Press machine displacement measuring device, press machine, press monitoring system, and press forming analysis system

Abstract

This simple configuration measures the deformation behavior of a die during press forming. [Solution] The press machine displacement measuring device measures the displacement of the press machine. The press machine displacement measuring device comprises a measuring instrument 7 and a support member 8. The support member 8 supports the measuring instrument 7 between the bolster 3 and the slider 2, at a position laterally to the mold holders 4a, 4b or molds 5a, 5b. The measuring instrument 7 measures the displacement of the mold holder or the side surface of the mold by measuring the distance to the mold holders 4a, 4b or molds 5a, 5b.

Description

Technical Field

[0001] The present invention relates to a press molding technique using a mold.

Background Art

[0002] Generally, a press device arranges a material to be pressed between one or more molds and brings the one or more molds closer to each other until they reach the bottom dead center, thereby press-molding the material to be pressed into a shape corresponding to the shape of the processing surface of the mold. In press molding, one of the problems is the occurrence of poor shape accuracy. One of the causes of poor shape accuracy of parts is mold deflection. Mold deflection is an elastic deformation that occurs in the mold when a load is applied to the mold during molding.

[0003] Japanese Unexamined Patent Application Publication No. 2018-164939 discloses a measuring device for press molding load. This device includes an upper plate fixed to the slide of a press machine, a lower plate on which an upper mold is set via a holding portion that suspends and holds it, a plurality of support pins connecting the upper plate and the lower plate, and a plurality of load sensors arranged between the upper plate and the lower plate.

[0004] Japanese Unexamined Patent Application Publication No. 201-145247 discloses a dynamic deformation measuring device for a press mold. This device has a plate-shaped measuring jig body that is detachably arranged between a press machine main body having a bolster and a slider and a press mold. A horizontal bar whose both ends are slidably supported on the measuring jig body is provided with an eddy current displacement sensor for detecting the elastic deformation amount of the press mold. A load receiving piece provided on the measuring jig body is provided with a strain gauge for detecting the pressure distribution of the press mold.

[0005] Japanese Patent Publication No. 2004-347354 discloses a device for measuring die displacement during press forming. This device comprises a displacement detection means for detecting the amount of displacement between specific parts of the die, and a load detection means for detecting the punch load, both of which are built into the press die. The displacement detection means detects the amount of displacement between the upper die and the upper surface of the punch at multiple locations. The amount of displacement of each part of the die is measured, and the overall deflection of the die is detected over time.

[0006] Japanese Patent Publication No. 2021-194666 discloses a deformation measurement system for a press machine. The system comprises a displacement sensor for detecting the displacement of the bolster or slide of the press machine, a base beam supporting the displacement sensor, and a die holder attached to the bolster or slide for fixing the die. The die holder has an opening into which the base beam is loosely fitted. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2018-164939 [Patent Document 2] Japanese Patent Publication No. 2011-145247 [Patent Document 3] Japanese Patent Publication No. 2004-347354 [Patent Document 4] Japanese Patent Publication No. 2021-194666 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] In the preparation stage for press-formed parts production, computer-based press-forming analysis is sometimes performed in advance to determine a die shape that will meet dimensional tolerances within the tolerances. However, when press-forming is performed using the actual die shape determined by the analysis, a shape error between the analysis and the actual product almost always occurs. This is likely because the analysis does not consider the elastic deformation of the die, and therefore fails to reproduce the die behavior near the bottom dead center where the load is large. The difference in residual stress caused by the difference in die shape at the bottom dead center between the forming analysis and the actual product is thought to cause a difference in springback (SB) and lead to a decrease in dimensional accuracy. Therefore, measuring the deformation behavior of the die in the actual product is important for improving dimensional accuracy. For example, in the conventional technology described above, measuring instruments that measure the displacement and load in the pressing direction of the die are incorporated into the die in order to measure the deformation behavior of the die. In this case, the structure of the die or die holder becomes complex.

[0009] Therefore, this disclosure discloses a press machine displacement measuring device that can measure the deformation behavior of a die during press forming with a simple configuration. [Means for solving the problem]

[0010] The press machine displacement measuring device in the embodiment of the present disclosure measures the displacement of a press machine having a bolster, a slider, and a mold holder attached to the bolster and the slider, respectively, for holding a mold. The press machine displacement measuring device is Measuring instrument, The system includes a support member for supporting the measuring instrument. The support member supports the measuring instrument between the bolster and the slider, at a position to the side of the mold holder or the mold. The measuring instrument measures the displacement of the side surface of the mold holder or the mold by measuring the distance to the mold holder or the mold. [Brief explanation of the drawing]

