Auxiliary demolding method for diffusion ring of air inlet channel of unmanned aerial vehicle
By selecting an appropriate pneumatic hammer and accessing a demolding force calibration database, the problem of deformation accumulation in the diffuser ring of the UAV air intake during demolding was solved, achieving efficient and reliable demolding and avoiding mold damage.
Patent Information
- Application Number
- CN202511883887.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-01-23
AI Technical Summary
The deformation accumulation of the diffuser ring in the air intake of the UAV during the demolding process leads to inaccurate experimental results, affecting the selection of working air pressure for the air hammer equipment and mold wear, thus reducing demolding efficiency.
By acquiring the attribute information of the workpiece to be demolded and the product mold, the corresponding specification of the air hammer equipment is selected, and the demolding force calibration database is called up. The air hammer equipment is controlled to perform demolding operation according to the target air pressure parameters and the target number of hammer blows, so as to avoid deformation accumulation and ensure accurate demolding.
This improved the demolding efficiency and quality of the diffuser ring in the UAV air intake, avoided mold damage, and ensured accurate working air pressure selection for the air hammer equipment.
Smart Images
Figure CN121374935A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application generally relates to the technical field of unmanned aerial vehicle air inlet diffuser ring auxiliary demolding, and particularly relates to an unmanned aerial vehicle air inlet diffuser ring auxiliary demolding method. BACKGROUND
[0002] In the process of manufacturing the unmanned aerial vehicle air inlet diffuser ring, manual demolding is relatively inconvenient during demolding, and therefore, unmanned aerial vehicle air inlet diffuser ring auxiliary demolding automation equipment is widely used.
[0003] In the mold experiment of the unmanned aerial vehicle air inlet diffuser ring auxiliary demolding automation equipment, deformation accumulation may cause inaccurate results through a specific mechanism: each time the force applied to the mold is knocked, elastic deformation or plastic deformation may be triggered, and the plastic deformation is continuously accumulated, which is specifically manifested in the continuous change of the axial diameter and height of the mold, and the deterioration of the reinstallation of the threaded hole; and this deformation accumulation changes the initial state of the mold in the experimental sequence, so that the deformation measurement value of the subsequent experiment contains the cumulative effect of the previous time, for example, after the low working air pressure test, the mold has been slightly deformed, and when the high working air pressure test is performed subsequently, the deformation response may be amplified or distorted, finally distorting the relationship between the working air pressure and the deformation parameter, and unable to accurately reflect the real effect under each air pressure, which affects the selection of the air hammer equipment on the working air pressure in the actual application, cannot avoid the damage to the mold, and also reduces the demolding efficiency of the unmanned aerial vehicle air inlet diffuser ring. SUMMARY
[0004] In view of the above defects or deficiencies in the prior art, it is desirable to provide an unmanned aerial vehicle air inlet diffuser ring auxiliary demolding method.
[0005] The present application provides an unmanned aerial vehicle air inlet diffuser ring auxiliary demolding method, which is applied to a demolding equipment, and the method comprises the following steps: Obtaining attribute information of a workpiece to be demolded in the current demolding process and specification information of a product mold matched with the workpiece to be demolded, and selecting a corresponding air hammer equipment according to the attribute information and the specification information; Placing the workpiece to be demolded on the demolding equipment and setting the air hammer equipment correspondingly; Obtaining a product mold model in the specification information, and calling a demolding force calibration database according to the product mold model to obtain target air pressure parameters and target hammering times corresponding to the product mold model; the demolding force calibration database is established through a demolding force calibration test; Based on the target air pressure parameters and the target hammering times, controlling the air hammer equipment to perform corresponding demolding operations to apply corresponding demolding forces to the workpiece to be demolded, and assisting the workpiece to be demolded to separate from the product mold outside.
[0006] According to the technical scheme provided by the application, the attribute information at least includes: the minimum demolding resistance between the workpiece to be demolded and the product mold; and the specification information at least includes: the hammering area of the product mold and the maximum hammering force that can be borne.
[0007] According to the technical scheme provided by the application, the demolding force calibration test establishment process comprises the following steps: Setting a test sample, the test sample at least includes: test product molds of different models, test air hammer equipment of different models; each group of the test product molds is internally formed with a test demolding workpiece of the same type; According to the attribute information of the test demolding workpiece in the test and the product information of the test air hammer equipment, test initial air hammer parameters are calculated; According to the test initial air hammer parameters and a preset number of hammering times, the test air hammer equipment is controlled to perform a demolding test on the test product mold, and through the result of the demolding test, the standard air pressure parameters and the standard number of hammering times of each test air hammer equipment corresponding to the test product mold are confirmed.
[0008] According to the technical scheme provided by the application, the product information at least includes: air hammer rated air pressure and air hammer rated maximum output force; according to the attribute information of the test demolding workpiece in the test and the product information of the test air hammer equipment, test initial air hammer parameters are calculated: The test demolding workpiece in the test and the test air hammer equipment are taken as a target test demolding workpiece and a target test air hammer equipment; the minimum demolding resistance between the target test demolding workpiece and the external product mold thereof and the air hammer rated air pressure and the air hammer rated maximum output force of the target test air hammer equipment are obtained; According to the minimum demolding resistance, the air hammer rated air pressure and the air hammer rated maximum output force, test initial air hammer parameters are calculated.
