Method for determining the compensation of the closing die height of a press

Abstract

The present application provides a kind of press closed mould height compensation quantity determination method, the method comprises: determining the first function between the maximum deformation of slider and slider width;Determine the second function between the maximum deformation of workbench and workbench width;At nominal pressure, measure the first deformation of slider, measure the first deformation of workbench and measure the deformation of support;According to nominal pressure and compensation quantity, determine the target compensation quantity at any pressure.The method is based on the typical structure parameters of press, first, by measuring the deformation of each part at nominal pressure, the function relationship between each deformation and equipment parameters and the compensation quantity at nominal pressure are calculated, and the compensation quantity at any pressure is calculated according to the compensation quantity at nominal pressure, and the production accuracy of mould is improved by setting the closed mould height compensation quantity.

Description

Technical Field

[0001] This invention relates to the field of press control technology, and more specifically to a method for determining the compensation amount of the closed die height of a press. Background Technology

[0002] During the operation of a press, it is always desirable for the displacement sensor to accurately detect and control the displacement of the slide block, thereby controlling the mold closing state and meeting the molding accuracy requirements.

[0003] However, in actual work, the deformation of components such as the press slide, worktable, and support often causes a difference between the initial mold closing height parameter set in the program and the actual operating parameters of the slide, resulting in low mold production accuracy. Summary of the Invention

[0004] This invention provides a method for determining the compensation amount of the closed die height of a press, which solves the problem of low die production accuracy in the prior art.

[0005] This invention provides a method for determining the compensation amount of the closed mold height of a press. The press includes a slider, a worktable, and a support column. The slider moves up and down relative to the support column. The mold is located between the worktable and the slider. The mold includes an upper mold and a lower mold.

[0006] The method for determining the compensation amount includes the following steps:

[0007] Under the same working condition, the first function relating the maximum deformation 'a' of the slider to the width 'X' of the slider is:

[0008] a = K1 × (X / 2) 3

[0009] The second function relating the maximum deformation b of the worktable to the width Y of the worktable:

[0010] b = K² × (Y / 2) 3

[0011] Wherein, K1 is the first influence coefficient, K2 is the second influence coefficient; the maximum deformation a of the slider is the vertical distance from the bottom end of the slider side to the center position of the slider; the maximum deformation b of the worktable is the vertical distance from the top end of the worktable side to the center position of the worktable;

[0012] Under nominal pressure F0, the first deformation a0 of the slider, the first deformation b0 of the worktable, and the deformation g0 of the support column are measured.

[0013] The value of the first influence coefficient is determined based on the first deformation a0 of the slider, the width X of the slider, and the first function; the value of the second influence coefficient is determined based on the first deformation b0 of the worktable, the width Y of the worktable, and the second function.

[0014] Based on the first function, the value of the first influence coefficient, and the mold width B, the second deformation d of the slider is determined; the second deformation d of the slider is the vertical distance from the top surface of the upper mold to the center position of the slider; based on the second function, the value of the second influence coefficient, and the mold width B, the second deformation f of the worktable is determined; the second deformation f of the worktable is the vertical distance from the bottom surface of the lower mold to the center position of the worktable.

[0015] Based on the second deformation d of the slider and the first deformation a0 of the slider, the third deformation c of the slider is determined; the third deformation c of the slider is the vertical distance from the bottom end of the side of the slider to the top surface of the upper mold; based on the second deformation f of the worktable and the first deformation b0 of the worktable, the third deformation e of the worktable is determined; the third deformation e of the worktable is the vertical distance from the top end of the side of the worktable to the bottom surface of the lower mold;

[0016] The sum of the third deformation c of the slider, the third deformation e of the worktable, and the deformation g0 of the support column is the compensation amount n0 under the nominal pressure F0:

[0017] n0 = c + e + g0

[0018] Based on the nominal pressure F0 and the compensation amount n0, determine the target compensation amount n under any pressure F:

[0019] n = F / F0 × n0

[0020] Optionally, after determining the target compensation amount n under any pressure F, the following steps are also included:

[0021] The target closed mold height is determined based on the initially set closed mold height and the target compensation amount n in the program. The target closed mold height is the sum of the initially set closed mold height and the target compensation amount n.