[0011] [Figure 1]FIG. 1 is a side view showing an example of a press machine including a press machine displacement measuring device according to the present embodiment. [Figure 2] FIG. 2 is a top view of the press machine shown in FIG. 1. [Figure 3] FIG. 3 is a view showing an example of a state in which the bolster and the slider are deflected by a press load. [Figure 4] FIG. 4 is a top view showing a modified example of the press machine displacement measuring device. [Figure 5] FIG. 5 is a side view showing a modified example of the press machine displacement measuring device. [Figure 6] FIG. 6 is a side view showing a modified example of the press machine displacement measuring device. [Figure 7] FIG. 7 is a perspective view showing a configuration example of the jig 8B. [Figure 8] FIG. 8 is a diagram showing a configuration example of a press monitoring system using the press machine displacement measuring device according to the present embodiment. [Figure 9] FIG. 9 is a diagram showing a configuration example of a press forming analysis system using the measurement result of the press machine displacement measuring device according to the present embodiment.

MODE FOR CARRYING OUT THE INVENTION

[0012] (Configuration 1) The press machine displacement measuring device according to the embodiment of the present disclosure measures the displacement of a press machine having a bolster, a slider, and a die holder attached to each of the bolster and the slider and holding a die. The press machine displacement measuring device includes a measuring instrument, and a support member that supports the measuring instrument. The support member supports the measuring instrument at a position on the side of the die holder or the die between the bolster and the slider. The measuring instrument measures the displacement of the side surface of the die holder or the die by measuring the distance from the die holder or the die.

[0013] The inventors have found that the characteristics of the deformation behavior of the mold during press forming appear in the displacement of the mold holder or the side surface of the mold. For example, in the computer-aided analysis of press forming, it has been found that when simulating under the condition that the mold holder deforms in the lateral direction (the direction perpendicular to the press direction), the difference between the analysis result and the experimental result becomes smaller. In the above Configuration 1, the displacement in the depth direction when the mold holder or the mold is viewed from the side is measured by the measuring instrument. The displacement measured in this way reflects the characteristics of the deformation behavior of the mold. Therefore, according to Configuration 1, the deformation behavior of the mold during press forming can be measured with a simple configuration.

[0014] (Configuration 2) In the above Configuration 1, the support member in the region outside the mold holder when viewed from the press direction, a base portion slidably supported by the bolster or the slider, and a jig that extends in the press direction from the base portion and holds the measuring instrument between the bolster and the slider may be provided. The base portion is arranged so as to overlap the mold holder when viewed from either the longitudinal direction or the short-side direction of the bolster or the slider that supports the base portion, and the dimensions can be made longer than those of the mold holder in both the longitudinal direction and the short-side direction. As a result, the amount of deflection of the bolster or the slider due to the press load becomes larger in the region of the mold holder than in the region outside the mold holder. According to Configuration 2, even when the bolster or the slider deflects, the base portion provided outside the mold holder can maintain its posture. Therefore, the measuring instrument can be supported so that the relative position of the measuring instrument with respect to the mold holder or the mold in the direction perpendicular to the press direction does not change due to the elastic deformation of the bolster or the slider caused by the press load. Note that the base portion may be slidably supported in a state of direct contact with the bolster or the slider, or may be slidably supported via a member such as a support tool. The base portion is, for example, slidably supported from below with respect to the bolster or the slider.

[0015] (Configuration 3) In the above configuration 1 or 2, the base portion is Viewed from the pressing direction, a pair of base body portions are arranged on both sides of the mold holder, in the longitudinal or transverse direction of the bolster or slider that supports the base portion, over a range longer than the dimensions of the mold holder, It may also have a beam section that spans between the pair of base body sections. This allows the support member to support the measuring instrument in a simple configuration such that the relative position of the measuring instrument to the mold holder or mold, in a direction perpendicular to the pressing direction, does not change due to the elastic deformation of the bolster or slider caused by the pressing load.

[0016] (Composition 4) In any of the above configurations 1 to 3, a plurality of measuring instruments may be provided, and the plurality of measuring instruments may be supported on the support member in line in at least one direction, either in the pressing direction or perpendicular to the pressing direction. This allows for efficient measurement of the displacement distribution on at least a portion of the sides of the mold holder and the mold. The measuring direction of the plurality of measuring instruments may be, for example, perpendicular to the pressing direction.

[0017] (Composition 5) In any of the above configurations 1 to 4, the support member may be configured such that the mounting position of the measuring instrument is movable. This allows the position of the measuring instrument to be changed to suit the structure of the mold holder or mold.

