Punching equipment capable of eliminating stress of silicon steel sheet

Abstract

A central control host is connected to the outside of a furnace body, ground rails are symmetrically arranged on the two sides of the inner bottom wall of the furnace body, a slidable isolation placement frame is arranged on the ground rails, a gate is arranged on the front face of the furnace body, and a blowing assembly corresponding to the isolation placement frame is arranged on the front face of the gate. A calibration assembly is arranged on the side, away from the center control host, of the furnace body, a sensor set is arranged on the inner top wall of the furnace body, and a punching assembly used for punching steel sheets is arranged at the top of the furnace body. According to the punching equipment capable of eliminating the stress of the silicon steel sheet, heating is conducted through the induction coil in the furnace body, so that the silicon steel sheet is rapidly heated, the silicon steel sheet placed in the furnace body is softened, the stress of the silicon steel sheet is greatly reduced, and a drill bit conducts punching treatment on the silicon steel sheet at the moment; and the silicon steel sheet is continuously in a high-temperature annealing state after punching, so that the stress of the silicon steel sheet is eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of hot processing of transformer silicon steel sheets, and specifically relates to a punching device capable of eliminating the stress of silicon steel sheets. Background Art

[0002] In the power electronics and transformer manufacturing industries, silicon steel sheets, as key soft magnetic materials, directly affect the energy efficiency and reliability of equipment. Silicon steel sheets are widely used in the manufacture of transformer cores due to their high magnetic permeability, low loss, and other characteristics.

[0003] Traditional silicon steel sheet punching devices mostly use mechanical stamping or laser cutting and other methods. Although these methods can effectively complete the punching operation, due to the certain hardness and brittleness of the silicon steel sheet itself, the impact and extrusion of the cutting tool on the material during punching will cause stress inside the material, resulting in problems such as a decrease in magnetic properties, changes in mechanical properties, and an increase in losses of the silicon steel sheet during the punching process. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a punching device and system capable of eliminating the stress of silicon steel sheets, which can eliminate the stress generated during the punching process of silicon steel sheets through hot processing and improve the punching quality of silicon steel sheets.

[0005] Based on the specification, the present invention provides a punching device capable of eliminating the stress of silicon steel sheets, including a furnace body. The outside of the furnace body is connected with a central control host. On both sides of the inner bottom wall of the furnace body, ground rails are symmetrically arranged. A slidable isolation placement rack is arranged on the ground rails. A large door is arranged on the front of the furnace body. A blowing component corresponding to the isolation placement rack is arranged on the front of the large door. A calibration component is arranged on one side of the furnace body away from the central control host. A sensor group is arranged on the inner top wall of the furnace body. A punching component for punching steel sheets is arranged on the top of the furnace body. An outlet is opened at the bottom of the furnace body. A receiving box corresponding to the position of the outlet is arranged at the bottom of the furnace body. A plurality of exhaust pipes are arranged on the side wall of the receiving box.

[0006] The isolation placement rack includes two rack rails slidably connected to the ground rails. A vertical rack is fixedly connected to the top of the rack rails. A plurality of isolation plates are arranged between the two vertical racks at equal intervals up and down. A retaining frame is fixedly connected to the top edge of the isolation plate. Three reserved holes are arranged at equal intervals left and right inside the isolation plate. Calibration grooves are arranged on both sides of the isolation plate away from the retaining frame.

[0007] Optionally, the calibration component includes electric push rods respectively arranged on both side walls of the furnace body. An installation plate is arranged on the telescopic end of the electric push rod. A push rod is fixedly connected to the side of the installation plate close to the furnace body. One end of the push rod away from the installation plate penetrates the furnace body and extends to the inside and is connected with a calibration plate. The calibration plate is adapted to the calibration groove.

[0008] In the above technical solution, the calibration component realizes the precise calibration of the silicon steel sheet through the cooperation of the electric push rod, the mounting plate, the push rod and the calibration plate, improving the accuracy of the punching position.

[0009] Optionally, the punching component includes two hydraulic cylinders arranged on the left and right side walls of the furnace body. A connecting plate is jointly connected to the telescopic ends of the two hydraulic cylinders, and three equally spaced punching drill rods are fixedly connected to the bottom of the connecting plate.