[0009] According to the technical scheme provided by the application, according to the test initial air hammer parameters and a preset number of hammering times, the test air hammer equipment is controlled to perform a demolding test on the test product mold, and through the result of the demolding test, the standard air pressure parameters and the standard number of hammering times corresponding to the test product mold and different test air hammer equipment are confirmed, so as to construct a demolding force calibration database, which comprises: The target test air hammer equipment is controlled to hammer the target test demolding workpiece according to the test initial air hammer parameters, and whether the target test demolding workpiece is demolded in the hammering process is judged; If the target test demolding workpiece is not demolded after the number of hammering times reaches the preset number of hammering times, the test initial air hammer parameters are adjusted upwards, and a retest after the test initial air hammer parameters are adjusted upwards is entered; If the target test demolding workpiece has been demolded in the hammering process and the number of hammering is less than or equal to the preset number of hammering, a test deformation parameter of a test product mold outside the target test demolding workpiece is acquired; when the test deformation parameter is in a preset range, the current test initial air hammer parameter and the current number of hammering are taken as the standard air pressure parameter and the standard number of hammering corresponding to the test product mold and the target test air hammer equipment.
[0010] According to the technical scheme provided by the application, the retest after the up-regulated test initial air hammer parameter comprises the following steps: The test initial air hammer parameter and a pressure safety threshold of the target test air hammer equipment are acquired, and a test pressure increase is calculated according to the test initial air hammer parameter and the pressure safety threshold. A first test air hammer parameter is calculated based on the test pressure increase and the test initial air hammer parameter, and the target test air hammer equipment is controlled to hammer the target test demolding workpiece according to the first test air hammer parameter.
[0011] According to the technical scheme provided by the application, after the test deformation parameter of the test product mold outside the target test demolding workpiece is acquired, the following steps are further included: When the test deformation parameter is not in the preset range, the test initial air hammer parameter is adjusted downward, and then a retest after the down-regulated test initial air hammer parameter is entered.
[0012] According to the technical scheme provided by the application, the retest after the down-regulated test initial air hammer parameter comprises the following steps: The test initial air hammer parameter and a minimum reliable air pressure of the target test air hammer equipment are acquired, and a test pressure decrease is calculated according to the test initial air hammer parameter and the minimum reliable air pressure. A second test air hammer parameter is calculated based on the test pressure decrease and the test initial air hammer parameter, and the target test air hammer equipment is controlled to hammer the target test demolding workpiece according to the second test air hammer parameter.
[0013] In summary, the technical scheme specifically discloses an unmanned aerial vehicle air inlet passage diffuser ring auxiliary demolding method, which comprises the following steps: obtaining attribute information of a workpiece to be demolded in a current demolding process and specification information of a product mold matched with the workpiece to be demolded, and selecting a corresponding air hammer device according to the attribute information and the specification information; placing the workpiece to be demolded on a demolding device and setting the air hammer device correspondingly; obtaining a product mold type in the specification information, and calling a demolding force calibration database according to the product mold type to obtain target air pressure parameters and target hammering times corresponding to the product mold type; the demolding force calibration database is established through a demolding force calibration test; and based on the target air pressure parameters and the target hammering times, the air hammer device is controlled to perform corresponding demolding operations to apply corresponding demolding forces to the workpiece to be demolded, so as to separate the workpiece to be demolded from the product mold outside the workpiece to be demolded.
[0014] The existing demolding device cannot accurately reflect the real effect of hammering under each air pressure due to improper test and neglect of the error caused by deformation accumulation, so that the air hammer device cannot accurately perform demolding operations; in the present application, after the air hammer device of a suitable specification is selected, the corresponding target air pressure parameters and target hammering times can be obtained through the mold type of the current product mold by querying the demolding force calibration database, and finally the air hammer device is controlled to perform demolding operations according to the target air pressure parameters and the target hammering times to separate the workpiece to be demolded from the product mold outside the workpiece to be demolded; the method not only guarantees the efficiency and reliability of the demolding of the unmanned aerial vehicle air inlet passage diffuser ring, but also avoids damage to the product mold during the demolding process, thereby prolonging the service life of the product mold. BRIEF DESCRIPTION OF DRAWINGS
[0015] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings: Figure 1 FIG. 1 is a flowchart of an unmanned aerial vehicle air inlet passage diffuser ring auxiliary demolding method.
[0016] Figure 2 FIG. 2 is a structural schematic diagram of an unmanned aerial vehicle air inlet passage diffuser ring auxiliary demolding device.
[0017] Figure 3 FIG. 3 is a working condition schematic diagram of an unmanned aerial vehicle air inlet passage diffuser ring auxiliary demolding device.
[0018] In the drawings: 1, device support; 2, placement platform; 21, through hole; 3, air hammer installation module. DETAILED DESCRIPTION
[0019] The application will be described in further detail below with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not intended to limit the scope of the application. In addition, it should be noted that only parts related to the application are shown in the drawings for ease of description.
[0020] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. The application will be described in further detail below with reference to the drawings and embodiments.
[0021] Embodiment 1 In order to make the technical solutions of the embodiments of the application more clear and easy to understand, the application background of the embodiments of the application is introduced below.