[0018] (Composition 6) A press machine including any of the above configurations 1 to 5 for measuring press machine displacement is also included in the embodiments of the present invention. The press machine is Bolster and, Slider and, A mold holder is attached to each of the bolster and the slider, and holds the mold. A press machine displacement measuring device comprising any of the above configurations 1 to 5,

[0019] (Composition 7) The press monitoring system in the embodiments of this disclosure is a press monitoring system that monitors the operation of a press machine having a bolster, a slider, and a mold holder attached to the bolster and the slider respectively for holding a mold. A displacement acquisition unit that acquires the displacement of the mold holder or the mold in a direction perpendicular to the pressing direction, measured by a measuring instrument positioned between the bolster and the slider, A control state acquisition unit that acquires the control state of the press machine, The system includes an operation determination unit that determines the operation of the press machine based on the displacement of the mold holder or the mold in a direction perpendicular to the pressing direction, and the control state.

[0020] In configuration 7, the displacement acquired by the displacement acquisition unit reflects the characteristics of the mold's deformation behavior. Therefore, configuration 7 allows for the measurement and monitoring of the mold's deformation behavior during press forming with a simple configuration. The displacement acquisition unit may acquire, for example, the displacement measured by the measuring instrument of any of the press machine displacement measuring devices in configurations 1 to 5. The control state acquisition unit may acquire, for example, at least one of the press forming load and press stroke as the control state.

[0021] (Composition 8) The press forming analysis system in the embodiments of this disclosure is A displacement acquisition unit that acquires the displacement of a mold holder attached to each of the bolster and slider, or the displacement of a mold held by the mold holder, in a direction perpendicular to the pressing direction, as measured by a measuring instrument positioned between the bolster and the slider, Based on the displacement acquired by the displacement acquisition unit, an analysis model setting unit sets an analysis model of the mold holder or the mold, The system includes an analysis unit that performs a press forming simulation using the aforementioned analysis model.

[0022] According to configuration 8, the deformation behavior of the die during press forming, measured with a simple configuration, can be reflected in the analysis model, thereby improving the accuracy of the analysis.

[0023] Embodiments of the present invention also include a program that causes a computer to operate as the press monitoring system or press forming analysis system, a non-transitory recording medium storing the program, and a program product containing the program.

[0024] The embodiments of the present invention will be described in detail below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and their descriptions will not be repeated. The dimensional ratios between the constituent members shown in each drawing do not necessarily represent the actual dimensional ratios.

[0025] Figure 1 is a side view showing an example of a press machine including a press machine displacement measuring device in this embodiment. Figure 2 is a top view of the press machine shown in Figure 1. In Figures 1 and 2, an xyz orthogonal coordinate system is defined with the pressing direction as the z-axis. Figure 1(a) is a side view of the press machine viewed from the y-direction. Figure 1(b) is a side view of the press machine viewed from the x-direction.

[0026] As shown in Figure 1, the press machine includes a slider 2, a bolster 3, a die holder 4a attached to the slider 2, a die holder 4b attached to the bolster 3, and dies 5a and 5b held by the die holders 4a and 4b, respectively. The press machine is equipped with a press machine measuring device for measuring the displacement of the press machine. The press machine measuring device comprises a measuring instrument 7 and a support member 8 that supports the measuring instrument 7. The measuring instrument 7 is supported by the support member 8 at a position between the bolster 3 and the slider 2, on the side of the die holders 4a and 4b or the dies 5a and 5b. The measuring instrument 7 measures the displacement of the sides of the die holders 4a and 4b or the dies 5a and 5b by measuring the distance to the die holders 4a and 4b or the dies. With this configuration, the deformation behavior of the dies during press forming can be measured with a simple configuration.

[0027] In the example shown in Figure 1, the mold includes a pair of molds 5a and 5b. The mold has a surface shape to transfer onto the material. That is, the mold has a molding surface corresponding to the target shape of the press-formed product. For example, one of the pair of molds 5a and 5b may be a die and the other a punch. The mold may also include at least one die pad or punch pad. One mold 5a is fixed to a mold holder 4a which is attached to a slider 2. The other mold 5b is fixed to a mold holder 4b which is attached to a bolster 3.

[0028] Figure 2 is a top view showing the configuration of slider 2 in perspective. As shown in Figure 2, bolster 3 is a plate-like body and has a rectangular shape with long and short sides when viewed from above (i.e., from the pressing direction). Bolster 3 has a thickness corresponding to the allowable load (pressing capacity) of the press machine. Bolster 3 is, for example, a steel plate-like body. In order to suppress deformation when subjected to the reaction force of the pressing load, the lower surface of bolster 3 may be supported surfacely by a foundation structure with high rigidity, such as a floor slab.

[0029] Slider 2 is a plate-like body and has a rectangular shape with a long side and a short side when viewed from above (i.e., from the pressing direction). Slider 2 has a thickness corresponding to the allowable load (pressing capacity) of the press machine. To suppress deformation when subjected to the reaction force of the pressing load, the top surface of Slider 2 may be reinforced with a beam (not shown). Note that the slider may also be called a slide or ram. In this example, the longitudinal and short directions of Slider 2 are the same as the longitudinal and short directions of Bolster 3, but these directions may be different.

