A design method for high-speed stamping die for motor core

Abstract

The present invention discloses a high-speed stamping die for a motor core, comprising an upper die base, a lower die base, and a support assembly. The support assembly is arranged between the upper die base and the lower die base, and the support assembly comprises an upper limit column, a lower limit column, and an elastic member. The upper limit column is arranged at the bottom of the upper die base, and the lower limit column is arranged at the top of the lower die base. The upper limit column and the lower limit column are located on the same vertical line. The elastic member is sleeved on the outer surface of the lower limit column and extends to the outer surface of the upper limit column. The elastic member comprises a spring and a retractor. There are at least two retractors, which are respectively connected to both ends of the spring. A pressure sensor is arranged in the retractor. The pressure sensor can control the operation of the retractor, stretch or release the spring to adjust the spring pitch, and the spring rebound force is applied to the punching machine table to promote the punching machine table to rise, thereby offsetting a certain power loss caused by the punching machine table during operation, thereby improving the power of the die. The present invention also relates to a design method for a high-speed stamping die for a motor core.

Description

Technical Field

[0001] The present invention relates to the technical field of motor iron core processing, and in particular to a design method for a high-speed stamping die for a motor iron core and the stamping die. Background Art

[0002] In the motor industry, the stator and rotor cores are important components of the motor. The technical requirements and dimensional accuracy requirements of the stator and rotor cores are relatively high, and the production batches are relatively large. Generally, motor cores are produced using progressive dies with automatic feeding and automatic stamping.

[0003] The stamping die consists of a punch press and upper and lower die bases. After the lower die base is fixed on the work surface of the punch press, the upper die base is connected to the slider of the punch press using fixings. During stamping, the punch press slider moves left and right in the press toward the workpiece, driving the upper die base downward, applying pressure to the workpiece to cause it to separate or plastically deform. After one stamping is completed, the slider moves upward, and then continues the above steps to perform the next stamping work.

[0004] However, since the upper die seat is fixed to the slider on the table of the punch press by a fixing part, the slider is affected by the upper die seat and moves upward under the load during its upward movement, resulting in an excessively long upward stroke, thereby reducing the overall cycle speed of the punch press. At the same time, since the pressing problem between the upper die seat and the workpiece needs to be considered during the processing of the upper die seat, the position of the workpiece needs to be considered when connecting the upper die seat to the slider on the table of the machine tool, resulting in the upper die seat and the slider not being able to fit without gaps and be set at equal angles. As a result, the workmanship of the punch press cannot be fully applied to the die, resulting in the actual stamping power of the die being far less than the rated power of the punch press. For example, the stamping speed of the T-type die in the prior art is generally 200~400SPM, but the rated stamping speed of the punch press is 1000SPM.

[0005] In summary, due to the reduction in the overall cycle speed of the punch press and the actual punching power applied to the die is far less than the rated power, the punching speed of the stamping die is greatly reduced, resulting in low mold production efficiency and a substantial increase in production costs.

[0006] Therefore, a design method for a high-speed stamping die for a motor core and a stamping die are proposed to solve the above problems. Summary of the Invention

[0007] The present invention overcomes the deficiencies of the prior art and provides a high-speed stamping method for a motor iron core stamping die and a high-speed stamping die.

[0008] To achieve the above object, the present invention adopts the following technical solution: a method for designing a high-speed stamping die for a motor core, comprising the following steps:

[0009] Overall mold design;

[0010] Step 1: Create upper and lower mold base models

[0011] First, force data of the upper and lower die bases of the same power are collected. Then, a single power data model is established using the mean method. Then, multiple different power data models are established using the same upper and lower die base method when selecting upper and lower die bases of different powers. Finally, considering product deformation and design tolerances, multiple different power data are processed to establish upper and lower die base models.

[0012] Step 2: Create a mold base model with support components

[0013] Taking the upper and lower die base models as the basic models, limit columns are added to both the upper and lower die bases. The number of limit columns is limited according to the changes in the pressure values ​​of the upper and lower die bases. When the pressure values ​​of the upper and lower die bases are single, the number of limit columns is reduced, and when the pressure values ​​of the upper and lower die bases are diverse, the number of limit columns is increased. First, support parts are sleeved on the outer surfaces of the upper and lower limit columns according to the height requirements of the upper and lower die bases. Then, according to the process requirements of the mold closing between the upper and lower die bases, the support parts are finally determined to be springs. Then, finite element simulation is performed on the upper and lower limit columns and springs to establish a support component model. Finally, the support component model is spliced ​​and fitted with the upper and lower die base models to form a die base model with support components.

[0014] Specific structural design of support components;

[0015] Step 1: Data Analysis

[0016] Analyze and preliminarily determine the force characteristics and rated reverse force of the support assembly. The main force characteristic of the support assembly is the spring. Based on the upper die base being in an upward position with zero load, the rated reverse force of the spring is equal to the load value applied by the upper die base on the spring.