[0022] The unmanned aerial vehicle inlet passage diffuser ring is a core functional component of the unmanned aerial vehicle inlet passage system, is installed between the inlet passage inlet and the engine compressor (or combustion chamber), and is a bridge connecting the external airflow and the engine air supply demand. The core role of the unmanned aerial vehicle inlet passage diffuser ring is to "decelerate, pressurize and straighten" the airflow entering the engine through specific structural design, to ensure that the engine obtains stable and efficient inlet conditions, which directly affects the power performance, endurance and flight safety of the unmanned aerial vehicle, so the structural design of the unmanned aerial vehicle inlet passage diffuser ring needs to strictly match the airflow regulation and control demand, and a designed mold needs to be used when forming, but due to the complex inner shape and high cavity fit, manual demolding cannot break through the physical limitation of the tight engagement of the mold and the workpiece.
[0023] The demolding equipment refers to a special tooling equipment for assisting the separation of the unmanned aerial vehicle inlet passage diffuser ring from the product mold, which usually integrates a pneumatic hammer installation module, a workpiece positioning tooling, a gas pressure control system and a program control unit, can provide stable support for the pneumatic hammer, and ensure the precise alignment of the workpiece and the pneumatic hammer through the positioning structure; the pneumatic hammer installation module here includes a pneumatic hammer equipment, which uses compressed air as a power source and generates impact force or thrust through reciprocating motion of a piston; in actual application process, the switch of the demolding equipment can be started to control the pneumatic hammer equipment to automatically hammer the product mold, so as to separate the glass fiber layer of the unmanned aerial vehicle inlet passage diffuser ring, and realize the function of auxiliary demolding. The operating parameter information of the pneumatic hammer equipment needs to match the pressure and speed demand of the demolding process.
[0024] Based on the above introduction of the demolding equipment, the working pressure of the demolding equipment needs to be determined according to the gas pressure of the on-site gas source and the parameters of the selected air hammer. The working pressure can meet the needs of demolding and cannot cause the deformation of the mold. The determination of the working pressure is generally carried out by manual experiment. The on-site working pressure is gradually adjusted from small to large, and it is observed whether the mold can be demolded, and the deformation parameters of the mold after demolding are detected. Finally, a suitable on-site working pressure is selected from the experiment as the working pressure of the mold.
[0025] The above-mentioned mode ignores the phenomenon that the deformation accumulation will cause inaccurate results through a specific mechanism. The gradual adjustment of the working pressure will change the initial state of the mold in the experimental sequence, so that the deformation measurement value of the subsequent experiment contains the cumulative effect of the previous experiment. For example, after testing at a low working pressure, the mold has been slightly deformed. When testing at a high working pressure, the deformation response may be amplified or distorted, finally distorting the relationship between the working pressure and the deformation parameter, and cannot accurately reflect the real effect under each pressure, thereby affecting the selection of the demolding automatic equipment on the working pressure.
[0026] Therefore, the present application provides an unmanned aerial vehicle inlet passage diffusion ring auxiliary demolding method. The method comprises the following steps: selecting a corresponding specification of air hammer equipment according to the pressure and speed required by the current demolding process; placing the workpiece to be demolded on the demolding equipment and corresponding to the air hammer equipment; obtaining the product mold used by the workpiece to be demolded in the demolding process, and calling the demolding force calibration database according to the model of the product mold to obtain the corresponding target pressure parameter and target hammering times; based on the target pressure parameter and the target hammering times, controlling the air hammer equipment to perform corresponding demolding work to apply corresponding demolding force to the workpiece to be demolded, and assisting the workpiece to be demolded to separate from the external product mold. As can be seen, by selecting a corresponding specification of air hammer equipment and calling the calibration database, the demolding equipment directly outputs the pressure parameter of the air hammer equipment when performing the task and the number of times the product mold needs to be hammered this time, which can ensure smooth demolding of the workpiece to be demolded and avoid obvious damage to the product mold caused by excessive impact force, effectively improving the demolding speed and quality of the unmanned aerial vehicle inlet passage diffusion ring.
[0027] In order to make the technical scheme of the present application clearer and easier to understand, the unmanned aerial vehicle inlet passage diffusion ring auxiliary demolding method provided by the embodiment of the present application will be introduced below with reference to the accompanying drawings. As shown in Figure 1 , Figure 2 The flowchart of the unmanned aerial vehicle inlet passage diffusion ring auxiliary demolding method provided by the embodiment of the present application is shown in the figure. The execution subject of the method can be a demolding equipment; please refer to Figure 1 The structural flowchart of the unmanned aerial vehicle inlet passage diffusion ring auxiliary demolding method provided by the embodiment of the present application is shown in the figure, which comprises: S100: Obtain the attribute information of the workpiece to be demolded in the current demolding process and the specification information of the product mold that matches the workpiece to be demolded, and select the corresponding pneumatic hammer equipment according to the attribute information and specification information. First, taking the demolding workpiece as a diffuser ring for a drone's air intake as an example, the demolding process will be briefly explained: Step 1, Product mold preparation, cleaning and inspection of the product mold: thoroughly clean the mold surface to ensure that there is no dust, oil, mold release agent residue or debris from previous demolding, and check whether the mold surface is smooth and free of defects. Step 2, applying release agent: Apply a suitable release agent (such as wax-based, PVA solution, semi-permanent release agent, etc.) evenly to the working surface of the mold. This is a crucial step. Step 3, Material Preparation: Based on the shape, size, and layup design of the component (which determines the component's strength, stiffness, and thickness), cut the carbon fiber dry cloth or prepreg into the required shape and size; Step 4, Resin Mixing: Mix resin (usually epoxy resin, polyester or vinyl ester is also commonly used) and curing agent / accelerator 5 in precise proportions; Lay-up includes: laying the cut first layer of carbon fiber cloth into the mold, ensuring that its position is correct, the fiber direction meets the design requirements, and it fits the mold surface as closely as possible. Step 5, Curing: After the layup is completed, allow the component to cure statically in the mold; Step 6, Demolding: Before attempting demolding, make sure the resin has fully cured.
