for tire mold

Abstract

The invention provides an automatic punching device for a tire mold. A supporting plate is fixedly mounted at the top of a rack; the automatic punching mechanism is fixedly mounted on one side of the top of the supporting plate; the automatic punching mechanism comprises a vertical support and a lead screw module. A vertically-arranged lead screw module is fixedly installed on one side of the vertical support, and an automatic punching machine is fixedly connected to one side of a sliding block of the lead screw module. The two sides of the front side of the vertical support are fixedly connected with sliding rails correspondingly. The heating mechanism is arranged on one side of the automatic punching mechanism, and the cutter driven by the automatic punching machine is controlled to be actively inserted into the end part of the heat transfer pipeline for heating, so that the heating airflow directly and intensively acts on the cutter under the converging action of the conical closed hole, and the directional, local and controlled heating of the cutter is realized; the problems of heat dispersion and low heating efficiency in a traditional external heating mode are solved, the cutting stability of the cutter in the high-strength die material punching process is improved, and the service life of the cutter in the high-strength die material punching process is prolonged.

Description

Technical Field

[0001] This invention relates to the field of tire mold processing technology, and in particular to an automatic punching device for tire molds. Background Technology

[0002] As a key tool in the tire forming process, the structural precision and surface finish of tire molds directly affect the venting performance, forming quality, and service life of tire products. During the manufacturing and subsequent maintenance of tire molds, it is usually necessary to process a large number of densely distributed venting holes on the mold surface to ensure that the gas in the mold cavity can be discharged in time during vulcanization, avoiding quality defects such as air bubbles, air trapping, or insufficient rubber in tire products. Therefore, the drilling process of tire molds is one of the key processes with high requirements for processing precision and consistency. Existing tire mold drilling methods mostly use mechanical drilling or automated drilling equipment. During the drilling process, there will be a lot of friction and cutting resistance between the tool and the mold material. Especially when the mold material is pre-hardened steel or high-strength alloy steel, the drilling area is prone to high temperature in a short period of time. The above-mentioned local temperature rise will not only aggravate tool wear, but may also cause local thermal expansion of the mold, thereby affecting the accuracy of hole dimensions and hole wall processing quality. In actual production, cutting fluid or coolant is usually used to cool the tool or mold to reduce the heat generated during the cutting process. However, this method has certain limitations in the application of tire mold drilling. For example, the cooling effect is difficult to concentrate on the specific drilling area, the cooling effect is greatly affected by the working conditions, and it is difficult to maintain a stable and consistent cooling effect when machining multiple holes continuously. At the same time, the cutting fluid residue on the mold surface often requires an additional cleaning process, which is not conducive to improving the overall processing efficiency. Therefore, an automatic punching device for tire molds is proposed. Summary of the Invention

[0003] In view of this, the present invention provides an automatic punching device for tire molds to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial alternative.

[0004] The technical solution of the present invention is implemented as follows: an automatic punching device for tire molds, comprising a frame, wherein a support plate is fixedly installed on the top of the frame; An automatic drilling mechanism is fixedly installed on one side of the top of the support plate; The automatic punching mechanism includes a vertical support and a lead screw module; A vertically arranged lead screw module is fixedly installed on one side of the vertical support, and an automatic punching machine is fixedly connected to one side of the sliding block of the lead screw module; The two sides of the front of the vertical support are respectively fixedly connected to slide rails, which are used to guide the vertical movement of the automatic punching machine. A temperature sensor is fixedly installed on one side of the bottom of the sliding block of the lead screw module, and the temperature sensor is located on the side of the cutting tool of the automatic drilling machine. The other end of the heat transfer pipe is arranged vertically to the cutting tool of the automatic drilling machine; The workpiece adjustment mechanism is fixedly installed on the other side of the top of the support plate and is correspondingly set with the automatic drilling mechanism; The workpiece adjustment mechanism includes a groove shell, which is mounted on a support plate; A linear cylinder is fixedly connected to the inner wall of the tank shell, and a fixing plate is fixedly connected to the output end of the linear cylinder. A top support plate is fixedly connected to the top of the fixed plate, and a rotary cylinder is fixedly connected to the top of the top support plate. Guide rails are fixedly connected to both sides of the inner bottom wall of the tank shell, and guide sliders are slidably connected to the two guide rails respectively. The two sides of the fixed plate are fixedly connected to the two guide sliders respectively. A liquid nitrogen cooling mechanism is located on the upper part of the workpiece adjustment mechanism; The liquid nitrogen cooling mechanism includes a gantry, the bottom of which is fixedly connected to the support plate. A drive cylinder is mounted on the gantry, and a support block is fixedly connected to the output end of the drive cylinder. A side bracket is fixedly connected to one side of the support block, a side support plate is fixedly connected to the side bracket, and a trapezoidal cooling cover is fixedly connected to one side of the side support plate. The other end of the second nitrogen delivery hose is configured with two branch pipes, and the two branch pipes are respectively fixedly connected to the top of the trapezoidal cooling shield; A liquid nitrogen delivery mechanism and a heating mechanism are respectively disposed on both sides of the automatic drilling mechanism, wherein the liquid nitrogen delivery mechanism is connected to the liquid nitrogen cooling mechanism to supply liquid nitrogen thereto, and the heating mechanism is used to provide heat to the cutting tool area of ​​the automatic drilling mechanism.

