Simulation method for stamping force of drawing die, storage medium and equipment

Abstract

The invention relates to the technical field of drawing die stamping force simulation, in particular to a drawing die stamping force simulation method, a storage medium and equipment. The method comprises the step that the total tonnage of the drawing die is obtained through CAE software simulation according to the formula: drawing die total tonnage = terminating force * K1 + initial material pressing force * K2. Computer program instructions are stored on the storage medium, and the method is implemented when the computer program instructions are executed by a processor. The apparatus includes at least one processor, at least one memory, and computer program instructions stored in the memory, the method being implemented when the computer program instructions are executed by the processor. The problem that according to an existing drawing die tonnage calculation method, it is difficult to achieve that pressing force is matched with different pressure sources can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of drawing die punching pressure simulation, and in particular to a drawing die punching pressure simulation method, storage medium and equipment. Background Art

[0002] When developing new auto parts products, it is necessary to plan the production line to ensure normal production. However, the surface of auto parts is complex, and it is difficult to achieve the ideal state during the actual mold (such as drawing mold) debugging process, which causes a deviation between the theoretically calculated pressure and the actual required pressure. When the deviation value is large, it may even reach more than 200 tons, resulting in the tonnage exceeding the equipment's tolerance range, causing damage to the equipment or even destruction.

[0003] Traditionally, the drawing die pressure is calculated by the empirical formula based on the circumference of the blank holder and the size of the product blank. The existing drawing die pressure is mainly calculated by CAE software simulation, directly using the pressure in the CAE software, or multiplying the pressure in the CAE software by a coefficient. Figure 1 Generally speaking, the force of the drawing die consists of two parts. One part is the pressure generated by the forming of the product blank A between the die 1 (the upper die seat 2 and the punch slide 3 are arranged in sequence at the top of the die 1) and the punch 4 (the lower die seat 5 and the punch table 6 are arranged in sequence at the bottom of the punch 4) when the drawing die is in the closed state. This pressure is also called the forming force; the other part is the pressing force between the blank holder 7 and the die 1 on the product blank A, which is provided by the pressure source 8 of the blank holder 7. At present, the pressure source 8 of the blank holder 7 mainly includes the die pad of the punch press and the nitrogen spring, and the die pad of the punch press is divided into two types: hydraulic pad and air pad. The pressure source 8 is set between the blank holder 7 and the lower die seat 5. The current calculation method of the total tonnage of the drawing die is: total tonnage = forming force × coefficient + pressing force.

[0004] In the existing calculation method of the total tonnage of the drawing die, the algorithm for the forming force is roughly the same in the industry, which is mainly obtained through CAE software simulation, and then the coefficient is adjusted according to the research and development level of each company and production experience. The pressing force is one of the guiding parameters during production. Before starting production, the corresponding pressing force needs to be set first. The pressing force set here is the "initial pressing force". The pressing force comes from the pressure source. There are great differences in the pressure curves between different pressure sources. Using the same initial pressing force, there are obvious differences in the inflow of materials and the total tonnage of the mold, which makes the product quality poor during the first proofing and the total tonnage exceeds the maximum allowable value of the machine tool. In addition, the size of the pressing force of the drawing die will be different when set on different equipment, resulting in large deviations after changing the equipment. At present, the calculation method of the pressing force in the industry is too simple. If you want to improve the accuracy, you must innovate in the algorithm of the pressing force to match different pressure sources.

[0005] In summary, it is necessary to develop a simulation method, storage medium and equipment for the punching pressure of a drawing die to solve the problem that the existing drawing die tonnage calculation method is difficult to match the punching force with different pressure sources. Summary of the invention

[0006] The present invention aims to provide a method, storage medium and device for simulating the drawing die punching pressure. The specific technical scheme is as follows:

[0007] In a first aspect, the present invention provides a method for simulating a drawing die punching pressure, comprising:

[0008] CAE software is used to simulate the final forming force between the die and the punch during the stamping process, and the final forming force is obtained by multiplying the factor K1.

[0009] CAE software is used to simulate the final pressing force and initial pressing force generated by the blank holder pressure source during the stamping process, and the final pressing force is amplified by a factor of K2 times the initial pressing force;

[0010] Using CAE software simulation, we can get: total tonnage of drawing die = end force × K1 + initial pressing force × K2;

[0011] Among them, the value of K1 is 1.4; when the pressure source of the blank holder ring is a pneumatic pressure source, the value of K2 is 1.4-1.5; when the pressure source of the blank holder ring is a hydraulic pressure source, the value of K2 is 1.0.

[0012] Optionally, the component providing the pneumatic pressure source includes an air cushion or a nitrogen spring.

[0013] Optionally, the compression stroke corresponding to the terminal pressing force generated by the nitrogen spring during the stamping process is 80%-90% of its maximum compression stroke.

[0014] Optionally, the component providing the hydraulic pressure source includes a hydraulic pad.

[0015] In a second aspect, the present invention provides a storage medium having computer program instructions stored thereon, which implement the method for simulating the drawing die punching pressure when the computer program instructions are executed by a processor.

[0016] In a third aspect, the present invention provides a device comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, which implement the method for simulating the drawing die punching pressure when the computer program instructions are executed by the processor.

