A method for blanking and debugging of a sensor diaphragm

Abstract

The present invention relates to a method for blanking and debugging a sensor diaphragm, belonging to the technical field of machining, and includes: debugging blanking, checking the wrinkling condition of the diaphragm at the initial stage of the punch stroke and in the middle and late stages of the punch stroke respectively; if the wrinkling of the diaphragm occurs at the initial stage of the punch stroke, adjusting the initial blank-holding force of the blank-holder ring, and if the wrinkling of the diaphragm occurs in the middle and late stages of the punch stroke, then adjusting the speed of the punch and / or increasing the hardness of the polyurethane, and continuing to carry out debugging blanking after adjustment until the wrinkling phenomenon is eliminated; realizing targeted adjustment of blanking parameters for the cases where wrinkling occurs at different times, thereby being able to quickly determine appropriate blanking parameters and reducing the consumption of manpower, material resources and time.

Description

Technical Field

[0001] The present invention relates to the technical field of machining, and particularly to a method for blanking and debugging of a sensor diaphragm. Background Art

[0002] The diaphragm blanking process is a machining method that uses a die to stamp and form a diaphragm material, and is widely used in fields such as electronics, automotive, and medical. Its working principle is to apply pressure to the diaphragm material through a punching press and a die to separate or deform it, so as to obtain parts with the required shape and size.

[0003] During the blanking process, the wrinkling phenomenon is a common technical problem. Wrinkling not only affects the appearance quality of the product, but also reduces the forming accuracy of the material, and even leads to product scrapping, increasing production costs.

[0004] Existing solutions mostly adopt the trial-and-error method, adjusting the maximum blanking pressure and the die, and making multiple adjustments to different parameters until a product with qualified quality is obtained. However, this method requires a large amount of human, material, and time costs for a large number of process influencing factors.

[0005] Therefore, there is an urgent need for a method for blanking and debugging of a sensor diaphragm that can quickly determine the blanking parameters. Summary of the Invention

[0006] To solve the above problems, the present invention provides a method for blanking and debugging of a sensor diaphragm, which determines in which period the wrinkling phenomenon occurs through debugging blanking, and according to the time when the wrinkling occurs, makes targeted debugging of the blanking parameters to obtain the best blanking parameters, thereby reducing the time required for adjusting the blanking parameters.

[0007] To achieve the above object, the present invention provides the following solution:

[0008] A method for blanking and debugging of a sensor diaphragm, comprising:

[0009] Step S1: Determine the initial blank holding force P of the blank holder according to the physical properties of the sheet material to be blanked;

[0010] Step S2: Determine the initial hardness of the polyurethane;

[0011] Step S3: The blank holder compresses the sheet material to be blanked with the initial blank holding force, and the punch punches the sheet material at an initial speed k0 to form a diaphragm. If wrinkles exist at the edge of the diaphragm, go to Step S4;

[0012] Step S4: Debug the blanking. The debugging blanking process includes the initial stage of the punch stroke and the middle and late stages of the punch stroke; check the wrinkling situation of the diaphragm respectively in the initial stage of the punch stroke and the middle and late stages of the punch stroke;

[0013] If the wrinkling of the diaphragm occurs at the initial stage of the punch stroke, after increasing the blank holding force of the blank holder, the debugging blanking is carried out again until the wrinkling phenomenon is eliminated at the initial stage of the punch stroke, and then the suitable blank holding force of the blank holder is determined;

[0014] If the wrinkling of the diaphragm occurs in the middle and later stages of the punch stroke, adjust the speed of the punch and / or carry out the debugging blanking again after increasing the hardness of the polyurethane until the wrinkling phenomenon is eliminated in the middle and later stages of the punch stroke, and then determine the suitable speed of the punch and / or the suitable hardness of the polyurethane;

[0015] Step S5: Solidify the process.