[0005] The liquid nitrogen delivery mechanism includes a liquid nitrogen tank, and a nitrogen delivery pipe is fixedly connected to the bottom of the liquid nitrogen tank; One end of the nitrogen delivery pipe is provided with an injection head, and the other end of the nitrogen delivery pipe is fixedly connected to a nitrogen delivery hose. A cold temperature gauge is provided at the connection between the nitrogen delivery pipe and the nitrogen delivery hose. The delivery pump is fixedly installed on the support plate. The input end of the delivery pump is fixedly connected to one end of the first nitrogen delivery hose, and the output end of the delivery pump is fixedly connected to the second nitrogen delivery hose. Valves are provided at the connection points between the first nitrogen delivery hose and the delivery pump, and at the connection points between the delivery pump and the second nitrogen delivery hose; The liquid nitrogen tank is provided with two fixing clamps on the outside, and a fixing frame is fixedly installed on one side of the support plate. The liquid nitrogen tank is fixedly connected to the fixing frame by the two fixing clamps.

[0006] The heating mechanism includes a blower, a heater, a heat transfer pipe, and a positioning plate; Both the blower and the heater are fixedly mounted on the support plate, and the output end of the blower is fixedly connected to the input end of the heater. One end of the heat transfer pipe is fixedly connected to the output end of the heater, and the other end of the heat transfer pipe extends to the automatic drilling mechanism and is set corresponding to the cutting tool area; The positioning plate is fixedly installed on the support plate and is used to position and support the heat transfer pipeline.

[0007] More preferably, a control box is installed on one side of the mounting bracket.

[0008] The embodiments of the present invention have the following advantages due to the adoption of the above technical solutions: I. This invention provides a heating mechanism on one side of the automatic drilling mechanism and controls the cutting tool driven by the automatic drilling machine to actively insert into the end of the heat transfer pipe for heating. The heating airflow is directly concentrated on the cutting tool body under the converging effect of the conical closed hole, thereby achieving directional, localized and controlled heating of the cutting tool. This avoids the problems of heat dispersion and low heating efficiency in traditional external heating methods, and improves the cutting stability and service life of the cutting tool in the drilling process of high-strength mold materials.

[0009] Second, this invention sets up a liquid nitrogen cooling mechanism above the workpiece adjustment mechanism, and continuously supplies liquid nitrogen to the trapezoidal cooling shield by a liquid nitrogen delivery mechanism, so that the liquid nitrogen only forms a local low temperature environment in the current drilling area, rather than cooling the mold as a whole. This effectively suppresses the heat accumulation in the drilling area, avoids the additional thermal stress introduced by the sudden drop in the overall temperature of the mold, and improves the stability of the mold structure.

[0010] Third, this invention uses a driving cylinder to drive a trapezoidal cooling shield to adjust its position synchronously with the hole to be processed, so that the cooling area always corresponds to the current drilling position, achieving dynamic matching between cooling effect and hole position change, thereby solving the problem that existing cooling methods cannot take into account the consistency of continuous processing of multiple holes.

[0011] Fourth, this invention achieves a stable temperature gradient between the tool side and the mold side during the drilling process by synergistically combining directional heating of the cutting tool and local cooling of the mold. This allows the cutting heat to be mainly concentrated and consumed on the tool side, rather than easily diffused into the mold. As a result, while ensuring drilling efficiency, it reduces the risk of thermal deformation of the tire mold during continuous drilling operations and improves the accuracy of hole dimensions and the surface quality of the hole wall.

