Stamping die system and control method thereof

Abstract

The invention relates to the technical field of stamping forming, in particular to a stamping die system and a control method thereof. The mold system comprises at least one laser displacement sensor, a plurality of self-adjusting counterbalances and a controller. The laser displacement sensor is installed on the upper die or the blank holder and used for collecting position information of a specific part of a material collecting line of a formed part in each stroke. And the automatic adjusting balance block is arranged on the blank holder. The controller is connected with the laser displacement sensor, the automatic adjusting balance block and the pressing machine. And the controller is used for controlling the automatic adjusting balance block to perform lifting adjustment and / or adjusting the blank holder force of the pressing machine acting on the blank holder based on the position information of the material receiving line from the laser distance measuring sensor. According to the invention, self-adaptive adjustment aiming at the receiving wire can be realized, the receiving wire is monitored, the change rule of the drawing forming receiving wire is disclosed, production parameters are adjusted before unqualified products are produced, and the stability of the production process is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of stamping and forming, and in particular to a stamping die system and a control method thereof. Background Art

[0002] Due to the changes in sheet material properties, external temperature, sheet material roughness and lubrication conditions, as well as the influence of factors such as the increase in mold temperature during continuous production, stamping parts have different forming processes and quality states between batches of mass production or in the "first, middle and last" process of the same batch, which are often manifested as defects with obvious differences in necking cracking or wave wrinkling. Therefore, in the production process, it is often necessary to adjust production parameters such as drawing blank holding force and balance block to produce qualified parts.

[0003] At present, the adjustment of parameters in this production process is passive, and technicians often adjust certain parameters based on experience after producing defective parts. This adjustment method is delayed, and defective products have already been produced, resulting in failure costs. In addition, the adjustment process relies on experience, the adjustment amount is inaccurate, and multiple adjustments are required to achieve the desired effect.

[0004] In view of the above problems, the inventors of the present invention finally obtained the present invention after a long period of research and practice. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a stamping die system and a control method thereof, which monitors the production process variables, identifies subtle changes that may lead to the production of defective products, adjusts the production parameters before the defective products are produced, adapts to changes in conditions, ensures the stability of the production process, reduces the production of defective products, and reduces downtime in the production process.

[0006] The technical solution adopted by the present invention is:

[0007] On the one hand, a stamping die system is provided, comprising an upper die, a lower die, a blank holder and a press, wherein the blank holder is located between the upper die and the lower die, and the press acts on the blank holder to provide a blank holder force; the stamping die system further comprises at least one laser displacement sensor, a plurality of automatic adjustment 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 the receiving line of each stroke forming part;

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

[0010] The controller is electrically or communicatively connected to the laser displacement sensor, the automatic adjustment balance block and the press respectively; the controller controls the automatic adjustment balance block to perform lifting and lowering adjustment and / or adjust the blank holding force exerted by the press on the blank holding ring based on the receiving line position information from the laser ranging sensor.

[0011] Furthermore, the laser displacement sensor is also used to collect information on the initial position of the sheet material, information on the amount of material flowing into the receiving line, and information on the rate of material flowing into the receiving line.

[0012] Furthermore, the automatic adjustment balancing block includes a base, a motor, a worm, a worm wheel, a lead screw and a pressure block. The base is installed on the pressure ring. A transmission cavity is provided inside the base. The worm and the worm wheel are installed in the transmission cavity and are transmission connected. The motor is arranged on one side of the base. The motor is transmission connected to the worm. The inner ring of the worm wheel is provided with a trapezoidal thread to cooperate with the lead screw. The lead screw is vertically arranged. The pressure block is fixed at the top end of the lead screw. The top surface of the pressure block is the pressure surface of the balancing block.

[0013] Furthermore, based on the molding simulation analysis results and / or big data analysis results and / or experience, the position of the receiving line where the laser displacement sensor detects is determined, and the position is located where the change of the receiving line has a significant impact on the quality of the parts.

[0014] Furthermore, the pressing surface of the laser incident section of the laser displacement sensor is a plane.

[0015] Furthermore, the laser spot diameter of the laser displacement sensor is smaller than or equal to the gap between the pressing surfaces.

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

[0017] Step 1: Based on the molding simulation analysis results and / or big data analysis results and / or experience, determine the location where the change of the part receiving line has a significant impact on the part quality, and arrange laser displacement sensors according to the location to monitor the part receiving line;

[0018] Step 2: The controller receives the receiving line information collected by the laser sensor, obtains the receiving line change in real time according to the receiving line information, and issues a balancing block and / or blank holder force adjustment instruction based on the receiving line change and a predefined correlation between the receiving line change and each automatically adjusted balancing block height and / or blank holder force;

[0019] Step three: the automatic adjustment balancing block and / or press machine performs lifting and lowering adjustment of the balancing block and / or the size of the blank holding force according to the adjustment instruction.

