A stamping die system and a control method thereof

Abstract

The present application relates to the technical field of punch forming, and in particular to a punch die system and a control method thereof. The die system comprises at least one laser displacement sensor, a plurality of automatic adjusting balance blocks and a controller. The laser displacement sensor is installed on an upper die or a blank holder, and is used to collect position information of a specific part of a receiving line of each stroke forming part. The automatic adjusting balance block is installed on the blank holder. The controller is connected with the laser displacement sensor, the automatic adjusting balance block and a press machine respectively. The controller controls the automatic adjusting balance block to perform lifting adjustment and / or adjust a blank holding force of the blank holder applied by the press machine based on the position information of the receiving line from the laser displacement sensor. The present application can realize self-adaptive adjustment for the receiving line, monitor the receiving line, reveal variation law of the drawing forming receiving line, adjust production parameters before producing unqualified products, and ensure the stability of the production process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of punch forming, in particular to a punch die system and a control method thereof. BACKGROUND

[0002] Due to the changes of sheet metal performance, external temperature, sheet metal roughness and lubrication conditions, and the influence of factors such as mold temperature rise in continuous production process, the forming process of stamping parts is different between batches or in the process of "first middle tail" in the same batch, and the quality state is different, which is often manifested as obvious defects such as neck cracking or wavy wrinkle. Therefore, it is often necessary to adjust the drawing blank holder force and balance block and other production parameters in the production process to produce qualified parts.

[0003] At present, the adjustment of parameters in the production process is passive, and often some parameters are adjusted by technicians according to experience after producing unqualified parts. This adjustment method is lagging behind, unqualified parts have been produced, causing failure cost, and the adjustment process depends on experience, the adjustment amount is not accurate, and multiple adjustments are needed to achieve the ideal effect.

[0004] In view of the above problems, the present inventors have finally obtained the present application after long-term research and practice. SUMMARY

[0005] To solve the above technical problems, the present application provides a punch die system and a control method thereof, which monitors the production process variables, identifies subtle changes that may lead to the production of unqualified products, adjusts the production parameters before the production of unqualified products, adapts to the changes in conditions, ensures the stability of the production process, reduces the production of unqualified products, and reduces the downtime in the production process.

[0006] The technical scheme adopted by the present application is:

[0007] On the one hand, a punch die system is provided, which comprises an upper die, a lower die, a blank holder and a press, the blank holder is located between the upper die and the lower die, and the press provides a blank holder force on the blank holder; the punch die system further comprises at least one laser displacement sensor, a plurality of automatic adjusting balance blocks and a controller;

[0008] The laser displacement sensor is installed on the upper die or the blank holder, and is used to collect position information of a specific part of a receiving line of each stroke forming part;

[0009] The automatic adjusting balance block is installed on the blank holder;

[0010] The controller is electrically connected or communicatively connected with the laser displacement sensor, the automatic adjusting balance block and the press respectively; the controller controls the automatic adjusting balance block to adjust the height and / or the blank holder force based on the position information of the blank line collected by the laser displacement sensor.

[0011] Further, the laser displacement sensor is also used to collect the initial position information of the plate, the inflow information of the blank line and the inflow rate information of the blank line.

[0012] Further, the automatic adjusting balance block comprises a base, a motor, a worm, a worm wheel, a lead screw and a pressure receiving block, the base is installed on the blank holder ring, the base is internally provided with a transmission cavity, the worm and the worm wheel are installed in the transmission cavity and are in transmission connection, the motor is arranged on one side of the base, the motor is in transmission connection with the worm, the inner ring of the worm wheel is provided with trapezoidal threads matched with the lead screw, the lead screw is vertically arranged, the pressure receiving block is fixed at the top end of the lead screw, and the top surface of the pressure receiving block is a balance block pressure receiving surface.

[0013] Further, based on the simulation analysis result and / or the big data analysis result and / or experience, the position of the blank line detected by the laser displacement sensor is determined, which is located at a position where the change of the blank line has a significant influence on the quality of the part.

[0014] Further, the pressure surface of the laser emitting section of the laser displacement sensor is a plane.

[0015] Further, the laser spot diameter of the laser displacement sensor is less than or equal to the gap between the pressure surfaces.