[0012] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a structural diagram of the present invention from one perspective; Figure 2 This is a structural diagram from another perspective of the present invention; Figure 3 This is a structural diagram showing the location of the liquid nitrogen delivery mechanism and the liquid nitrogen cooling mechanism of the present invention; Figure 4 This is a structural diagram of the liquid nitrogen delivery mechanism of the present invention; Figure 5 This is a structural view of the workpiece adjustment mechanism of the present invention. Figure 6 This is another structural view of the workpiece adjustment mechanism of the present invention.

[0015] Figure Descriptions: 111. Frame; 112. Support Plate; 113. Control Box; 10. Automatic Drilling Mechanism; 11. Vertical Support; 12. Lead Screw Module; 13. Slide Rail; 14. Automatic Drilling Machine; 15. Temperature Sensor; 20. Liquid Nitrogen Delivery Mechanism; 211. Fixing Clamp; 21. Fixing Frame; 22. Liquid Nitrogen Tank; 23. Nitrogen Delivery Pipe; 24. Injection Pipe Head; 25. Cold Temperature Gauge; 26. Nitrogen Delivery Hose 1; 27. Delivery Pump; 28. Valve; 29. Nitrogen delivery hose 2; 30. Workpiece adjustment mechanism; 31. Tank shell; 32. Linear cylinder; 33. Fixing plate; 34. Guide rail; 35. Guide block; 36. Top support plate; 37. Rotary cylinder; 40. Liquid nitrogen cooling mechanism; 41. Gantry; 42. Drive cylinder; 43. Support block; 44. Side bracket; 45. Side support plate; 46. Trapezoidal cooling cover; 50. Heating mechanism; 51. Blower; 52. Heater; 53. Heat transfer pipe; 54. Positioning plate. Detailed Implementation

[0016] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0017] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0018] like Figure 1-6 As shown, this embodiment of the invention provides an automatic punching device for tire molds, including a frame 111. The frame 111 provides a support and installation foundation for the entire device. A support plate 112 is fixedly installed on the top of the frame 111. The support plate 112 serves as an installation platform for each functional mechanism, ensuring the relative positional stability between the mechanisms and the overall structural strength.

[0019] An automatic drilling mechanism 10 is fixedly installed on one side of the top of the support plate 112. The automatic drilling mechanism 10 includes a vertical bracket 11 and a lead screw module 12.

[0020] The vertical support 11 is vertically mounted on the support plate 112, and a vertically mounted lead screw module 12 is fixedly installed on one side of it. An automatic punching machine 14 is fixedly connected to one side of the sliding block of the lead screw module 12. The automatic punching machine 14 is used to install punching tools and moves in the vertical direction for feeding or retracting under the drive of the lead screw module 12, so as to realize the automatic punching operation of the tire mold.

[0021] The front sides of the vertical support 11 are fixedly connected with slide rails 13. The two slide rails 13 are correspondingly set with the automatic punching machine 14 to guide and limit the vertical movement of the automatic punching machine 14, thereby improving the stability and positioning accuracy during the punching process and avoiding shaking or deviation during the punching process.

[0022] A temperature sensor 15 is fixedly installed on one side of the bottom of the sliding block of the lead screw module 12. The temperature sensor 15 is located on the side of the tool of the automatic punching machine 14 and is used to monitor the temperature near the tool in real time during the punching process so as to grasp the heating status of the tool and avoid the punching quality or equipment safety due to abnormal temperature.

[0023] A workpiece adjustment mechanism 30 is fixedly installed on the other side of the top of the support plate 112. The workpiece adjustment mechanism 30 is set in correspondence with the automatic punching mechanism 10 and is used to adjust the position and posture of the tire mold.

[0024] The workpiece adjustment mechanism 30 includes a groove shell 31, which is fixedly installed on the support plate 112 and is used to limit and protect the internal adjustment components. A linear cylinder 32 is fixedly connected to the inner side wall of the groove shell 31, and a fixed plate 33 is fixedly connected to the output end of the linear cylinder 32. Through the extension and retraction of the linear cylinder 32, the fixed plate 33 can be driven to move horizontally in the groove shell 31, thereby realizing the front and rear position adjustment of the tire mold.