[0017] Analyze and preliminarily determine the actual reverse force value of the spring. The upper die base is affected by the punching force of the upper punch during operation. The actual reverse force value of the spring is equal to the load force of the upper die base + the punching force of the upper punch.

[0018] Analyze and preliminarily determine how the actual reverse force value is converted into the rated reverse force value. According to the elastic coefficient principle c=f / λ (c: spring stiffness, f: spring load, λ: spring tube deformation under load), f=cλ. Since the spring stiffness c is a fixed value, the f value can be re-determined by re-determining the λ value.

[0019] Analyze and preliminarily determine the λ value to determine the specific structure of the spring. According to: λ=8×(D / d)3×n (D: spring diameter; d: spring wire diameter; n: spring effective coil number), determine the spring body diameter, spring wire diameter, and spring effective coil number of the spring;

[0020] Step 2: Create a spring model

[0021] The spring body diameter is determined based on the height values ​​of the upper and lower die bases. Next, the deformation state of a single model of spring wire under different load conditions is processed to establish a data model for a single model of spring wire. Then, the above method is used to establish data models for multiple models of spring wire. The deformation and design tolerance of the product are comprehensively considered. Finally, the spring model is established by digital model processing of multiple models of spring wire.

[0022] Step 3: Establish a stress model and conduct simulation experiments

[0023] Combined with the spring model in step 2, pressure sensors and retractors are added on both sides of the spring. The spring compression model is designed through UG modeling. At the same time, the pressure sensor is set to meet the maximum required reverse force rating, and then a load simulation experiment is carried out.

[0024] The load force data applied to the spring and the reverse force data after the spring is loaded are used to determine whether the reverse force data after the spring is loaded is appropriate. If the reverse force data does not exceed the preset maximum reverse force rating, it is appropriate; if the reverse force data exceeds the preset maximum reverse force rating, it is inappropriate.

[0025] If it is suitable, the next step is carried out. If it is not suitable, the pressure sensor controls the retractor to pull or release the spring coil to change the effective number of coils of the spring. After the modification is completed, the simulation experiment is continued and the modification is judged until the result is suitable. The effective number of coils and the reverse force rating are statistically analyzed.

[0026] Set different reverse force ratings and repeat the above steps to obtain multiple sets of data relationship values ​​between the effective number of turns and the reverse force ratings;

[0027] Step 4: Finally determine the specific coil value of the pressure sensor controlling the retractor to draw and release the spring through the relationship between multiple sets of effective coils and reverse force ratings;

[0028] According to step one, step two, step three and step four, the optimal design data of the spring is finally determined.

[0029] In a preferred embodiment of the present invention, the specific structural design of the support assembly further includes a limit column structural design;

[0030] Step 1: Analyze and preliminarily determine the force characteristics and force types of the limit column. The main force characteristics of the limit column are the connection end between the limit column and the die base. The force types of the limit column are the vertical blanking force of the punch press and the circumferential vibration force during the spring deformation process.

[0031] Step 2: Establish a limit column model for simulation experiments. Determine the limit column height based on the thickness of the upper and lower die bases. Add a pad at the connection between the limit column and the die base based on the force characteristics and force type of the limit column. Add a shock-absorbing component inside the limit column. Then, design the limit column model through UG modeling, set the maximum blanking force value, and then conduct a load simulation experiment.

[0032] The maximum blanking force value data of the simulation test and the state of the limit column are used to judge whether the set pad thickness value and the performance value of the shock absorber component are appropriate. When the limit column remains stable during blanking, it is appropriate; if the limit column shakes, displaces, or becomes loose, it is inappropriate.

[0033] If it is suitable, determine the optimal design data of the limit column. If it is not suitable, modify the pad thickness and the performance of the shock-absorbing component. After the modification is completed, continue to conduct simulation experiments and make judgments and modifications until the result is judged to be suitable, and finally determine the optimal design data of the limit column.

[0034] In a preferred embodiment of the present invention, the force data collection of the upper die seat specifically includes:

[0035] Fb=F

[0036] So = F / σ

[0037] Where, Fb: maximum force sustained at fracture; So: cross-sectional area; σ: material stress; F: blanking force;

[0038] While ensuring that the upper die seat does not deform under pressure, the data of the minimum cross-section is taken to establish the upper die seat model.

[0039] In a preferred embodiment of the present invention, the overall mold design step further includes designing the output end of the conveyor belt.

[0040] Step 1: Build the output model

[0041] First, based on the characteristics and dimensions of the conveyor belt, UG modeling was used to establish the long strip output end, arc output end, and fan-shaped output end.