[0010] In the above technical solution, the three equally spaced punching drill rods can punch the silicon steel sheet at three positions simultaneously, improving the production efficiency.

[0011] Optionally, one end of the punching drill rod away from the connecting plate penetrates through the furnace body and extends to the inside, and the punching drill rod is adapted to the reserved hole.

[0012] Optionally, the blowing component includes a hot air blower arranged on the front of the large door. A hot air box is arranged on the side of the large door away from the hot air blower. A plurality of air outlet plate boxes are fixedly connected to the side of the hot air box close to the isolation placement rack, and a wind gathering nozzle is integrally connected to one end of the air outlet plate box away from the hot air box.

[0013] In the above technical solution, the blowing component, through the cooperation of the hot air blower, the hot air box, the air outlet plate box and the wind gathering nozzle, facilitates blowing the steel sheet waste dropped during the punching process into the inside of the material receiving box through the gap between the isolation plates for collection.

[0014] Optionally, the air outlet plate box corresponds to the gap position between the upper and lower adjacent isolation plates, and the interiors of the air outlet plate box and the hot air box are both cavity structures.

[0015] Optionally, the sensor group includes a temperature sensor and an infrared sensor. The temperature sensor and the infrared sensor are arranged on the inner top wall of the furnace body and above the isolation placement rack.

[0016] In the above technical solution, the temperature sensor is used to monitor the temperature inside the furnace in real time, so as to accurately control the temperature of the silicon steel sheet heating, and the infrared sensor is used to monitor the deformation change amount of the silicon steel sheet.

[0017] Optionally, a serpentine distributed induction coil is provided on the inner wall of the furnace body, and symmetrically arranged limiting blocks are fixedly installed on the left and right inner walls of the furnace body. The limiting blocks are located on the back of the isolation placement rack.

[0018] Heating the furnace body through the induction coil, thereby heating the silicon steel sheet, reduces the generation of thermal stress.

[0019] Optionally, a filter screen is arranged inside the exhaust pipe, a baffle is fixedly connected to the bottom of the furnace body, the material receiving box is placed at the bottom of the furnace body and abuts against the baffle, and bottom plates are arranged on both sides of the bottom of the material receiving box. The material receiving box is clamped between the two bottom plates.

[0020] Compared with the prior art, the technical solution of the present application has the following beneficial effects:

[0021] The punching device capable of eliminating the stress of silicon steel sheets: 1. Through the isolation placement rack, multiple silicon steel sheets can be stacked and placed up and down and isolated and then put into the furnace body together, which is convenient for heating multiple silicon steel sheets at the same time; 2. Heating is carried out through the induction coil in the furnace body, so that the silicon steel sheets are quickly heated up, the silicon steel sheets placed in the furnace body are softened, the stress of the silicon steel sheets themselves is greatly reduced, and the drill bit punches the silicon steel sheets at this time. When the softened silicon steel sheets are punched, the degree of deformation is greatly reduced, and the silicon steel sheets are kept in a high-temperature annealing state after punching, further eliminating the stress of the silicon steel sheets; 3. By calculating the stress of the silicon steel sheets in real time with the change of temperature, it is possible to more accurately control the stress of the silicon steel sheets to be at the theoretically lowest point, thereby minimizing the stress influence generated by punching the silicon steel sheets and improving the yield rate of the punching process of the silicon steel sheets. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional view from the front left side of a punching device capable of eliminating the stress of silicon steel sheets provided by an embodiment of the present invention;

[0023] Figure 2 It is a three-dimensional view of the front right side section of a punching device capable of eliminating the stress of silicon steel sheets provided by an embodiment of the present invention;

[0024] Figure 3 It is a three-dimensional view of the right side section of a punching device capable of eliminating the stress of silicon steel sheets provided by an embodiment of the present invention;

[0025] Figure 4 It is provided by an embodiment of the present invention Figure 3 The enlarged schematic view at A in;

[0026] Figure 5 It is provided by an embodiment of the present invention Figure 3 The enlarged schematic view at B in;

[0027] Figure 6 It is a three-dimensional view of the front right side of a punching device capable of eliminating the stress of silicon steel sheets provided by an embodiment of the present invention;