[0028] Therefore, different product molds are required for different specifications of drone air intake diffuser rings. So, when performing the demolding process, it is necessary to select the corresponding specification of air hammer equipment based on the attribute information of the workpiece to be demolded and the specification information of the product mold. On the one hand, it is necessary to ensure that the specifications of the air hammer equipment and the product mold are matched. On the other hand, it is also necessary to ensure that the air hammer equipment can provide a hammering working mode to ensure the smooth demolding of the drone air intake diffuser ring. The hammering working mode here can be understood as the target air pressure parameters and target hammering number required by the air hammer equipment.
[0029] Further, the attribute information at least includes: the minimum demolding resistance between the workpiece to be demolded and the product mold; and the specification information at least includes: the hammering area of the product mold and the maximum hammering force that the product mold can bear. According to the attribute information and the specification information, the specific process of selecting the corresponding specification of the air hammer equipment is: obtaining the hammering area of the product mold, the minimum demolding resistance between the workpiece to be demolded and the product mold, and the maximum hammering force that the product mold can bear; and selecting the corresponding specification of the air hammer equipment according to the hammering area of the product mold, the minimum demolding resistance between the workpiece to be demolded and the product mold, and the maximum hammering force that the product mold can bear.
[0030] The hammering area of the product mold is the area of the region that the product mold can provide for the air hammer equipment to hammer; The maximum hammering force that the product mold can bear is not a fixed value, and is related to the material properties, structural design, and key part strength of the product mold, and is an inherent attribute of different product molds; The minimum demolding resistance between the workpiece to be demolded and the product mold is calculated according to the following formula (1): Formula (1); Wherein, represents the minimum demolding resistance between the workpiece to be demolded and the product mold; represents the gripping force of the material shrinkage on the product mold; represents the additional force of the material cold welding or lubricant residue; Further, the gripping force and the additional force can be calculated by the following formula (2) and formula (3), respectively: Formula (2); Formula (3); Wherein, represents the unit area adhesion, which is related to the material compatibility of the workpiece, and generally can be ; represents the actual contact area of the material and the product mold; represents the elastic modulus of the workpiece material; represents the contact perimeter of the workpiece and the product mold; represents the linear expansion coefficient of the workpiece material; represents the temperature change of the solidification / cooling of the workpiece to be demolded.
[0031] After obtaining the hammering area of the product mold and the minimum demolding resistance between the workpiece to be demolded and the product mold, when selecting the air hammer equipment, it is necessary to ensure that the following three conditions are met: Condition 1: The area of the hammering end face of the air hammer equipment is smaller than or equal to the hammering area of the product mold; Condition 2: the rated minimum output force of the air hammer of the air hammer device is less than the maximum hammering force that the product mold can withstand; Condition 3: the rated maximum output force of the air hammer of the air hammer device is greater than the minimum demolding resistance between the workpiece to be demolded and the product mold.
[0032] It should be noted that since the air inlet diffuser rings of various types of unmanned aerial vehicles have undergone demolding tests, the air hammer device used after the demolding process for different types of workpieces to be demolded can be directly determined in daily use. In order to avoid the impact of the idle state of the air hammer device on demolding, a type of workpiece to be demolded can correspond to multiple air hammer devices that meet the conditions for working pressure calibration, and the specific calibration is not specially limited.
[0033] S200, placing the workpiece to be demolded on the demolding device and corresponding to the air hammer device; After the air hammer device is selected, the workpiece to be demolded can be placed on the demolding device, and the air hammer device and the workpiece to be demolded are corresponded, so that the air hammer device can hammer the product mold outside the workpiece to be demolded.
[0034] The structure of the demolding device can be seen in Figure 2 and Figure 3 The demolding device includes a device support 1, which is the support of the entire demolding device, and a placement platform 2 is arranged in the middle of the device support 1. The placement platform 2 is used to place the workpiece to be demolded. At the same time, a through hole 21 is arranged in the middle of the placement platform 2, which can facilitate the demolding of the workpiece. In addition, an air hammer installation module 3 is arranged above the placement platform 2, which includes an air hammer device for hammering the workpiece to be demolded placed on the placement platform 2. The workpiece to be demolded can be seen in the mark A in Figure 3 It should be noted that the air hammer device 3 is controlled by the control system of the demolding device, and the control system can drive the air hammer device 3 to output a specified hammering force by controlling the air pressure intensity. In addition, the demolding device in the embodiment of the application is also provided with a shock-absorbing storage device at the bottom of the device support 1, so as to avoid the damage caused by the direct impact of the metal product mold on the ground during demolding. The shock-absorbing storage device can be a shock-absorbing material such as sponge placed in the device support 1 to reduce the impact force, which will not be described here.