[0016] On the other hand, a control method of a stamping die system is provided, which adopts the stamping die system, and comprises the following steps:

[0017] Step one: based on the simulation analysis result and / or the big data analysis result and / or experience, the position where the change of the blank line of the part has a significant influence on the quality of the part is determined, and the laser displacement sensor is arranged according to the position to monitor the blank line of the part;

[0018] Step two: the controller receives the blank line information collected by the laser sensor, obtains the change amount of the blank line in real time according to the blank line information, and issues the balance block and / or blank holder force adjusting instruction based on the change amount of the blank line and the pre-defined correlation between the change amount of the blank line and the height of each automatic adjusting balance block and / or the blank holder force.

[0019] Step three: the automatic adjusting balance block and / or the press adjusts the height of the balance block and / or the size of the blank holder force according to the adjusting instruction.

[0020] Further, the step two further comprises: the controller collects the initial position of the plate in the forming process, the inflow amount and inflow rate of the receiving line according to the receiving line information, and the corresponding relationship between the initial position of the plate, the inflow amount and inflow rate of the receiving line and the stamping time and press stroke.

[0021] Further, the step two further comprises: the controller collects the final position of the receiving line of each stroke forming part according to the receiving line information, judges whether the final position of the receiving line is within the allowable range according to the pre-defined standard final position of the receiving line and the allowable fluctuation range, and issues an alarm instruction if it is out of range.

[0022] Further, in the step two, the pre-defined receiving line change amount and the association with the height of each automatic adjusting balance block and / or the blank holder force are manually set or iteratively optimized according to a computer algorithm.

[0023] The stamping die system and the control method thereof can realize self-adaptive adjustment of the receiving line, monitor the receiving line, and reveal the change rule of the drawing forming receiving line. The automatic balance block adjustment speed is fast. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0025] Figure 1 The structure schematic diagram of the existing stamping die is shown;

[0026] Figure 2 The laser displacement sensor arrangement schematic diagram of the stamping die system of the embodiment of the present application is shown;

[0027] Figure 3 The structure schematic diagram of the automatic adjusting balance block of the embodiment of the present application is shown. DETAILED DESCRIPTION

[0028] The above and other technical features and advantages of the present application will be described in more detail below with reference to the accompanying drawings.

[0029] The term "includes" and its variants are meant to cover a non-exclusive inclusion, such that a process, method, system, product, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, system, product, or apparatus. Unless otherwise specifically indicated, the term "based on" means "based, at least in part, on." The terms "one example embodiment" and "an embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional example embodiment." Other definitions, explicit and implicit, can be contained in the disclosure herein.

[0030] As Figure 1 shown, in the current stamping forming process, the stamping die includes an upper die 100, a lower die 300, and a blank holder 200. The first process-drawing: the flat plate material is deep drawn to form a shaped part. In the single-action drawing, the blank holder 200 lifts the supporting plate material, the upper die 100 goes down and closes with the blank holder 200, and they go down together to the bottom. The function of the blank holder 200 is to provide flow resistance when the material is drawn, and to control the material flow rate and flow rate. There are three ways to adjust the flow resistance, 1. Change the shape of the drawing rib and the drawing rib groove, 2. Adjust the height of the balance block 1 to change the blank holder gap, 3. Adjust the blank holder force of the press acting on the blank holder. Among them, the first way cannot be adjusted temporarily, it is long-term and fixed. Ways 2 and 3 can be adjusted temporarily.

[0031] In one embodiment of the present application, as Figure 2 , Figure 3 shown, the stamping die system includes an upper die 100, a lower die 300, a blank holder 200, and a press (not shown in the figure), the blank holder 200 is located between the upper die 100 and the lower die 300, and the press acts on the blank holder to provide a blank holder force.

[0032] Referring to Figure 2 , the stamping die system uses multiple laser displacement sensors 2 to monitor the drawing part material receiving line. By arranging laser displacement sensors 2 on the blank holder or concave die of the drawing die, the material receiving line is monitored. The laser displacement sensor 2 is parallel to the blank holder surface and emits into the return plate 400 edge to provide real-time position information. The laser spot diameter is less than or equal to the blank holder gap, so as to ensure that the laser emits. The laser displacement sensor 2 is placed in the area where the change of the material receiving line has a significant impact on the quality of the part based on the results of forming simulation analysis and / or big data analysis and / or experience. For the blank holder surface, it is required to consider or modify the die at the initial design stage, and the laser emitting section of the blank holder surface is a plane and cannot be a curved surface.