[0042] Step 2: Conduct product output simulation experiment

[0043] Preset product output with different conveying volumes, and then conduct product output simulation experiments;

[0044] First, set the product output to 300 pieces / min, and the strip output end, arc output end, and fan-shaped output end all operate normally;

[0045] Continue to increase the product output, set the product output rate to 500 pieces / min, the front end of the long strip output end is blocked and the products cannot be output normally, while the arc output end and the fan-shaped output end are operating normally;

[0046] When the product output is further increased to 800 pieces / min, a large amount of products will accumulate at the arc-shaped output end, and the products on both sides cannot be properly output from the rear end of the output end. However, the fan-shaped output end operates normally.

[0047] Step 3: Make sure the output end of the conveyor belt is an arc-shaped structure.

[0048] Another technical solution adopted by the present invention is: a high-speed stamping die for a motor core, designed by the above-mentioned high-speed stamping die design method for a motor core,

[0049] It includes an upper die base, a lower die base and a support assembly, wherein the support assembly is arranged between the upper die base and the lower die base;

[0050] The support assembly includes an upper limit post, a lower limit post and an elastic member, wherein the upper limit post is arranged at the bottom of the upper die base, the lower limit post is arranged at the top of the lower die base, the upper limit post and the lower limit post are located on the same vertical line, and the elastic member is sleeved on the outer surface of the lower limit post and extends to the outer surface of the upper limit post;

[0051] The elastic member includes a spring and a retractor, and there are at least two retractors, which are respectively connected to both ends of the spring;

[0052] A pressure sensor is provided in the retractor, and the pressure sensor can control the operation of the retractor to stretch or release the spring, thereby adjusting the spring pitch.

[0053] In a preferred embodiment of the present invention, a solenoid valve is provided on the upper die base drawer cylinder.

[0054] In a preferred embodiment of the present invention, the upper die seat buckle points are of equal height structures.

[0055] In a preferred embodiment of the present invention, a cover plate is provided on the top of the upper die base screw plug.

[0056] In a preferred embodiment of the present invention, the punch cutting edge of the upper die base and the concave fixing plate of the lower die base are both provided with oil cooling devices.

[0057] In a preferred embodiment of the present invention, a guide column with a roller-type retaining ring is provided between the upper die base and the lower die base, and the guide column is made of a wear-resistant material.

[0058] In a preferred embodiment of the present invention, the components constituting the limiting column include a pad, a column and a shock absorbing member. The shock absorbing member is installed in the column and the pad is installed on the force-bearing surface of the column.

[0059] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0060] The present invention provides a method for designing a high-speed stamping die for a motor core.

[0061] The upper die base is supported on the lower die base by a component, thereby changing the working mode of the upper die base being connected to the punching machine table in the prior art to a mode in which the upper die base can be separated from the punching machine table to work, so that the punching machine table will not be affected by the upper die base during the upward movement and is in a zero-load upward state, thereby greatly improving the overall cycle speed of the punching machine;

[0062] At the same time, since the upper die base is separated from the punch press table, during installation, only the pressing between the upper die base and the workpiece needs to be considered, without considering whether the upper die base and the punch press table are in contact and at equal angles. Therefore, as long as the punch press table can be pressed onto the upper die base during the work process, the rated power of the punch press can be converted into the actual power of the stamping die with almost no loss, achieving consistency between the stamping speed of the stamping die and the stamping speed of the punch press, thereby greatly improving the stamping speed of the stamping die.

[0063] By designing the elastic member as a spring with a retractor installed at the end, the force of the spring's rebound under pressure can be applied to the punch table, promoting the punch table to rise, thereby offsetting a certain amount of power loss caused by the punch table during operation, ensuring the consistency between the actual power of the punch press and the rated power. At the same time, the retractor is provided to change the number of effective coils and pitch of the spring so that the spring force value is always maintained within a certain range, avoiding excessive spring force when the pressure applied by the upper table is too large, resulting in excessive punching speed during the rising process of the upper die base and the punch table, thereby causing loosening or damage of components.

[0064] By increasing the overall cycle speed of the punch press and reducing the loss of the stamping die during the actual working process, the actual power of the stamping die is almost consistent with the power of the punch press, which greatly improves the production efficiency of the die and significantly reduces its production cost.

[0065] The present invention improves the production efficiency of the mold by increasing the punching speed of the stamping mold.

[0066] As the punching speed increases, continuing to use conventional stamping dies in the prior art will bring about a series of production and parts problems. The present invention makes a series of improvements to the various parts of the stamping die in the prior art to obtain a new stamping die that can meet the operation and product delivery requirements of high-speed stamping dies.