[0035] S300, obtaining the product mold type in the specification information, and calling a demolding force calibration database according to the product mold type to obtain target air pressure parameters and target hammering times corresponding to the product mold type; the demolding force calibration database is established through a demolding force calibration test; S400, based on the target air pressure parameter and the target hammering times, control the air hammer device to perform corresponding demolding operation to apply corresponding demolding force to the workpiece to be demolded to assist the workpiece to be demolded to separate from the product mold outside.
[0036] Under the corresponding air hammer device, by obtaining the product mold model contained in the specification information of the product mold at the moment, the target air pressure parameter and the target hammering times corresponding thereto can be obtained in the demolding force calibration database, so that the air hammer device is controlled to perform corresponding demolding operation according to the target air pressure parameter and the target hammering times, and corresponding demolding force is applied to the workpiece to be demolded, so that the workpiece to be demolded can be smoothly demolded, and at the same time, the product mold is not excessively deformed in the hammering process.
[0037] The above-mentioned target air pressure parameter is used to reflect the hammering force applied by the corresponding specification air hammer device to the product mold at a time, and the target air pressure parameter is the air pressure intensity released by the air source connected to the air hammer device; the target hammering times is used to reflect the number of times the product mold needs to be hammered by the air hammer device based on the target air pressure parameter, so as to separate the workpiece to be demolded from the product mold outside.
[0038] It needs to be explained here that the demolding force calibration database only considers the model of the product mold because the type of the workpiece to be demolded in the current demolding process is the inlet diffuser ring of the unmanned aerial vehicle, so after the product mold is known, the corresponding target air pressure parameter and target hammering times can be obtained, without the need to analyze the type of the workpiece in the product mold.
[0039] Next, the structure example and establishment process of the aforementioned "demolding force calibration database" will be described: (1) The structure example of the demolding force calibration database corresponding to any air hammer device is shown in Table 1 as follows.
[0040] Table 1 Structure example of demolding force calibration database
[0041] Among them, ABC123, ABC113, ABC143 and ABC173 respectively represent the product mold model that the current air hammer device can perform demolding auxiliary operation, a 1 to a 4 represent the target air pressure parameters corresponding to each product mold model; b 1 to b 4 represent the target hammering times corresponding to each product mold model and target air pressure parameter.
[0042] (2) The establishment process of the demolding force calibration test includes the following steps: Step A1, set the test sample, the test sample at least includes: different models of test product molds, different models of test air hammer equipment; each group of test product molds is internally formed with a test demolding workpiece of the same type; In the calibration test of the demolding force database, the product mold commonly used by the current unmanned aerial vehicle inlet diffuser ring is used, which is recorded as a test product mold; each test product mold is internally formed with a corresponding model of unmanned aerial vehicle inlet diffuser ring, which is recorded as a test demolding workpiece; each air hammer equipment of the commonly used model in the test is recorded as a test air hammer equipment.
[0043] It should be noted that after the test sample is set, the test environment needs to be good, the product mold and the air hammer equipment need to be well-structured and clean, and the like, which will not be described in detail here.
[0044] Step A2, according to the attribute information of the test demolding workpiece in the test and the product information of the test air hammer equipment, the test initial air hammer parameter is calculated ; the product information at least includes: air hammer rated air pressure and air hammer rated maximum output force; In the traditional test process, the starting point is selected by experience, which may need to be tested multiple times to approach the best air pressure range, for example, 0.3 MPa is tested first, and then 0.5 MPa is tested, each time increasing by 0.2 MPa, but the standard air pressure parameter is about 0.4 MPa, so the experience-based starting point selection method is seriously wasted and results in deviation. In the embodiment of the present application, an intelligent search algorithm (bisection method, golden section method or model predictive control method) is used to select the test initial air hammer parameter , instead of blind trial and error, to find the standard air pressure parameter in the test.
[0045] Next, the process of step A2 specifically includes: taking the test demolding workpiece and the test air hammer equipment in the test as a target test demolding workpiece and a target test air hammer equipment; obtaining the minimum demolding resistance between the target test demolding workpiece and its external product mold and the air hammer rated air pressure and the air hammer rated maximum output force of the target test air hammer equipment; according to the minimum demolding resistance, the air hammer rated air pressure and the air hammer rated maximum output force, the test initial air hammer parameter is calculated .
[0046] Since multiple test demolding workpieces, test product molds and test air hammer equipment are used in the calibration test of the demolding force database, and the principles and processes of the test are basically the same, here a certain test demolding workpiece and a certain test air hammer equipment in the test are taken as a target test demolding workpiece and a target test air hammer equipment for description.
[0047] Firstly, the minimum demolding resistance of the target test demolding workpiece is obtained, which is recorded as ; the rated air pressure of the air hammer refers to the normal safe working air pressure of the air hammer equipment specified by the air hammer equipment manufacturer, and is a core parameter for safe and stable operation of the air hammer, denoted as ; the rated maximum output force of the air hammer refers to the maximum thrust or impact force that the air hammer equipment can output under the upper limit of the rated air pressure, and is used to reflect the upper limit of the output of the air hammer equipment, denoted as . The above data can be obtained by calculation and the factory information of the air hammer equipment.