[0016] Preferably, in the step S1, determining the initial blank holding force P of the blank holder includes:

[0017] According to the formula:

[0018] , 15≤a≤35; 0.0024≤b≤0.0048; 0.0028≤c≤0.0036; determine the initial blank holding force P;

[0019] wherein, t is the thickness of the sheet material to be blanked, E is the elastic modulus of the sheet material to be blanked, σ is the yield strength of the sheet material to be blanked, a, b, and c are the weights of the sheet thickness, elastic modulus, and yield strength respectively, and P max is the maximum blank holding force provided by the blank holder when the sheet material has not been deformed due to the extrusion of the blank holder.

[0020] Preferably, when d2 - d1 ≤ 0.9d, it is the diaphragm forming stage, and when 0.9d < d2 - d1 ≤ d, it is the diaphragm cutting stage; wherein, d is the stroke difference between the punch and the blank holder when the diaphragm blanking is completed, d1 is the stroke of the blank holder, d2 is the stroke of the punch, and in the step S4:

[0021] d2 - d1 ≤ 0.9d / n is the initial stage of the punch stroke, and the middle and later stages of the punch stroke include the diaphragm cutting stage, where n is a positive integer not less than 4.

[0022] Preferably, in the step S4:

[0023] Preliminarily set the movement speed k 11 of the blank holder = k 12 = 0, the movement speed k 21 of the punch = 0.9k max , k 22 = k max , n = 4; and carry out blanking, wherein, k 11 is the movement speed of the blank holder in the diaphragm forming stage, and k 12is the moving speed of the blank holder during the diaphragm cutting stage, k 21 is the moving speed of the punch during the diaphragm forming stage, k 22 is the moving speed of the punch during the diaphragm cutting stage;

[0024] If wrinkling of the diaphragm occurs at the initial stage of the punch stroke, increasing the blank holding force of the blank holder includes:

[0025] Making the blank holding force of the blank holder increase according to the formula Δs = k 11 *t 11 where Δs is the stroke when the blank holding force of the blank holder increases, k 11 = 0.9k 21 , t 11 is the moving duration of the blank holder during the diaphragm forming stage, t 11 The initial value of is 0.01 * 0.9d / n / k 21 , if there is still wrinkling at the initial stage of the punch stroke after increasing the blank holding force of the blank holder, then the previous t 11 will increase in a trend of 5% - 10% until the wrinkling at the initial stage of the punch stroke is eliminated.

[0026] Preferably, when n = 4, in the middle and later stages of the punch stroke, it also includes 0.9d3 / 4 < d2 - d1 ≤ 0.9d.

[0027] Preferably, adjusting the speed of the punch includes: increasing k 21 at the stage of 0.9d3 / 4 < d2 - d1 ≤ 0.9d in a trend of 5% - 10% until the wrinkling in the middle and later stages of the punch stroke is eliminated.

[0028] Preferably, the diaphragm forming stage is divided into n equal segments, and the punch should be stationary for ∆t 2i , ∆t 2i = 0.1t 2i , t 2i = 1 / n * (0.9d / k 21 ), where t 2i is the moving duration of the punch in each segment.

[0029] Preferably, before step S5, it also includes:

[0030] When the diaphragm does not wrinkle, check the blanking corrugation quality s and h, where s is the warping degree and h is the forming wave height;

[0031] If s is greater than 100μm and / or h does not reach 95% of the design requirements, then the initially set k 21Decrease in the trend of 5%-10%, or increase n until s is less than or equal to 100 μm and h reaches 95% of the design requirements;

[0032] If s is less than or equal to 100 μm and h reaches 95% of the design requirements, no adjustment is required.

[0033] Preferably, when d2 - d1 ≤ 0.9d, it is the diaphragm forming stage, and when 0.9d < d2 - d1 ≤ d, it is the diaphragm cutting stage; where d is the stroke difference between the punch and the blank holder when the diaphragm blanking is completed, d1 is the stroke of the blank holder, d2 is the stroke of the punch, and in the step S4:

[0034] When d2 - d1 ≤ 0.2d, it is the initial stage of the punch stroke, and when d2 - d1 > 0.7d, it is the middle and later stages of the punch stroke.