[0067] The present invention adopts the high-speed stamping die designed by the motor core high-speed stamping die design method,

[0068] While greatly improving the punching speed of the stamping die, since it is not connected to the punching machine table, it is not restricted by the punching machine table during installation and can be installed on all types of punching machines, thereby increasing the applicability of the stamping die and making disassembly and maintenance more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] The present invention will be further described below with reference to the accompanying drawings and examples;

[0070] Figure 1 This is a flow chart of a high-speed stamping die design method according to a preferred embodiment of the present invention;

[0071] Figure 2 is a cross-sectional view of a high-speed stamping die according to a preferred embodiment of the present invention;

[0072] Figure 3 is a schematic structural diagram of an elastic member in a preferred embodiment of the present invention;

[0073] Figure 4 This is a schematic diagram of the upper limit column structure of a preferred embodiment of the present invention;

[0074] Figure 5 1 is a top view of an upper die base of a high-speed stamping die according to a preferred embodiment of the present invention;

[0075] Figure 6 This is a schematic diagram of the screw plug structure of a preferred embodiment of the present invention;

[0076] Figure 7 2. It is a schematic diagram of the buckle point structure of a preferred embodiment of the present invention;

[0077] Figure 8 It is a top view of the lower die base of the high-speed stamping die of the preferred embodiment of the present invention.

[0078] Figure 9 It is a curved slide rail of a preferred embodiment of the present invention;

[0079] Figure 10 This is a schematic diagram of the small guide post structure of a preferred embodiment of the present invention;

[0080] Figure 11 It is a schematic diagram of the large guide column structure of a preferred embodiment of the present invention.

[0081] In the figure: 1, upper die base; 12, draw plate; 120, solenoid valve; 121, cylinder; 13, screw plug; 130, cover plate; 14, buckle point; 15, punch;

[0082] 2. Lower die base; 22. Concave fixing plate; 23. Discharging track; 230. Arc slide rail;

[0083] 3. Support assembly; 31. Upper limit column; 310. Pad; 311. Column; 312. Shock absorber; 32. Lower limit column; 33. Elastic member; 330. Spring; 331. Retractor;

[0084] 4. Guide pin; 41. Retaining ring. DETAILED DESCRIPTION

[0085] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0086] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be another intermediate component through which it is fixed. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0087] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0088] A method for designing a high-speed stamping die for a motor core comprises the following steps: overall die design,

[0089] Step 1: Create upper and lower die base 2 models,

[0090] First, force data of the upper and lower die bases 2 of the same power are collected, and then a single power data model is established using the mean method. Then, multiple different power data models are established using the same method for upper and lower die bases 2 of different powers. Finally, considering the product deformation and design tolerance, multiple different power data are processed to establish the upper and lower die base 2 models.

[0091] Step 2: Create a mold base model with support component 3.

[0092] The upper and lower die base 2 models are used as the basic models, and limit columns are added to the upper and lower die bases 2. The number of limit columns is limited according to the changes in the pressure values ​​of the upper and lower die bases 2. When the pressure values ​​of the upper and lower die bases 2 are single, the number of limit columns is reduced. When the pressure values ​​of the upper and lower die bases 2 are diverse, the number of limit columns is increased. First, support parts are sleeved on the outer surfaces of the upper and lower limit columns 32 according to the height requirements of the upper and lower die bases 2, and then the support parts are finally determined to be springs 330 according to the process requirements of the mold closing between the upper and lower die bases 2. Then, finite element simulation is performed on the upper and lower limit columns 32 and the spring 330 to establish a support component 3 model. Finally, the support component 3 model is spliced ​​and fitted with the upper and lower die base 2 models to form a die base model with a support component 3.

[0093] By designing the support assembly 3 to support the upper die base 1 on the lower die base 2, the working mode of the upper die base 1 connected to the punching machine table in the prior art is changed to that the upper die base 1 can work separately from the punching machine table, so that the punching machine table will not be affected by the upper die base 1 during the upward movement and is in a zero-load upward state, thereby greatly improving the overall cycle speed of the punching machine. Specifically,

[0094] The actual traction force of the punch press table during the upward movement is changed by the connection method. Originally, the actual traction force F of the punch press table during the upward movement = F rated traction force + G upper die base 1. Now, the actual traction force F of the punch press table during the upward movement = F rated traction force - F rebound force. Since P = VF, the power P of the punch press is a fixed value, the change in traction now leads to a change in speed, V = P / (F rated traction force - F rebound), and the punching speed increases during the upward movement of the punch press table.

[0095] Specific structural design of support component 3;

[0096] Step 1: Data Analysis

[0097] Analyze and preliminarily determine the force characteristics and rated reverse force value of the support assembly 3. The main force characteristic of the support assembly 3 is the spring 330. Based on the premise that the upper die base 1 is in an upward position with zero load, the rated reverse force value of the spring 330 is equal to the load value applied by the upper die base 1 on the spring 330.

[0098] Analyze and preliminarily determine the actual reverse force value of the spring 330. The upper die base 1 is affected by the punching force of the upper punch during operation. The actual reverse force value of the spring 330 is equal to the load force of the upper die base 1 + the punching force of the upper punch.