[0025] A top support plate 36 is fixedly connected to the top of the fixed plate 33. The top support plate 36 is used to support the tire mold. A rotary cylinder 37 is fixedly connected to the top of the top support plate 36. The rotary cylinder 37 is used to drive the top support plate 36 and the tire mold it supports to rotate and adjust the angle to meet the drilling requirements of different hole positions.

[0026] Guide rails 34 are fixedly connected to both sides of the inner bottom wall of the tank shell 31, and guide sliders 35 are slidably connected to the two guide rails 34 respectively. The two sides of the fixed plate 33 are fixedly connected to the two guide sliders 35 respectively. Through the cooperation of the guide rails 34 and the guide sliders 35, the movement of the fixed plate 33 is guided and supported, thereby ensuring the stability and repeatability of the workpiece adjustment process.

[0027] A liquid nitrogen cooling mechanism 40 is provided on the upper part of the workpiece adjustment mechanism 30 to cool the tire mold during the drilling process and reduce the risk of thermal deformation of the mold due to heat.

[0028] The liquid nitrogen cooling mechanism 40 includes a gantry 41, the bottom of which is fixedly connected to a support plate 112. A drive cylinder 42 is mounted on the gantry 41, and a support block 43 is fixedly connected to the output end of the drive cylinder 42. The support block 43 can be moved vertically by the action of the drive cylinder 42.

[0029] A side bracket 44 is fixedly connected to one side of the support block 43, a side support plate 45 is fixedly connected to the side bracket 44, and a trapezoidal cooling cover 46 is fixedly connected to one side of the side support plate 45. The tire mold is moved to the bottom of the trapezoidal cooling cover 46 by the workpiece adjustment mechanism 30 and is set to correspond to the drilling area of ​​the automatic drilling mechanism 10, so as to form a local cooling space in the drilling area.

[0030] The other end of the nitrogen delivery hose 29 is configured with two branch pipes, which are fixedly connected to the top of the trapezoidal cooling shield 46, so that liquid nitrogen can be distributed downward from the top of the trapezoidal cooling shield 46 to uniformly cool the surface of the tire mold and the perforated area.

[0031] A liquid nitrogen delivery mechanism 20 is provided on one side of the automatic punching mechanism 10. The liquid nitrogen delivery mechanism 20 is connected to the liquid nitrogen cooling mechanism 40 and is used to supply liquid nitrogen to it.

[0032] The liquid nitrogen delivery mechanism 20 includes a liquid nitrogen tank 22, which is used to store liquid nitrogen gas. A nitrogen delivery pipe 23 is fixedly connected to the bottom of the liquid nitrogen tank 22, and an injection head 24 is provided at one end of the nitrogen delivery pipe 23 to facilitate the replenishment and injection of liquid nitrogen.

[0033] The other end of the nitrogen delivery pipe 23 is fixedly connected to a nitrogen delivery hose 26, and a cold temperature gauge 25 is installed at the connection between the nitrogen delivery pipe 23 and the nitrogen delivery hose 26 to monitor the temperature status during the liquid nitrogen delivery process.

[0034] The delivery pump 27 is fixedly installed on the support plate 112. The input end of the delivery pump 27 is fixedly connected to one end of the nitrogen delivery hose 26, and the output end is fixedly connected to the nitrogen delivery hose 29, which is used to pressurize and deliver liquid nitrogen to the liquid nitrogen cooling mechanism 40.

[0035] Valves 28 are installed at the connection between nitrogen delivery hose 26 and delivery pump 27, and at the connection between delivery pump 27 and nitrogen delivery hose 29, to control the start and stop of liquid nitrogen and regulate the flow rate.

[0036] The liquid nitrogen tank 22 is provided with two fixing clamps 211 on the outside, and a fixing frame 21 is fixedly installed on one side of the support plate 112. The liquid nitrogen tank 22 is fixedly connected to the fixing frame 21 by the two fixing clamps 211, thereby improving the stability of the liquid nitrogen tank 22 during operation.

[0037] A heating mechanism 50 is provided on the other side of the automatic punching mechanism 10. The heating mechanism 50 is used to provide heat to the tool area of ​​the automatic punching mechanism 10 to improve the punching state of the tool.