[0035] Preferably, in the step S4:

[0036] Preliminarily set the blank holder k 11 = k 12 = 0, the punch k 21 = k 22 = k max ; and perform blanking, where k 11 is the movement speed of the blank holder in the diaphragm forming stage, k 12 is the movement speed of the blank holder in the diaphragm cutting stage, k 21 is the movement speed of the punch in the diaphragm forming stage, k 22 is the movement speed of the punch in the diaphragm cutting stage;

[0037] If wrinkling of the diaphragm occurs in the initial stage of the punch stroke, increasing the blank holding force of the blank holder includes: making the blank holder pressure increase according to the formula Δs = k 11 *t 11 , where Δs is the stroke when the blank holder increases pressure, k 11 = 0.9k 21 , t 11 is the movement duration of the blank holder in the diaphragm forming stage, and the initial value of t 11 is 0.01d / k max . If wrinkling still exists in the initial stage of the punch stroke after increasing the blank holding force of the blank holder, then increase the previous t 11 in the trend of 5%-10% until wrinkling in the initial stage of the punch stroke is eliminated.

[0038] The present invention has achieved the following technical effects compared with the prior art:

[0039] In the sensor diaphragm blanking debugging method disclosed by the present invention, blanking is performed on the sheet material with a certain initial blank holding force and polyurethane hardness, and the punch performs blanking at the maximum blanking speed. When wrinkles appear on the diaphragm, the stroke of the punch during blanking is divided into the initial stage of the punch stroke and the middle and later stages of the punch stroke. The wrinkling situation of the diaphragm is checked respectively in the initial stage of the punch stroke and the middle and later stages of the punch stroke. For the cases where wrinkles occur in different periods, the blanking parameters are adjusted specifically. After adjustment, continue to perform debugging blanking until the wrinkling phenomenon disappears, and determine the appropriate blank holding force of the blank holder, the appropriate speed of the punch, and / or the appropriate hardness of the polyurethane, achieving the targeted adjustment of blanking parameters in different periods, and then being able to quickly determine the appropriate blanking parameters, reducing the consumption of manpower, material resources and time. Brief Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a schematic flow chart of the sensor diaphragm blanking debugging method in an embodiment of the present invention;

[0042] Figure 2 It is a schematic time-stroke curve diagram of the punch and the blank holder in an embodiment of the present invention;

[0043] Figure 3 It is a schematic diagram of the blanking device in an embodiment of the present invention.

[0044] Among them, 1, workbench; 2, polyurethane; 3, sheet material; 4, blank holder; 5, punch. Detailed Embodiments

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0046] The purpose of the present invention is to provide a sensor diaphragm blanking debugging method, which specifically adjusts the blanking parameters in the case of wrinkles appearing in different periods to determine the optimal blanking parameters, achieving the technical effect of quickly determining the appropriate blanking parameters.

[0047] To make the above objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Referring to Figures 1-3 , the sensor diaphragm blanking debugging method disclosed in the embodiments of the present invention includes: First, determine the initial blank holding force P of the blank holder according to the physical properties of the to-be-blanked sheet material; then, determine the initial hardness of the polyurethane; the blank holder presses the to-be-blanked sheet material with the initial blank holding force P, and the punch punches the sheet material at the initial speed k0 to form a diaphragm; if wrinkles exist on the edge of the punched diaphragm, debugging blanking is carried out; the debugging blanking process includes the initial stage of the punch stroke and the middle and late stages of the punch stroke, and the wrinkling situation of the diaphragm is checked respectively in the initial stage of the punch stroke and the middle and late stages of the punch stroke; if the wrinkling of the diaphragm occurs in the initial stage of the punch stroke, it means that the blank holding force provided by the blank holder for the sheet material during blanking is insufficient, and it is necessary to increase the blank holding force provided by the blank holder for the sheet material during blanking. After increasing the blank holding force, re-perform the debugging blanking until the wrinkling phenomenon is eliminated in the initial stage of the punch stroke, and then determine the matching blank holding force of the blank holder; if the wrinkling of the diaphragm occurs in the middle and late stages of the punch stroke, it means that the punching speed of the punch in the middle and late stages of the punch stroke is insufficient and / or the hardness of the polyurethane is insufficient, and it is necessary to increase the speed of the punch in the middle and late stages of the stroke and / or increase the hardness of the polyurethane, and re-perform the debugging blanking until the wrinkling phenomenon is eliminated in the middle and late stages of the punch stroke, and then determine the matching speed of the punch and / or the matching hardness of the polyurethane; when the diaphragm no longer wrinkles, the process is solidified. By adopting the above method, the targeted adjustment of blanking parameters at different times is realized, and then the appropriate blanking parameters can be quickly determined to produce diaphragms with better quality, reducing the consumption of manpower, material resources, and time.