[0033] The stamping die system uses an automatic adjusting balance block 3 to replace the traditional balance block, which needs to be adjusted manually, the production line is stopped, and it takes a long time. The stamping die system of the present application uses an automatic adjusting balance block 3 to realize the automatic adjustment of the balance block. Preferably, the automatic adjusting balance block uses a turbine worm lifting mechanism, the turbine bears the pressure, and the worm is driven by a servo motor.

[0034] Referring to Figure 3 In one specific embodiment, the automatic adjusting balance block 3 comprises an upper base 33, a lower base 38, a servo motor 39, a worm 37, a worm wheel 35, a lead screw 32 and a pressure block 31. The lower base 38 is mounted on the binder 200, and a transmission cavity is formed between the upper base 33 and the lower base 38. The worm 37 and the worm wheel 35 are mounted in the transmission cavity and are in transmission connection. The servo motor 39 is arranged on one side of the base, and the servo motor 39 is in transmission connection with the worm 37. The inner ring of the worm wheel 35 is provided with a trapezoidal thread matched with the lead screw 32. The lead screw 32 is arranged vertically, and the pressure block 31 is fixed to the top end of the lead screw 32. The top surface of the pressure block 31 is a balance block pressure surface. The worm wheel 35 rotates to drive the lead screw 32 to move up and down, thereby adjusting the height of the balance block. More specifically, a pair of first bearings 36 are mounted on the base, and the two ends of the worm 37 are mounted in the base through the first bearings 36. A pair of second bearings 34 are mounted on the base, and the two ends of the worm wheel 35 are mounted in the base through the second bearings 34.

[0035] The controller of the stamping die system is electrically connected with the laser displacement sensor 2, the automatic adjusting balance block 3 and the press machine respectively. In one example, the controller adopts a PLC or a microcomputer, and the data information collected by the laser displacement sensor 2 is collected through the PLC or the microcomputer.

[0036] Specifically, the PLC or the microcomputer receives the material receiving line information collected by the laser sensor, obtains the material receiving line change amount in real time according to the material receiving line information, and issues a balance block and / or binder force adjusting instruction based on the material receiving line change amount and the pre-defined correlation between the material receiving line change amount and the height of each automatic adjusting balance block and / or the binder force. The binder force adjusting instruction issued by the PLC or the microcomputer is obtained by the production line press, and the adjustment is implemented. Secondary development is required in different press equipment. The PLC or the microcomputer issues a balance block adjusting instruction to the power regulator, the power regulator controls the servo motor 39, and the height of the pressure block 31 is adjusted through the worm and worm gear lifting mechanism. It can be understood that there are multiple balance blocks on the binder, and the algorithm for adjusting the balance blocks can be iteratively optimized in a machine learning manner. The adjustment amount of each balance block is different, and the adjustment amount of each die is different.

[0037] The PLC or the microcomputer collects the initial position of the plate in the forming process, the material receiving line inflow amount and the material receiving line inflow rate according to the material receiving line information, and the corresponding relationship between the initial position of the plate, the material receiving line inflow amount, the material receiving line inflow rate and the stamping time, the press stroke.

[0038] The PLC or microcomputer collects the final position of the material receiving line of each stroke forming part according to the material receiving line information, judges whether the final position of the material receiving line is within the allowable range according to the pre-defined standard final position of the material receiving line and the allowable fluctuation range, and issues an alarm instruction if the final position of the material receiving line is out of the range.

[0039] The PLC or microcomputer collects the data information collected by the laser sensor, and realizes three functions. One is to monitor the material receiving line in real time during the forming process, and to reveal the initial position of the plate material, the inflow amount or rate of the material receiving line and other information during the forming process, and the corresponding relationship with time or press stroke. Two is to collect the final position of the material receiving line of each stroke forming part, and to set the standard final position of the material receiving line and the allowable fluctuation range in the system by the user, and to issue an alarm if the range is exceeded. Three is that the PLC or microcomputer issues an automatic balance block adjustment instruction or a press pressure adjustment instruction according to the change of the material receiving line. If the material receiving line becomes longer, an automatic balance block raising (or pressure reducing) instruction is issued; if the material receiving line becomes shorter, an automatic balance block lowering (or pressure increasing) instruction is issued. The change amount of the material receiving line and the corresponding adjustment amount are set by the user in the system or are iteratively optimized according to the algorithm.