[0038] The heating mechanism 50 includes a blower 51, a heater 52, a heat transfer pipe 53, and a positioning plate 54. The blower 51 and the heater 52 are both fixedly installed on the support plate 112. The output end of the blower 51 is fixedly connected to the input end of the heater 52 to send air into the heater 52 for heating.

[0039] One end of the heat transfer pipe 53 is fixedly connected to the output end of the heater 52, and the other end extends to the automatic punching mechanism 10 and is set in accordance with the tool area. By controlling the tool of the automatic punching mechanism 10 to be inserted into the inside of one end of the heat transfer pipe 53, and a conical closed hole is set inside the one end of the heat transfer pipe 53, the tool can only be inserted into it for heating, so that the heated airflow can directly act on the tool. The other end of the heat transfer pipe 53 is arranged vertically with the tool of the automatic punching machine 14, thereby improving the targeting of the tool heating.

[0040] The positioning plate 54 is fixedly installed on the support plate 112 to position and support the heat transfer pipe 53 and prevent the heat transfer pipe 53 from shifting during long-term operation.

[0041] More preferably, a control box 113 is installed on one side of the fixed frame 21. The control box 113 is used to centrally control and set parameters for the automatic drilling mechanism 10, the workpiece adjustment mechanism 30, the liquid nitrogen conveying mechanism 20, the liquid nitrogen cooling mechanism 40, and the heating mechanism 50, so as to improve the overall automation level and ease of operation of the device. The control box 113 integrates the following conventional industrial control units: The main control unit can be a programmable logic controller (PLC) or an equivalent industrial control module, used to receive various operation instructions and output corresponding execution signals according to preset control logic.

[0042] It includes a power module, circuit breaker, relays and overload protection components, which are used to provide a stable power supply for electrical components such as automatic punching machine 14, lead screw module 12, linear cylinder 32, rotary cylinder 37, drive cylinder 42, delivery pump 27, blower 51, heater 52 and so on, and to provide power outage protection in abnormal situations.

[0043] The signal acquisition and output module is used to receive temperature signals from temperature sensor 15 and output control signals to each actuator to realize basic state judgment and action control. This part belongs to the prior art known in the field and will not be described in detail here.

[0044] In this embodiment, the temperature sensor 15 is used to collect temperature information near the tool of the automatic punching machine 14. A domestic industrial temperature sensor, such as a K-type thermocouple temperature sensor, can be selected. The transfer pump 27 is used to stably transfer liquid nitrogen from the liquid nitrogen tank 22 to the trapezoidal cooling shield 46. The LD series cryogenic pump for cryogenic media can be selected. The blower 51 can be a high-temperature heat-resistant blower (such as the HTB4-72 series) or a similar industrial centrifugal blower to provide airflow for the heater 52; Heater 52 can be an industrial electric heater (such as LHX-5KW or LHX-10KW type) to heat the air and then deliver it to the tool heating area; The drive cylinder 42 can be a domestic standard cylinder (such as Airtac CDQ2B50-50) or an equivalent SMC model to achieve position adjustment of the trapezoidal cooling shield 46; The rotary cylinder 37 can be a rack and pinion type or a vane type rotary cylinder, such as the Airtac CRB2BW series, SMCCRB2BW series or Festo DRQD series, etc., to realize the angle rotation adjustment of the top support plate 36 and the tire mold.

[0045] In this embodiment, the tool heating temperature and the mold cooling temperature are both preset and adjusted by the control box 113. The tool heating temperature can be set in the range of 150℃ to 400℃ according to the tool material and mold hardness. The local ambient temperature formed by liquid nitrogen cooling can be maintained in the range of -50℃ to -30℃. The specific values ​​can be adjusted by the operator according to the actual processing needs.

[0046] In operation, this invention achieves automated drilling of tire molds under controlled hot and cold conditions through the coordinated work of the automatic drilling mechanism 10, the workpiece adjustment mechanism 30, the liquid nitrogen cooling mechanism 40, the liquid nitrogen conveying mechanism 20, and the heating mechanism 50. Its operating principle is as follows: After the equipment is started, the control box 113 controls each execution unit in a unified manner, so that the lead screw module 12 drives the automatic punching machine 14 to the upper standby state, the linear cylinder 32 and the rotary cylinder 37 are in the initial state, and the liquid nitrogen delivery mechanism 20 and the heating mechanism 50 are temporarily not working.

