CN110020487B - Compensation Method for Deflection and Deformation of Binder Ring of Drawing Die - Google Patents
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Abstract
Description
技术领域technical field
本发明涉及冲压模具制造技术领域,更具体的说,涉及一种拉延模具压边圈挠度变形补偿方法。The invention relates to the technical field of stamping die manufacturing, and more specifically relates to a method for compensating deflection deformation of a blank holder of a drawing die.
背景技术Background technique
伴随着产品的升级及生产效率要求的不断提高,冲压模具的大型化、一模多件化的趋势日益明显。伴随着模具幅面的增加以及工作载荷的增加,模具压边圈的挠度变形量也发生明显的增加。With the upgrading of products and the continuous improvement of production efficiency requirements, the trend of large-scale stamping dies and multiple parts of one die is becoming increasingly obvious. With the increase of the mold width and the increase of the working load, the deflection and deformation of the blank holder of the mold also increase significantly.
对于拉延冲压模具来说,压边圈的挠度变形会导致压边圈与上模的合模间隙不均匀,使得模具之间的接触力分布无法实现设计意图,引起零件开裂、起皱等质量问题。For drawing stamping dies, the deflection deformation of the blank holder will lead to uneven clamping gap between the blank holder and the upper die, so that the contact force distribution between the dies cannot realize the design intention, causing parts cracking, wrinkling and other quality question.
为解决这一问题,通常需要对压边圈的型面进行人工研配,以逐步消除不均匀的合模间隙。但是,单纯的依靠人工研配的方法,研配工作量过大,不仅导致人力成本高,而且调试的周期也很长。伴随着市场竞争的加剧,产品更新与升级的日益频繁,企业成本控制要求越来越严格,传统的人工研配的方法已无法适应当前对于模具开发的短周期、低成本的要求。In order to solve this problem, it is usually necessary to manually research and match the profile of the blank holder to gradually eliminate the uneven clamping gap. However, relying solely on manual research and matching methods, the workload of research and matching is too large, which not only leads to high labor costs, but also a long debugging cycle. With the intensification of market competition, product updates and upgrades are becoming more and more frequent, and the cost control requirements of enterprises are becoming more and more stringent. The traditional method of manual research and matching can no longer meet the current short-cycle and low-cost requirements for mold development.
针对上述问题,另一种解决问题的思路是,在模具设计阶段,在原始压边圈的加工数据基础上,叠加一个与挠度变形趋势相反的型面变形处理以抵消其挠度变形。In view of the above problems, another way to solve the problem is to superimpose a surface deformation process opposite to the deflection deformation trend on the basis of the processing data of the original blank holder in the mold design stage to offset the deflection deformation.
但是,如何对拉延模具压边圈的挠度变形进行准确有效的预判是一个行业难点问题。压边圈的挠度变形行为受模具结构、压机结构、零件造型、工艺设计等诸多复杂因素的影响。目前,无论是解析推理、经验公式或行业经验,都无法获取准确的压边圈挠度变形分布,补偿效果并不理想,技术瓶颈有待突破。However, how to accurately and effectively predict the deflection deformation of the blank holder of the drawing die is a difficult problem in the industry. The deflection deformation behavior of blank holder is affected by many complex factors such as mold structure, press structure, part shape, process design and so on. At present, no matter it is analytical reasoning, empirical formula or industry experience, it is impossible to obtain accurate deflection and deformation distribution of blank holder, the compensation effect is not ideal, and the technical bottleneck needs to be broken through.
现阶段,模具行业大多是依靠基于过往项目的个人经验进行挠度变形预判,技术手段的准确性、可靠性、普遍适用性无法得到保证。At this stage, the mold industry mostly relies on personal experience from past projects to predict deflection and deformation, and the accuracy, reliability, and universal applicability of technical means cannot be guaranteed.