[0028] Figure 7 It is a three-dimensional view of the rear side of a punching device capable of eliminating the stress of silicon steel sheets provided by an embodiment of the present invention;

[0029] Figure 8Schematic diagram of the isolation rack provided by the embodiment of the present invention;

[0030] Figure 9 Bottom-up three-dimensional view of a punching device capable of eliminating stress of silicon steel sheets provided by the embodiment of the present invention;

[0031] Figure 10 Bottom view of the inner top wall of a punching device capable of eliminating stress of silicon steel sheets provided by the embodiment of the present invention;

[0032] Figure 11 Schematic diagram of the top view section of a punching device capable of eliminating stress of silicon steel sheets provided by the embodiment of the present invention.

[0033] In the figure: 1. Furnace body; 11. Induction coil; 12. Limit block; 13. Discharge port; 2. Central control host; 3. Large door; 4. Ground rail; 5. Isolation rack; 51. Vertical rack; 52. Isolation plate; 53. Baffle frame; 54. Reserved hole; 55. Calibration groove; 56. Rack rail; 6. Calibration component; 61. Push rod; 62. Calibration plate; 63. Mounting plate; 64. Electric push rod; 7. Punching component; 71. Hydraulic cylinder; 72. Connecting plate; 73. Punching drill rod; 8. Blowing component; 81. Hot air blower; 82. Hot air box; 83. Air outlet plate box; 831. Air gathering nozzle; 9. Sensor group; 10. Material receiving box; 101. Exhaust pipe; 102. Baffle. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figures 1-4 , the device in the embodiment of the present invention adopts a modular integrated design and is mainly composed of a heat treatment module, a precision positioning module, an automatic punching module and a waste treatment system. The furnace body 1 is used as the core load-bearing structure and is constructed by a double-layer 304 stainless steel shell, and the interlayer is filled with high-temperature ceramic fiber heat insulation materials. Its outer wall is integrated with an industrial-grade central control host 2, which is equipped with a PLC control system and a human-machine interface, and has functions of parameter setting, process curve programming and real-time data monitoring. Particularly, high-precision ground rails 4 are symmetrically arranged on both sides of the bottom of the furnace body 1. The ground rails adopt a composite structure of V-shaped guide rails and rollers, and the surface is nitrided and hardened, and the surface roughness is controlled within Ra0.8, and it can carry a maximum load of 5 tons. The isolation rack 5 forms a sliding fit with the ground rail 4 through the bottom slider, and its sliding accuracy can reach ±0.05 mm.

[0036] The ground rail 4 is provided with a slidable isolation placement rack 5. A large door 3 is provided on the front of the furnace body 1. The large door 3 adopts an airtight electric translation large door (sealing level IP67). The front of the large door 3 is integrated with a hot air slag removal system, specifically a blowing component 8. A calibration component 6 is provided on one side of the furnace body 1 away from the central control host 2. A sensor group 9 is provided on the inner top wall of the furnace body 1. The sensor group 9 is configured as a distributed sensor array. A punching component 7 for punching steel sheets is provided on the top of the furnace body 1. An outlet 13 is opened at the bottom of the furnace body 1. A receiving box 10 corresponding to the position of the outlet 13 is provided at the bottom of the furnace body 1. A plurality of exhaust pipes 101 are provided on the side wall of the receiving box 10.

[0037] The isolation placement rack 5 includes two rack rails 56 slidably connected to the ground rail 4. A vertical rack 51 is fixedly connected to the top of the rack rail 56. A plurality of isolation plates 52 are arranged at equal intervals up and down between the two vertical racks 51. A retaining frame 53 is fixedly connected to the top edge of the isolation plate 52. Three reserved holes 54 are arranged at equal intervals left and right inside the isolation plate 52. Calibration grooves 55 are opened on both sides of the isolation plate 52 away from the retaining frame 53.

[0038] During the actual operation process, after putting the isolation placement rack 5 filled with silicon steel sheets into the furnace body 1, by pushing the push rod 61 to move through the electric push rod 64, the calibration plate 62 can be moved into the calibration groove 55, so that the two calibration plates 62 push the silicon steel sheets on each layer of the isolation plate 52 to the corners of the retaining frame 53 and fit them, thus achieving the effect of calibrating the position of the silicon steel sheets. This calibration process is crucial for subsequent punching processing. Only by ensuring the accurate position of the silicon steel sheets can the accuracy and quality of punching be guaranteed.