[0099] Analyze and preliminarily determine how the actual reverse force value is converted into the rated reverse force value. According to the elastic coefficient principle c=f / λ (c: stiffness of spring 330, f: load force on spring 330, λ: deformation of the elastic tube under load), f=cλ. Since the stiffness value c of spring 330 is a fixed value, the f value is re-determined by re-determining the λ value.

[0100] Analyze and preliminarily determine the λ value to determine the specific structure of the spring 330. According to: λ=8×(D / d)3×n (D: spring 330 diameter; d: spring 330 wire diameter; n: spring effective coil number), determine the spring 330 body diameter, spring 330 wire diameter, and spring 330 effective coil number of the spring 330.

[0101] Step 2: Create a spring 330 model

[0102] The diameter of the spring 330 body is determined according to the height values ​​of the upper and lower die bases 2. Secondly, the deformation state of a single model of spring 330 wire under different load states is processed to establish a data model of a single model of spring 330 wire. Then, the above method is used to establish data models of multiple models of spring 330 wire. The deformation and design tolerance of the product are comprehensively considered. Finally, the spring 330 model is established by digital model processing of multiple models of spring 330 wire.

[0103] Step 3: Establish a stress model and conduct simulation experiments

[0104] Combined with the spring 330 model in step 2, pressure sensors and retractors 331 are added to both sides of the spring 330. The spring 330 compression model is designed through UG modeling. At the same time, the pressure sensor is set to meet the maximum required reverse force rating, and then a load simulation experiment is carried out.

[0105] The load force data applied to the spring 330 and the reverse force data after the spring 330 is subjected to the force are used to determine whether the reverse force data after the spring 330 is subjected to the force is appropriate. If the reverse force data does not exceed the preset maximum reverse force rating, it is appropriate; if the reverse force data exceeds the preset maximum reverse force rating, it is inappropriate.

[0106] If it is suitable, the next step is carried out. If it is not suitable, the pressure sensor controls the retractor 331 to work, pulling or releasing the spring 330, changing the effective number of coils of the spring 330. After the modification is completed, the simulation experiment is continued and the modification is judged until the result is suitable. The effective number of coils and the reverse force rating are statistically analyzed.

[0107] Set different reverse force ratings and repeat the above steps to obtain multiple sets of data relationship values ​​between the effective number of turns and the reverse force ratings;

[0108] Step 4: The specific number of turns for the pressure sensor to control the retractor 331 to pull and release the spring 330 is finally determined based on the data relationship between multiple sets of effective turns and reverse force ratings;

[0109] According to step 1, step 2, step 3 and step 4, the optimal design data of the spring 330 is finally determined.

[0110] In a preferred embodiment of the present invention, the specific structural design of the support assembly 3 also includes a limit column structural design;

[0111] Step 1: Analyze and preliminarily determine the force characteristics and force types of the limit column. The main force characteristics of the limit column are the connection end between the limit column and the die base. The force types of the limit column are the vertical blanking force of the punch press and the circumferential vibration force during the deformation of the spring 330.

[0112] Step 2: Build a limit column model for simulation experiments. Determine the limit column height based on the thickness of the upper and lower die bases 2. Add a pad 310 to the connection between the limit column and the die base based on the force characteristics and force type of the limit column. Add a shock-absorbing component inside the limit column. Then, design the limit column model using UG modeling, set the maximum blanking force value, and then conduct a load simulation experiment.

[0113] The maximum blanking force data from the simulation test and the state of the limit column are used to determine whether the set thickness of the pad 310 and the performance value of the shock absorber are appropriate. If the limit column remains stable during blanking, it is appropriate; if the limit column shakes, moves, or becomes loose, it is not appropriate.

[0114] If it is suitable, determine the optimal design data of the limit column. If it is not suitable, modify the thickness of the pad 310 and the performance of the shock-absorbing component. After the modification is completed, continue to perform simulation experiments and make judgments and modifications until the result is judged to be suitable, and finally determine the optimal design data of the limit column.

[0115] In a preferred embodiment of the present invention, the force data collection of the upper die base 1 specifically includes:

[0116] The different blanking forces applied by the punch press on the upper die base 1 and the different cross-sectional areas corresponding to the upper die base 1 are collected. The design data of the cross-sectional area of ​​the upper die base 1 is:

[0117] Fb=F

[0118] So = F / σ

[0119] Where, Fb: maximum force sustained at fracture; So: cross-sectional area; σ: material stress; F: blanking force;

[0120] While ensuring that the upper die base 1 does not deform under pressure, the data of the minimum cross-section is taken to establish the upper die base 1 model.

[0121] In a preferred embodiment of the present invention, the overall mold design step further includes the design of the conveyor belt output end.

[0122] Step 1: Build the output model

[0123] First, based on the characteristics and dimensions of the conveyor belt, UG modeling was used to establish the long strip output end, arc output end, and fan-shaped output end.