[0022] Optionally, measuring the first deformation a0 of the slider includes the following steps:

[0023] A first bracket is horizontally mounted on the top surface of the workbench, and a first dial indicator and a second dial indicator are mounted on the top surface of the bracket; the pointers of the first dial indicator and the second dial indicator point vertically to the bottom side and center position of the slider, respectively.

[0024] When the press is not pressurized, both the first dial indicator and the second dial indicator are adjusted to zero.

[0025] After the pressure of the press reaches the nominal pressure F0, the first difference between the first dial indicator and the second dial indicator is calculated; the first difference is the first deformation a0 of the slider.

[0026] Optionally, measuring the first deformation b0 of the worktable includes the following steps:

[0027] A second bracket is horizontally mounted on the bottom surface of the slider, and a third and fourth dial indicator are mounted on the bottom surface of the second bracket; the pointers of the third and fourth dial indicators point vertically to the top and center positions of the side of the worktable, respectively.

[0028] When the press is not pressurized, both the third and fourth dial indicators are adjusted to zero.

[0029] After the pressure of the press reaches the nominal pressure F0, the second difference between the third and fourth dial indicators is calculated; the second difference is the deformation b0 of the first worktable.

[0030] Optionally, measuring the pillar deformation g0 includes:

[0031] A third bracket is vertically installed at the top side of the workbench, and a fifth dial indicator is installed on the top surface of the third bracket; the pointer of the fifth dial indicator points vertically to the bottom surface of the upper crossbeam of the press.

[0032] When the press is not pressurized, adjust the pointer of the fifth dial indicator to zero;

[0033] After the pressure of the press reaches the nominal pressure F0, the value of the fifth dial gauge is read, and the value is the column deformation g0.

[0034] The embodiments of the present invention have at least the following beneficial effects:

[0035] During press operation, a discrepancy often arises between the initially set closed die height and the actual closed die height. This difference is primarily due to the deformation of the slider, worktable, and support column. To address this issue, the applicant derived and verified in practice that the planar deformation profiles of the slider and worktable in contact with the die after pressing are curve functions with influence coefficients. Then, under nominal pressure, the deformation values ​​of the slider, worktable, and support column were measured, and the influence coefficients in each curve function were determined based on the measured deformation values ​​of the slider and worktable under nominal pressure. Finally, based on the relative relationships between the deformation positions of the slider and worktable, and the deformation of the support column, the difference under nominal pressure was calculated, i.e., the compensation amount for the initially set closed die height. Finally, based on the functional relationship between the compensation amount under arbitrary pressure and the compensation amount under nominal pressure, derived and verified in practice, the compensation amount under arbitrary working pressure was determined. This method calculates the compensation amount under arbitrary pressure based on the typical structural parameters of the press, improving the die production accuracy by setting a closed die height compensation amount. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A flowchart illustrating the method for determining the compensation amount of the closed die height of a press provided in an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the press when it is not pressurized is provided in an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the structure of the press after pressing according to an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of slider deformation measurement provided in an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of workbench deformation measurement provided in an embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram of pillar deformation measurement provided for an embodiment of the present invention.

[0043] Figure label:

[0044] 1-Slider; 2-Workbench; 3-Support column; 4-Mold; 4-1-Upper mold; 4-2-Lower mold; 5-Tie rod; 6-Hydraulic cylinder; 7-Upper crossbeam; 8-Lower crossbeam; 9-Sensor; 9-1-Sensor body; 9-2-Sensor slider; 10-First support; 11-First dial indicator; 12-Second dial indicator; 13-Second support; 14-Third dial indicator; 15-Fourth dial indicator; 16-Third support; 17-Fifth dial indicator. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] like Figure 2 As shown, the press includes a slider 1, a worktable 2, and a support column 3. The slider 1 moves up and down relative to the support column 3. The mold 4 is located between the worktable 2 and the slider 1. The mold 4 includes an upper mold 4-1 and a lower mold 4-2. Figure 1 As shown, the method includes the following steps:

[0047] Step 101: Under the same working state, the first function relating the maximum deformation 'a' of the slider to the width 'X' of the slider is:

[0048] a = K1 × (X / 2) 3

[0049] The second function relating the maximum deformation b of the worktable to the width Y of the worktable:

[0050] b = K² × (Y / 2) 3

[0051] Wherein, K1 is the first influence coefficient, K2 is the second influence coefficient; the maximum deformation a of the slider is the vertical distance from the bottom end of the slider side to the maximum deformation position of the slider; the maximum deformation b of the worktable is the vertical distance from the top end of the worktable side to the maximum deformation position of the worktable.

[0052] Specifically, such as Figure 2 As shown, the press equipment structure includes a tie rod 5, a hydraulic cylinder 6, an upper crossbeam 7, and a lower crossbeam 8. The mold 4 is set on the worktable and located between the slider 1 and the worktable 2, generally centered to ensure uniform force distribution. The slider 1 can move relative to the support column 3 under the action of the hydraulic cylinder 6. Figure 2As shown, when not pressed, the worktable 2, slider 1, and support 3 do not deform. At this time, the distance h between the bottom end of the side of slider 1 and the top end of the side of worktable 2 is the same as the height H of mold 4. Furthermore, without pressing mold 4, the required production precision cannot be achieved. When the press presses mold 4, as... Figure 3 As shown, slider 1 and worktable 2 are deformed to some extent. Due to this deformation, there will be a deviation between the initially set closed mold height dimension in the program and the actual closed mold height dimension. Specifically, the distance between the bottom end of the side of slider 1 and the top end of the side of worktable 2 is h0, where h0 is less than H. This deviation is mainly caused by the deformation of slider 1, worktable 2, and support column 3. Figure 2 As shown, when the initial closed mold height is set to H in the program, due to the deformation of slider 1, worktable 2, and support column 3, the actual downward movement of slider 1 is insufficient to generate enough pressure on mold 4, failing to meet production accuracy requirements. To compensate for program control errors, a compensation amount needs to be set in the program during operation so that the actual downward movement of slider 1 can achieve the effect of pressing mold 4 upwards. Figure 3 As shown, this is to achieve the target control accuracy.

[0053] Since the mold 4 has good rigidity relative to the slider 1, the worktable 2 and the support column 3, it has little impact on deviation detection. Therefore, in this invention, the mold 4 is considered as a rigid body, that is, in the working state of the press, only the deformation of the slider 1, the worktable 2 and the support column 3 is considered.

[0054] When in operation, support column 3 will extend, as... Figure 3 As shown, the deformation of support 3 is g, and the side of slider 1 will deform downward. The maximum deformation a of the bottom surface of slider 1 is the vertical distance from the bottom end of the side of slider 1 to the center of the bottom surface of slider 1. In the working state, the middle of the top surface of worktable 2 tends to bend downward. The maximum deformation b of worktable 2 is the vertical distance from the top end of the side of worktable 2 to the center of the top surface of worktable 2.

[0055] The applicant derived and verified in practice that the deformation profile of the bottom surface of slider 1 and the width X of slider 1 have an approximate cubic curve relationship, and the deformation profile of the top surface of worktable 2 and the width Y of worktable 2 also have an approximate cubic curve relationship. Therefore, the first function determining the relationship between the maximum deformation 'a' of slider 1 and the width X of slider 1 is:

[0056] a = K1 × (X / 2) 3 (1)

[0057] Determine the second function relating the maximum deformation b of worktable 2 to the width Y of worktable 2:

[0058] b = K² × (Y / 2) 3 (2)

[0059] In formulas (1) and (2), K1 is the first influence coefficient and K2 is the second influence coefficient.

[0060] Step 102: Under nominal pressure F0, measure the first deformation a0 of the slider, the first deformation b0 of the worktable, and the deformation g0 of the support column.

[0061] Specifically, after determining the first function relating the maximum deformation 'a' of slider 1 to the width 'X' of slider 1 and the second function relating the maximum deformation 'b' of worktable 2 to the width 'Y' of worktable 2, the working pressure of the press is set to the nominal pressure F0. The nominal pressure is the maximum permissible working pressure of slider 1 of the press.