[0039] Please refer to Figure 6 、 Figure 7 、 Figure 8 In this embodiment, the calibration component 6 includes electric push rods 64 respectively arranged on both side walls of the furnace body 1. An installation plate 63 is arranged on the telescopic end of the electric push rod 64. A push rod 61 is fixedly connected to one side of the installation plate 63 close to the furnace body 1. One end of the push rod 61 away from the installation plate 63 penetrates the furnace body 1 and extends to the inside and is connected with a calibration plate 62. The calibration plate 62 is adapted to the calibration groove 55.

[0040] Among them, the calibration plate 62 is finely processed from H13 hot work die steel, and its contact surface is mirror polished (surface roughness Ra0.2), and forms a clearance fit (fit tolerance H7 / g6) with the calibration groove 55 of the isolation plate 52. During the calibration process, the central control host 2 synchronously drives the two electric push rods 64 through a closed-loop control algorithm, so that the calibration plate 62 is inserted into the calibration groove 55 at a constant speed of 0.5 m / s, and the silicon steel sheets are three-dimensionally positioned with the retaining frame 53 through progressive pushing, and the positioning repeat accuracy reaches ±0.02 mm.

[0041] When the calibration component 6 is working, the central control host 2 controls the synchronous advancement of the double electric push rods 64 according to the feedback signal of the sensor group 9, so that the calibration plate 62 is inserted into the calibration groove 55 at a speed of 0.5 m / s, and the silicon steel sheet is accurately positioned at the X-Y reference angle of the retaining frame 53 through the wedge-shaped guiding surface, and the positioning accuracy reaches ±0.1 mm.

[0042] Through this structural design, the calibration component 6 can achieve precise calibration of the silicon steel sheet, providing a reliable guarantee for subsequent punching processing.

[0043] Please refer to Figure 3 、 Figure 8 、 Figure 11 As shown in, the punching component 7 includes two hydraulic cylinders 71 arranged on the left and right side walls of the furnace body 1. A connecting plate 72 is jointly connected to the telescopic ends of the two hydraulic cylinders 71. Three equally spaced punching drill rods 73 are fixedly connected to the bottom of the connecting plate 72. The end of the punching drill rod 73 away from the connecting plate 72 penetrates the furnace body 1 and extends to the inside, and the punching drill rod 73 is adapted to the reserved hole 54.

[0044] In this embodiment, the two groups of hydraulic cylinders 71 (working pressure 20 MPa, cylinder diameter 80 mm) are fixed at the position of the furnace body stiffener through flanges. The connecting plate 72 is made of integrally forged 45# steel plate. After the punching drill rod 73 is quenched and tempered, the hardness reaches HRC28-32. The drill rod is made of hard alloy YG8 material, and the cutting edge is designed in a four-edge stepped manner, and a 60° guiding cone angle is provided at the front end, forming a dynamic fit with the reserved hole 54 of the partition plate 52 (radial clearance 0.1-0.15 mm). During the punching process, the hydraulic cylinder 71 drives the punching drill rod 73 to move downward, and punches the multi-layer silicon steel sheet step by step.

[0045] It should be noted that during punching, the hydraulic system performs multi-stage pressure control: the initial stage uses a pressure of 5 MPa to pre-press the material, the middle stage uses a pressure of 15 MPa to complete the perforation, and the final stage uses a pressure of 3 MPa to retract the tool, effectively avoiding the hole diameter deviation caused by material springback.

[0046] This punching method not only improves the punching efficiency, but also ensures the punching accuracy and quality.

