Magnesium alloy die casting punching device

Abstract

The invention discloses a magnesium alloy die casting punching device, which belongs to the technical field of punching and comprises a base, a punching seat is slidably connected onto the base, a driving mechanism is connected onto the punching seat, the driving mechanism drives the punching seat to move, an ultrasonic vibration generator is arranged on the punching seat, and a punching tool bit is fixedly connected onto the ultrasonic vibration generator. A blanking hole is formed in the base and located under the punching tool bit, after the magnesium alloy die casting is fixed to the base, the ultrasonic vibration generator transmits vibration to the punching tool bit, and the punching tool bit punches the magnesium alloy die casting. The punching tool bit is subjected to ultrasonic vibration, burrs generated in the punching process are effectively reduced, the appearance quality and the size precision of the magnesium alloy die casting are improved, effective breakage of the roots of the burrs can be achieved, the burrs are removed more thoroughly, the qualified rate of products is increased, an additional deburring technology is not needed, the production efficiency is improved, and the production cost is reduced. And meanwhile, the production cost is also reduced.

Description

Technical Field

[0001] This invention belongs to the field of punching technology, and particularly relates to a punching device for magnesium alloy die castings. Background Technology

[0002] Currently, in the production of magnesium alloy die castings, the die castings after punching need to be polished to make their surfaces smooth. The traditional method of deburring is to remove burrs manually or mechanically after punching. Manual polishing requires workers to have certain skills and experience, is labor-intensive, and the polishing effect is inconsistent, easily resulting in missed polishing or over-polishing. Although mechanical polishing is relatively more efficient, it is difficult to guarantee the thorough removal of burrs for some complex-shaped die castings. At the same time, the uncertainty of this production process leads to low production efficiency and increased production costs. Moreover, existing processing equipment cannot effectively break the burr root, making it difficult to completely remove burrs during the polishing process. The re-polishing of unqualified products also increases production costs.

[0003] Therefore, there is an urgent need to design a punching and cutting device for magnesium alloy die castings to solve the problems of low efficiency and poor effect in burr grinding of magnesium alloy die castings mentioned above. Summary of the Invention

[0004] To address the technical problems of low efficiency and poor results in burr removal of magnesium alloy die castings mentioned in the background art, a punching and cutting device for magnesium alloy die castings is provided to solve the above problems.

[0005] To achieve the above objectives, the specific technical solution of the magnesium alloy die-casting punching device of the present invention is as follows: A magnesium alloy die-casting punching device includes a base, a punching seat slidably connected to the base, a driving mechanism connected to the punching seat, the driving mechanism driving the punching seat to move, an ultrasonic vibration generator installed on the punching seat, a punching cutter head fixedly connected to the ultrasonic vibration generator, and a material discharge hole opened on the base, the material discharge hole being located directly below the punching cutter head. After the magnesium alloy die-casting is fixed on the base, the ultrasonic vibration generator transmits vibration to the punching cutter head, and the punching cutter head punches the magnesium alloy die-casting.

[0006] Furthermore, a receiving groove is provided at the bottom of the punching seat, and the ultrasonic vibration generator includes a transducer connected to the receiving groove. An amplitude transformer is fixedly connected to the transducer, and the end of the amplitude transformer away from the transducer is fixedly connected to the punching head.

[0007] Furthermore, a buffer layer is provided at the connection between the receiving tank and the transducer to absorb the vibration transmitted from the amplitude transformer to the transducer.

[0008] Furthermore, a first flange is fixedly connected to the amplitude transformer, and a second flange is fixedly connected to the punching head. The first flange and the second flange are connected, thereby fixing the punching head to the ultrasonic vibration generator.

[0009] Furthermore, a first groove is provided on the first flange, and a second groove is provided on the second flange. The first groove and the second groove are joined to form a first accommodating cavity for placing a pressure sensor. The pressure sensor is used to detect the pressure between the punching head and the magnesium alloy die-casting part. An ultrasonic control box is also connected to the transducer. The ultrasonic control box is connected to a PLC controller, and the pressure sensor is connected to the PLC controller. Thus, the PLC controller adjusts the control parameters of the ultrasonic control box through the pressure sensor parameters.