[0062] Under nominal pressure, measure the vertical distance from the bottom end of the side of slider 1 to the center of the bottom surface of slider 1, i.e., the first deformation a0 of slider. Also, measure the vertical distance from the top end of the side of worktable 2 to the center of the top surface of worktable 2 under nominal pressure, i.e., the first deformation b0 of worktable. Finally, measure the deformation g0 of the support column.

[0063] Step 103: Determine the value of the first influence coefficient based on the first deformation a0 of the slider, the slider width X, and the first function; determine the value of the second influence coefficient based on the first deformation b0 of the worktable, the worktable width Y, and the second function.

[0064] Specifically, in the equipment parameters of the press, the width dimension X of the slider 1 is known.

[0065] Based on the first deformation a0 of the slider measured under the nominal pressure F0, and according to the slider width X and formula (1), the value of the first influence coefficient K1 can be calculated:

[0066] K1 = a0 / (X / 2) 3 (3)

[0067] Under the nominal pressure F0, the maximum deformation b0 of the worktable 2 is measured, and the value of the second influence coefficient K2 can be calculated according to the worktable width Y and formula (2):

[0068] K2 = b0 / (Y / 2) 3 (4)

[0069] Step 104: Determine the second deformation d of the slider based on the first function, the value of the first influence coefficient, and the mold width B; the second deformation d of the slider is the vertical distance from the top surface of the upper mold to the center position of the slider; determine the second deformation f of the worktable based on the second function, the value of the second influence coefficient, and the mold width B; the second deformation f of the worktable is the vertical distance from the bottom surface of the lower mold to the center position of the worktable.

[0070] Specifically, such as Figure 3 As shown, the second deformation d of the slider is the vertical distance from the top surface of the upper die to the center of the bottom surface of the slider. The second deformation d of the slider can be considered as the deformation when the slider width is B, which can be obtained from the first function:

[0071] d = K1 × (X / 2) 3 (5)

[0072] The value of K1 has already been obtained under the nominal pressure, i.e., formula (3). Assigning the value of formula (3) to K1 in formula (5), and substituting X with the value of B into formula (5), we obtain the second deformation d of the slider as:

[0073] d = a0 / (X / 2) 3 ×(B / 2) 3 (6)

[0074] Similarly, the second deformation variable f of the worktable is the vertical distance from the bottom surface of the lower mold 4-2 of the mold 4 to the center of the top surface of the worktable. The second deformation variable f of the worktable can be seen as the vertical distance from the bottom surface of the lower mold 4 to the center of the top surface of the worktable when the width of the worktable is the same as the width B of the mold. According to the second function, we can obtain:

[0075] f = K² × (B / 2) 3 (7)

[0076] The value of K2 has already been obtained under the nominal pressure, i.e., formula (4). Assigning the value of formula (4) to K2 in formula (7), and substituting Y as B into formula (7), we obtain the second deformation f of the workbench as:

[0077] f = b0 / (Y / 2) 3 ×(B / 2) 3 (8)

[0078] Step 105: Determine the third deformation c of the slider based on the second deformation d of the slider and the first deformation a0 of the slider; the third deformation c of the slider is the vertical distance from the bottom end of the slider side to the top surface of the upper mold; determine the third deformation e of the worktable based on the second deformation f of the worktable and the first deformation b0 of the worktable; the third deformation e of the worktable is the vertical distance from the top end of the worktable side to the bottom surface of the lower mold.