[0047] Please refer to Figure 1 、 Figure 4 As shown in, the blowing component 8 in this embodiment includes a hot air blower 81 arranged on the front of the large door 3. The hot air blower 81 is a 30 kW variable-frequency hot air blower (air volume 0-200 m 3 / min is adjustable, and the temperature control range is 50 - 600 °C). On the side of the large door 3 far from the hot air blower 81, there is a hot air box 82. On the side of the hot air box 82 close to the isolation placement rack 5, there are multiple air outlet plate boxes 83 fixedly connected. To ensure that the air flow distribution uniformity > 90%, at the end of the air outlet plate box 83 far from the hot air box 82, there is an air gathering nozzle 831 integrally connected. The width of the air outlet plate box 83 matches the width of the isolation placement rack 5. When air is discharged, the hot air blower 81 outputs wind force into the hot air box 82, and then it is shunted by multiple air outlet plate boxes 83, and the hot air blows towards the surface of the silicon steel sheet in the form of an air curtain through the air gathering nozzle 831.

[0048] The position of the gap between the air outlet plate box 83 and the upper and lower adjacent isolation plates 52 corresponds. The interiors of both the air outlet plate box 83 and the hot air box 82 are cavity structures. It should be noted that the gaps between multiple air gathering nozzles 831 and the adjacent isolation plates 52 are arranged staggeredly, so that the air blown out by each air gathering nozzle 831 can blow through the gaps between the adjacent isolation plates 52.

[0049] In this embodiment, the air outlet plate box 83 is welded and formed by 316L stainless steel. The internal flow channel is optimized by CFD design. The end air gathering nozzle 831 is a tapered nozzle structure (contraction ratio 1:8), and the outlet air speed can reach 35 m / s. With such a specially designed staggered nozzle layout, a 5 - mm overlapping coverage area is formed between each nozzle and the gap of the isolation plate, ensuring that the waste removal rate on the surface of the silicon steel sheet > 99%. When the system works, the 200 °C hot air immediately performs stress relief treatment on the workpiece after punching, and at the same time blows the punching waste into the bottom material receiving system.

[0050] This design not only effectively solves the problem of waste cleaning during the punching process, but also improves the automation degree and working efficiency of the equipment.

[0051] Please refer to Figure 3 、 Figure 10 In this embodiment, the sensor group 9 includes a temperature sensor and an infrared sensor. The temperature sensor and the infrared sensor are arranged on the inner top wall of the furnace body 1 and above the isolation placement rack 5. Through the sensor group 9, the temperature inside the furnace body 1 and the length change of the silicon steel sheet can be monitored in real time, providing accurate data support for the central control host 2, so as to realize the precise control of the punching process.

[0052] Specifically, a closed-loop control system is formed by the sensor group 9: 8 K-type thermocouples (temperature measurement range 0 - 800 °C, accuracy ±1 °C) are distributed in a distributed manner on the furnace top, and 16 pairs of infrared ranging sensors (range 0 - 500 mm, resolution 0.01 mm). The sensor data is transmitted to the central control host in real time through the PROF INET bus. The system dynamically corrects the punching position compensation amount according to the thermal expansion coefficient formula ΔL = α·L0·ΔT. When it is detected that the length change of a certain layer of silicon steel sheet exceeds the tolerance of ±0.15 mm, the system automatically triggers the calibration program to ensure the hot processing accuracy.

[0053] Please refer to Figure 2 , on the inner wall of the furnace body 1 in this embodiment, there is an induction coil 11 distributed in a snake shape. On the left and right inner walls of the furnace body 1, symmetrically arranged limit blocks 12 are fixedly installed. The limit blocks 12 are located on the back of the isolation placement rack 5. The design of the induction coil 11 enables the furnace body 1 to uniformly heat the silicon steel sheet, while the limit blocks 12 can prevent the isolation placement rack 5 from shifting during the sliding process, thereby ensuring the stable operation of the equipment.

[0054] In this embodiment, the induction coil 11 on the inner wall of the furnace body 1 is wound with a rectangular copper tube (cross-sectional area 10×15 mm), and a 10 kHz intermediate frequency current is passed through to generate an alternating magnetic field, causing eddy current heating inside the silicon steel sheet. The coil spacing is optimized through electromagnetic simulation to ensure the temperature uniformity in the working area is ±5 °C. The limit block 12 is made of tungsten steel (hardness HRA90), and forms a three-point positioning with the isolation placement rack 5 through a hydraulic clamping device, and the impact resistance is 5000 N.