[0030] Slider 2 reciprocates relative to bolster 3 in the pressing direction P (for example, vertical direction). The die holder 4a and die 5a attached to slider 2 reciprocate, causing dies 5a and 5b to press-form the material. The press machine has a drive mechanism (not shown) that causes slider 2 to reciprocate relative to bolster 3. The drive mechanism includes, for example, a support column that connects bolster 3 and slider 2 and guides the reciprocating motion of slider 2, a power source that supplies power to reciprocate slider 2 along the support column, and a transmission mechanism that transmits power. The power source is, for example, an electric motor or an electric hydraulic motor.

[0031] As shown in Figure 1, the support member 8 of the measuring instrument has a base portion 8A and a jig 8B attached to the base portion 8A and holding the measuring instrument 7. In the example of Figure 1, the base portion 8A is slidably supported on the bolster 3. That is, the base portion 8A is supported so as to be able to move relative to the bolster 3 in a direction perpendicular to the pressing direction. In the example of Figure 1, the base portion 8A is placed on the upper surface of the bolster 3. The lower surface of the base portion 8A is slidably supported on the upper surface of the bolster 3. Thus, the base portion 8A may be slidably supported from below relative to the bolster 3. The jig 8B extends from the base portion 8A in the pressing direction and holds the measuring instrument 7 between the slider 2 and the bolster 3.

[0032] As shown in Figure 2, the base portion 8A is supported by the bolster in the area outside the die holders 4a and 4b when viewed from the pressing direction. The base portion 8A is positioned so as to overlap with the die holders 4a and 4b when viewed from either the longitudinal or transverse direction of the bolster 3 (see also Figure 1). Furthermore, the base portion 8A is longer than the die holders 4a and 4b in both the longitudinal and transverse directions of the bolster 3.

[0033] In the example shown in Figure 1, the entire lower surface of the base portion 8A is supported in contact with the upper surface of the bolster 3 in an unloaded state. The base portion support configuration is not limited to this. For example, the base portion 8A may have protrusions on its lower surface as legs (see, for example, 8Aa in Figure 5). In this case, the legs are supported in contact with the bolster 3. Alternatively, the base portion 8A may be supported by the slider 2 instead of the bolster 3. In this case as well, the base portion 8A may be positioned so as to overlap with the mold holders 4a and 4b when viewed from either the longitudinal or transverse direction of the slider 2. Furthermore, the base portion 8A can be made longer than the mold holders 4a and 4b in either the longitudinal or transverse direction of the slider 2. Additionally, the base portion 8A may be slidably supported in direct contact with the bolster 3 or the slider 2, or it may be slidably supported via a support such as a bracket.

[0034] The base portion 8A may be slidably supported on the bolster 3 or slider 2 at at least three points: two points in the longitudinal direction of the bolster 3 or slider 2 supporting the base portion 8A that are spaced further apart than the dimensions of the mold holders 4a and 4b, and a point in the short direction of the bolster 3 or slider 2 supporting the base portion 8A that is spaced further apart from either of these two points than the dimensions of the mold holders 4a and 4b.

[0035] In the example shown in Figure 2, the base portion 8A has a pair of base body portions 8A1 and a beam portion 8A2 that spans between the pair of base body portions 8A1. The pair of base body portions 8A1 are positioned on both sides of the die holders 4a and 4b, as viewed from the pressing direction, in the longitudinal direction of the bolster 3, over a range longer than that of the die holders 4a and 4b. That is, the die holders 4a and 4b are positioned between the pair of base body portions 8A1, and the dimensions of the pair of base body portions 8A1 in the longitudinal direction of the bolster 3 are longer than the dimensions of the die holders 4a and 4b. As a modification, the base body portions 8A1 may be positioned on both sides of the die holders 4a and 4b, as viewed from the pressing direction, in the short direction of the bolster 3, over a range longer than that of the die holders 4a and 4b.

[0036] Figure 3 shows an example of the bolster 3 and slider 2 being deflected by the press load. The amount of deflection of the bolster 3 and slider 2 is greater in the area where the die holder is attached than in the surrounding area. The base portion 8A is slidably supported by the bolster 3 in the area outside the die when viewed from the press direction, so that the base portion 8A can maintain its position even when the bolster 3 is deflected. This allows the measuring instrument 7 to be supported in such a way that its relative position to the die holder or die in the direction perpendicular to the press direction does not change due to the elastic deformation of the bolster 3 or slider 2 caused by the press load. From this viewpoint, it is preferable that the base portion 8A is supported by the bolster 3 at a position where the amount of deflection of the bolster 3 due to the press load is relatively small.

