CN112692169A - Deep drawing forming die for box-shaped part of rolled differential thick plate - Google Patents
Deep drawing forming die for box-shaped part of rolled differential thick plate Download PDFInfo
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
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Abstract
The invention discloses a die suitable for drawing and forming a rolled differential thick plate box-shaped piece, which is applied to the technical field of plate drawing dies and comprises a drawing die part and a hydraulic control part, wherein a drawing die main body comprises a stepped male die, a female die, a blocked blank holder, a die gap adjusting device and the like, and the hydraulic control part mainly comprises a pump, a valve, a measurement and control instrument and the like. The drawing device can realize drawing of the box-shaped part of the differential thick plate, and can obtain the high-quality differential thick plate box-shaped part by controlling reasonable matching of side pressure forces applied to the thin side and the thick side of the differential thick plate. The invention has the advantages of simple structure, low production cost, convenient replacement of the punch and the die, flexible adjustment of the blank holder gap, high stamping efficiency and good part quality.
Description
Technical Field
The invention relates to the technical field of plate drawing dies, in particular to a die for drawing and forming a box-shaped part of a rolled differential thickness plate.
Background
Rolled differential thickness slabs (TRB) are lightweight structural slabs produced by the flexible rolling technique and developed in the 20 th century 90 s at the metal forming Institute (IBF) of aachen industry university, germany. The flexible rolling technology can realize real-time monitoring, control and adjustment of the roller gap in the rolling process, and further obtain the variable cross-section shape customized in advance along the rolling direction. Designers can select the optimized section profile of the plate according to the actual stress condition of the part, thereby greatly improving the design flexibility.
Compared with a laser Tailor Welded Blank (TWB), the TRB has unique advantages in the aspects of mechanical performance, weight reduction effect, surface quality, production cost and the like, and can play a great role in the field of automobiles by replacing TWBs with the same material, the same width and different thicknesses. The TRB is applied to the manufacturing of automobile parts, the light weight level of the automobile industry can be further improved, energy conservation and emission reduction are realized, and the development of the automobile industry is assisted.
The box-shaped part is a common stamping part, has regular geometric shape and is widely applied. The forming tool belongs to a representative part which is difficult to form in non-axisymmetric parts, and is taken as a target part to research the forming performance of the TRB, so that the forming rule of the TRB is obtained ideally. The most prominent problem in the deep drawing process after applying TRBs to the box-shaped piece is that, in addition to the cracking and wrinkling defects, the non-uniformity of the sheet thickness and the mechanical properties also causes the shift of the thickness transition zone. Due to the differences of the thin and thick side plates of the TRB and the performance, and the influence of the movement of the transition region, the deformation process of the TRB becomes more complicated, and the uneven deformation of the thin and thick sides of the TRB makes the forming of the whole part more difficult. Therefore, by comprehensively considering the factors, the drawing die suitable for the differential thick plate box-shaped part is designed, the high-quality differential thick plate part is obtained, the forming characteristics and the forming mechanism of the differential thick plate box-shaped part are mastered, and the drawing die has important significance for promoting the wide application of the differential thick plate drawing part in the automobile industry.
Disclosure of Invention
The invention aims to provide a die suitable for drawing and forming a rolled differential thick plate box-shaped part, realize drawing and forming of the differential thick plate box-shaped part and lay a foundation for die design and manufacture of large-scale complex differential thick plate parts in the future.
The technical scheme adopted by the invention is as follows: a die suitable for drawing a rolled differential thick plate box-shaped part is suitable for drawing the rolled differential thick plate box-shaped part and comprises the following components: the device comprises a male die, a first edge pressing block, a second edge pressing block, a female die base and a hydraulic control system; the first edge pressing block and the second edge pressing block are located on the male die, a differential thick plate is placed on the upper surface of the female die base, the first edge pressing block and the second edge pressing block are both in contact with the differential thick plate and provide edge pressing force, and the hydraulic control system applies hydraulic force to the first edge pressing block and the second edge pressing block so as to provide edge pressing force required for forming for thin and thick side plates of the differential thick plate.
The male die is in a step shape, and the surface of the male die can be well attached to the surface of the differential thickness plate, so that the forming performance of the differential thickness plate is fully exerted.
The first edge pressing block and the second edge pressing block both comprise: the device comprises a pressure cylinder, a plunger, a blank holder and an upper template; the plunger is positioned in the pressure cylinder, the plunger divides the pressure cylinder into an upper oil cylinder and a lower oil cylinder, the blank holder is connected with the plunger and is in contact with the differential thick plate, and the pressure cylinder is connected with the upper template; the second edge pressing block and the first edge pressing block are symmetrical relative to the male die.
And a polyurethane mold gap adjusting plate is pasted on the contact surface of the blank holder and the differential thick plate, and a uniform blank holder gap is provided through the mold gap adjusting plate made of polyurethane so as to ensure that the blank holder force of the blank holder is uniformly applied to each part of the differential thick plate.
The die base includes: a female die holder and a female die; the female die is positioned on the female die seat.
The hydraulic control system comprises a first hydraulic control system and a second hydraulic control system; the first hydraulic control system applies hydraulic pressure to the first edge pressing block, and the second hydraulic control system applies hydraulic pressure to the second edge pressing block.