[0079] Specifically, such as Figure 3 As shown, the third deformation c of the slider is the vertical distance from the bottom surface of the side of slider 1 to the top surface of the upper mold 4-1. According to... Figure 3 The positional relationship between the second deformation d, the first deformation a, and the third deformation c of the slider in the figure, and based on the measured first deformation a0, the third deformation c of the slider under nominal pressure can be obtained:

[0080] c = a0 - d (9)

[0081] Similarly, such as Figure 3 As shown, the third deformation 'e' of the worktable is the vertical distance from the top surface of the worktable side to the bottom surface of the lower mold 4-2. According to... Figure 3 The positional relationship between the second deformation f, the first deformation b0, and the third deformation e of the worktable in the figure, and based on the measured first deformation b0, the third deformation e of the worktable under nominal pressure can be obtained:

[0082] e = b0 - f (10)

[0083] Step 106: The sum of the third deformation c of the slider, the third deformation e of the worktable, and the deformation g0 of the support column is the compensation amount n0 under the nominal pressure F0:

[0084] n0 = c + e + g0

[0085] Specifically, the displacement detection on slider 1 uses a magnetostrictive linear displacement sensor 9. The sensor body 9-1 is mounted on the support of the press, and the sensor slide head 9-2 is mounted on the side of slider 1. When slider 1 moves, it causes relative movement between the sensor slide head 9-2 and the sensor body 9-1, and the displacement sensor 9 can detect the displacement value of slider 1 relative to the support.

[0086] Combination Figure 1 and Figure 3 As can be seen, in actual production, because the sensor body 9-1 is mounted on the support column 3, with the lower end face of the support column 3 as the relative reference, when the support column 3 extends, the sensor body 9-1 moves upward, resulting in a larger detection value. The upward distance of the sensor body 9-1 is as follows: Figure 3As shown, the difference corresponds to the pillar deformation variable g.

[0087] Since the sensor slider part 9-2 is installed on the side of the slider 1, when the slider 1 deforms, the middle part of the slider 1 will not be relatively displaced due to the support of the mold 4. The side of the slider 1 will deform downward, causing the sensor slider part 9-2 to move downward, which will result in a larger detection value. The difference corresponds to the third deformation c of the slider.

[0088] The middle part of the worktable 2 will tend to bend downwards. The mold 4 and the slider 1 will move down with the worktable 2 as a whole, which will also cause the sensor slider part 9-2 to move down, resulting in a larger detection value. The difference corresponds to the third deformation e of the worktable.

[0089] Therefore, the total displacement detection value is excessively large, which is the sum of the support deformation g, the slider's third deformation c, and the worktable's third deformation e. Thus, after setting the mold 4 closing height value, the actual displacement detection values ​​of slider 1, worktable 2, and support 3 are all excessively large, meaning the actual mold 4 closing height is less than the displacement value fed back by the sensor. After the sensor feeds back the excessively large detection value to the program, the program determines this excessively large detection value as the mold's closing height. This causes the program to control slider 1 to move downwards a distance that is insufficient to press the mold 4 upwards, thereby reducing production accuracy.

[0090] In summary, during press operation, the sum of the third deformation c of the slider, the third deformation e of the worktable, and the deformation g0 of the support column is the compensation amount for the closed die height parameter set in the program. Therefore, based on the third deformation c of the slider, the third deformation e of the worktable, and the deformation g0 of the support column, the compensation amount n0 for the closed die height parameter set in the program under nominal pressure can be obtained as follows:

[0091] n0 = c + e + g0 (11)

[0092] Therefore, when producing molds under nominal pressure, a compensation amount n0 needs to be added to the parameter of the closed mold height so that the actual distance that the slider 1 moves downward can press the mold 4 upward, thereby achieving the production accuracy requirements.

[0093] Step 107: Determine the target compensation amount n under any pressure F based on the nominal pressure F0 and the compensation amount n0:

[0094] n = F / F0 × n0

[0095] Specifically, the applicant's research found that during operation, all components of the press undergo elastic deformation. For different working pressures F, the deformation of the slider 1, worktable 2, and support 3 is linearly proportional to the working pressure F. Therefore, their compensation amount is also linearly proportional, that is, the compensation amount n under any working pressure F is:

[0096] n=F / F0×n0 (12)