[0037] For example, referring to Figure 2, it is preferable that the base portion 8A is slidably supported by the bolster 3 in at least three of the four corner regions of the bolster 3 when viewed from the pressing direction. In this case, the four corner regions of the bolster 3 can be, for example, the region at a distance of 0.25 times the longitudinal dimension L of the bolster 3 (0.25L) from the longitudinal end of the bolster 3 when viewed from the pressing direction, and the region at a distance of 0.25 times the short-side dimension W of the bolster 3 (0.25W) from the short-side end of the bolster 3. In the example in Figure 2, the regions indicated by diagonal hatching represent the range of the four corners of the bolster 3. If the base portion 8A is supported by the slider 2, similarly, it is preferable that the base portion 8A is slidably supported by the slider 2 in at least three of the four corner regions of the slider 2 when viewed from the pressing direction. In this case as well, the areas at the four corners of the slider 2 as viewed from the pressing direction are areas at a distance of 0.25 times the longitudinal dimension of the slider 2, and can also be areas at a distance of 0.25 times the longitudinal dimension of the slider 2 from the short end of the slider 2.

[0038] In the example shown in Figures 1 and 2, the press machine displacement measuring device comprises a plurality of measuring instruments 7. The plurality of measuring instruments 7 are supported by a support member 8, arranged in a direction perpendicular to the pressing direction. That is, the plurality of measuring instruments 7 are positioned at different locations relative to each other in a direction perpendicular to the pressing direction. The direction of the distance measured by the plurality of measuring instruments 7 is the same. The plurality of measuring instruments 7 can efficiently measure the distribution of displacement of at least some of the side surfaces of the die holders 4a, 4b and the dies 5a, 5b in a direction perpendicular to the pressing direction. The measuring instruments 7 may also be configured to move and scan in a direction perpendicular to the pressing direction. In this configuration as well, the distribution of displacement of the side surfaces in a direction perpendicular to the pressing direction can be measured.

[0039] In the example shown in Figure 1, the support member 8 is configured to allow for movable mounting positions of the multiple measuring instruments 7 in the pressing direction. This allows the multiple measuring instruments 7 to be positioned appropriately according to the structure of the mold holders 4a, 4b or molds 5a, 5b being measured.

[0040] As a variation, the multiple measuring instruments 7 may be supported by the support member 8 in a line in the pressing direction. That is, the multiple measuring instruments 7 may be positioned at different locations in the pressing direction. The direction of the distance measured by the multiple measuring instruments 7 is the same. This makes it possible to measure the distribution of displacement of the side surface in the pressing direction. The measuring instruments 7 may also be configured to move and scan in a direction perpendicular to the pressing direction. In this configuration as well, it is possible to measure the distribution of displacement of the side surface in a direction perpendicular to the pressing direction.

[0041] Furthermore, multiple sets of measuring instruments 7, arranged perpendicular to the pressing direction, may be placed in the pressing direction. That is, multiple measuring instruments 7 may be supported by a support member 8, arranged in both the pressing direction and the direction perpendicular to the pressing direction. This makes it possible to measure the displacement distribution of the side surface in both the pressing direction and the direction perpendicular to the pressing direction.

[0042] Figure 4 is a top view showing a modified example of a press machine displacement measuring device. Figure 4 is a top view of slider 2 seen through. In the example of Figure 4, the press machine displacement measuring device includes a measuring instrument 7 for measuring distance in a first direction (x direction) and a measuring instrument 7 for measuring distance in a second direction (y direction) different from the first direction. Thus, the press machine displacement measuring device may be equipped with multiple measuring instruments for measuring distances in different directions. This allows, for example, the displacement of different sides of mold holders 4a, 4b or molds 5a, 5b to be measured, respectively. In the example of Figure 4, the first direction and the second direction are two different directions in a plane perpendicular to the pressing direction. In the example of Figure 4, the first direction and the second direction are orthogonal to each other. In addition, multiple measuring instruments 7 for measuring distance in the first direction are provided, and multiple measuring instruments 7 for measuring distance in the second direction are also provided.

[0043] Figure 5 is a side view showing a modified example of a press machine displacement measuring device. In the example in Figure 5, a measuring instrument 9 is provided on the base portion 8A to measure the displacement of the upper surface of the bolster 3 by measuring the distance from the bolster 3. This allows for more detailed measurement of the deformation behavior of the press machine, including the die, with a simple configuration. In the example in Figure 5, multiple measuring instruments 9 for measuring the displacement of the bolster 3 are provided on the base portion 8A. The measurement direction of the multiple measuring instruments 9 may be the same as, for example, the press direction. The multiple measuring instruments 9 are arranged in a direction perpendicular to the press direction. As an example, the multiple measuring instruments 9 are arranged in a line along the longitudinal direction of the base portion 8A. For example, the longitudinal direction of the base portion 8A may substantially coincide with the longitudinal direction of the bolster 3. Also, the multiple measuring instruments 9 may be positioned close to the die holders 4a and 4b. In the example in Figure 5, the measuring instruments 9 are positioned in a location that overlaps with the die holders 4a and 4b in the longitudinal direction of the bolster 3, that is, in a location that overlaps with the die holders 4a and 4b when viewed from the short direction of the bolster 3. As a variation, a measuring instrument may be provided on the base portion 8A to measure the displacement of the lower surface of the slider 2 by measuring the distance to the slider 2.