[0124] Step 2: Conduct product output simulation experiment

[0125] Preset product output with different conveying volumes, and then conduct product output simulation experiments;

[0126] First, set the product output to 300 pieces / min, and the strip output end, arc output end, and fan-shaped output end all operate normally;

[0127] Continue to increase the product output, set the product output rate to 500 pieces / min, the front end of the long strip output end is blocked and the products cannot be output normally, while the arc output end and the fan-shaped output end are operating normally;

[0128] When the product output is further increased to 800 pieces / min, a large amount of products will accumulate at the arc-shaped output end, and the products on both sides cannot be properly output from the rear end of the output end. However, the fan-shaped output end operates normally.

[0129] Step 3: Make sure the output end of the conveyor belt is an arc-shaped structure.

[0130] Another technical solution adopted by the present invention is: a high-speed stamping die for a motor core, designed by the above-mentioned high-speed stamping die design method for a motor core,

[0131] It includes an upper die base 1, a lower die base 2 and a support assembly 3. The support assembly 3 is arranged between the upper die base 1 and the lower die base 2. The upper die base 1 is separated from the upper table of the punch press. During installation, you only need to consider the pressing problem between the upper die base 1 and the workpiece, and there is no need to consider whether the upper die base 1 and the upper table of the punch press are in contact with each other and whether the angles are equal. Therefore, as long as it is ensured that the upper table of the punch press can be pressed on the upper die base 1 during the work process, the rated power of the punch press can be converted into the actual power of the stamping die with almost no loss, and the consistency between the stamping speed of the stamping die and the stamping speed of the punch press is achieved, which greatly improves the actual stamping speed of the stamping die. At the same time, since it is not connected to the upper table of the punch press, it is not restricted by the upper table of the punch press during installation and can be installed on all types of punch presses, thereby improving the applicability of the stamping die and making disassembly and maintenance more convenient.

[0132] The support assembly 3 includes an upper limit column 31, a lower limit column 32 and an elastic member 33. The upper limit column 31 is arranged at the bottom of the upper die base 1, and the lower limit column 32 is arranged at the top of the lower die base 2. The upper limit column 31 and the lower limit column 32 are located on the same vertical line. The elastic member 33 is sleeved on the outer surface of the lower limit column 32 and extends to the outer surface of the upper limit column 31. The elastic member 33 includes a spring 330 and a retractor 331. There are at least two retractors 331, which are respectively connected to the two ends of the spring 330. The components constituting the elastic member 33 include a spring 330 and a retractor 331. By designing the elastic member 33 as a spring 330 with a retractor 331 installed at the end, the force of the spring 330 rebounding under pressure can be applied to the punching machine table, promoting the punching machine table to rise, thereby offsetting the power loss caused by the punching machine table during operation, and ensuring the consistency between the actual power of the punching machine and the rated power.

[0133] A pressure sensor is provided in the retractor 331. The pressure sensor can control the operation of the retractor 331 to stretch or release the spring 330, thereby adjusting the pitch of the spring 330. Specifically, a pressure rating is first set on the pressure sensor as an initial value according to the die punch speed power. When the impact pressure on the spring 330 is greater than the rated value, the pressure sensor drives the retractor 331 to pull the spring 330, thereby expanding the pitch between the coils of the spring 330. When the impact pressure on the spring 330 is less than the rated value, the pressure sensor drives the retractor 331 to release the spring 330, thereby reducing the pitch between the coils of the spring 330. Specifically,

[0134] By changing the effective number of coils and pitch of the spring 330, the elastic force of the spring 330 is always maintained within a certain range, so as to avoid excessive elastic force of the spring 330 when the pressure applied by the upper table is too large, causing the upper die base 1 and the upper table of the punch press to rise too fast, thereby causing components to become loose or damaged.

[0135] In a preferred embodiment of the present invention, a solenoid valve 120 is provided on the cylinder 121 of the draw plate 12 of the upper die base 1, and the battery valve originally provided on the table top of the punch press is changed to be provided on the cylinder 121 of the draw plate 12 of the upper die base 1. Since the upper die base 1 is not connected to the table top of the punch press, the solenoid valve 120 provided on the crossbeam of the table top of the punch press can be removed. At the same time, since the stamping speed of the mold is increased, the speed of the draw plate 12 also needs to be increased accordingly. Therefore, the solenoid valve 120 can be provided on the cylinder 121 of the draw plate 12 to increase the response speed of the draw plate 12.

[0136] In a preferred embodiment of the present invention, the buckling points 14 of the upper die base 1 are of equal height structures.

[0137] In a preferred embodiment of the present invention, a cover plate 130 is provided on the top of the screw plug 13 of the upper die base 1. Since the upper table of the punching machine and the upper die base 1 are not connected by fixing parts, there will be a gap. When the punching speed is very fast, there will be a risk of the screw plug 13 jumping up. Now, the additional cover plate 130 is used to avoid this risk.