[0010] Furthermore, an infrared temperature sensor is fixedly connected to the punching base to detect the temperature between the punching head and the magnesium alloy die-casting part. The infrared temperature sensor is connected to the PLC controller, so that the PLC controller adjusts the control parameters of the ultrasonic control box through the parameters of the infrared temperature sensor. An acceleration sensor is fixedly connected to the first flange to detect the three-dimensional vibration state of the punching head, focusing on extracting the transverse vibration acceleration data. Thus, the PLC controller adjusts the control parameters of the ultrasonic control box through the parameters of the acceleration sensor.

[0011] further, When the PLC controller detects that the pressure sensor reading is below the first pressure value, the PLC controller controls the ultrasonic control box to increase the output power until the pressure sensor reading rises back to the first pressure value. When the PLC controller detects that the pressure sensor reading is higher than the second pressure value, the PLC controller controls the ultrasonic control box to reduce the output power and reduce the pressure applied to the magnesium alloy die-casting by the punching head until the pressure sensor reading drops back to the second pressure value.

[0012] Furthermore, the PLC controller corrects the output power of the ultrasonic control box based on the parameters of the infrared temperature sensor; When the PLC controller detects that the infrared temperature sensor value is greater than or equal to the first temperature value, the PLC controller controls the ultrasonic control box to reduce the output power. When the PLC controller detects that the infrared temperature sensor reading is greater than or equal to the second temperature value, the PLC controller controls the ultrasonic control box to cut off the power, and at the same time, the PLC controller controls the drive mechanism to rise.

[0013] Furthermore, the PLC controller corrects the output power of the ultrasonic control box based on the parameters of the accelerometer sensor; When the PLC controller detects that the lateral vibration of the accelerometer exceeds the first preset value, the PLC controller controls the ultrasonic control box to gradually reduce the output power until the lateral vibration falls back to within the first preset value.

[0014] Furthermore, a fixing mechanism is provided on the base for fixing the magnesium alloy die-casting parts on the base; The fixing mechanism includes a flange fixedly connected to the base and a threaded rod rotatably connected to the base. A sliding stop is screwed onto the threaded rod, and the sliding stop is screwed onto the threaded rod. Rotating the threaded rod causes the sliding stop to move along the threaded rod towards the flange facing or away from it, so as to clamp or loosen the magnesium alloy die casting. Two threaded rods are symmetrically arranged, and the material discharge hole is located between the two threaded rods.

[0015] The magnesium alloy die-casting punching device of the present invention has the following advantages: This invention effectively reduces burr generation during the punching process by subjecting the punching head to ultrasonic vibration, thereby improving the appearance quality and dimensional accuracy of magnesium alloy die castings. It can effectively break the burr root, making burr removal more thorough and improving the product qualification rate. It eliminates the need for additional deburring processes, reduces processing steps and time, improves production efficiency, and also reduces production costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the magnesium alloy die-casting punching device of the present invention; Figure 2 This is a cross-sectional view of the magnesium alloy die-casting punching device of the present invention; Figure 3 for Figure 2 Enlarged view of part A in the image; Figure 4 for Figure 3 Enlarged view of part B in the image; Figure 5 This is a block diagram of the control system structure of the present invention; Figure 6 This is a schematic diagram of the base structure of the present invention.

[0017] The markings in the diagram are as follows: 1. Base; 101. Fixing mechanism; 1011. Edge guard; 1012. Threaded rod; 1013. Sliding stop; 2. Punching seat; 201. Receiving groove; 202. Buffer layer; 3. Material drop hole; 4. Ultrasonic vibration generator; 401. Transducer; 402. Amplifier; 4021. First flange; 5. Punching cutter head; 501. Second flange; 6. Magnesium alloy die casting; 7. Pressure sensor; 8. Infrared temperature sensor; 9. Accelerometer; 100. First groove; 200. Second groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0020] The following is a reference to the appendix. Figure 1 To be continued Figure 6 The present invention describes a magnesium alloy die-casting punching apparatus.