[0040] The above is only the preferred embodiment of the present application, which is only illustrative but not limiting. The structure and connection mode of the components in the present application can be changed, and any equivalent transformation and improvement based on the technical scheme of the present application should not be excluded from the protection scope of the present application.

Claims

1. A punch die system comprising an upper die, a lower die, a blank holder and a press, the blank holder being located between the upper die and the lower die, the press acting on the blank holder to provide a blank holder force, characterised in that, The stamping die system further comprises at least one laser displacement sensor, a plurality of automatic adjusting balance blocks and a controller; The laser displacement sensor is installed on the upper die or the blank holder for collecting position information of a specific part of the material receiving line of each stroke forming part; the specific part of the material receiving line is located at a part where the change of the material receiving line has a significant impact on the quality of the part, and the part is determined based on the results of forming simulation analysis and / or big data analysis and / or experience; The automatic adjusting balance block is installed on the blank holder; The controller is electrically connected or communicatively connected with the laser displacement sensor, the automatic adjusting balance block and the press, respectively; the controller controls the automatic adjusting balance block to adjust the lifting and / or adjust the blank holding force of the press on the blank holder based on the position information of the material receiving line collected by the laser displacement sensor.

2. A stamping die system as defined in claim 1, wherein, The laser displacement sensor is also used to collect the initial position information of the sheet metal, the inflow amount information of the material receiving line and the inflow rate information of the material receiving line.

3. A stamping die system as defined in claim 2, wherein, The automatic adjusting balance block comprises a base, a motor, a worm, a worm gear, a lead screw and a pressure receiving block; the base is installed on the blank holder, and a transmission cavity is arranged in the base; the worm and the worm gear are installed in the transmission cavity and are in transmission connection; the motor is arranged on one side of the base and is in transmission connection with the worm; the inner ring of the worm gear is provided with trapezoidal threads matched with the lead screw; the lead screw is vertically arranged; the pressure receiving block is fixed to the top end of the lead screw, and the top surface of the pressure receiving block is a pressure receiving surface of the balance block.

4. A stamping die system as defined in claim 1, wherein, The pressure surface of the laser emitting section of the laser displacement sensor is a plane.

5. A stamping die system as defined in claim 1, wherein, The diameter of the laser spot of the laser displacement sensor is less than or equal to the gap between the pressure surfaces.

6. A control method of a press die system employing the press die system according to claim 3, characterized by, The method comprises the following steps: Step one: based on the results of forming simulation analysis and / or big data analysis and / or experience, determine the part of the material receiving line where the change has a significant impact on the quality of the part, and arrange the laser displacement sensor according to the part to monitor the material receiving line of the part; Step two: the controller receives the material receiving line information collected by the laser sensor, obtains the change amount of the material receiving line in real time according to the information, and issues balance block and / or blank holding force adjustment instructions based on the change amount of the material receiving line and the pre-defined correlation between the change amount of the material receiving line and the height of each automatic adjusting balance block and / or the blank holding force; Step three: the automatic adjusting balance block and / or the press adjusts the lifting of the balance block and / or the size of the blank holding force according to the adjustment instructions.

7. The control method of a press system according to claim 6, wherein In step two, the controller collects the initial position of the sheet metal, the inflow amount and the inflow rate of the material receiving line during the forming process, and the corresponding relationship between the initial position of the sheet metal, the inflow amount and the inflow rate of the material receiving line and the stamping time and the press stroke according to the material receiving line information.

8. A method of controlling a press system as claimed in claim 6 or 7, characterized in that, In step two, the controller collects the final position of the material receiving line of each stroke forming part according to the material receiving line information, judges whether the final position of the material receiving line is within the allowable range according to the pre-defined standard final position of the material receiving line and the allowable fluctuation range, and issues an alarm instruction if it is out of range.

9. The control method of a press system according to claim 6, wherein In the second step, the pre-defined relationship between the change of the material receiving line and the height of the self-adjusting balance block and / or the blank holder force is set manually or optimized iteratively according to a computer algorithm.

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