[0049] Preferably, the way to increase the hardness of the polyurethane is to replace the polyurethane cushion block with a greater hardness.

[0050] As a preferred embodiment, the initial blank holding force is determined according to the following formula

[0051] , to determine the initial blank holding force P;

[0052] where t is the thickness of the to-be-blanked sheet material, E is the elastic modulus of the to-be-blanked sheet material, σ is the yield strength of the to-be-blanked sheet material, and a, b, c are the weights of the thickness, elastic modulus, and yield strength respectively, and P max is the maximum blank holding force provided by the blank holder without the sheet material being deformed due to the extrusion of the blank holder. Where a, b, and c are all constants and can be confirmed through experience and a large number of existing test results. After determining the initial blank holding force through the formula, and then adjusting the movement speed of the blank holder, the accurate parameters of the blank holder during final production can be obtained.

[0053] Preferably, the value range of a is 15 to 35, and the preferred value of a is 20; the value range of b is 0.0024 to 0.0048, and the preferred value of b is 0.003; the value range of c is 0.0028 to 0.0036, and the preferred value of c is 0.0032.

[0054] As a preferred embodiment, since the hardness of the polyurethane changes with the environmental temperature and humidity, before blanking, a hardness meter is used to measure the hardness of the polyurethane to determine the initial hardness of the polyurethane, so as to clarify the change in the hardness of the polyurethane under the influence of the environment.

[0055] Preferably, when the position difference between the blank holder and the punch is the same, the greater the hardness of the polyurethane, the greater the forming driving force provided for the sheet metal.

[0056] Preferably, this method for blanking and debugging the sensor diaphragm is mainly used for blanking the sensor diaphragm.

[0057] Example 1:

[0058] As a preferred embodiment, the diaphragm blanking stage includes a diaphragm forming stage and a diaphragm cutting stage. When d2 - d1 ≤ 0.9d, it is the diaphragm forming stage, and when 0.9d < d2 - d1 ≤ d, it is the diaphragm cutting stage; where d is the stroke difference between the punch and the blank holder when the diaphragm blanking is completed, d1 is the stroke of the blank holder, and d2 is the stroke of the punch.

[0059] As a preferred embodiment, d2 - d1 ≤ 0.9d / n is the initial stage of the punch stroke, and the middle and late stages of the punch stroke include the diaphragm cutting stage, where n is a positive integer not less than 4.

[0060] Preferably, during blanking debugging, the diaphragm forming stage is divided into n equal segments. More preferably, n = 4. Among them, the first segment is the initial stage of the punch stroke, and the diaphragm cutting stage is a part of the middle and late stages of the punch stroke; initially set the speed of the blank holder k 11 = k 12 = 0, the speed of the punch k 21 = 0.9k max ,k 22 = k max ,and perform blanking; where k 11 is the moving speed of the blank holder in the diaphragm forming stage, k 12 is the moving speed of the blank holder in the diaphragm cutting stage, k 21 is the moving speed of the punch in the diaphragm forming stage, k 22 is the moving speed of the punch in the diaphragm cutting stage, k max is the maximum speed of the punch allowed by the machine; that is, the initial speed of the punch in the first stage is 0.9k max, the initial velocity of the punch in the second stage is k max .