The first hydraulic control system and the second hydraulic control system each include: a hydraulic and control member; the control part is connected with the hydraulic part and used for controlling the hydraulic force provided by the hydraulic part.
The control piece is an overflow valve; the overflow valve is connected with the oil tank and used for returning oil to the oil tank.
The hydraulic part comprises a pressure oil pump, a three-position four-way reversing valve and a speed regulating valve; the pressure oil pump is connected with an oil tank, the pressure oil pump is connected with an oil inlet of the three-position four-way reversing valve through the speed regulating valve, and an oil return port of the three-position four-way reversing valve is connected with the oil tank; the pressure oil pump pumps oil out of the oil tank, the throttle valve can adjust the flow of the oil, and the three-position four-way reversing valve can achieve reverse flow of the oil.
And the port A of the three-position four-way reversing valve is connected with the upper oil cavity of the pressure cylinder through a pressure gauge, the port B of the three-position four-way reversing valve is connected with the lower oil cavity of the pressure cylinder, and the oil in the pressure cylinder flows in and flows out through the oil circuit.
The port A of the three-position four-way reversing valve is connected with the overflow valve through the pressure gauge; when the pointer of the pressure gauge points to a preset pressure reading, the pressure provided by the blank holder is the required blank holder force, the pressure oil pump stops working, once the reading of the pressure gauge exceeds a set value, oil flows back to an oil tank through the overflow valve to realize unloading and pressure maintaining, and the blank holder force output by the blank holder can be changed by adjusting the set value of the overflow valve.
The invention discloses a die suitable for drawing forming of a rolled differential thick plate box-shaped piece, which is used as an execution component of a control system to control, wherein the control system comprises a process monitoring module, an identification prediction module, a real-time control module and a system execution module, the process monitoring module is connected with the real-time control module through the identification prediction module, the real-time control module is connected with the system execution module, the process monitoring module adopts a data acquisition system based on LabVIEW to monitor drawing process variables in real time, the drawing process variables comprise drawing force, blank holding force, drawing stroke and the like, the identification prediction module establishes a neural network model, the neural network model comprises a neural network identification model and a neural network prediction model, and the neural network identification model is used for controlling the drawing forming of the rolled differential thick plate box-shaped piece according to the drawing force, blank holding force, drawing stroke and the, The system comprises a neural network prediction module, a real-time control module, a neural network PID control system and a system execution module, wherein the neural network prediction module obtains the optimal blank pressing force and the optimal drawing speed according to the material performance parameters of the differential thick plate, the geometric parameters of the differential thick plate and the drawing stroke obtained by the neural network recognition module, the real-time control module controls the blank pressing force values and the drawing speed values at different positions according to the optimal blank pressing force and the optimal drawing speed obtained by the recognition prediction module, and the system execution module controls the blank pressing force values and the drawing speed values at different positions according to the neural network PID control system to perform drawing forming of the differential thick plate.
The data acquisition system of the process monitoring module comprises an A/D conversion card (data acquisition card), an industrial personal computer, a pressure limiter and a dynamic strain gauge, wherein the dynamic strain gauge is a multi-channel dynamic strain gauge, a sensor and a collection, recording and display program based on LabVIEW, and the dynamic strain gauge is connected with the sensor, so that the measurement of dynamic stress and strain can be realized, and the functions of signal amplification, filtering demodulation and the like can be realized. The sensor is divided into a linear displacement sensor and a strain gauge type pressure sensor which is amplified by a dynamic strain gauge, the corresponding relation between the sensor voltage and the drawing force, the blank holder force and the drawing stroke is obtained by calibrating the pressure sensor and the displacement sensor, the sensor converts the drawing process variable into an analog voltage signal according to the corresponding relation, the A/D conversion card receives the analog voltage signal, converts the analog voltage signal into a digital signal and inputs the digital signal to the industrial personal computer, the digital personal computer is stored in a format of a data file, the industrial personal computer calculates a drawing speed-stroke curve by using the differential relation between the speed and the displacement and displays the drawing speed-stroke curve and the blank holder force-stroke curve in real time, and the voltage limiter is arranged between the dynamic strain gauge and the A/D conversion card, the voltage limiter limits the voltage within a certain range and plays a role in protecting the intelligent drawing control system for the rolled differential thick plate box-shaped piece.
The identification prediction module is mainly composed of a computer and a corresponding program, and adopts a Matlab neural network model optimized based on a genetic algorithm to perform online identification of material performance parameters and online prediction of optimal process parameters, wherein the optimal process parameters are the optimal blank pressing force and the optimal drawing speed. And a LabVIEW main program of the control system analyzes and processes the characteristic information of the processed object obtained by the process detection module, identifies the material performance parameters of the processed object in real time through a neural network identification model, and gives an optimal variable blank holder force curve and an optimal drawing speed curve by adopting a neural network prediction model.