[0044] In the example shown in Figure 5, the base portion 8A has protrusions 8Aa on its lower surface as legs. The protrusions 8Aa can be provided on the base portion 8A in at least three of the four corner regions of the bolster 3 when viewed from the pressing direction (for example, the areas with diagonal hatching in Figure 3).

[0045] Figure 6 is a side view showing a modified example of a press machine displacement measuring device. In the example in Figure 6, the base portion 8A is slidably supported on the slider 2. That is, the base portion 8A is supported so as to be able to move relative to the slider 2 in a direction perpendicular to the pressing direction. In the example in Figure 6, the base portion 8A is slidably supported from below on the slider 2 via a support 2a suspended from the slider 2. The base portion 8A is slidable relative to the support 2a. Specifically, the shaft of the support 2a passes through the elongated hole 8Ah of the base portion 8A. The shaft of the support 2a is slidable with respect to the elongated hole 8Ah of the base portion 8A. That is, the shaft of the support 2a slidably supports the inner circumferential surface of the elongated hole in the base portion 8A from below. This example is an example of a configuration in which the base portion is slidably supported on the slider from below. The jig 8B extends from the base portion 8A in the pressing direction and holds the measuring instrument 7 between the slider 2 and the bolster 3.

[0046] The base portion 8A in Figure 6 is supported by the slider 2 in the area outside the die holders 4a and 4b when viewed from the pressing direction. The base portion 8A is positioned so as to overlap with the die holders 4a and 4b when viewed from either the longitudinal or transverse direction of the slider 2. Furthermore, the base portion 8A is longer than the die holders 4a and 4b in both the longitudinal and transverse directions of the slider. For example, the bolster 3 in Figure 2 can be replaced with the slider 2.

[0047] Figure 7 is a perspective view showing an example configuration of the jig 8B. The jig 8B has a connecting portion 8B3 connected to the base portion 8A, a support column 8B2 extending from the connecting portion 8B3, and a beam 8B1 attached to the support column 8B2. The beam 8B1 extends in a direction perpendicular to the pressing direction. The measuring instrument 7 is attached to the beam 8B1. The connecting portion 8B3 has, as an example, a recess that fits into the beam portion 8A2 of the base portion 8A. The configuration of the connecting portion 8B3 is not limited to this. For example, the connecting portion 8B3 may be plate-shaped. The connecting portion 8B3 is attached to the beam portion 8A2 of the base portion 8A by, for example, fastening with a fastener, bonding, or welding. The fastener is, for example, a screw such as a bolt. The connecting portion 8B3 may be formed integrally with the support column 8B2. That is, the connecting portion 8B3 may be part of the support column 8B2.

[0048] The mounting position of beam 8B1 to column 8B2 is configured to be movable. For example, beam 8B1 may be slidably connected along a guide (e.g., a groove or rail) provided on column 8B2. In this case, beam 8B1 can be mounted at any position within the movable range of beam 8B1 in the guide of column 8B2. The extending direction of the guide of column 8B2 includes a component in the pressing direction. Therefore, the mounting position, i.e., mounting height, of beam 8B1 in the pressing direction is variable. Multiple beams 8B1 may be mounted to column 8B2.

[0049] The mounting position of the measuring instrument 7 on beam 8B1 may be configured to be movable. For example, the measuring instrument 7 may be slidably connected along a guide (e.g., a groove or rail) provided on beam 8B1. In this case, the measuring instrument 7 can be mounted at any position within the movable range of the measuring instrument 7 on the guide of beam 8B1. The extending direction of the guide of beam 8B1 includes a component perpendicular to the pressing direction. Therefore, the mounting position of the measuring instrument 7 perpendicular to the pressing direction is variable. Multiple measuring instruments 7 may be mounted on beam 8B1. Alternatively, multiple beams 8B1 may be mounted on the support column 8B2, and multiple measuring instruments 7 may be mounted on each of the multiple beams 8B1. This allows for efficient measurement of the displacement distribution in the pressing direction and in the direction perpendicular to the pressing direction.