[0048] Finally, according to the minimum demolding resistance of the target test demolding workpiece , the rated air pressure of the air hammer and the rated maximum output force of the air hammer , the test initial air hammer parameter is calculated by the following formula (4); Formula (4); , wherein represents the minimum demolding resistance of the target test demolding workpiece; represents the rated air pressure of the air hammer; represents the rated maximum output force of the air hammer; represents a safety factor, which is usually 0.6-0.8, leaving adjustment space.
[0049] It should be noted that the above formula (4) calculates the percentage of the minimum force required to complete the demolding task to the maximum capacity of the air hammer, and then converts the proportional relationship to the actual air pressure unit, thereby setting the test initial air hammer parameter, avoiding blind setting of the test initial condition.
[0050] Step A3, according to the test initial air hammer parameter and the preset number of hammering, control the test air hammer equipment to perform demolding test on the test product mold, and through the result of the demolding test, confirm the standard air pressure parameter and the standard number of hammering corresponding to the test product mold and different test air hammer equipment, thereby constructing a demolding force calibration database.
[0051] The test initial air hammer parameter The target test air hammer device is driven to operate according to the preset hammering times (here, the preset hammering times are default values, not fixed limits), so that the target test air hammer device hammers the test product mold to exert the demolding force on the test product mold. During the whole process, the state of the target test demolding workpiece in the demolding test needs to be observed, so as to confirm the standard air pressure parameter and the standard hammering times of the target test air hammer device corresponding to the test product mold outside the target test demolding workpiece; finally, different test demolding workpieces and test air hammer devices are selected as the target test demolding workpiece and the target test air hammer device in the same way, and the standard air pressure parameter and the standard hammering times corresponding to different test product molds and different test air hammer devices are confirmed, so as to construct a demolding force calibration database. The demolding force calibration database can be stored in the corresponding air hammer device based on the target test air hammer device in the calibration test data; during use, after the air hammer installation module 3 is started, the corresponding standard air pressure parameter and standard hammering times can be obtained according to the product mold model stored in the demolding force calibration database.
[0052] It should be noted that, in order to ensure the smooth progress of the test, the limit hammering times need to be set in the test, for example, 10 times, which is not limited in detail; the hammering times are related to the demolding efficiency on the one hand, and also related to reducing the deformation damage on the other hand, because the fewer the hammering times, the higher the demolding efficiency will be, and in the case of reducing the deformation damage of the product mold and maintaining the demoldable workpiece, the fewer the hammering times are naturally better.
[0053] The process of step A3 specifically includes: controlling the target test air hammer device to hammer the target test demolding workpiece according to the test initial air hammer parameter, and judging whether the target test demolding workpiece is demolded during the hammering process; The air hammer device is controlled to hammer the target test demolding workpiece according to the test initial air hammer parameter, and at the same time, whether the target test demolding workpiece is demolded during the hammering process is observed, which is explained as follows in two cases: Case one: if the target test demolding workpiece is not demolded after the hammering times reach the preset hammering times, the test initial air hammer parameter is adjusted upwards, and the retest after the test initial air hammer parameter is adjusted upwards is entered. Case one indicates that the current selected test initial air hammer parameter is too small, which leads to that the target test demolding workpiece is not successfully demolded under the preset hammering times, and due to the efficiency problem, the hammering times are not increased, but the test initial air hammer parameter is adjusted upwards, and the retest after the test initial air hammer parameter is adjusted upwards is entered.
[0054] Specifically, the retest after the test initial air hammer parameter is adjusted upwards includes the following steps: Step C1, obtaining the initial air hammer parameters of the test, the pressure safety threshold of the target test air hammer device, and calculating the test pressure increase according to the initial air hammer parameters of the test and the pressure safety threshold; Step C2, based on the test pressure increase and the initial air hammer parameters of the test, the first test air hammer parameters are calculated; control the target test air hammer device to hammer the target test demolding workpiece according to the first test air hammer parameters.
[0055] The pressure safety threshold of the target test air hammer device refers to the theoretical maximum allowable air pressure, denoted as , which can be obtained from the factory information of the air hammer device; finally, the test pressure increase can be calculated according to the following formula (5): Formula (5); , wherein is a dynamic adjustment coefficient, usually set to 0.5-1, determined by the risk factor; is the remaining allowed search steps, usually set to 2-3 steps.
[0056] Next, the first test air hammer parameters can be calculated according to the following formula (6): Formula (6).
[0057] Finally, after obtaining the first test air hammer parameters , the test can be performed again, and the target test air hammer device needs to be controlled to hammer the target test demolding workpiece, at which time the air pressure parameters that the target test air hammer device needs to execute are the first test air hammer parameters , and then it still needs to be judged whether the target test demolding workpiece is demolded within the preset number of hammering times. If it fails to demold, the step of adjusting the initial air hammer parameters of the test is cycled, but the initial air hammer parameters of the test as the basis for adjustment at this time should be the first test air hammer parameters, and the test is cycled until the standard air pressure parameters and the standard hammering times corresponding to the test product mold and the target test air hammer device are confirmed, that is, until the hammering times and the test air hammer parameters that can demold within the preset hammering times and ensure that the test deformation parameters are within the preset range are calibrated.
[0058] Case two: if the target test demolding workpiece has been demolded during the hammering process and the number of hammering times is less than or equal to the preset number of hammering times, the test deformation parameters of the test product mold outside the target test demolding workpiece are obtained; when the test deformation parameters are within the preset range, the current initial air hammer parameters of the test and the current number of hammered times are taken as the standard air pressure parameters and the standard hammering times corresponding to the test product mold and the target test air hammer device.