The neural network identification model is based on a Matlab neural network technology, the drawing process variable and the geometric parameters of the differential thick plate are used as input layer parameters, the performance parameters of the differential thick plate are used as output layer parameters, and the nonlinear mapping relation among the performance parameters of the differential thick plate, the drawing process variable and the geometric parameters of the differential thick plate is established; the neural network prediction model is used for establishing a nonlinear mapping relation between the optimal blank pressing force and the optimal drawing speed and the performance parameters of the differential thick plate, the geometric parameters of the differential thick plate and the drawing stroke by taking the performance parameters of the differential thick plate, the geometric parameters of the differential thick plate and the drawing stroke as neural network input layer variables and taking the optimal blank pressing force and the optimal drawing speed as output layer variables.
The real-time control module mainly comprises a D/A conversion card (high-speed analog output card), a control program, a proportional overflow valve, a proportional amplifier, an electro-hydraulic proportional valve and the like. Developing a real-time control module based on a LabVIEW software platform, forming a neural network PID control system by adopting a neural network PID algorithm based on a gray prediction model, taking the drawing stroke as a feedback signal, taking the optimal blank pressing force and the optimal drawing speed as control signals, obtaining a relation curve between the blank pressing force value and the control voltage of the proportional overflow valve by calibrating the proportional overflow valve, obtaining a relation curve between the drawing speed value and the control voltage of the electro-hydraulic proportional valve by calibrating the electro-hydraulic proportional valve, converting the blank pressing force value and the drawing speed value into control voltage signals according to the relation curve, converting digital quantity of the control voltage signals into analog quantity by a D/A conversion card, and converting the digital quantity into control current signals by a proportional amplifier to control the opening quantities of the proportional valve and the electro-hydraulic proportional valve, the pressure of the blank holder hydraulic cylinder and the speed of the hydraulic press main cylinder are changed, and the blank holder force and the drawing speed are also changed.
According to the requirements of the forming characteristics of the box-shaped piece, the zonal variable blank holder force control needs to be realized, therefore, the blank holder force control units corresponding to each control area need to be arranged on the drawing die by the hydraulic control part, each blank holder force control unit independently controls the blank holder force and provides control quantity by a control algorithm along with the measured drawing stroke, the hydraulic control part corresponds to different blank holder force control units according to the difference between the optimal blank holder force and the optimal drawing speed required by each area, the different blank holder force control units respectively comprise a motor, a plunger pump, an oil tank, a hydraulic cylinder, a filter, an electromagnetic reversing valve, a throttle valve and a hydraulic control one-way valve, the motor pumps oil out of the oil tank through the plunger pump, and the oil enters the electromagnetic reversing valve through the filter, the hydraulic control one-way valve and the throttle valve in sequence to realize the forward and reverse flow of the oil, and finally, entering the hydraulic cylinder, wherein the electromagnetic directional valve is used for controlling the upward movement and the downward movement of the blank holder cylinder piston, the throttle valve is used for controlling the upward movement and the downward movement of the blank holder cylinder piston, and the hydraulic control one-way valve is used for ensuring the forward flow of oil. The neural network PID control system completes process action and blank holder force adjustment through the hydraulic control part, meanwhile completes drawing forming through controlling the hydraulic control part to be matched with the drawing part, and the change of the movement speed of the main sliding block of the hydraulic machine is realized through adjusting the electro-hydraulic proportional valve in the real-time control module.
The invention also provides an intelligent deep drawing method for rolling the differential thick plate box-shaped piece, which comprises the following steps:
A. and monitoring drawing process variables in real time according to a data acquisition system based on LabVIEW, wherein the drawing process variables comprise drawing force, blank pressing force and drawing stroke.
B. Establishing a neural network model, and optimizing a neural network structure, weight and threshold by adopting an improved hierarchical genetic algorithm, wherein the neural network model comprises a neural network identification model and a neural network prediction model, the neural network identification model obtains the material performance parameters of the differential thick plate according to the drawing force, the blank holding force, the drawing stroke and the geometric parameters of the differential thick plate obtained by the data acquisition system, and the neural network prediction model obtains the optimal blank holding force and the optimal drawing speed according to the material performance parameters of the differential thick plate, the geometric parameters of the differential thick plate and the drawing stroke obtained by the neural network identification model.
C. And controlling the blank pressing force value and the drawing speed value applied to different positions of the differential thickness plate by combining a neural network PID control system based on a gray prediction model according to the optimal blank pressing force and the optimal drawing speed obtained by the neural network model, wherein the neural network PID control system based on the gray prediction model is obtained by combining a gray theory, a BP neural network and a PID control algorithm.
D. And controlling the blank pressing force values and the drawing speed values at different positions according to the neural network PID control system to perform drawing forming on the differential thick plate.
In the above steps, the method for establishing the data acquisition system comprises:
the drawing speed-stroke curve is obtained by calculating the differential relation between the speed and the displacement by the industrial personal computer, and is displayed together with the drawing force-stroke curve and the blank pressing force-stroke curve in real time.