[0138] In a preferred embodiment of the present invention, an oil cooling device is provided on the cutting edge end of the punch 15 of the upper die base 1 and the concave fixing plate 22 of the lower die base 2. Specifically, an oil cooling device is added to the cutting edge end of the punch 15 of the upper die base 1. Due to the fast punching speed, the cutting edge end of the punch 15 will heat up. The upper die cutting edge is cooled by adding oil to cool the cutting edge to cool the cutting edge faster. An oil cooling device is added to the concave fixing plate 22 of the lower die base 2. Due to the high-speed stamping effect, the plate will cause heat, so the concave fixing plate 22 of the lower die base 2 needs to be cooled. The oil cooling method is faster.

[0139] In a preferred embodiment of the present invention, a guide column 4 having a roller-type retaining ring 41 is provided between the upper die base 1 and the lower die base 2. The material of the guide column 4 is a wear-resistant material. Due to high-speed stamping between the upper and lower die bases 2, the traditional material of the guide column 4 can no longer meet its requirements, and it is necessary to change it to a wear-resistant material to increase its service life. The ball-type retaining ring 41 on the guide column 4 is changed to a roller-type retaining ring 41, thereby increasing the force-bearing area of ​​the guide column 4 and changing the original point-type force to a linear force, thereby better meeting the force requirements of the guide column 4 under high-speed stamping.

[0140] In a preferred embodiment of the present invention, the components constituting the limiting column include a pad 310, a column 311 and a shock absorber 312. The shock absorber 312 is installed in the column 311 and the pad 310 is installed on the force-bearing surface of the column 311. The shock absorber 312 is installed in the column 311 to prevent the column 311 from being affected during the stamping process, and the pad 310 is installed on the force-bearing surface of the column 311 to divide the force applied to the column 311, thereby increasing the service life of the column 311.

[0141] The above embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patented invention. It should be noted that those skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention. These variations and improvements are equivalent modifications and improvements to the above embodiments based on the essential technology of the present invention and fall within the scope of protection of the present invention.

Claims

1. A method for designing a high-speed stamping die for a motor core, characterized in that: The mold includes the following structures: An upper die base, a lower die base, and a support assembly, wherein the support assembly is arranged between the upper die base and the lower die base; The support assembly includes an upper limit post, a lower limit post and an elastic member, wherein the upper limit post is arranged at the bottom of the upper die base, the lower limit post is arranged at the top of the lower die base, the upper limit post and the lower limit post are located on the same vertical line, and the elastic member is sleeved on the outer surface of the lower limit post and extends to the outer surface of the upper limit post; The elastic member includes a spring and a retractor, and there are at least two retractors, which are respectively connected to both ends of the spring; A pressure sensor is provided in the retractor, and the pressure sensor can control the operation of the retractor to stretch or release the spring, thereby adjusting the effective number of coils of the spring; The design includes the following steps: Overall mold design: Step 1: Create upper and lower mold base models First, the force data of the upper and lower mold bases with the same power are collected, and then the mean value method is used to establish a single A power data model is created. Then, multiple different power data models are created by selecting upper and lower mold bases of different powers and using the same upper and lower mold bases. Finally, considering the product deformation and design tolerance, multiple different power data are processed to create upper and lower mold base models. Step 2: Create a mold base model with support components Taking the upper and lower die base models as the basic models, limit columns are added to both the upper and lower die bases. The number of limit columns is limited according to the changes in the pressure values ​​of the upper and lower die bases. When the pressure values ​​of the upper and lower die bases are single, the number of limit columns is reduced, and when the pressure values ​​of the upper and lower die bases are diverse, the number of limit columns is increased. First, support parts are sleeved on the outer surfaces of the upper and lower limit columns according to the height requirements of the upper and lower die bases. Then, according to the process requirements of the mold closing between the upper and lower die bases, the support parts are finally determined to be springs. Then, finite element simulation is performed on the upper and lower limit columns and springs to establish a support component model. Finally, the support component model is spliced ​​and fitted with the upper and lower die base models to form a die base model with support components. Specific structural design of support components: Step 1: Data Analysis Analyze and preliminarily determine the force characteristics and rated reverse force of the support assembly. The main force characteristic of the support assembly is the spring. Based on the upper die base being in an upward position with zero load, the rated reverse force of the spring is equal to the load value applied by the upper die base on the spring. Analyze and preliminarily determine the actual reverse force value of the spring. The upper die base is affected by the punching force of the upper punch during operation. The actual reverse force value of the spring is equal to the load force of the upper die base + the punching force of the upper punch. Analyze and preliminarily determine how the actual reverse force value is converted into the rated reverse force value. According to the elastic coefficient principle c=f / λ (c: spring stiffness, f: spring load, λ: spring tube deformation under load), f=cλ. Since the spring stiffness c is a fixed value, the f value can be re-determined by re-determining the λ value. Analyze and preliminarily determine the λ value to determine the specific structure of the spring, according to: λ=8×(D / d) 3 ×n (D: spring diameter; d: spring wire diameter; n: number of effective spring coils), determine the spring body diameter, spring wire diameter, and number of effective spring coils; Step 2: Create a spring model The spring body diameter is determined based on the height values ​​of the upper and lower die bases. Next, the deformation state of a single model of spring wire under different load conditions is processed to establish a data model for a single model of spring wire. Then, the above method is used to establish data models for multiple models of spring wire. The deformation and design tolerance of the product are comprehensively considered. Finally, the spring model is established by digital model processing of multiple models of spring wire. Step 3: Establish a stress model and conduct simulation experiments Combined with the spring model in step 2, pressure sensors and retractors are added on both sides of the spring. The spring compression model is designed through UG modeling. At the same time, the pressure sensor is set to meet the maximum required reverse force rating, and then a load simulation experiment is carried out. The load force data applied to the spring and the reverse force data after the spring is loaded are used to determine whether the reverse force data after the spring is loaded is appropriate. If the reverse force data does not exceed the preset maximum reverse force rating, it is appropriate; if the reverse force data exceeds the preset maximum reverse force rating, it is inappropriate. If it is suitable, the next step is carried out. If it is not suitable, the pressure sensor controls the retractor to pull or release the spring coil to change the effective number of coils of the spring. After the modification is completed, the simulation experiment is continued and the modification is judged until the result is suitable. The effective number of coils and the reverse force rating are statistically analyzed. Set different reverse force ratings and repeat the above steps to obtain multiple sets of data relationship values ​​between the effective number of turns and the reverse force ratings; Step 4: Finally determine the specific coil value of the pressure sensor controlling the retractor to draw and release the spring through the relationship between multiple sets of effective coils and reverse force ratings; According to step one, step two, step three and step four of the specific structural design of the support component, the optimal design data of the spring is finally determined.