[0021] This invention provides a punching device for magnesium alloy die castings, such as... Figure 1-3 As shown, the system includes a base 1, a punching seat 2 slidably connected to the base 1, and a drive mechanism (not shown) connected to the punching seat 2. The drive mechanism drives the punching seat 2 to move. An ultrasonic vibration generator 4 is installed on the punching seat 2, and a punching cutter head 5 is fixedly connected to the ultrasonic vibration generator 4. A material discharge hole 3 is opened on the base 1, located directly below the punching cutter head 5. After the magnesium alloy die casting 6 is fixed on the base 1, the ultrasonic vibration generator 4 transmits vibration to the punching cutter head 5, and the punching cutter head 5 punches the magnesium alloy die casting 6. Specifically, by making the punching cutter head 5 perform ultrasonic vibration, the magnesium alloy die casting 6 is burr-free after punching, thereby improving production efficiency and product quality.

[0022] Preferably, the punching head 5 is made of a high-strength, high-hardness alloy material to ensure its wear resistance and cutting performance, while its surface is covered with an anti-adhesion coating. Optionally, the cutting tool is a diamond tool, and the coating is a TiB2 coating, thereby reducing magnesium chip adhesion, reducing frictional heat, and preventing localized high temperatures at chip accumulation sites.

[0023] As a preferred option, such as Figure 3As shown, the bottom of the punching base 2 is provided with a receiving groove 201. The ultrasonic vibration generator 4 includes a transducer 401, which is connected to the receiving groove 201. An amplitude transformer 402 is fixedly connected to the transducer 401. The end of the amplitude transformer 402 away from the transducer 401 is fixedly connected to the punching head 5. Specifically, the piezoelectric element inside the transducer 401 vibrates continuously, and the vibration is transmitted to the amplitude transformer 402. The amplitude transformer 402 then transmits the vibration to the punching head 5, so that the punching head 5 realizes ultrasonic vibration in the vertical direction.

[0024] Preferably, a buffer layer 202 is provided at the connection between the receiving groove 201 and the transducer 401 to absorb the vibration transmitted from the amplitude transformer 402 to the transducer 401. Specifically, under normal operating conditions, when the vibration frequency of the amplitude transformer 402 increases, the front cover of the transducer 401 will receive the vibration energy of the amplitude transformer 402, which will then be transmitted to the connection between the transducer 401 and the receiving groove 201, thereby increasing vibration interference. Therefore, a buffer layer 202 is provided at the connection between the receiving groove 201 and the transducer 401 to absorb vibration energy, prevent the punching seat 2 from vibrating, reduce vibration variables, and thus accurately control the vibration frequency of the punching head 5.

[0025] Preferably, the buffer layer 202 is made of nitrile rubber to match the vibration frequency of 10-50kHz during the magnesium alloy punching process. At the same time, it is understood that those skilled in the art can also use materials such as silicone rubber, polyurethane elastomer, porous ceramics or combinations thereof to form the buffer layer 202, thereby absorbing the vibration energy of the transducer 401.

[0026] As a preferred option, such as Figure 4 As shown, a first flange 4021 is fixedly connected to the amplitude transformer 402, and a second flange 501 is fixedly connected to the punching head 5. The first flange 4021 and the second flange 501 are connected, thereby fixing the punching head 5 to the ultrasonic vibration generator 4. Through the flange connection, the vibration of the amplitude transformer 402 and the punching head 5 is stably transmitted, and the maintenance and replacement of the punching head 5 are also convenient.

[0027] As a preferred option, such as Figure 4 and Figure 5 As shown, a first groove 100 is provided on the first flange 4021, and a second groove 200 is provided on the second flange 501. The first groove 100 and the second groove 200 are joined to form a first accommodating cavity for placing a pressure sensor 7. The pressure sensor 7 is used to detect the pressure between the punching head 5 and the magnesium alloy die-casting part 6. An ultrasonic control box (not shown in the figure) is also connected to the transducer 401. The ultrasonic control box is connected to a PLC controller (not shown in the figure), and the pressure sensor 7 is connected to the PLC controller. Thus, the PLC controller adjusts the control parameters of the ultrasonic control box through the parameters of the pressure sensor 7.