The method for establishing the neural network model comprises the following steps:
establishing a neural network model based on a forward network model, wherein the neural network is a BP neural network, determining the number of nodes of an input layer and an output layer according to input variables and output variables of the neural network identification model and the neural network prediction model, and comprehensively considering the generalization capability of the network to determine the number of nodes of a better hidden layer; establishing a sample database based on a differential plate one-way deep drawing test, numerical simulation, the neural network identification model and the neural network prediction model, wherein the sample data is subjected to normalization processing, and meanwhile, the influence of singular data is reduced or eliminated by adopting an average value and singular point removing method, so that higher generalization precision is obtained; the learning function adopts a gradient descending momentum learning function, determines a network learning rate, inertia factors and transfer functions of each layer, constructs an error index function, and trains the neural network model by adopting a Bayesian regularization training method to improve the network performance.
In order to improve the learning efficiency and convergence of the neural network, a genetic algorithm is combined with the neural network model, and in order to improve the performance of a standard genetic algorithm, an improved hierarchical genetic algorithm is provided for optimizing the structure, weight and threshold of the neural network model, wherein the optimization method comprises the following steps:
setting maximum evolution algebra and population scale, simultaneously coding topological structure, weight and threshold information of the neural network model by adopting a hierarchical genetic algorithm with a hierarchical structure, and randomly generating an initial population, wherein the hierarchical genetic algorithm adopts a three-layer hierarchical structure, the first two layers of control genes respectively determine the number of hidden layers of the neural network model and the number of neurons activated in each hidden layer, the last layer of parameter genes represents the connection weight and the threshold of each neuron, the control genes adopt binary coding, the 1 and 0 respectively represent that the lower layer of genes are in an activated state and a non-activated state, the parameter genes adopt real number coding, and coding is sequentially carried out on the connection weight between the input layer and the hidden layer of the neural network model, the threshold of the hidden layer, the connection weight between the hidden layer and the output layer, and the threshold of the output layer; then, all population individuals are brought into the neural network model, respective prediction errors are calculated, the reciprocal of the sum of squares of the errors is selected as a fitness function, the evaluation standards of the BP neural network and the genetic algorithm are integrated, and the optimization performance of the network is improved; then, the individual fitness values are arranged in sequence, a roulette method is selected to complete selection operation, an elite retention strategy is added in the selection process to ensure that the individual with the highest fitness can be directly selected to form a new population, and a steady state propagation method is adopted, namely, before the individual is added into the new generation of population, whether the individual is repeated with the existing individual in the population is firstly checked, and if the individual is repeated, the individual is discarded; the method comprises the steps that single-point crossing or multi-point crossing is adopted for layer control genes, single-point crossing or multi-point crossing is adopted for neuron control genes, arithmetic crossing is adopted for parameter genes, connection mutation and biased weight mutation are adopted for mutation operators, cross probability and mutation probability are adjusted in a self-adaptive mode, further crossing and mutation operations are completed to generate the next generation until evolution algebra reaches a preset value, the optimization process is finished, optimal individuals are obtained, the number of hidden layers, the number of neurons, weight values and threshold values of a neural network model are obtained after decoding, and assignment is conducted on the neural network model, and optimization of the neural network model is completed.
The neural network identification model is based on a Matlab neural network technology, the drawing process variable and the geometric parameters of the differential thick plate are used as input layer parameters, the performance parameters of the differential thick plate are used as output layer parameters, and the nonlinear mapping relation among the performance parameters of the differential thick plate, the drawing process variable and the geometric parameters of the differential thick plate is established; the neural network prediction model is used for establishing a nonlinear mapping relation between the optimal blank pressing force and the optimal drawing speed and the performance parameters of the differential thick plate, the geometric parameters of the differential thick plate and the drawing stroke by taking the performance parameters of the differential thick plate, the geometric parameters of the differential thick plate and the drawing stroke as neural network input layer variables and taking the optimal blank pressing force and the optimal drawing speed as output layer variables.
The steps of predicting the optimal blank holder force and the optimal drawing speed according to the optimized neural network are as follows:
developing a drawing forming signal acquisition program of a thick plate box-shaped part by adopting a virtual instrument technology based on LabVIEW, completing an efficient interface program among the data acquisition system, the neural network identification model and the neural network prediction model by utilizing MatlabScript function nodes provided by LabVIEW software, embedding the neural network identification model and the neural network prediction model obtained by network learning, inputting the geometric parameters of the thick plate and the drawing process variables into a network model in real time according to the requirements of input variables of the neural network model, embedding a Matlab script program in a frame, namely a real-time identification neural network model which is trained by a sample, inputting the output variables of a script frame, namely the identified material performance parameters of the thick plate, the geometric parameters of the thick plate and the drawing stroke into the trained neural network model in real time by the same method, and predicting the optimal blank pressing force and the optimal drawing speed in real time to obtain an optimal prediction curve.
Because the drawing speed and the blank pressing forces at different positions have the requirements of relative independence, control synchronism and small time lag of a control system, a gray prediction model, a BP neural network and a PID controller are combined to form a neural network PID control system, the neural network provides relatively independent blank pressing force control quantity for each area, the synchronism of each blank pressing force and the drawing speed is ensured, advanced control is realized through a gray theoretical model, sample data is reduced, quick response prediction is realized, and the prediction accuracy is improved.