[0020] Furthermore, the step two also includes: the controller collects the initial position of the sheet material, the inflow amount of the receiving line and the inflow rate of the receiving line during the forming process according to the receiving line information, as well as the correspondence between the initial position of the sheet material, the inflow amount of the receiving line, the inflow rate of the receiving line and the stamping time and the press stroke.

[0021] Furthermore, the step two also includes: the controller collects the final position of the receiving line of each stroke forming part according to the receiving line information, and determines 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 command if it exceeds the range.

[0022] Furthermore, in the step 2, the predefined correlation between the change amount of the receiving line and the height of each automatically adjusted balancing block and / or the blank holding force is manually set or iteratively optimized according to a computer algorithm.

[0023] The punching die system and control method of the present invention can realize adaptive adjustment for the receiving line, monitor the receiving line, and reveal the change law of the drawing forming receiving line. The automatic balancing block has a fast adjustment speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0026] Figure 2 A schematic diagram showing the arrangement of laser displacement sensors of a stamping die system according to an embodiment of the present invention is shown;

[0027] Figure 3 A schematic structural diagram of an automatic adjustment balancing weight according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0028] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0029] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". Other explicit and implicit definitions may also be included below.

[0030] like Figure 1 As shown, in the current stamping process, the stamping die includes an upper die 100, a lower die 300 and a blank holder 200. The first process - drawing: the flat sheet is drawn and deformed to form a shaped part. In single-action drawing, the blank holder 200 lifts up to support the sheet, and the upper die 100 moves downward and closes with the blank holder 200, and moves downward together to draw to the bottom. The function of the blank holder 200 is to provide flow resistance during material drawing and control the amount and rate of material inflow. There are three ways to adjust the flow resistance: 1. Change the shape of the draw ribs and the draw rib grooves, 2. Adjust the height of the balance block 1 to change the gap between the press surfaces, and 3. Adjust the blank holder force of the press on the blank holder. Among them, the first method cannot be adjusted temporarily and is long-term and fixed. Methods 2 and 3 can be adjusted temporarily.

[0031] In one embodiment of the present invention, Figure 2 , Figure 3 As 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 holding force.

[0032] See also Figure 2 The stamping die system uses multiple laser displacement sensors 2 to monitor the receiving line of the drawn parts. The receiving line is monitored by arranging laser displacement sensors 2 on the blank holder or die of the drawing die. The laser displacement sensor 2 is injected parallel to the blanking surface and returns the real-time position information of the edge of the sheet 400. The laser spot diameter is less than or equal to the blanking surface gap to ensure laser injection. The placement of the laser displacement sensor 2 is based on the molding simulation analysis results and / or big data analysis results and / or experience, and is placed in the area where the change of the receiving line has a significant impact on the quality of the part. For the blanking surface, it is required to consider it in the initial design stage or modify the mold later. The blanking surface of the laser injection section is a plane and cannot be a curved surface.

[0033] The stamping die system adopts an automatic adjustment balance block 3 to replace the traditional balance block. The traditional balance block needs manual adjustment, which stops the production line and takes a long time. The stamping die system of the present invention adopts an automatic adjustment balance block 3 to realize automatic adjustment of the balance block. Preferably, the automatic adjustment balance block adopts a turbine worm lifting mechanism, the turbine bears pressure, and the worm is driven by a servo motor.

[0034] See also Figure 3 In a specific embodiment, the automatic adjustment balancing block 3 includes 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 pressure ring 200, 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 transmission-connected, the servo motor 39 is arranged on one side of the base, the servo motor 39 is transmission-connected with the worm 37, the inner ring of the worm wheel 35 is provided with a trapezoidal thread to cooperate with the lead screw 32, the lead screw 32 is vertically arranged, the pressure block 31 is fixed on the top of the lead screw 32, and the top surface of the pressure block 31 is the pressure surface of the balancing block. The worm wheel 35 rotates to drive the lead screw 32 to move up and down, so as to achieve the height adjustment of the balancing block. More specifically, a pair of bearings 36 are installed on the base, and the two ends of the worm 37 are installed in the base through the bearings 36. A pair of bearings 34 are mounted on the base, and both ends of the worm wheel 35 are mounted in the base through the bearings 34 .

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

[0036] Specifically, the PLC or microcomputer receives the receiving line information collected by the laser sensor, obtains the receiving line change in real time based on the receiving line information, and issues a balancing block and / or blanking force adjustment instruction based on the receiving line change and the predefined relationship between the receiving line change and each automatically adjusted balancing block height and / or blanking force. The blanking force adjustment instruction issued by the PLC or microcomputer is obtained by the production line press, and the adjustment is implemented, which requires secondary development in different press equipment. The PLC or microcomputer sends a balancing block adjustment instruction to the power regulator, and the power regulator controls the servo motor 39 to adjust the height of the pressure block 31 through the worm gear lifting mechanism. It can be understood that there are multiple balancing blocks on the blanking ring, and the algorithm for adjusting the balancing blocks can be iteratively optimized based on machine learning. The adjustment amount of each balancing block is different, and the adjustment amount of each mold is different.