[0047] The tire mold is placed on the top support plate 36 by manual labor or other feeding devices to complete the initial loading.

[0048] Before drilling, the linear cylinder 32 is controlled to run. The output action of the linear cylinder 32 drives the fixed plate 33 to move in a predetermined direction, thereby causing the tire mold supported by the top support plate 36 to move in the horizontal direction, so as to achieve the initial alignment of the target hole with the automatic drilling machine 14.

[0049] Subsequently, the rotary cylinder 37 is controlled to operate, and the rotary cylinder 37 outputs a rotation action, which drives the top support plate 36 and the tire mold to rotate synchronously, so that the orientation of the hole to be processed is consistent with the feed direction of the automatic drilling machine 14, thereby meeting the drilling requirements of different hole orientations.

[0050] With the coordinated operation of linear cylinder 32 and rotary cylinder 37, the tire mold completes the spatial posture adjustment before drilling.

[0051] After the tire mold is positioned and the holes to be processed are confirmed to correspond with the automatic drilling mechanism 10, the liquid nitrogen delivery mechanism 20 enters the working state.

[0052] Liquid nitrogen is released from liquid nitrogen tank 22 and enters nitrogen delivery pipe 23 under its own low temperature and pressure conditions. It is then transported to delivery pump 27 via nitrogen delivery hose 1 26. After delivery pump 27 is started, it delivers liquid nitrogen in a quantitative manner, so that liquid nitrogen enters nitrogen delivery hose 29 at a stable flow rate and is continuously delivered to the trapezoidal cooling shield 46 corresponding to liquid nitrogen cooling mechanism 40.

[0053] After the liquid nitrogen reaches the top of the trapezoidal cooling shield 46, it is released downward through the diversion channel inside the shield. During the release process, the liquid nitrogen quickly absorbs heat from the surrounding environment, forming a stable local low-temperature cooling environment within the space covered by the trapezoidal cooling shield 46, which causes the temperature of the tire mold surface and the area to be drilled to drop rapidly.

[0054] Because the trapezoidal cooling shield 46 covers and guides the cooling area, liquid nitrogen cooling mainly focuses on the area near the hole to be processed, without causing excessive cooling in other areas of the mold, thus avoiding the additional thermal stress problem caused by the sudden drop in the overall temperature of the mold.

[0055] During the subsequent punching process, when the tool of the automatic punching machine 14 comes into contact with the tire mold and generates friction and cutting heat, the liquid nitrogen cooling mechanism 40 continuously provides a low-temperature environment around the punching area, so that the heat generated during the cutting process can be carried away in time, suppressing the accumulation of heat inside the tire mold and reducing the risk of thermal expansion and thermal deformation of the tire mold in local areas.

[0056] When different holes need to be processed, the drive cylinder 42 enters the operating state according to the height change of the hole to be processed. The output action of the drive cylinder 42 drives the trapezoidal cooling cover 46 to move up and down in the vertical direction, so that the trapezoidal cooling cover 46 is always above the current hole to be processed, thereby ensuring that the liquid nitrogen cooling effect always corresponds to the area where drilling is being performed.

[0057] By adjusting the position of the trapezoidal cooling shield 46 through the drive cylinder 42, the liquid nitrogen cooling mechanism 40 maintains targeted cooling of the target hole throughout the entire drilling process, avoiding displacement of the cooling area or attenuation of the cooling effect, thereby improving the temperature stability and processing consistency of the tire mold in continuous drilling operations. While the liquid nitrogen cooling mechanism 40 cools the tire mold, the heating mechanism 50 is activated.

[0058] The blower 51 operates, continuously sending air into the heater 52 for heating. The heated high-temperature airflow is then discharged through the heat transfer pipe 53 and guided to the cutting tool area of ​​the automatic punching machine 14.

[0059] When the punching tool is heated, the heating mechanism 50 enters the operating state: the blower 51 starts and continuously blows air, the heater 52 heats the incoming airflow, and the high-temperature airflow is then transported along the heat transfer pipe 53 to its end heating area. At this time, the automatic punching mechanism 10 enters the "heating position" operation process, and the lead screw module 12 drives the automatic punching machine 14 to make a vertical feed movement, so that the end of the tool driven by the automatic punching machine 14 gradually extends into one end of the heat transfer pipe 53.