The method for controlling the blank pressing force values and the drawing speed values at different positions by the neural network PID control system comprises the following steps:
the neural network PID control system is composed of three parts, wherein the first part is an independent incremental PID closed-loop control network composed of an optimal blank holder force and an optimal drawing speed input, a PID controller network, a proportional valve and a sensor, and the program is developed based on a LabVIEW platform. The second part is BP neural network, the input is the optimum parameter set value, grey predicted value and the error of the two, the output is 3 parameters K of PID controller networkP、KI、KDThe program is compiled by Matlab software. BP neural network selectionThe error function of each control loop and the error function between the loops are used as performance index functions, so that the requirements on control precision and synchronism are met, the output node adopts a non-negative S function as an activation function, the activation function of the hidden layer neuron adopts a positive-negative symmetric S function, the correction of a network weighting coefficient adopts a gradient descent method, the third part is a gray prediction model, the optimal blank pressing force value, the optimal drawing speed value, the output value of the proportional overflow valve and the output value of the electro-hydraulic proportional valve are respectively used as input, the gray prediction value is used as output, and Matlab software programming is also adopted in the third part. Interface programs of the second part, the third part and the first part of the control system are developed by utilizing MatlabScript script function nodes of LabVIEW software, the self-learning process of the neural network is completed through the steps of initialization, forward propagation of information, backward propagation of errors, correction of connection weights and thresholds and the like, the self-adaptive adjustment of 3 parameters of each PID controller network is realized, the synchronous and relatively independent control quantity can be applied to each variable at any drawing time, and the advanced control is realized through a gray prediction model. The principle of realizing the advanced control by the gray theory is as follows (taking blank holding force control as an example): obtaining output blank holder force p (t) by the sensor at the current moment t, forming a group of data sequence with data before the moment t, and another group of input data sequence r (t), establishing a GM (1, N) model by two groups of data, predicting output data y (t +1) at the next moment by the model, and obtaining an error delta e (t +1) by comparing p (t) in actual output with input r (t +1) at the moment t +1 by replacing y (t +1) with y (t +1), thereby achieving the purposes of pre-controlling and reducing the error, and further improving the convergence speed of a BP neural network and the response speed of a PID controller network, wherein u (t) is control voltage. A control system formed by combining the gray prediction model, the BP neural network and the PID controller network can realize optimal control in the aspects of synchronism, dynamic and steady-state performance, robustness and the like.
Developing a real-time control module based on a LabVIEW software platform, forming a neural network PID control system by adopting a neural network PID algorithm based on gray prediction, taking the drawing stroke as a feedback signal, taking the optimal blank pressing force and the optimal drawing speed as control signals, obtaining a relation curve between the blank pressing force value and the control voltage of the proportional overflow valve by calibrating the proportional overflow valve, obtaining a relation curve between the drawing speed value and the control voltage of the electro-hydraulic proportional valve by calibrating the electro-hydraulic proportional valve, converting the blank pressing force value and the drawing speed value into control voltage signals according to the relation curve, converting digital quantity of the control voltage signals into analog quantity by a D/A conversion card, and converting the digital quantity into control current signals by a proportional amplifier so as to control the opening quantities of the proportional overflow valve and the electro-hydraulic proportional valve, the pressure of the blank holder hydraulic cylinder and the speed of the hydraulic press main cylinder are changed, and the blank holder force and the drawing speed are also changed.
The blank holder force control part mainly achieves the purpose of controlling the blank holder force by adjusting the opening amount of the proportional overflow valve, so that the corresponding relation between the blank holder force and the control voltage of the proportional overflow valve and the corresponding relation between the drawing speed and the control voltage of the electro-hydraulic proportional valve need to be found, a relation curve between the blank holder force value and the control voltage of the proportional overflow valve is obtained by calibrating the proportional overflow valve, and a relation curve between the drawing speed value and the control voltage of the electro-hydraulic proportional valve is obtained by calibrating the electro-hydraulic proportional valve, and the concrete method is as follows:
the method comprises the steps of changing the voltage of the proportional overflow valve for many times in the process of pressing the die under no load, measuring corresponding blank holder force values at different voltage values, obtaining a relation curve of the control voltage of the proportional overflow valve and the blank holder force, obtaining a function relation of the control voltage and the blank holder force by adopting high-order curve fitting, writing the function relation into a LabVIEW experiment program, driving the voltage adjustment of the proportional overflow valve by the predicted blank holder force value, controlling the pressure of a hydraulic cylinder by changing the opening amount of the proportional overflow valve, further controlling the size of the blank holder force, determining the relation between the drawing speed and the control voltage of the electro-hydraulic proportional valve by adopting the same method, ensuring that the drawing speed is changed according to the optimal predicted curve, realizing the blank holder force control along with the linkage of stroke and position by the real-time control device, and setting the blank holder force along with the linkage of the stroke through the, the edge pressing force which changes along with the position is realized by arranging different edge pressing force-stroke curves for different edge pressing cylinders.