[0055] It should be noted that the induction coil 11, the hydraulic cylinder 71, the sensor group 9, the hot air blower 81, and the electric push rod 64 are all electrically connected to the central control host 2. The temperature inside the furnace body 1 is accurately controlled through the central control host 2, and by real-time monitoring the length change of the silicon steel sheet and combining the temperature gradient data, the thermal stress coefficient of the silicon steel sheet is calculated. This intelligent control system enables the equipment to operate automatically, greatly improving the production efficiency and product quality.

[0056] In this embodiment, a filter screen is provided inside the exhaust pipe 101. The bottom of the furnace body 1 is fixedly connected with a baffle 102. The receiving box 10 is placed at the bottom of the furnace body 1 and abuts against the baffle. On both sides of the bottom of the receiving box 10, there are bottom plates, and the receiving box 10 is clamped between the two bottom plates. This design not only facilitates the collection and cleaning of waste materials, but also improves the sealing and safety of the equipment.

[0057] Preferably, a three - stage filtration is provided inside the box body: a primary stainless - steel sintered mesh (mesh number 100), a secondary ceramic fiber filter cartridge (filtration accuracy 5μm), and a final activated carbon layer (iodine value 1000). The exhaust pipe 101 is equipped with a differential pressure alarm device, which prompts to replace the filter material when the filtration resistance exceeds 500 Pa. The material receiving box is quickly connected to the furnace body through a pneumatic locking device, and the universal wheels at the bottom are equipped with an electromagnetic braking function to ensure transportation safety.

[0058] Finally, the intelligent control system realizes full - process automation: the central control host 2 automatically sets the heating curve according to the material database (typical process: heating to 550°C at a rate of 10°C / min, and starting punching after holding for 30 min), and synchronously coordinates the timing actions of the hydraulic system, hot - air system, and positioning system. During the stress relief stage, the system dynamically adjusts the holding and cooling rates based on the strain data collected in real - time, so that the residual stress elimination rate > 85%.

[0059] The usage method of the above - mentioned embodiment includes:

[0060] 1. Place multiple silicon steel sheets on the top of each layer of the isolation plate 52 respectively, slide the isolation placement rack 5 into the furnace body 1, and then close the large door;

[0061] 2. First, through the central control host 2, control the electric push rod 64 on the right side of the furnace body to push the calibration plate 62 on the right side to move into the calibration groove 55 longitudinally arranged on the isolation plate 52, so that the left side of the silicon steel sheet fits against the inner left side wall of the stop frame 53. Then, control the electric push rod 64 on the back of the furnace body 1 to push the calibration plate 62 on the back to move into the calibration groove 55 transversely arranged on the isolation plate 52, so that the silicon steel sheet can fit at the corner of the stop frame 53, thereby achieving the effect of synchronous calibration for each layer of silicon steel sheets.

[0062] 3. Precisely control the temperature inside the furnace body 1 through the central control host 2, so that the central control host 2 gradually raises the temperature according to the heating stages;

[0063] 4. Use the temperature sensor in the sensor group 9 to monitor the internal temperature of the silicon heater in real - time, and use the infrared sensor in the sensor group 9 to monitor the initial length of the silicon steel sheet and the length change amount of the silicon steel sheet at each heating step;

[0064] 5. The central control host 2 calculates the thermal expansion coefficient of the silicon steel sheet based on the obtained initial length and the length change of the silicon steel sheet at each heating step, and calculates the thermal stress coefficient of the silicon steel sheet based on the calculated thermal expansion coefficient and the known elastic modulus and Poisson's ratio of the silicon steel sheet;

[0065] 6. When the thermal stress coefficient calculated by the central control host 2 reaches the lowest value, stop heating and maintain the temperature, and then control the hydraulic cylinder 71 to drive multiple punching drill rods 73 to move downward to punch the multi - layer silicon steel sheets step by step.

[0066] 7. During the punching process, the waste materials generated fall onto the silicon steel sheets on the lower layer. At this time, the hot air blower 81 is started to make hot air blow out from multiple air-gathering nozzles 831, forming an air curtain on the silicon steel sheets, so that the waste materials on the silicon steel sheets are blown into the material receiving box 10 for collection;

[0067] 8. After the punching is completed, when the temperature of the furnace body 1 drops to a specific temperature, it is maintained for a period of time to complete annealing, so that the stress on the silicon steel sheets disappears. Finally, the isolation placement rack 5 can be taken out, and the isolation placement rack 5 containing the unpunched silicon steel sheets can be pushed into the furnace body 1, and the operation can be repeated.