[0059] Specifically, if the target test demolding workpiece is demolded within the preset number of hammering, it proves that the currently selected test initial air hammer parameters are sufficient to make the target test demolding workpiece demold smoothly, but further test deformation parameters of the test product mold need to be tested to determine whether the current hammering brings burden to the test product mold. The test deformation parameters are, for example, size deformation, surface damage, and structural integrity data. For example, the preset range of height change is set to 0-0.03 mm in the embodiment of the present application. If the height change of the test product mold exceeds the range, it is determined that the test deformation parameters are not within the preset range, and vice versa. When it is found that the test deformation parameters are within the preset range, it proves that the current product mold is not damaged in the hammering process, and the current test initial air hammer parameters and the current number of hammering can be used as the standard air pressure parameters and the standard number of hammering corresponding to the test product mold and the target test air hammer equipment.
[0060] It should be noted that the number of hammering here refers to the real-time number of hammering when it is found that the target test demolding workpiece is demolded in the process of hammering the target test demolding workpiece by the target test air hammer equipment with the test initial air hammer parameters, rather than the preset number of hammering. For example, the target test demolding workpiece is demolded when the target test air hammer equipment hammers for the fifth time, and the test deformation parameters also meet the requirements. Therefore, the standard air pressure parameters of the test product mold corresponding to the target test demolding workpiece for the target test air hammer equipment are the test initial air hammer parameters, and the standard number of hammering is five.
[0061] In addition, after obtaining the test deformation parameters of the test product mold outside the target test demolding workpiece, the method further includes: when the test deformation parameters are not within the preset range, adjusting the test initial air hammer parameters downward, and then entering a retest after the test initial air hammer parameters are adjusted downward.
[0062] The above case indicates that although the test initial air hammer parameters can make the target test demolding workpiece demold smoothly, such hammering causes damage to the product mold. Therefore, the test initial air hammer parameters need to be adjusted downward, and then a retest after the test initial air hammer parameters are adjusted downward is entered.
[0063] Specifically, the retest after the test initial air hammer parameters are adjusted downward includes the following steps: Step R1, obtaining the test initial air hammer parameters, the minimum reliable air pressure of the target test air hammer equipment, and calculating a test pressure reduction amount based on the test initial air hammer parameters and the minimum reliable air pressure; Step R2, calculating a second test air hammer parameter based on the test pressure reduction amount and the test initial air hammer parameters, and controlling the target test air hammer equipment to hammer the target test demolding workpiece according to the second test air hammer parameter.
[0064] The minimum reliable air pressure of the target test air hammer device is an empirically estimated value, is a scale of downward adjustment based on the initial air hammer parameters of the test, can be set according to experience, and is finally calculated by the following formula (7) to obtain the test pressure reduction : Formula (7); Wherein, is a deformation sensitivity coefficient, which can generally be taken as 0.3-0.7, P safe_min is the minimum reliable air pressure.
[0065] Next, the second test air hammer parameters can be directly calculated by the following formula (8) : Formula (8).
[0066] Finally, after obtaining the test pressure reduction , it is still necessary to perform a test again, and the test also needs to control the target test air hammer device to hammer the target test demolding workpiece according to the second test air hammer parameters, and the air pressure parameters that the target test air hammer device needs to execute at this time are the second test air hammer parameters , and then it is still necessary to judge whether the target test demolding workpiece is demolded during the hammering process, and to monitor the test deformation parameters of the test product mold after demolding, until the standard data that meets the demolding requirements of the target test demolding workpiece and does not cause excessive loss to the test product mold is obtained, the standard air pressure parameters and the standard hammering times corresponding to the test product mold and the target test air hammer device are obtained, and this process will not be described in more detail.
[0067] Based on the above description, the present application proposes an unmanned aerial vehicle inlet diffusion ring auxiliary demolding method, which comprises the following steps: selecting a corresponding specification of air hammer device according to the required pressure and speed of the current demolding process; placing the workpiece to be demolded on the demolding device and corresponding to the air hammer device; obtaining the product mold used by the workpiece to be demolded in the demolding process, and calling the demolding force calibration database according to the model of the product mold to obtain the target air pressure parameters and the target hammering times corresponding to the model; based on the target air pressure parameters and the target hammering times, controlling the air hammer device to perform corresponding demolding operation to apply corresponding demolding force to the workpiece to be demolded, and assisting the workpiece to be demolded to separate from the product mold outside.
[0068] It can be seen that, on the one hand, the method first selects the corresponding specification air hammer according to the attribute information of the workpiece to be demolded and the specification information of the product mold matched with the workpiece to be demolded, and then obtains the target air pressure parameter and the target hammering number matched with the product mold model by using the demolding force calibration database established by the standardized and dynamic demolding force calibration test, so as to quickly control the demolding equipment to perform the demolding operation, effectively realize the adaptation of the air hammer equipment and the demolding demand, guarantee the efficiency and reliability of the demolding, avoid the damage of the mold, prolong the service life of the mold, adapt different models of product molds and air hammer equipment, and finally ensure the quality consistency and process flexibility of the unmanned aerial vehicle inlet diffusion ring in batch demolding.
[0069] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.