Controlling the blank pressing force values and the drawing speed values at different positions according to the neural network PID control system, and performing drawing forming on the differential thick plate specifically comprises the following steps:
in the starting stage, the blank holder cylinder drives the blank holder to move upwards, the position of the blank holder is fed back to control software of an industrial personal computer by a second displacement sensor, after the preset blank holder zero position is reached, the industrial personal computer sends a control command to power off an ascending valve to enable the blank holder to be in place at a preset position, after the blank holder is in place, a differential plate is placed between the blank holder and a female die, the industrial personal computer control software sends a control command to enable a main sliding block of a hydraulic press to move downwards, the drawing action starts, a drawing stroke is fed back to the industrial personal computer by the first displacement sensor in the drawing forming stage, the blank holder force of a second pressure sensor and the drawing force of a first pressure sensor are transmitted to the industrial personal computer in real time, the real-time feedback control of the drawing speed and the blank holder force of each partition is realized by a control algorithm, and the synchronous output of the drawing speed and the, until drawing is finished.
Compared with the prior art, the invention discloses a die suitable for deep drawing of a rolled differential thick plate box-shaped part, which comprises the following components: the hydraulic control system of the drawing die and the blank holder force of the differential plate box-shaped piece. Aiming at the geometric characteristics of the differential thick plate, the thickness difference of the differential thick plate is compensated by adopting a stepped male die (the profile of the stepped male die is matched with the surface shape of the differential thick plate) and a stepped die clearance adjusting plate (made of polyurethane), different blank holder forces are provided for thin and thick side plates by adopting blocked blank holders, the blank holder forces are provided by a hydraulic part, and the blank holder forces of the two blank holders are respectively controlled by two hydraulic control systems. The pressure oil chambers of the device are connected together through the hydraulic control element to realize complete return circuit of oil, so that waste of the oil is avoided, and oil recycling is realized.
The design of the invention can realize that the pressure values of the two blank pressing oil cylinders are respectively changed, thereby ensuring the reasonable matching of the partitioned blank pressing forces corresponding to the thin and thick side plates, ensuring the uniform flow of the materials at the thin and thick sides of the differential thick plate in the drawing process, reducing the movement of the thickness transition region, inhibiting the occurrence of the defects of cracking and wrinkling, fully exerting the forming performance of the differential thick plate, and realizing the aim of light weight on the basis of obtaining high-quality differential thick plate parts.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of a differential thickness plate box stamping device;
the device comprises a male die 1, a male die 2, an upper die plate 3, a pressure cylinder 4, a plunger 5, a blank holder 6, a die gap adjusting plate 7, a differential thick plate 8, a female die 9, a female die holder 10, a first pressure oil tank 11, a pressure oil pump 12, a speed regulating valve 13, a second pressure oil tank 14, a first pressure gauge 15, a three-position four-way electromagnetic reversing valve 16, a throttle valve 17, a second pressure gauge 18, a third pressure oil tank 19 and an overflow valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a stamping forming device for a box-shaped piece of a differential thick plate, as shown in figure 1, a die suitable for drawing forming of a box-shaped piece of a rolled differential thick plate is suitable for drawing forming of the box-shaped piece of the rolled differential thick plate, and comprises the following components: the device comprises a male die 1, a first edge pressing block, a second edge pressing block, a female die base and a hydraulic control system.
Further, the first and second edge pressing blocks are positioned on the male die 1 and are symmetrical with respect to the male die 1; the die base includes: the die comprises a die holder 9 and a die 8, wherein the die 8 is positioned on the die holder 9. The difference thick plate 7 is placed on the upper surface of the female die, and the first edge pressing block and the second edge pressing block are both in contact with the difference thick plate 7 and provide edge pressing force.
Further, first blank holder and second blank holder all include: the device comprises a pressure cylinder 3, a plunger 4, a blank holder 5 and an upper template 2; the plunger 4 is positioned in the pressure cylinder 3, the plunger 4 divides the pressure cylinder 3 into an upper oil cavity and a lower oil cavity, the blank holder 5 is connected with the plunger 4 and is contacted with the differential thickness plate 7, and the pressure cylinder 3 is connected with the upper template 2; the second edge pressing block and the first edge pressing block are symmetrical about the male die 1.
In this embodiment, a polyurethane mold gap adjusting plate 6 is adhered to the contact surface of the blank holder 5 and the differential thick plate 7, and a uniform blank holder gap is provided by the mold gap adjusting plate 6 made of polyurethane material to ensure that the blank holder force of the blank holder 5 is uniformly applied to each part of the differential thick plate 7.
In another embodiment, the mold gap adjusting plate is not used, and the blank holders made of polyurethane materials with different thicknesses are used for being suitable for the two sides of the difference plate.
In this embodiment, the hydraulic control system includes a first hydraulic control system and a second hydraulic control system; the first hydraulic control system applies hydraulic pressure to the first edge pressing block to provide edge pressing force required by forming for the thin side plate material of the differential thickness plate 7; and the second hydraulic control system applies hydraulic pressure to the second edge pressing block to provide edge pressing force required by forming for the thick side plate material of the differential thick plate 7.
Further, since the composition and principle of the two systems are substantially the same, only the control system of the thin plate side edge pressing force is given here, and the corresponding description is made. Taking fig. 1 as an example, the hydraulic control system includes: a hydraulic and control member; the control piece is an overflow valve 19, the overflow valve 19 is connected with the third oil tank 18, and the control piece is connected with the hydraulic part and controls the hydraulic pressure provided by the hydraulic part.