[0050] Figure 8 shows an example of the configuration of a press monitoring system using a press machine displacement measuring device in this embodiment. The press monitoring system 20 comprises a displacement acquisition unit 21, a control state acquisition unit 22, and an operation determination unit 23. The displacement acquisition unit 21 acquires the displacement of the die holders 4a, 4b or dies 5a, 5b in a direction perpendicular to the pressing direction. The displacement acquisition unit 21 acquires the displacement from the measuring instrument 7 of the press machine displacement measuring device. That is, it acquires the displacement of the side surface of the die holder or die, which is measured by the measuring instrument 7, which is positioned between the bolster 3 and the slider 2 and measures the distance to the die holder or die.

[0051] The control state acquisition unit 22 acquires the control state of the press machine. As the control state, for example, information regarding the press load of the press machine is acquired. For example, information indicating whether it is in an unloaded state or a state where a press load is applied may be acquired. In this case, the displacement acquisition unit 21 can acquire the displacement according to the control state of the press load. For example, the displacement acquisition unit 21 can acquire the displacement measured when it is unloaded and the displacement measured when a press load is applied. This makes it possible to detect changes in displacement due to the press load.

[0052] The control state acquisition unit 22 may acquire the control state from, for example, the control device 10 of the press machine. The control device 10 controls the press forming operation by the press machine by controlling the drive mechanism 11 of the press machine. The drive mechanism 11 causes the slider 2 to reciprocate relative to the bolster 3.

[0053] The operation determination unit 23 determines the operation of the press machine based on the displacement of the mold holders 4a, 4b or molds 5a, 5b in a direction perpendicular to the pressing direction, acquired by the displacement acquisition unit 21, and the control state acquired by the control state acquisition unit 22. The operation determination unit 23 can, for example, detect changes in displacement according to the control state using the displacement measured at each control state. By determining the operation of the press machine based on the changes in displacement according to the control state, the deformation behavior of the press machine, including the molds, can be monitored. As an example, the operation determination unit 23 can monitor the deformation behavior of the press machine, including the molds, based on the change in displacement due to the press load detected by the displacement measured in the no-load state and the displacement measured when a press load is applied, and determine whether there is any abnormality in the operation.

[0054] The operation determination unit 23 can, for example, determine whether the deformation behavior of the press machine, including the molds, is within a preset range. For example, if the change in displacement when a press load is applied exceeds a predetermined range compared to the displacement of the sides of the mold holders 4a, 4b or the molds 5a, 5b in an unloaded state, the operation determination unit 23 can determine that the deformation behavior exceeds the set range. The operation determination unit 23 may also determine the operation of the press machine based on the displacement of multiple sides of the mold holders 4a, 4b or the molds 5a, 5b. This allows, for example, monitoring of deformation behavior that reflects the balance state of the mounting of the mold holders 4a, 4b or the molds 5a, 5b. The operation determination unit 23 may also determine the operation of the press machine based on the distribution of displacement on at least some of the sides of the mold holders 4a, 4b and the molds 5a, 5b when a press load is applied.

[0055] The press monitoring system 20 may output the judgment result of the operation judgment unit 23. The form of output is not particularly limited, but may include, for example, display on a screen, audio output, recording to a recording device, transmission of judgment result data, etc. For example, the displacement acquisition unit 21 and the control state acquisition unit 22 may acquire the displacement and control state in real time during the press forming operation of the press machine, and the operation judgment unit 23 may judge the operation of the press machine in real time during the press forming operation. In this case, the judgment result is output in real time during the press forming operation.

[0056] Figure 9 shows an example of the configuration of a press forming analysis system using the measurement results of the press machine displacement measuring device in this embodiment. The press forming analysis system 30 comprises a displacement acquisition unit 31, an analysis model setting unit 32, and an analysis unit 33. The displacement acquisition unit 31 acquires the displacement of the die holders 4a, 4b or dies 5a, 5b in a direction perpendicular to the pressing direction. The displacement acquisition unit 31 acquires the displacement measured by the measuring instrument 7 of the press machine displacement measuring device. The displacement acquisition unit 31 may also acquire the displacement by reading data showing the measurement results of the measuring instrument 7 recorded in a recording device. The acquired displacement may be, for example, the measured displacement value itself, or a value obtained based on the measured displacement value. For example, the change in displacement when a press load is applied relative to the displacement in an unloaded state may be acquired.

[0057] The analysis model setting unit 32 sets the analysis model of the mold holders 4a, 4b or molds 5a, 5b based on the displacements acquired by the displacement acquisition unit 31. For example, based on the acquired displacements, parameters of the analysis model relating to the displacement of the mold holders 4a, 4b or molds 5a, 5b in the direction perpendicular to the pressing direction may be determined. For example, the displacement range of the mold holder or mold model in the direction perpendicular to the pressing direction may be determined based on the acquired displacements. Alternatively, boundary conditions in the analysis may be determined based on the acquired displacements. The analysis model may be, for example, data representing the mold holders 4a, 4b or molds 5a, 5b using a plurality of finite elements.