[0060] When the tip of the cutter extends into the heat transfer pipe 53, the tapered sealing hole inside the end of the heat transfer pipe 53 serves to "guide, limit, and retract" the cutter. Firstly, the conical structure allows the cutting tool to be naturally centered during insertion, reducing the probability of uneven wear or scraping between the cutting tool and the inner wall of the heat transfer pipe 53. Secondly, the conical closed hole forms a contraction channel on the outer periphery of the tool, which forces the high-temperature airflow in the heat transfer pipe 53 to concentrate in the circumferential direction of the tool in the end area, thereby reducing the ineffective dissipation of hot air at the end. Third, the tapered closed hole provides a formative constraint on the tool insertion depth, ensuring that the tool tip is stably within the effective heating range of the concentrated high-temperature airflow, thus avoiding unstable tool temperature rise caused by fluctuations in heating distance.

[0061] During the insertion and stable placement of the cutting tool inside the end of the heat transfer pipe 53, the high-temperature airflow continues to flow along the direction of the heat transfer pipe 53. Under the converging effect of the conical closed hole, it generates a stronger convective heat transfer effect on the tool surface, causing the tool temperature to rise rapidly and then stabilize. Since the heating area at the end of the heat transfer pipe 53 is vertically aligned with the tool axis of the automatic drilling machine 14, the high-temperature airflow can form a relatively stable direction of action and coverage area near the tool, making the tool more concentrated and targeted in heating. This improves the cutting condition of the tool and enhances the hole wall machining quality in subsequent drilling processes.

[0062] During the heating process, the temperature sensor 15 continuously collects temperature information near the tool and feeds the temperature signal back to the control box 113 to determine whether the current tool temperature meets the drilling requirements.

[0063] When the temperature sensor 15 detects that the tool temperature has reached the set value and the liquid nitrogen cooling mechanism 40 has formed a stable cooling environment in the tire mold drilling area, the automatic drilling operation is started.

[0064] Move the trapezoidal cooling shield 46 to the area above the automatic drilling machine 14 to ensure that it does not affect the drilling.

[0065] The lead screw module 12 operates, driving the automatic punching machine 14 to feed downwards in the vertical direction. During the feeding process, the automatic punching machine 14 completes the cutting and punching operation on the tire mold.

[0066] During this process, the cutting tool of the automatic punching machine 14 is heated, which enhances its cutting ability; the tire mold is kept at a low temperature under the cooling effect of liquid nitrogen, thereby forming a significant temperature gradient between the cutting tool and the tire mold, so that the cutting heat is mainly concentrated on the side of the cutting tool and is quickly carried away, rather than easily diffused into the mold.

[0067] This operating method effectively reduces the thermal expansion and thermal stress concentration of the tire mold during the drilling process, improving the accuracy of hole dimensions and the surface quality of the hole wall.

[0068] After the automatic punching machine 14 completes punching to the set depth, the lead screw module 12 reverses, causing the automatic punching machine 14 and the cutting tool to exit the punching area and return to the initial standby position.

[0069] Subsequently, the liquid nitrogen delivery mechanism 20 can be shut down or kept in operation as needed, the heating mechanism 50 gradually stops heating the cutting tool, the workpiece adjustment mechanism 30 runs again, adjusts the tire mold to the next hole to be processed, and repeats the above cooling, heating and drilling process to realize continuous automatic drilling operation for multiple holes.

[0070] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An automatic piercing device for a tire mold, characterized by: include A frame (111) is provided with a support plate (112) fixedly mounted on its top. An automatic punching mechanism (10) is fixedly installed on one side of the top of the support plate (112); The workpiece adjustment mechanism (30) is fixedly installed on the other side of the top of the support plate (112) and is correspondingly set with the automatic punching mechanism (10); A liquid nitrogen cooling mechanism (40) is disposed on the upper part of the workpiece adjustment mechanism (30); A liquid nitrogen delivery mechanism (20) and a heating mechanism (50) are respectively disposed on both sides of the automatic drilling mechanism (10), wherein the liquid nitrogen delivery mechanism (20) is connected to the liquid nitrogen cooling mechanism (40) to supply liquid nitrogen thereto, and the heating mechanism (50) is used to provide heat to the cutting tool area of ​​the automatic drilling mechanism (10).