Further, the hydraulic part comprises a pressure oil pump 11, a three-position four-way electromagnetic directional valve 15 and a speed regulating valve 12; the pressure oil pump 11 is connected with the first oil tank 10, the pressure oil pump 11 is connected with an oil inlet of the three-position four-way electromagnetic directional valve 15 through the speed regulating valve 12, and an oil return port of the three-position four-way electromagnetic directional valve 15 is connected with the second oil tank 13.
Further, a port 15A of the three-position four-way electromagnetic directional valve is connected with an oil cavity on the pressure cylinder 3 through a second pressure gauge 17; the port 15A of the three-position four-way electromagnetic directional valve is connected with an overflow valve 19 through a second pressure gauge 17; and a port B of the three-position four-way electromagnetic reversing valve 15 is connected with a lower oil cavity of the pressure cylinder 3.
In another embodiment, the three-position four-way electromagnetic directional valve 15 may be replaced with a three-position four-way manual directional valve.
In another embodiment, the three-position four-way electromagnetic directional valve 15 may be replaced with a three-position four-way electro-hydraulic directional valve.
In this embodiment, the work flow of the hydraulic control system is divided into a forming phase and a returning phase, where the forming phase: the pressure oil pump 11 is started to start oil supply into the upper oil chamber of the pressure cylinder 3. The oil is pumped out from the first oil tank 10, passes through the speed regulating valve 12, the three-position four-way electromagnetic directional valve 15 (left position) and the throttle valve 16 in sequence, and finally enters the upper oil cavity of the pressure cylinder 3.
Further, the oil drives the plunger 4 to drive the blank holder 5 at the lower end of the plunger to move downwards together, so that blank holding for the differential thick plate 7 is realized. Meanwhile, the oil in the lower chamber of the pressure cylinder 3 returns to the second oil tank 13 through the three-position four-way electromagnetic directional valve 15 (left position). Here, the speed regulating valve 12 can regulate the flow rate, the three-position four-way electromagnetic directional valve 15 can realize the reverse flow of the oil, and the throttle valve 16 can regulate the flow rate of the oil.
Further, when the pointer of the second pressure gauge 17 points to a preset pressure reading, the pressure provided by the blank holder 5 is the required blank holder force, the pump stops working, once the reading of the second pressure gauge 17 exceeds a set value, the oil flows back to the third oil tank 18 through the overflow valve 19 to realize unloading and pressure maintaining, and the blank holder force output by the blank holder 5 can be changed by adjusting the set value of the overflow valve 19.
Further, the male die 1 moves downwards under the driving of the hydraulic press slide block to pull the sheet material into the female die 8, so that the drawing forming of the differential thick plate box-shaped part is completed.
And (3) a return stage: after the drawing forming of the differential thick plate box-shaped piece is finished, the main sliding block of the press machine drives the male die 1 to move upwards, and the return stroke of the male die 1 is realized. The pressure oil pump 11 is restarted to supply oil to the lower oil cavity of the pressure cylinder 3, and the right position of the three-position four-way electromagnetic directional valve 15 is opened, and the left position is closed, so that the reverse flow of oil is realized. Oil is pumped out from a first oil tank 10 and enters a lower oil cavity of the pressure cylinder 3 through a speed regulating valve 12 and a three-position four-way electromagnetic reversing valve 15 (right position) in sequence. The oil drives the plunger 4 to drive the blank holder 5 to move upwards together, so that the return stroke of the blank holder 5 is realized.
Further, at the same time, the oil in the upper chamber of the pressure cylinder 3 returns to the second oil tank 13 through the throttle valve 16 and the three-position four-way electromagnetic directional valve 15 (right position), the pressure oil pump 11 stops working, once the reading of the pressure gauge 17 exceeds the set value, the oil flows back to the third oil tank 18 through the overflow valve 19, and unloading and pressure maintaining are realized.
In this embodiment, the male die 1 has a stepped shape, and the surface thereof can be perfectly attached to the surface of the difference thick plate 7, thereby sufficiently exerting the forming performance of the difference thick plate 7.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The utility model provides a mould suitable for rolling difference thick plate box-shaped member deep-drawing takes shape, is applicable to the deep-drawing of rolling difference thick plate box-shaped member and takes shape which characterized in that: the method comprises the following steps: the device comprises a male die (1), a first edge pressing block, a second edge pressing block, a female die base and a hydraulic control system;
the first blank pressing block and the second blank pressing block are located on the male die (1), a differential thick plate (7) is placed on the upper surface of the female die base, the first blank pressing block and the second blank pressing block are both in contact with the differential thick plate (7) and provide blank pressing force, and the hydraulic control system applies hydraulic force to the first blank pressing block and the second blank pressing block and further provides required blank pressing force for forming thin and thick side plates of the differential thick plate (7).
2. The die for deep drawing of a box-shaped rolled differential thick plate according to claim 1, wherein: first blank pressing piece all includes with second blank pressing piece: the device comprises a pressure cylinder (3), a plunger (4), a blank holder (5) and an upper template (2); the plunger (4) is positioned in the pressure cylinder (3), the blank holder (5) is connected with the plunger (4) and is in contact with the difference thick plate (7), the pressure cylinder (3) is connected with the upper template (2), and the pressure cylinder (3) is connected with the hydraulic control system; the second edge pressing block and the first edge pressing block are symmetrical relative to the male die (1).