[0028] Specifically, when the PLC controller detects that the pressure sensor 7 is below the first pressure value, the PLC controller controls the ultrasonic control box to increase the output power until the reading of the pressure sensor 7 rises back to the first pressure value; when the PLC controller detects that the pressure sensor 7 is above the second pressure value, the PLC controller controls the ultrasonic control box to reduce the output power, thereby reducing the pressure applied by the punching head 5 to the magnesium alloy die-casting part 6, until the reading of the pressure sensor 7 falls back to the second pressure value.

[0029] As a preferred option, such as Figure 3 As shown, an infrared temperature sensor 8 is fixedly connected to the punching base 2 to detect the temperature between the punching head 5 and the magnesium alloy die-cast part 6. The infrared temperature sensor 8 is connected to the PLC controller, so the PLC controller adjusts the control parameters of the ultrasonic control box through the parameters of the infrared temperature sensor 8; for example... Figure 4 As shown, an acceleration sensor 9 is fixedly connected to the first flange 4021 to detect the three-dimensional vibration state of the punching head 5, focusing on extracting the transverse vibration acceleration data. Thus, the PLC controller adjusts the control parameters of the ultrasonic control box through the parameters of the acceleration sensor 9.

[0030] Specifically, the PLC controller corrects the output power of the ultrasonic control box based on the parameters of the infrared temperature sensor 8; when the PLC controller detects that the infrared temperature sensor 8 is greater than or equal to the first temperature value, the PLC controller controls the ultrasonic control box to reduce the output power; when the PLC controller detects that the infrared temperature sensor 8 is greater than or equal to the second temperature value, the PLC controller controls the ultrasonic control box to cut off the power, and at the same time, the PLC controller controls the drive mechanism to rise.

[0031] Specifically, the PLC controller corrects the output power of the ultrasonic control box based on the parameters of the accelerometer 9; when the PLC controller detects that the lateral vibration of the accelerometer 9 is greater than the first preset value, the PLC controller controls the ultrasonic control box to gradually reduce the output power until the lateral vibration falls back to within the first preset value.

[0032] As a preferred option, such as Figure 6 As shown, a fixing mechanism 101 is provided on the base 1. The fixing mechanism 101 is used to fix the magnesium alloy die-casting part 6 on the base 1. The fixing mechanism 101 includes a retaining edge 1011 fixedly connected to the base 1 and a threaded rod 1012 rotatably connected to the base 1. A sliding stop 1013 is screwed onto the threaded rod 1012. The sliding stop 1013 is screwed onto the threaded rod 1012. By rotating the threaded rod 1012, the sliding stop 1013 moves along the threaded rod 1012 towards the opposite or opposite retaining edge 1011 to clamp or loosen the magnesium alloy die-casting part 6. Two threaded rods 1012 are symmetrically arranged, and the material discharge hole 3 is located between the two threaded rods 1012.

[0033] In one specific embodiment, when the thickness of the magnesium alloy die casting 6 is 5mm and the hardness is HB80, the first pressure value is set to 80N and the second pressure value is set to 120N. The pressure sensor 7 needs to be corrected. The zero value of the pressure sensor 7 is specified as the normal pressure received by the pressure sensor 7 when it is fixed in the first accommodating cavity minus the corrected value. The PLC controller controls the ultrasonic vibration power in the ultrasonic control box. When the pressure sensor 7 detects a value of <80N, the PLC controller controls the ultrasonic control box to increase the power by 50W each time with a step interval of 20ms. This increases the vibration energy of the punching head 5 to enhance the cutting ability of the magnesium alloy die casting 6 until the pressure sensor 7 detects a value of 80N, thus avoiding the generation of burrs due to excessively low pressure. When the pressure sensor 7 detects a value > 120N, the PLC controller controls the ultrasonic control box to reduce the power by 80W each time, with a step interval of 20ms, to reduce the pressure of the punching head 5 on the magnesium alloy die-casting part 6 and avoid the generation of burrs, until the pressure drops back to within 120N.