Claims
1. A method for assisted demolding of a diffuser ring in the air intake of an unmanned aerial vehicle (UAV), characterized in that, The method is applied to a demolding device, and the method comprises the following steps: Obtaining attribute information of a workpiece to be demolded in a current demolding process and specification information of a product mold matched with the workpiece to be demolded, and selecting a corresponding air hammer device according to the attribute information and the specification information; Placing the workpiece to be demolded on the demolding device and setting the air hammer device correspondingly; Obtaining a product mold type in the specification information, and calling a demolding force calibration database according to the product mold type to obtain target air pressure parameters and target hammering times corresponding to the product mold type; the demolding force calibration database is established through a demolding force calibration test; Based on the target air pressure parameters and the target hammering times, the air hammer device is controlled to perform corresponding demolding operations to apply corresponding demolding forces to the workpiece to be demolded, thereby assisting the workpiece to be demolded to separate from the product mold outside.
2. The unmanned aerial vehicle inlet duct diffuser ring assisted demolding method according to claim 1, characterized in that, The attribute information at least comprises minimum demolding resistance between the workpiece to be demolded and the product mold; and the specification information at least comprises a hammering area of the product mold and a maximum hammering force that can be borne.
3. The unmanned aerial vehicle inlet duct diffuser ring assisted demolding method according to claim 1, characterized in that, The demolding force calibration test establishment process comprises the following steps: Setting test samples, wherein the test samples at least comprise test product molds of different types and test air hammer devices of different types; and each group of the test product molds is internally formed with a test demolding workpiece of the same type; According to attribute information of the test demolding workpiece in the test and product information of the test air hammer device, test initial air hammer parameters are calculated; According to the test initial air hammer parameters and a preset hammering time, the test air hammer device is controlled to perform a demolding test on the test product mold, and through a result of the demolding test, standard air pressure parameters and standard hammering times corresponding to the test product mold and different test air hammer devices are confirmed, thereby establishing a demolding force calibration database.
4. The unmanned aerial vehicle inlet duct diffuser ring assisted demolding method according to claim 3, characterized in that, The product information at least comprises air hammer rated air pressure and air hammer rated maximum output force; according to attribute information of the test demolding workpiece in the test and product information of the test air hammer device, test initial air hammer parameters are calculated, including: Taking the test demolding workpiece in the test and the test air hammer device as a target test demolding workpiece and a target test air hammer device; obtaining minimum demolding resistance between the target test demolding workpiece and a product mold outside the target test demolding workpiece and air hammer rated air pressure and air hammer rated maximum output force of the target test air hammer device; According to the minimum demolding resistance, the air hammer rated air pressure and the air hammer rated maximum output force, test initial air hammer parameters are calculated.
5. The unmanned aerial vehicle inlet duct diffuser ring assisted demolding method according to claim 4, characterized in that, According to the test initial air hammer parameters and a preset hammering time, the test air hammer device is controlled to perform a demolding test on the test product mold, and through a result of the demolding test, standard air pressure parameters and standard hammering times corresponding to the test product mold and different test air hammer devices are confirmed, thereby establishing a demolding force calibration database, including: Controlling the target test air hammer device to hammer the target test demolding workpiece according to the test initial air hammer parameters, and judging whether the target test demolding workpiece is demolded in the hammering process; If the target test demolding workpiece has not been demolded after the hammering number reaches the preset hammering number, the test initial air hammer parameter is adjusted upward, and a retest after the test initial air hammer parameter is adjusted upward is entered; If the target test demolding workpiece has been demolded in the hammering process and the hammering number is less than or equal to the preset hammering number, a test deformation parameter of a test product mold outside the target test demolding workpiece is obtained; when the test deformation parameter is in a preset range, the current test initial air hammer parameter and the current hammered number are taken as standard air pressure parameters and a standard hammering number corresponding to the test product mold and the target test air hammer equipment.
6. The unmanned aerial vehicle inlet duct diffuser ring assisted demolding method according to claim 5, characterized in that, The retest after the test initial air hammer parameter is adjusted upward includes the following steps: The test initial air hammer parameter, a pressure safety threshold of the target test air hammer equipment are obtained, and a test pressure increase amount is calculated according to the test initial air hammer parameter and the pressure safety threshold; A first test air hammer parameter is calculated based on the test pressure increase amount and the test initial air hammer parameter; the target test air hammer equipment is controlled to hammer the target test demolding workpiece according to the first test air hammer parameter.
7. The unmanned aerial vehicle inlet duct diffuser ring assisted demolding method according to claim 5, characterized in that, After the test deformation parameter of the test product mold outside the target test demolding workpiece is obtained, the following steps are further included: When the test deformation parameter is not in the preset range, a retest after the test initial air hammer parameter is adjusted downward is entered.
8. The unmanned aerial vehicle inlet duct diffuser ring assisted demolding method according to claim 7, characterized in that, The retest after the test initial air hammer parameter is adjusted downward includes the following steps: The test initial air hammer parameter, a minimum reliable air pressure of the target test air hammer equipment are obtained, and a test pressure decrease amount is calculated according to the test initial air hammer parameter and the minimum reliable air pressure; A second test air hammer parameter is calculated based on the test pressure decrease amount and the test initial air hammer parameter; the target test air hammer equipment is controlled to hammer the target test demolding workpiece according to the second test air hammer parameter.