[0097] In summary, during press operation, a discrepancy often arises between the initially set closed die height and the actual closed die height. This difference is primarily due to the deformation of the slider, worktable, and support column. To address this issue, the applicant, through practical experience, derived and verified that the planar deformation profiles of the slider and worktable in contact with the die after pressing are respectively curve functions with influence coefficients. Then, under nominal pressure, the deformation values ​​of the slider, worktable, and support column were measured, and the influence coefficients in the curve functions were determined based on the measured deformation values ​​of the slider and worktable under nominal pressure. Finally, based on the relative relationships between the deformation positions of the slider and worktable, and the deformation of the support column, the difference under nominal pressure was calculated, i.e., the compensation amount for the initially set closed die height. Finally, based on the functional relationship between the compensation amount under arbitrary pressure and the compensation amount under nominal pressure, derived and verified in practice, the compensation amount under arbitrary working pressure was determined. This method calculates the compensation amount under arbitrary pressure based on the typical structural parameters of the press, improving the die production accuracy by setting a closed die height compensation amount.

[0098] In one possible implementation, after determining the target compensation amount n under any pressure F, the following steps are further included:

[0099] The target closed mold height is determined based on the initially set closed mold height and the target compensation amount n in the program. The target closed mold height is the sum of the initially set closed mold height and the target compensation amount n.

[0100] Specifically, in production, when the target mold closing height dimension of mold 4 reaches H, production accuracy can be achieved. In actual production, when the initial mold closing height dimension set in the program is m0 = H, slider 1 can only move to... Figure 2 At the position shown, the parts of the press have not yet undergone elastic deformation and cannot exert force, meaning that pressing production cannot be achieved.

[0101] Only when slider 1 moves to... Figure 3 The position, i.e., slider 1, needs to be moved further downwards to cause elastic deformation of the various parts of the press, in order to achieve the upward pressing of mold 4 for production. Therefore, the initial mold closing height dimension m0 set in the program needs to be compensated, and the compensation amount is determined by comparison. Figure 2 and Figure 3 It can be seen that the compensation amount is caused by the deformation of slider 1, worktable 2, and support column 3, and its compensation amount is n. Since the compensation amount n has been calculated previously, under a specific pressure, the final mold closing height m set in the program is:

[0102] m = m0 + n (13)

[0103] In one possible implementation, measuring the first deformation a0 of the slider includes:

[0104] The determination of the first deformation a0 of the slider includes the following steps:

[0105] A first bracket is horizontally mounted on the top surface of the workbench, and a first dial indicator and a second dial indicator are mounted on the top surface of the bracket; the pointers of the first dial indicator and the second dial indicator point vertically to the bottom side and center position of the slider, respectively.

[0106] When the press is not pressurized, both the first dial indicator and the second dial indicator are adjusted to zero.

[0107] After the pressure of the press reaches the nominal pressure F0, the first difference between the first dial indicator and the second dial indicator is calculated; the first difference is the first deformation a0 of the slider. Specifically, as follows... Figure 4 As shown, a first support 10 is installed on the workbench 2, parallel to the workbench 2. A first dial indicator 11 and a second dial indicator 12 are placed on the top surface of the first support 10. The pointer of the first dial indicator 11 points vertically to the bottom side of the slider 1, and the pointer of the second dial indicator 12 points vertically to the center of the slider 1. Installing the first support 10 on the workbench 2 can prevent the deformation of the workbench 2 from affecting the measurement of the deformation of the slider 1. When the press is not pressurized, both the first dial indicator 11 and the second dial indicator 12 are adjusted to zero. When the press is pressed to the nominal pressure F0, the difference in readings between the two dial indicators is the slider deformation a0 at the time of measurement.

[0108] In one possible implementation, measuring the first deformation b0 of the worktable includes the following steps:

[0109] A second bracket is horizontally mounted on the bottom surface of the slider, and a third and fourth dial indicator are mounted on the bottom surface of the second bracket; the pointers of the third and fourth dial indicators point vertically to the top and center positions of the side of the worktable, respectively.

[0110] When the press is not pressurized, both the third and fourth dial indicators are adjusted to zero.