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

[0038] The PLC or microcomputer collects the final position of the receiving line of each stroke-formed part based on the receiving line information, and determines whether the final position of the receiving line is within the allowable range based on the pre-defined standard receiving line final position and the allowable fluctuation range. If it exceeds the range, an alarm command is issued.

[0039] The data information collected by the laser sensor is collected through PLC or microcomputer to achieve three functions. 1. Real-time monitoring of the receiving line of the forming process to reveal the initial position of the sheet metal, the inflow or rate of the receiving line, and the corresponding relationship with time or press stroke during the forming process. 2. Collect the final position of the receiving line of each stroke-formed part. The user sets the standard final position of the receiving line and the allowable fluctuation range in the system, and an alarm is issued if the range is exceeded. 3. PLC or microcomputer issues automatic balancing block adjustment instructions or press pressure adjustment instructions based on the changes in the receiving line. When the receiving line becomes longer, an automatic balancing block increase (or pressure reduction) instruction is issued; when the receiving line becomes shorter, an automatic balancing block decrease (or pressure increase) instruction is issued. The change in the receiving line and the corresponding adjustment amount are set by the user in the system or optimized according to algorithm iteration.

[0040] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. The structures and connection modes of the components in the present invention can be changed, and any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A stamping die system, comprising an upper die, a lower die, a blank holder and a press, wherein the blank holder is located between the upper die and the lower die, and the press acts on the blank holder to provide a blank holder force, characterized in that: The stamping die system also includes at least one laser displacement sensor, a plurality of automatically adjustable balancing blocks and a controller; 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 the receiving line of each stroke forming part; The automatic adjustment balance block is installed on the blank holder; The controller is electrically or communicatively connected to the laser displacement sensor, the automatic adjustment balance block and the press respectively; the controller controls the automatic adjustment balance block to perform lifting and lowering adjustment and / or adjust the blank holding force exerted by the press on the blank holding ring based on the receiving line position information from the laser ranging sensor.

2. A stamping die system according to claim 1, characterized in that: The laser displacement sensor is also used to collect information on the initial position of the sheet material, information on the inflow amount of the receiving line, and information on the inflow rate of the receiving line.

3. A stamping die system as claimed in claim 2, characterized in that: The automatic adjustment balancing block includes a base, a motor, a worm, a worm wheel, a lead screw and a pressure block. The base is installed on the pressure ring. A transmission cavity is provided inside the base. The worm and the worm wheel are installed in the transmission cavity and are transmission connected. The motor is arranged on one side of the base. The motor is transmission connected to the worm. The inner ring of the worm wheel is provided with a trapezoidal thread to cooperate with the lead screw. The lead screw is vertically arranged. The pressure block is fixed on the top end of the lead screw. The top surface of the pressure block is the pressure surface of the balancing block.

4. A stamping die system as claimed in claim 3, characterized in that: Based on the molding simulation analysis results and / or big data analysis results and / or experience, the position of the receiving line detected by the laser displacement sensor is determined, and the position is located at a position where the change of the receiving line has a significant impact on the quality of the parts.

5. A stamping die system according to claim 1, characterized in that: The material pressing surface of the laser incident section of the laser displacement sensor is a plane.

6. A stamping die system according to claim 1, characterized in that: The laser spot diameter of the laser displacement sensor is smaller than or equal to the gap between the pressing surfaces.

7. A method for controlling a stamping die system, using the stamping die system according to claim 4, characterized in that: The steps include: Step 1: Based on the molding simulation analysis results and / or big data analysis results and / or experience, determine the location where the change of the part receiving line has a significant impact on the part quality, and arrange laser displacement sensors according to the location to monitor the part receiving line; Step 2: The controller receives the receiving line information collected by the laser sensor, obtains the receiving line change in real time according to the receiving line information, and issues a balancing block and / or blank holder force adjustment instruction based on the receiving line change and a predefined correlation between the receiving line change and each automatically adjusted balancing block height and / or blank holder force; Step three: the automatic adjustment balancing block and / or press machine performs lifting and lowering adjustment of the balancing block and / or the size of the blank holding force according to the adjustment instruction.

8. A method for controlling a stamping die system according to claim 7, characterized in that: The step 2 also includes: the controller collects the initial position of the sheet material, the inflow amount of the receiving line and the inflow rate of the receiving line during the forming process according to the receiving line information, as well as the correspondence between the initial position of the sheet material, the inflow amount of the receiving line, the inflow rate of the receiving line and the stamping time and the press stroke.

9. A method for controlling a stamping die system according to claim 7 or 8, characterized in that: The step 2 also includes: the controller collects the final position of the receiving line of each stroke forming part according to the receiving line information, and determines 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 command if it exceeds the range.

10. A control method for a stamping die system according to claim 7, characterized in that: In the step 2, the relationship between the predefined change amount of the receiving line and the height of each automatically adjusted balancing block and / or the blank holding force is manually set or iteratively optimized according to a computer algorithm.

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