3. The die for deep drawing of a box-shaped rolled differential thick plate according to claim 2, wherein: and a polyurethane mold gap adjusting plate (6) is adhered to the contact surface of the blank holder (5) and the difference thick plate (7).
4. The die for deep drawing of a box-shaped rolled differential thick plate according to claim 1, wherein: the die base includes: a concave die holder (9) and a concave die (8); the female die (8) is positioned on the female die holder (9).
5. The die for deep drawing of a box-shaped rolled differential thick plate according to claim 2, wherein: the hydraulic control system comprises a first hydraulic control system and a second hydraulic control system; the first hydraulic control system applies hydraulic pressure to the first edge pressing block, and the second hydraulic control system applies hydraulic pressure to the second edge pressing block.
6. The die for deep drawing of a box-shaped rolled differential thickness plate according to claim 5, wherein: the first hydraulic control system and the second hydraulic control system each include: a hydraulic and control member; the control part is connected with the hydraulic part and controls the hydraulic force provided by the hydraulic part.
7. The die for deep drawing of a box-shaped rolled differential thickness plate according to claim 6, wherein: the control element is an overflow valve (19); the overflow valve (19) is connected with an oil tank, and meanwhile, the overflow valve (19) is connected with the hydraulic part.
8. The die for deep drawing of a box-shaped rolled differential thickness plate according to claim 7, wherein: the hydraulic part comprises a pressure oil pump (11), a three-position four-way electromagnetic directional valve (15) and a speed regulating valve (12); the pressure oil pump (11) is connected with an oil tank, the pressure oil pump (11) is connected with an oil inlet of the three-position four-way electromagnetic directional valve (15) through the speed regulating valve (12), and an oil return port of the three-position four-way electromagnetic directional valve (15) is connected with the oil tank.
9. The die for deep drawing of a box-shaped rolled differential thickness plate according to claim 8, wherein: the port A of the three-position four-way electromagnetic directional valve (15) is connected with the oil cavity on the pressure cylinder (3) through a second pressure gauge (17); the port A of the three-position four-way electromagnetic directional valve (15) is connected with the overflow valve (19) through the second pressure gauge (17); and a port B of the three-position four-way electromagnetic reversing valve (15) is connected with a lower oil cavity of the pressure cylinder (3).
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| CN202011419274.6A CN112692169B (en) | 2020-12-07 | 2020-12-07 | Deep drawing forming die for box-shaped part of rolled differential thick plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011419274.6A CN112692169B (en) | 2020-12-07 | 2020-12-07 | Deep drawing forming die for box-shaped part of rolled differential thick plate |
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| CN112692169B CN112692169B (en) | 2022-11-29 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2510196Y (en) * | 2001-11-07 | 2002-09-11 | 华中科技大学 | Metal thin-plate hydraulic-forming die apparatus |
| JP2006218501A (en) * | 2005-02-09 | 2006-08-24 | Nippon Steel Corp | Press-forming die and forming method for butt-welded metallic sheet |
| CN203420964U (en) * | 2013-07-29 | 2014-02-05 | 广东科达机电股份有限公司 | Oil path control structure of synchronous oil cylinders |
| CN104324998A (en) * | 2014-11-05 | 2015-02-04 | 湖南农业大学 | Variable blank holder force deep drawing die with automatic control function |
| DE102015213485A1 (en) * | 2015-07-17 | 2017-01-19 | Bayerische Motoren Werke Aktiengesellschaft | Press tool with a shell mold for the forming of tailored blanks and method for producing a mold shell |
-
2020
- 2020-12-07 CN CN202011419274.6A patent/CN112692169B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2510196Y (en) * | 2001-11-07 | 2002-09-11 | 华中科技大学 | Metal thin-plate hydraulic-forming die apparatus |
| JP2006218501A (en) * | 2005-02-09 | 2006-08-24 | Nippon Steel Corp | Press-forming die and forming method for butt-welded metallic sheet |
| CN203420964U (en) * | 2013-07-29 | 2014-02-05 | 广东科达机电股份有限公司 | Oil path control structure of synchronous oil cylinders |
| CN104324998A (en) * | 2014-11-05 | 2015-02-04 | 湖南农业大学 | Variable blank holder force deep drawing die with automatic control function |
| DE102015213485A1 (en) * | 2015-07-17 | 2017-01-19 | Bayerische Motoren Werke Aktiengesellschaft | Press tool with a shell mold for the forming of tailored blanks and method for producing a mold shell |
Non-Patent Citations (3)
| Title |
|---|
| 张华伟: "《轧制差厚板成形性能研究》", 《中国优秀博硕士学位论文全文数据库(博士)工程科技Ⅱ辑》 * |
| 苏春建等: "《盒形件拉深智能化控制实时识别及预测》", 《中国机械工程》 * |
| 马瑞等: "《简单形状零件拉深成形智能化控制技术研究》", 《材料科学与工艺》 * |
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