[0111] After the pressure of the press reaches the nominal pressure F0, the second difference between the third and fourth dial indicators is calculated; the second difference is the deformation b0 of the first worktable. Specifically, as follows... Figure 5As shown, a second bracket 13 is horizontally mounted on the bottom surface of slider 1, and then a third dial indicator 14 and a fourth dial indicator 15 are mounted on the bottom surface of the second bracket 13. The pointer of the third dial indicator 14 is vertically pointed to the center of the top surface of the worktable 2, and the pointer of the fourth dial indicator 15 is vertically pointed to the top of the side of the worktable 2. Horizontally mounting the second bracket 13 on the bottom surface of slider 1 prevents deformation of slider 1 from affecting the measurement of deformation of the worktable 2. When the press is not pressurized, the third dial indicator 14 and the fourth dial indicator 15 are adjusted to zero. When the press is pressed to the nominal pressure F0, the difference in readings between the two dial indicators is the first deformation b0 of the worktable.

[0112] In one possible implementation, determining the pillar deformation g0 includes the following steps:

[0113] A third bracket is vertically installed at the top side of the workbench, and a fifth dial indicator is installed on the top surface of the third bracket; the pointer of the fifth dial indicator points vertically to the bottom surface of the upper crossbeam of the press.

[0114] When the press is not pressurized, adjust the pointer of the fifth dial indicator to zero;

[0115] After the pressure of the press reaches the nominal pressure F0, the value of the fifth dial gauge is read, and the value is the column deformation g0.

[0116] Specifically, such as Figure 6 As shown, a third support 16 is vertically installed at the top of the side of the workbench, and a fifth dial indicator 17 is vertically installed on the top surface of the third support 16. The pointer of the fifth dial indicator 17 points vertically to the bottom surface of the upper crossbeam 7 to avoid the deformation of the slider 1 and the workbench 2 affecting the measurement of the deformation of the support column 3. When the press is not pressurized, the fifth dial indicator 17 is adjusted to zero. When the press is pressurized to the nominal pressure F0, the reading of the fifth dial indicator 17 is the deformation g0 of the support column at the time of measurement.

[0117] The present invention will be further illustrated by the following embodiments:

[0118] Taking a certain type of press as an example, the nominal pressure of the press is F0 = 12000kN. The width of slide 1 is equal to the width of worktable 2, i.e., X = Y = 3600mm. The width of mold 4 is B = 2000mm, and the height of mold 4 is H = 1200mm. The initial set closed mold height in the program is m0 = H = 1200mm.

[0119] When measured according to the method of the present invention, the first deformation of the slider under nominal pressure was a0 = 0.3 mm, the first deformation of the worktable was b0 = 0.45 mm, and the deformation of the support column was g0 = 1.03 mm.

[0120] Substituting the above data into formulas (1) and (2) respectively, we can calculate K1 = 5.14 × 10 -11 K2 = 7.71 × 10 -11 .

[0121] Let K1 = 5.14 × 10 -11 Given B = 2000 mm and a0 = 0.3 mm, substituting these values ​​into formulas (6) and (9), we get c = 0.24 mm. K2 = 7.71 × 10 -11 Substituting B = 2000mm and b0 = 0.45mm into formulas (8) and (10), we get e = 0.37mm.

[0122] Therefore, when the working pressure is the nominal pressure F0, substituting c = 0.24 mm, e = 0.37 mm and g0 = 1.03 mm into formula (11), the compensation amount n0 under the nominal pressure is calculated as n0 = c + e + g 0＝ 0.24 + 0.37 + 1.03 = 1.64 mm.

[0123] When the working pressure is the nominal pressure, the final set mold closing height dimension m1 in the program is:

[0124] m1=m0+n0=1200+1.64=1201.64mm.

[0125] For example, when the working pressure is F = 8000kN, substituting into formula (12), the compensation amount should be:

[0126] n=F / F0×n0=8000 / 12000×1.64=1.09mm.

[0127] Therefore, when the working pressure F = 8000kN, the final mold closing height set in the program is m2 = m0 + n = 1200 + 1.09 = 1201.09mm.