2. A method for designing a high-speed stamping die for a motor core according to claim 1, wherein The characteristic is that: the specific structural design of the support assembly also includes the structural design of the limit column; Step 1: Analyze and preliminarily determine the force characteristics and force types of the limit column. The main force characteristics of the limit column are the connection end between the limit column and the die base. The force types of the limit column are the vertical blanking force of the punch press and the circumferential vibration force during the spring deformation process. Step 2: Establish a limit column model for simulation experiments. Determine the limit column height based on the thickness of the upper and lower die bases. Add a pad at the connection between the limit column and the die base based on the force characteristics and force type of the limit column. Add a shock-absorbing component inside the limit column. Then, design the limit column model through UG modeling, set the maximum blanking force value, and then conduct a load simulation experiment. The maximum blanking force value data of the simulation test and the state of the limit column are used to judge whether the set pad thickness value and the performance value of the shock absorber component are appropriate. When the limit column remains stable during blanking, it is appropriate; if the limit column shakes, displaces, or becomes loose, it is inappropriate. If it is suitable, determine the optimal design data of the limit column. If it is not suitable, modify the pad thickness and the performance of the shock-absorbing component. After the modification is completed, continue to conduct simulation experiments and make judgments and modifications until the result is judged to be suitable, and finally determine the optimal design data of the limit column.

3. The method for designing a high-speed stamping die for a motor core according to claim 1, wherein The characteristic is that the force data collection of the upper die seat specifically includes: The different blanking forces exerted by the punch press on the upper die base and the different cross-sectional areas corresponding to the upper die base are collected. The design data of the cross-sectional area of ​​the upper die base is: ， Where, Fb: maximum force sustained at fracture; So: cross-sectional area; σ: material stress; F: blanking force; While ensuring that the upper die seat does not deform under pressure, the data of the minimum cross-section is taken to establish the upper die seat model.

4. A method for designing a high-speed stamping die for a motor core according to claim 1, wherein The feature is that the overall mold design step also includes the design of the conveyor belt output end. Step 1: Build the output model First, based on the characteristics and dimensions of the conveyor belt, UG modeling was used to establish the long strip output end, arc output end, and fan-shaped output end. Step 2: Conduct product output simulation experiment Preset product output with different conveying volumes, and then conduct product output simulation experiments; First, set the product output to 300 pieces / min, and the strip output end, arc output end, and fan-shaped output end all operate normally; Continue to increase the product output, set the product output rate to 500 pieces / min, the front end of the long strip output end is blocked and the products cannot be output normally, while the arc output end and the fan-shaped output end are operating normally; When the product output is further increased to 800 pieces / min, a large amount of products will accumulate at the arc-shaped output end, and the products on both sides cannot be properly output from the rear end of the output end. However, the fan-shaped output end operates normally. Step 3: Make sure the output end of the conveyor belt is an arc-shaped structure.

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