[0068] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0069] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A punching device capable of eliminating stress of silicon steel sheets, comprising a furnace body, characterized in that: The furnace body is connected to a central control host, the furnace body is symmetrically provided with ground rails on both sides of the bottom wall, a slidable isolation rack is provided on the ground rails, a door is provided on the front of the furnace body, a blowing assembly corresponding to the isolation rack is provided on the front of the door, a calibration assembly is provided on the side of the furnace body away from the central control host, a sensor group is provided on the inner top wall of the furnace body, a punching assembly for punching steel sheets is provided on the top of the furnace body, a discharge port is opened at the bottom of the furnace body, a material receiving box corresponding to the position of the discharge port is provided at the bottom of the furnace body, and a plurality of exhaust pipes are provided on the side wall of the material receiving box; The isolation rack includes two frame rails slidably connected to the ground rails, the top of the frame rails is fixedly connected to a vertical frame, a plurality of isolation plates equidistantly distributed up and down are arranged between the vertical frames on both sides, a baffle frame is fixedly connected to the top edge of the isolation plate, three reserved holes equidistantly arranged left and right are opened inside the isolation plate, and calibration grooves are opened on both sides of the isolation plate away from the baffle frame.

2. The punching device capable of eliminating stress of silicon steel sheet according to claim 1, characterized in that: The calibration assembly includes electric push rods respectively arranged on both side walls of the furnace body, and a mounting plate is arranged on the telescopic end of the electric push rod. A push rod is fixedly connected to the side of the mounting plate close to the furnace body, and an end of the push rod away from the mounting plate extends through the furnace body to the interior and is connected to a calibration plate, and the calibration plate is adapted to the calibration slot.

3. The punching device capable of eliminating stress of silicon steel sheet according to claim 1, characterized in that: The punching assembly comprises two hydraulic cylinders arranged on the left and right side walls of the furnace body, the telescopic ends of the two hydraulic cylinders are commonly connected with a connecting plate, and the bottom of the connecting plate is fixedly connected with three equidistantly distributed punching drill rods.

4. The punching device capable of eliminating stress of silicon steel sheet according to claim 3, characterized in that: One end of the punching drill rod away from the connecting plate passes through the furnace body and extends to the interior, and the punching drill rod is adapted to the reserved hole.

5. The punching device capable of eliminating stress of silicon steel sheet according to claim 1, characterized in that: The blowing assembly includes a hot air blower arranged in front of the door, a hot air box is arranged on the side of the door away from the hot air blower, a plurality of air outlet plate boxes are fixedly connected to the side of the hot air box close to the isolation placement rack, and an air collecting nozzle is integrally connected to the end of the air outlet plate box away from the hot air box.

6. The punching device capable of eliminating stress of silicon steel sheet according to claim 5, characterized in that: The air outlet plate box corresponds to the gap position between the upper and lower adjacent isolation plates, and the interiors of the air outlet plate box and the hot air box are both cavity structures.

7. The punching device capable of eliminating stress of silicon steel sheet according to claim 1, characterized in that: The sensor group includes a temperature sensor and an infrared sensor, and the temperature sensor and the infrared sensor are arranged on the inner top wall of the furnace body and located above the isolation placement rack.

8. The punching device capable of eliminating stress of silicon steel sheet according to claim 1, characterized in that: The inner wall of the furnace body is provided with an induction coil distributed in a serpentine shape, and symmetrically arranged limit blocks are fixedly installed on the inner walls on the left and right sides of the furnace body, and the limit blocks are located on the back side of the isolation placement rack.

9. The punching device capable of eliminating stress of silicon steel sheet according to claim 1, characterized in that: A filter is arranged inside the exhaust pipe, a baffle is fixedly connected to the bottom of the furnace body, the material receiving box is placed at the bottom of the furnace body and abuts against the baffle, bottom plates are arranged on both sides of the bottom of the material receiving box, and the material receiving box is clamped between the two bottom plates.

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