[0061] If wrinkling of the diaphragm occurs at the initial stage of the punch stroke, increase the blank-holding force provided by the blank-holder for the sheet metal during the blanking process, including:

[0062] Make the blank-holder pressure increase according to the formula Δs = k 11 *t 11 , where k 11 = 0.9k 21 , where Δs is the stroke when the blank-holder increases the pressure, and t 11 is the movement duration of the blank-holder during the diaphragm forming stage in the debugging blanking process; set the initial value of t 11 to be 0.01 * 0.9d / 4 / k 21 . If wrinkling still exists at the initial stage of the punch stroke after increasing the blank-holding force of the blank-holder, then increase t 11 in an increasing trend of 5% - 10% based on the previous value. Each time the blank-holding force is increased, a new diaphragm blanking process is carried out, and observe again whether the diaphragm wrinkles until the wrinkling phenomenon is eliminated at the initial stage of the punch stroke; and solidify the process with the equipment parameters at this time.

[0063] If wrinkling of the diaphragm occurs during the diaphragm cutting stage, increase the speed of the punch in the fourth stage and / or increase the hardness of the polyurethane, and then carry out the diaphragm blanking process again until the wrinkling phenomenon is eliminated during the diaphragm cutting stage; and solidify the process with the equipment parameters at this time. Further, if wrinkling of the diaphragm occurs during the diaphragm cutting stage, first increase the speed of the punch in the fourth stage in an increasing trend of 5% - 10%. If wrinkling still exists when the punch speed increases to k max , then start to increase the hardness of the polyurethane until the wrinkling phenomenon is eliminated during the diaphragm cutting stage.

[0064] Preferably, divide the diaphragm forming stage into n identical segments. To improve the forming quality of the diaphragm, the punch should be stationary for a certain duration ∆t 2i after the end of each stage of movement, where ∆t 2i = 0.1t 2i , and t 2i = 1 / n * (0.9d / k 21 ), where t 2i is the movement duration of the punch in each stage of movement; when the punch is stationary, the diaphragm can release part of the energy generated by deformation, thereby improving the final forming quality of the diaphragm. When n = 4, ∆t 2i = 0.1t 2i , and t 2i = 0.25 * (0.9d / k 21 ).

[0065] As a preferred embodiment, the time-travel curve of the blank holder depends on the starting moment X of each segment of the blank holder's movement 1i , the movement duration t 1i , the movement stationary duration ∆t 1i ; the time-travel curve of the punch depends on the starting moment X of each segment of its movement 2i , the movement duration t 2i , the movement stationary duration ∆t 2i .

[0066] More preferably, in the diaphragm forming stage, d2 - d1 increases monotonically with time, that is, in the diaphragm forming stage, when the punch is stationary, the blank holder is also stationary.

[0067] As a preferred embodiment, when n = 4, in the middle and late stages of the punch stroke, it also includes 0.9d3 / 4 < d2 - d1 ≤ 0.9d.

[0068] As a preferred embodiment, if wrinkling of the diaphragm occurs when 0.9d3 / 4 < d2 - d1 ≤ 0.9d, then increase the speed of the punch in the fourth stage and / or increase the hardness of the polyurethane, and perform the diaphragm blanking process again until the wrinkling phenomenon is eliminated within the range of 0.9d3 / 4 < d2 - d1 ≤ 0.9d; and cure the process with the equipment parameters at this time.

[0069] As a preferred embodiment, increasing the speed of the punch in the fourth stage includes: making k 21 increase in a trend of 5% - 10% when 0.9d3 / 4 < d2 - d1 ≤ 0.9d for the punch, and for each increase of k 21 , perform blanking once and observe again whether the diaphragm wrinkles until the wrinkling phenomenon is eliminated in the middle and late stages of the punch stroke; and cure the process with the equipment parameters at this time.

[0070] As a preferred embodiment, the following operations need to be performed before curing the process: in the case of no wrinkling of the diaphragm, check the blanking corrugation quality s and h, where s is the warpage degree and h is the forming wave height; if s is greater than 100 μm and / or h does not reach 95% of the design requirements, then make the initially set k 21 decrease in a trend of 5% - 10%, or increase n to reduce the forming speed so that the energy generated during the blanking process can be released until s is less than or equal to 100 μm and h reaches 95% of the design requirements; if s is less than or equal to 100 μm and h reaches 95% of the design requirements, then no adjustment is required. Whether it is to reduce the value of k 21 or increase n, it will increase the total blanking duration. When both methods can meet the forming quality, the method with a shorter total debugging duration is preferred.