[0034] Meanwhile, based on the magnesium alloy's ignition point of 500℃, a warning threshold, namely the first temperature value, is set to 280℃, and a safety threshold, namely the second temperature value, is set to 300℃; the PLC controller corrects the output power of the ultrasonic control box based on the first and second temperature values ​​to prevent the magnesium alloy die-casting 6 from burning at high temperatures. When the infrared temperature sensor 8 detects a value ≥280℃, the PLC controller controls the ultrasonic control box to forcibly reduce the power by 30%. This command is not affected by pressure parameters and reduces frictional heat generation. When the infrared temperature sensor 8 detects a value ≥300℃, the PLC controller immediately controls the ultrasonic control box to cut off the power output and simultaneously controls the drive mechanism to lift the punching seat 2, so that the punching head 5 is away from the magnesium alloy die casting 6, thereby blocking heat accumulation and preventing the magnesium alloy die casting 6 from burning or oxidizing due to high temperature.

[0035] Furthermore, a first preset value for lateral vibration is set according to the rigidity of the punching head 5. In this embodiment, a diamond cutting head is used, and the lateral vibration acceleration parameter, i.e., the first preset value, is 5m / s², based on the material properties of diamond. By controlling the lateral vibration frequency of the punching head 5 to not exceed 5m / s², the accuracy of the cut is ensured. When the accelerometer 9 detects a lateral vibration frequency > 5 m / s², the PLC controller controls the ultrasonic control box to reduce the output power by 100W each time, thereby reducing the vibration energy and suppressing the sway of the punch head 5 until the lateral vibration frequency drops back to within 5 m / s². As a preferred option, when the pressure drops below 80N after reducing the power, burrs may occur. It is necessary to wait for the lateral vibration to stabilize before slightly increasing the output power by 30W each time through the PLC controller, thereby balancing the requirements for accuracy and burr-free operation.

[0036] As a preferred option, the priority of the PLC controller in descending order is: temperature parameter, lateral vibration parameter, and pressure sensor parameters. Accuracy and quality should only be adjusted after ensuring safety and stability.

[0037] In this embodiment of the invention, the ultrasonic control box receives the power adjustment command from the PLC controller, converts the mains power into high-frequency AC power through the internal inverter, and precisely controls the output power to achieve linear adjustment of the vibration energy of the punching head 5. Finally, by linking the output power with the three major indicators of pressure, temperature and vibration, a punched product without burrs or rough edges is achieved after the magnesium alloy punching is completed.

[0038] The working principle of this invention is as follows: During the punching process, the magnesium alloy die casting 6 is first placed on the fixing mechanism 101 for fixation. Then, the driving mechanism drives the punching head 5 to move downward. At the same time, the ultrasonic vibration generator 4 generates ultrasonic vibration and transmits it to the punching head 5 through the amplitude transformer 402. Under the action of ultrasonic vibration, the friction between the punching head 5 and the magnesium alloy die casting 6 is reduced, and the punching force distribution is more uniform, thereby achieving burr-free punching. After the punching is completed, the driving mechanism drives the punching head 5 to move upward and remove the punched magnesium alloy die casting 6.

[0039] This invention effectively reduces the generation of burrs during the punching process by subjecting the punching head 5 to ultrasonic vibration, thereby improving the appearance quality and dimensional accuracy of the magnesium alloy die casting 6. It can effectively break the burr root, making burr removal more thorough and improving the product qualification rate. No additional deburring process is required, reducing processing steps and processing time, improving production efficiency, and also reducing production costs.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A punching device for magnesium alloy die castings, characterized in that, The device includes a base, a punching seat slidably connected to the base, a drive mechanism connected to the punching seat, the drive mechanism driving the punching seat to move, an ultrasonic vibration generator installed on the punching seat, a punching cutter head fixedly connected to the ultrasonic vibration generator, and a material discharge hole opened on the base, located directly below the punching cutter head. After the magnesium alloy die casting is fixed on the base, the ultrasonic vibration generator transmits vibration to the punching cutter head, and the punching cutter head punches the magnesium alloy die casting.