2. An automatic piercing device for tire molds according to claim 1, characterized in that: The heating mechanism (50) includes a blower (51), a heater (52), a heat transfer pipe (53), and a positioning plate (54); The blower (51) and the heater (52) are both fixedly installed on the support plate (112), and the output end of the blower (51) is fixedly connected to the input end of the heater (52); One end of the heat transfer pipe (53) is fixedly connected to the output end of the heater (52), and the other end of the heat transfer pipe (53) extends to the automatic punching mechanism (10) and is set in accordance with the tool area; The positioning plate (54) is fixedly installed on the support plate (112) and is used to position and support the heat transfer pipe (53).

3. An automatic piercing device for tire molds according to claim 2, characterized in that: The liquid nitrogen delivery mechanism (20) includes a liquid nitrogen tank (22), and a nitrogen delivery pipe (23) is fixedly connected to the bottom of the liquid nitrogen tank (22). One end of the nitrogen delivery pipe (23) is provided with an injection head (24), and the other end of the nitrogen delivery pipe (23) is fixedly connected to a nitrogen delivery hose (26). A cold temperature gauge (25) is provided at the connection between the nitrogen delivery pipe (23) and the nitrogen delivery hose (26). The delivery pump (27) is fixedly installed on the support plate (112). The input end of the delivery pump (27) is fixedly connected to one end of the first nitrogen delivery hose (26), and the output end of the delivery pump (27) is fixedly connected to the second nitrogen delivery hose (29).

4. An automatic piercing device for tire molds according to claim 3, characterized in that: The liquid nitrogen tank (22) is provided with two fixing clamps (211) on the outside. A fixing frame (21) is fixedly installed on one side of the support plate (112). The liquid nitrogen tank (22) is fixedly connected to the fixing frame (21) by the two fixing clamps (211).

5. An automatic piercing device for tire molds according to claim 4, characterized in that: Valves (28) are provided at the connection between the first nitrogen delivery hose (26) and the delivery pump (27), and at the connection between the delivery pump (27) and the second nitrogen delivery hose (29).

6. An automatic punching device for tire molds according to claim 5, characterized in that: The liquid nitrogen cooling mechanism (40) includes a gantry (41), the bottom of which is fixedly connected to the support plate (112). A drive cylinder (42) is provided on the gantry (41), and a support block (43) is fixedly connected to the output end of the drive cylinder (42). A side bracket (44) is fixedly connected to one side of the support block (43), a side support plate (45) is fixedly connected to the side bracket (44), and a trapezoidal cooling cover (46) is fixedly connected to one side of the side support plate (45). The other end of the nitrogen delivery hose (29) is configured with two branch pipes, which are respectively fixedly connected to the top of the trapezoidal cooling shield (46).

7. An automatic punching device for tire molds according to claim 6, characterized in that: The workpiece adjustment mechanism (30) includes a groove shell (31), which is mounted on a support plate (112); A linear cylinder (32) is fixedly connected to the inner wall of the tank shell (31), and a fixing plate (33) is fixedly connected to the output end of the linear cylinder (32). A top support plate (36) is fixedly connected to the top of the fixed plate (33), and a rotary cylinder (37) is fixedly connected to the top of the top support plate (36).

8. An automatic punching device for tire molds according to claim 7, characterized in that: The inner bottom wall of the tank shell (31) is fixedly connected to two guide rails (34) on both sides, and guide sliders (35) are slidably connected on the two guide rails (34). The two sides of the fixing plate (33) are fixedly connected to the two guide sliders (35) respectively.

9. An automatic punching device for tire molds according to claim 8, characterized in that: The automatic punching mechanism (10) includes a vertical support (11) and a lead screw module (12). A vertically arranged lead screw module (12) is fixedly installed on one side of the vertical support (11), and an automatic punching machine (14) is fixedly connected to one side of the sliding block of the lead screw module (12). The front sides of the vertical support (11) are respectively fixedly connected with slide rails (13), and the two slide rails (13) are used to guide the vertical movement of the automatic punching machine (14); A temperature sensor (15) is fixedly installed on one side of the bottom of the sliding block of the lead screw module (12), and the temperature sensor (15) is located on the side of the cutting tool of the automatic punching machine (14). The other end of the heat transfer pipe (53) is arranged vertically to the cutting tool of the automatic drilling machine (14).

10. An automatic punching device for tire molds according to claim 9, characterized in that: A control box (13) is installed on one side of the mounting bracket (21).

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