[0017] The application of the technical solution of the present invention has at least the following beneficial effects:

[0018] The present invention provides a drawing die punching pressure simulation method, storage medium and device, which can solve the problem that the existing drawing die tonnage calculation method is difficult to achieve the matching of pressing force with different pressure sources. Specifically, the present invention adopts CAE software simulation to obtain: total tonnage of drawing die = termination force × K1 + initial pressing force × K2; wherein, K1 takes a value of 1.4; when the pressure source of the blank holder is a pneumatic pressure source, K2 takes a value of 1.4-1.5; when the pressure source of the blank holder is a hydraulic pressure source, K2 takes a value of 1.0; that is, the present invention classifies the pressure sources by introducing the coefficient K2, and realizes the matching of the pressing force with different pressure sources, which not only makes the theoretical pressing force more instructive, but also allows the mold to be tested directly according to the theoretical pressing force when debugging the mold, without the need to repeatedly test and adjust the pressing force, and also makes the actual mold testing conditions consistent with the theoretical parameters, so that the product rebound will be closer to the theory, which has a positive effect on subsequent precision rectification; the present invention adopts an improved simulation method of the total tonnage of drawing dies, which can more accurately calculate the total tonnage, reduce the replacement of punch presses due to insufficient total tonnage, or avoid the situation where the actual pressure exceeds the theoretical pressure too much and the punch press planned in the early stage cannot be used.

[0019] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 It is a structural schematic diagram of the drawing die in the closed state in the background technology;

[0022] Among them, 1. die; 2. upper die seat; 3. punch slide; 4. punch; 5. lower die seat, 6. punch table, 7. pressure ring, 8. pressure source, A, product blank. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0024] Embodiment 1:

[0025] A method for simulating drawing die punching pressure, comprising:

[0026] CAE software is used to simulate the final forming force between the die and the punch during the stamping process, and the final forming force is obtained by multiplying the factor K1.

[0027] CAE software is used to simulate the final pressing force and initial pressing force generated by the blank holder pressure source during the stamping process, and the final pressing force is amplified by a factor of K2 times the initial pressing force;

[0028] Using CAE software simulation, we can get: total tonnage of drawing die = end force × K1 + initial pressing force × K2;

[0029] Among them, the value of K1 is 1.4; when the pressure source of the blank holder ring is a pneumatic pressure source, the value of K2 is 1.4; when the pressure source of the blank holder ring is a hydraulic pressure source, the value of K2 is 1.0.

[0030] Specifically, the end force is 656 tons; the initial pressing force is 95 tons. The end forming force = 656 × 1.4 = 918.4 tons, the pressure source of the blank holder is a pneumatic pressure source (such as an air cushion), K2 is 1.4, and the end pressing force = 95 × 1.4 = 133 tons. The total tonnage of the drawing die simulated by the CAE software = 918.4 + 133 = 1054.4 tons. The total tonnage of the drawing die in actual operation is 1050 tons, which is basically consistent with the simulation results of the CAE software. At the same time, the first sample qualification rate of the product reaches 97%.

[0031] Comparative Example 1:

[0032] A method for simulating drawing die punching pressure, comprising:

[0033] CAE software is used to simulate the final forming force between the die and the punch during the stamping process, and the final forming force is obtained by multiplying the factor K1.

[0034] CAE software is used to simulate the initial pressing force generated by the blank holder pressure source during the stamping process;

[0035] Using CAE software simulation, we can get: total tonnage of drawing die = end force × K1 + initial pressing force;

[0036] Among them, the value of K1 is 1.4.

[0037] Specifically, the final force is 594 tons, and the initial pressing force is 110 tons. Final forming force = 594 × 1.4 = 831.6 tons, and the total tonnage of the drawing die simulated by CAE software = 831.6 + 110 = 941.6 tons.

[0038] In actual operation, the actual pressure source of the blank holder is a nitrogen spring with an initial force of 110 tons. The total tonnage of the drawing die is 1,000 tons. The difference with the CAE software simulation result exceeds 58.4 tons, and the first sample qualification rate of the product is only 34%.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for simulating drawing die punching pressure, characterized in that: include: CAE software is used to simulate the final forming force between the die and the punch during the stamping process, and the final forming force is obtained by multiplying the factor K1. CAE software is used to simulate the final pressing force and initial pressing force generated by the blank holder pressure source during the stamping process, and the final pressing force is amplified by a factor of K2 times the initial pressing force; Using CAE software simulation, we can get: total tonnage of drawing die = end force × K1 + initial pressing force × K2; Among them, the value of K1 is 1.4; when the pressure source of the blank holder ring is a pneumatic pressure source, the value of K2 is 1.4-1.5; when the pressure source of the blank holder ring is a hydraulic pressure source, the value of K2 is 1.

0.

2. The method for simulating the drawing die punching pressure according to claim 1, characterized in that: The components providing the gas pressure source include air cushions or nitrogen springs.

3. The method for simulating the drawing die punching pressure according to claim 2, characterized in that: The compression stroke corresponding to the terminal pressing force generated by the nitrogen spring during the stamping process is 80%-90% of its maximum compression stroke.

4. The method for simulating the drawing die punching pressure according to claim 1, characterized in that: Components providing the hydraulic pressure source include hydraulic pads.

5. A storage medium, characterized in that: Computer program instructions are stored thereon, and when the computer program instructions are executed by a processor, a method for simulating the drawing die punching pressure as described in any one of claims 1 to 4 is implemented.

6. A device, characterized in that: include: At least one processor, at least one memory and computer program instructions stored in the memory, when the computer program instructions are executed by the processor, a method for simulating the drawing die punching pressure as claimed in any one of claims 1 to 4 is implemented.

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