[0071] Preferably, n ≤ 8.

[0072] Those skilled in the art can understand that the design requirements are not fixed values and can be adaptively adjusted according to actual production needs. For example, products with high forming quality requirements have higher design requirements, while products with low forming quality requirements have lower design requirements.

[0073] Preferably, the value of k 21 is at least not less than 0.6k max .

[0074] As a preferred embodiment, if reducing k 21 or increasing the value of n cannot meet the requirements, increase the moving speed of the blank holder in the stage of d2 - d1 = 0.4d - 0.6d. Specifically, the initial set speed of the blank holder is 0.05 times the punch speed, and the speed of the blank holder gradually increases with an increasing trend of 5%.

[0075] Preferably, in the stage of d2 - d1 = 0.4d - 0.6d, the moving speed of the blank holder is not greater than the moving speed of the punch.

[0076] Debugging in the manner of this embodiment has higher debugging accuracy, and thus can produce diaphragms with better blanking quality, which is suitable for production processes with higher requirements for diaphragm forming quality.

[0077] Embodiment 2:

[0078] As a preferred embodiment, when d2 - d1 ≤ 0.9d, it is the diaphragm forming stage, and when 0.9d < d2 - d1 ≤ d, it is the diaphragm cutting stage; where d is the stroke difference between the punch and the blank holder when the diaphragm blanking is completed, d1 is the stroke of the blank holder, and d2 is the stroke of the punch.

[0079] Preferably, when d2 - d1 ≤ 0.2d, it is the initial stage of the punch stroke, and when d2 - d1 > 0.7d, it is the middle and late stages of the punch stroke.

[0080] As a preferred embodiment, when debugging blanking, initially set the moving speed of the blank holder k 11 = k 12 = 0, and the moving speed of the punch k 21 = k 22 = k max ; and perform blanking. During this process, the punch always remains in a moving state; where k 11 is the moving speed of the blank holder in the diaphragm forming stage, k 12 is the moving speed of the blank holder in the diaphragm cutting stage, k 21 is the moving speed of the punch in the diaphragm forming stage, k 22 is the moving speed of the punch in the diaphragm cutting stage, k maxThe maximum speed of the punch allowed by the machine; that is, the initial speeds of the punch in the first stage and the second stage are both k max .

[0081] If wrinkling of the diaphragm occurs at the initial stage of the punch stroke, increasing the blank holding force of the blank holder includes: making the blank holder pressure increase according to the formula Δs = k 11 *t 11 , where Δs is the stroke when the blank holder increases the pressure, k 11 = 0.9k 21 , t 11 is the movement duration of the blank holder in the diaphragm forming stage during the debugging of the blanking process, and the initial value of t 11 is 0.01d / k max . If wrinkling still exists at the initial stage of the punch stroke after increasing the blank holding force of the blank holder, then the previous t 11 will increase in a trend of 5% - 10% until wrinkling at the initial stage of the punch stroke is eliminated; and the process will be solidified with the equipment parameters at this time.

[0082] Furthermore, during the process of increasing the blank holding force of the blank holder, t 11 ≤ 0.2d / (k 21 - k 11 ), and at this time, T2 = (t 11 × k 11 + 0.2d) / k 21 , where T2 is the total duration when the punch speed is not zero during this process; if t 11 reaches the upper limit and still wrinkles, then the value of k 11 will increase in a trend of 5% on the basis of the previous time, but it is necessary to ensure that k 11 is always less than k 21 . Repeat the above process until wrinkling at the initial stage of the punch stroke is eliminated, and the process will be solidified with the equipment parameters at this time.

[0083] Preferably, if wrinkling of the diaphragm occurs in the middle and late stages of the punch stroke, increase the hardness of the polyurethane, and perform the diaphragm blanking process again until wrinkling is eliminated; and the process will be solidified with the polyurethane hardness at this time.