[0128] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0129] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for determining the compensation amount of the closed die height of a press, the press comprising a slider, a worktable, and a support column, the slider moving vertically relative to the support column, the die located between the worktable and the slider, the die comprising an upper die and a lower die; characterized in that: The method for determining the compensation amount includes the following steps: Under the same working condition, the first function relating the maximum deformation 'a' of the slider to the width 'X' of the slider is: a=K1×(X / 2) 3 The second function relating the maximum deformation b of the worktable to the width Y of the worktable: b=K2×(Y / 2) 3 Wherein, K1 is the first influence coefficient, K2 is the second influence coefficient; the maximum deformation a of the slider is the vertical distance from the bottom end of the slider side to the center position of the slider; the maximum deformation b of the worktable is the vertical distance from the top end of the worktable side to the center position of the worktable; Under nominal pressure F0, the first deformation a0 of the slider, the first deformation b0 of the worktable, and the deformation g0 of the support column are measured. The value of the first influence coefficient is determined based on the first deformation a0 of the slider, the width X of the slider, and the first function; the value of the second influence coefficient is determined based on the first deformation b0 of the worktable, the width Y of the worktable, and the second function. Based on the first function, the value of the first influence coefficient, and the mold width B, the second deformation d of the slider is determined; the second deformation d of the slider is the vertical distance from the top surface of the upper mold to the center position of the slider; based on the second function, the value of the second influence coefficient, and the mold width B, the second deformation f of the worktable is determined; the second deformation f of the worktable is the vertical distance from the bottom surface of the lower mold to the center position of the worktable. Based on the second deformation d of the slider and the first deformation a0 of the slider, the third deformation c of the slider is determined; the third deformation c of the slider is the vertical distance from the bottom end of the side of the slider to the top surface of the upper mold; based on the second deformation f of the worktable and the first deformation b0 of the worktable, the third deformation e of the worktable is determined; the third deformation e of the worktable is the vertical distance from the top end of the side of the worktable to the bottom surface of the lower mold; The sum of the third deformation c of the slider, the third deformation e of the worktable, and the deformation g0 of the support column is the compensation amount n0 under the nominal pressure F0: n0 = c + e + g0 Based on the nominal pressure F0 and the compensation amount n0, determine the target compensation amount n under any pressure F: n = F / F0 × n0.

2. The method for determining the compensation amount of the closed die height of a press according to claim 1, characterized in that, After determining the target compensation amount n under any pressure F, the following steps are also included: The target closed mold height is determined based on the initially set closed mold height and the target compensation amount n in the program. The target closed mold height is the sum of the initially set closed mold height and the target compensation amount n.

3. The method for determining the compensation amount of the closed die height of a press according to claim 1, characterized in that, The determination of the first deformation a0 of the slider includes the following steps: A first bracket is horizontally mounted on the top surface of the workbench, and a first dial indicator and a second dial indicator are mounted on the top surface of the bracket; the pointers of the first dial indicator and the second dial indicator point vertically to the bottom side and center position of the slider, respectively. When the press is not pressurized, both the first dial indicator and the second dial indicator are adjusted to zero. After the pressure of the press reaches the nominal pressure F0, the first difference between the first dial indicator and the second dial indicator is calculated; the first difference is the first deformation a0 of the slider.

4. The method for determining the compensation amount of the closed die height of a press according to claim 1, characterized in that, The determination of the first deformation b0 of the worktable includes the following steps: A second bracket is horizontally mounted on the bottom surface of the slider, and a third and fourth dial indicator are mounted on the bottom surface of the second bracket; the pointers of the third and fourth dial indicators point vertically to the top and center positions of the side of the worktable, respectively. When the press is not pressurized, both the third and fourth dial indicators are adjusted to zero. After the pressure of the press reaches the nominal pressure F0, the second difference between the third and fourth dial indicators is calculated; the second difference is the first deformation b0 of the worktable.

5. The method for determining the compensation amount of the closed die height of a press according to claim 1, characterized in that, The determination of the support deformation g0 includes the following steps: A third bracket is vertically installed at the top side of the workbench, and a fifth dial indicator is installed on the top surface of the third bracket; the pointer of the fifth dial indicator points vertically to the bottom surface of the upper crossbeam of the press. When the press is not pressurized, adjust the pointer of the fifth dial indicator to zero; After the pressure of the press reaches the nominal pressure F0, the value of the fifth dial gauge is read, and the value is the column deformation g0.

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