[0058] The analysis unit 33 performs a press forming simulation using the analysis model set in the analysis model setting unit 32. The analysis unit 33 may, for example, use the wired element method to perform a press forming simulation with a finite element analysis model.

[0059] The press forming analysis system 30 allows the analysis model to set displacement conditions in the same direction based on the actual measured displacement of the die holders 4a, 4b or dies 5a, 5b in a direction perpendicular to the pressing direction. This improves the accuracy of the analysis.

[0060] The press monitoring system 20 and the press forming analysis system 30 are comprised of one or more computers equipped with a processor and memory. The functions of the displacement acquisition unit 21, the control state acquisition unit 22, the operation determination unit 23, the displacement acquisition unit 31, the analysis model setting unit 32, and the analysis unit 33 can be realized by the processor executing a predetermined program. Such a program and a non-transitory storage medium storing it, or a computer-readable program product containing such a program, are also included in embodiments of this disclosure.

[0061] The present invention is not limited to the embodiments described above. For example, the base portion of the support member may be supported in a location that is not affected by the elastic deformation caused by the press load of the bolster and slider, such as being part of a structure such as the floor, walls, or ceiling of the building where the press machine is installed. Also, in the above example, the slider is placed on top of the bolster, but the bolster may be placed on top of the slider. Furthermore, the pressing direction does not have to be vertical.

[0062] Although one embodiment of the present invention has been described above, the above-described embodiments are merely illustrative examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiments, and it is possible to carry out the above-described embodiments by appropriately modifying them without departing from the spirit of the present invention. [Explanation of Symbols]

[0063] 2: Slider 3: Bolster 4a, 4b: Mold holder 5a, 5b: Mold 7: Measuring instrument 8: Support member 8A: Base section 8B: Jig 20: Press monitoring system 21: Displacement acquisition unit 22: Control state acquisition unit 23: Operation judgment section

Claims

1. A press machine displacement measuring device for measuring the displacement of a press machine having a bolster, a slider, and a mold holder attached to the bolster and the slider respectively for holding a mold, Measuring instrument, The measuring instrument is provided with a support member, The support member supports the measuring instrument between the bolster and the slider, at a position lateral to the mold holder or the mold. The measuring instrument measures the displacement of the side surface of the mold holder or the mold by measuring the distance to the mold holder or the mold, The aforementioned support member is A base portion is slidably supported by the bolster or the slider in the area outside the mold holder when viewed from the pressing direction, The base portion extends in the pressing direction and includes a jig that holds the measuring instrument between the bolster and the slider, The base portion is positioned so as to overlap with the mold holder when viewed from either the longitudinal or transverse direction of the bolster or slider that supports the base portion, and is longer in dimensions than the mold holder in both the longitudinal and transverse directions, in a press machine displacement measuring device.

2. A press machine displacement measuring device according to claim 1, The base portion is Viewed from the pressing direction, a pair of base body portions are arranged on both sides of the mold holder, in the longitudinal or transverse direction of the bolster or slider that supports the base portion, over a range longer than the dimensions of the mold holder, A press machine displacement measuring device having a beam section that spans between the pair of base body sections.

3. A press machine displacement measuring device according to claim 1, Multiple measuring instruments are provided, A press machine displacement measuring device in which the plurality of measuring instruments are supported by the support member in a line in at least one direction in the pressing direction and a direction perpendicular to the pressing direction.

4. A press machine displacement measuring device according to any one of claims 1 to 3, The support member is configured to allow for the movable mounting position of the measuring instrument, and is a press machine displacement measuring device.

5. Bolster and, Slider and, A mold holder is attached to each of the bolster and the slider, and holds the mold. A press machine displacement measuring device according to any one of claims 1 to 3, A press machine equipped with the following features.

6. A press monitoring system for monitoring the operation of a press machine having a bolster, a slider, and a mold holder attached to the bolster and the slider respectively for holding a mold, A press displacement measuring device according to any one of claims 1 to 3, A displacement acquisition unit that acquires the displacement of the mold holder or the mold in a direction perpendicular to the pressing direction, measured by the measuring instrument positioned between the bolster and the slider, A control state acquisition unit that acquires the control state of the press machine, An operation determination unit that determines the operation of the press machine based on the displacement of the mold holder or the mold in a direction perpendicular to the pressing direction, and the control state, Equipped with a press monitoring system.

7. A press displacement measuring device according to any one of claims 1 to 3, A displacement acquisition unit that acquires the displacement of a mold holder attached to each of the bolster and slider, or a mold held by the mold holder, in a direction perpendicular to the pressing direction, as measured by the measuring instrument positioned between the bolster and the slider, Based on the displacement acquired by the displacement acquisition unit, an analysis model setting unit sets an analysis model of the mold holder or the mold, A press forming analysis system comprising an analysis unit that performs a press forming simulation using the aforementioned analysis model.

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