[0084] As a preferred implementation manner, the equipment parameters include the movement speeds and movement durations of the punch and the polyurethane in each stage, as well as the initial blank holding force P of the blank holder and the hardness of the polyurethane.

[0085] The debugging method in this embodiment is more convenient, can quickly determine the blanking parameters suitable for diaphragm blanking, so as to quickly carry out the production and processing of the diaphragm, and is applicable to the production process with relatively low requirements for the forming quality of the diaphragm.

[0086] Example Three:

[0087] As a preferred embodiment, a blanking device for the sensor diaphragm blanking debugging method includes a punch 5, a blank holder 4, and a polyurethane 2; the polyurethane 2 is installed on a workbench 1, the punch 5 and the blank holder 4 are both arranged above the polyurethane 2, a working hole for the punch 5 to pass through is formed in the middle of the blank holder 4, the punch 5 and the blank holder 4 are respectively connected to two driving devices and can move up and down above the polyurethane 2, and a blanking station for placing a sheet material 3 is arranged between the blank holder 4 and the polyurethane 2.

[0088] Adaptations made according to actual requirements are within the protection scope of the present invention.

[0089] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A blanking debugging method for a sensor diaphragm, characterized in that Including: Step S1: Determine the initial blank-holding force P of the blank-holder according to the physical properties of the blank to be blanked. Step S2: Determine the initial hardness of the polyurethane. Step S3: The blank-holder compresses the blank to be blanked with the initial blank-holding force, and the punch punches the blank at an initial speed k0 to form a diaphragm. If wrinkles appear at the edge of the diaphragm, go to Step S4. Step S4: Debug the blanking. The debugging process includes the initial stage of the punch stroke and the middle and late stages of the punch stroke. Check the wrinkling condition of the diaphragm respectively in the initial stage of the punch stroke and the middle and late stages of the punch stroke. If the wrinkling of the diaphragm occurs in the initial stage of the punch stroke, after increasing the blank-holding force of the blank-holder, re-perform the debugging blanking until the wrinkling phenomenon is eliminated in the initial stage of the punch stroke, and determine the suitable blank-holding force of the blank-holder. If the wrinkling of the diaphragm occurs in the middle and late stages of the punch stroke, adjust the speed of the punch and / or re-perform the debugging blanking after increasing the hardness of the polyurethane until the wrinkling phenomenon is eliminated in the middle and late stages of the punch stroke, and determine the suitable speed of the punch and / or the suitable hardness of the polyurethane. Step S5: Cure the process. When d2 - d1 ≤ 0.9d, it is the diaphragm forming stage; when 0.9d < d2 - d1 ≤ d, it is the diaphragm cutting stage. Wherein, d is the stroke difference between the punch and the blank-holder when the diaphragm blanking is completed, d1 is the stroke of the blank-holder, d2 is the stroke of the punch. In Step S4: When d2 - d1 ≤ 0.9d / n, it is the initial stage of the punch stroke. The middle and late stages of the punch stroke include the diaphragm cutting stage, where n is a positive integer not less than 4. In Step S4: Preliminarily set the blank holder k 11 =k 12 =0, punch k 21 =0.9k max , k 22 =k max , n = 4; and perform blanking, where k 11 is the movement speed of the blank holder in the diaphragm forming stage, k 12 is the movement speed of the blank holder in the diaphragm cutting stage, k 21 is the movement speed of the punch in the diaphragm forming stage, k 22 is the movement speed of the punch in the diaphragm cutting stage; If the wrinkling of the diaphragm occurs in the initial stage of the punch stroke, increasing the blank-holding force of the blank-holder includes: Make the blank holder pressure increase according to the formula Δs = k 11 *t 11 , where Δs is the stroke when the blank holder pressure increases, and k 11 = 0.9k 21 , t 11 is the movement duration of the blank holder in the diaphragm forming stage, and the initial value of t 11 is 0.01 * 0.9d / n / k 21 . If wrinkling still occurs at the initial stage of the punch stroke after increasing the blank holding force of the blank holder, then increase the previous t 11 in a trend of 5% - 10% until the wrinkling phenomenon is eliminated at the initial stage of the punch stroke.