2. The magnesium alloy die-casting punching device according to claim 1, characterized in that, The bottom of the punching seat is provided with a receiving groove. The ultrasonic vibration generator includes a transducer, which is connected to the receiving groove. An amplitude transformer is fixedly connected to the transducer, and the end of the amplitude transformer away from the transducer is fixedly connected to the punching head.

3. The magnesium alloy die-casting punching device according to claim 2, characterized in that, A buffer layer is provided at the connection between the receiving tank and the transducer to absorb the vibration transmitted from the amplitude transformer to the transducer.

4. The magnesium alloy die-casting punching device according to claim 2, characterized in that, A first flange is fixedly connected to the amplitude transformer, and a second flange is fixedly connected to the punching head. The first flange and the second flange are connected, thereby fixing the punching head to the ultrasonic vibration generator.

5. The magnesium alloy die-casting punching device according to claim 4, characterized in that, A first groove is formed on the first flange, and a second groove is formed on the second flange. The first groove and the second groove are joined together to form a first accommodating cavity for placing a pressure sensor. The pressure sensor is used to detect the pressure between the punching head and the magnesium alloy die casting. An ultrasonic control box is also connected to the transducer. The ultrasonic control box is connected to a PLC controller, and the pressure sensor is connected to the PLC controller. Thus, the PLC controller adjusts the control parameters of the ultrasonic control box through the pressure sensor parameters.

6. The magnesium alloy die-casting punching device according to claim 5, characterized in that, An infrared temperature sensor is fixedly connected to the punching base to detect the temperature between the punching head and the magnesium alloy die-casting part. The infrared temperature sensor is connected to the PLC controller, so the PLC controller adjusts the control parameters of the ultrasonic control box through the parameters of the infrared temperature sensor. An acceleration sensor is fixedly connected to the first flange to detect the three-dimensional vibration state of the punching head, focusing on extracting the transverse vibration acceleration data. The PLC controller adjusts the control parameters of the ultrasonic control box through the parameters of the acceleration sensor.

7. The magnesium alloy die-casting punching device according to claim 6, characterized in that, When the PLC controller detects that the pressure sensor reading is below the first pressure value, the PLC controller controls the ultrasonic control box to increase the output power until the pressure sensor reading rises back to the first pressure value. When the PLC controller detects that the pressure sensor reading is higher than the second pressure value, the PLC controller controls the ultrasonic control box to reduce the output power and reduce the pressure applied to the magnesium alloy die-casting by the punching head until the pressure sensor reading drops back to the second pressure value.

8. The magnesium alloy die-casting punching device according to claim 7, characterized in that, The PLC controller adjusts the output power of the ultrasonic control box based on the parameters of the infrared temperature sensor. When the PLC controller detects that the infrared temperature sensor value is greater than or equal to the first temperature value, the PLC controller controls the ultrasonic control box to reduce the output power. When the PLC controller detects that the infrared temperature sensor reading is greater than or equal to the second temperature value, the PLC controller controls the ultrasonic control box to cut off the power, and at the same time, the PLC controller controls the drive mechanism to rise.

9. The magnesium alloy die-casting punching device according to claim 7 or 8, characterized in that, The PLC controller corrects the output power of the ultrasonic control box based on the parameters of the acceleration sensor; When the PLC controller detects that the lateral vibration of the accelerometer exceeds the first preset value, the PLC controller controls the ultrasonic control box to gradually reduce the output power until the lateral vibration falls back to within the first preset value.

10. The magnesium alloy die-casting punching device according to claim 1, characterized in that, The base is equipped with a fixing mechanism, which is used to fix the magnesium alloy die-cast parts on the base; The fixing mechanism includes a flange fixedly connected to the base and a threaded rod rotatably connected to the base. A sliding stop is screwed onto the threaded rod, and the sliding stop is screwed onto the threaded rod. Rotating the threaded rod causes the sliding stop to move along the threaded rod towards the flange facing or away from it, so as to clamp or loosen the magnesium alloy die casting. Two threaded rods are symmetrically arranged, and the material discharge hole is located between the two threaded rods.

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