2. The sensor diaphragm blanking debugging method according to claim 1, wherein In Step S1, determining the initial blank-holding force P of the blank-holder includes: According to the formula: , 15 ≤ a ≤ 35; 0.0024 ≤ b ≤ 0.0048; 0.0028 ≤ c ≤ 0.0036; Determine the initial blank holding force P; where t is the thickness of the blank to be blanked, E is the elastic modulus of the blank to be blanked, σ is the yield strength of the blank to be blanked, and a, b, and c are the weights of the thickness, elastic modulus, and yield strength respectively, and P max is the maximum blank holding force provided by the blank holder when the blank does not deform due to the extrusion of the blank holder.

3. The sensor diaphragm blanking debugging method according to claim 1, wherein When n = 4, the middle and late stages of the punch stroke also include 0.9d×3 / 4 < d2 - d1 ≤ 0.9d.

4. The sensor diaphragm blanking debugging method according to claim 3, characterized in that, Adjusting the speed of the punch includes: making k of the punch increase in a trend of 5%-10% when 0.9d3 / 4 < d2 - d1 ≤ 0.9d, until the wrinkling phenomenon is eliminated in the middle and late stages of the punch stroke. 21 until the wrinkling phenomenon is eliminated in the middle and late stages of the punch stroke.

5. The sensor diaphragm blanking debugging method according to claim 1, characterized in that, Divide the diaphragm forming stage into n identical segments, and the punch should remain stationary for ∆t after the movement in any segment ends. 2i , ∆t 2i = 0.1t 2i , t 2i = 1 / n * (0.9d / k 21 ), where t 2i is the movement duration of the punch in each segment.

6. The sensor diaphragm blanking debugging method according to claim 5, wherein Before Step S5, it also includes: In the case where the diaphragm does not wrinkle, check the blanking corrugation quality s and h, where s is the warpage degree and h is the forming wave height. If s is greater than 100 μm and / or h does not reach 95% of the design requirement, then the initially set k 21 will be decreased in a trend of 5% - 10%, or n will be increased until s is less than or equal to 100 μm and h reaches 95% of the design requirement; If s is less than or equal to 100 μm and h reaches 95% of the design requirement, no adjustment is required.

7. The sensor diaphragm blanking debugging method according to claim 1, characterized in that When d2 - d1 ≤ 0.9d, it is the diaphragm forming stage; when 0.9d < d2 - d1 ≤ d, it is the diaphragm cutting stage. Wherein, d is the stroke difference between the punch and the blank-holder when the diaphragm blanking is completed, d1 is the stroke of the blank-holder, d2 is the stroke of the punch. In Step S4: When d2 - d1 ≤ 0.2d, it is the initial stage of the punch stroke; when d2 - d1 > 0.7d, it is the middle and late stages of the punch stroke.

8. The sensor diaphragm blanking debugging method according to claim 7, wherein In Step S4: Preliminarily set the blank holder k 11 = k 12 = 0, the punch k 21 = k 22 = k max ; and perform blanking, where k 11 is the movement speed of the blank holder in the diaphragm forming stage, k 12 is the movement speed of the blank holder in the diaphragm cutting stage, k 21 is the movement speed of the punch in the diaphragm forming stage, k 22 is the movement speed of the punch in the diaphragm cutting stage; If the wrinkling of the diaphragm occurs at the initial stage of the punch stroke, increasing the blank holding force of the blank holder includes: making the blank holder pressure increase according to the formula Δs = k 11 *t 11 , where Δs is the stroke when the blank holder increases the pressure, and k 11 = 0.9k 21 , t 11 is the movement duration of the blank holder in the diaphragm forming stage, and the initial value of t 11 is 0.01d / k max . If wrinkling still exists at the initial stage of the punch stroke after increasing the blank holding force of the blank holder, then increase the previous t 11 in a trend of 5% - 10% until the wrinkling phenomenon is eliminated at the initial stage of the punch stroke.

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