发明内容Contents of the invention
本发明的目的是提供一种拉延模具压边圈挠度变形补偿方法,解决拉延模具压边圈挠度变形导致合模间隙不均匀的问题。The object of the present invention is to provide a method for compensating deflection and deformation of the binder ring of a drawing die, so as to solve the problem that the deflection and deformation of the binder ring of the drawing die lead to uneven clamping gaps.
为了实现上述目的,本发明提供了一种拉延模具压边圈挠度变形补偿方法,包括以下步骤:In order to achieve the above object, the present invention provides a method for compensating the deflection and deformation of the blank holder of a drawing die, comprising the following steps:
步骤一、采用有限元法分析压边圈挠度变形,对补偿处理模型进行建模,建模参数进行定义,所述建模参数包括几何造型结构建模、组件材料性能、单元类型与网格尺寸划分、分析步和求解算法、接触关系及边界条件;
步骤二、在压边圈的关键位置选取一组参考点,根据挠度变形分析结果,以挠度变形量最小的参考点为基准,依次计算其余参考点的相对挠度变形量,作为各参考点的补偿量值,所有参考点的位置信息及对应的补偿量值构成挠度变形补偿方案;
步骤三、在补偿处理模型中,导入需要做补偿处理的压边圈型面以及所有的参考点,对每一个参考点,根据挠度变形补偿方案,生成各自对应的目标点,采用多点控制法对压边圈实现多点控制的整体变形处理。
在一实施例中,所述补偿处理模型由计算机辅助软件建立。In one embodiment, the compensation process model is created by computer-aided software.
在一实施例中,所述步骤一中几何造型结构建模,具体包括模具、压力机及相关的应力传递组件的造型结构建模。In an embodiment, the modeling of the geometric modeling structure in the first step specifically includes the modeling of the modeling structure of the mold, the press and related stress transfer components.
在一实施例中,所述步骤一中组件材料性能,具体包括模具及压力机组件为弹性变形体,由弹性模量和泊松比来定义组件材料的弹性变形性能。In one embodiment, the properties of the component materials in the
在一实施例中,所述步骤一中组件材料为铸铁材料,弹性模量选用范围为105~155GPa,泊松比选用范围为0.2~0.3。In one embodiment, the component material in the
在一实施例中,所述步骤一中单元类型与网格尺寸划分,具体包括,单元类型为Tet实体单元,网格大小控制范围为25~75mm。In one embodiment, the unit type and grid size division in the
在一实施例中,所述步骤一中分析步和求解算法,具体包括,采用静力隐式算法,设定分析步、初始步长、最大增量步长和最小可接受的增量步长。In one embodiment, the analysis step and solution algorithm in
在一实施例中,所述步骤一中所述建模参数包括接触关系,具体为各组件的接触面之间根据相对滑动关系定义不同接触关系,对于接触面之间有相对滑移的,定义相对滑动时的摩擦力及正压力,对于接触面之间无相对位移的,简化接触关系为连接关系。In one embodiment, the modeling parameters in
在一实施例中,所述步骤一中所述建模参数包括边界条件,具体包括根据冲压工艺、模具结构、压力机结构进行设定,沿冲压方向Z向确保受力的平衡,在X和Y方向根据导向元件定义相应的边界条件。In one embodiment, the modeling parameters in
在一实施例中,所述步骤二中参考点的选取位置在压边圈拉延筋以内的管理面区域以及料片外轮廓。In one embodiment, the selected position of the reference point in the second step is the area of the management surface inside the drawbead of the blank holder and the outer contour of the blank.
在一实施例中,所述步骤二中参考点间距小于1000mm,单个压边圈的参考点数量为8~20个。In one embodiment, the distance between the reference points in the second step is less than 1000mm, and the number of reference points for a single blank holder is 8-20.
在一实施例中,所述步骤三中,所述目标点位置,为参考点位置加上对应的补偿量值。In one embodiment, in the third step, the position of the target point is the position of the reference point plus a corresponding compensation value.
在一实施例中,所述步骤三中所述补偿变形处理模型由补偿变形处理计算机辅助软件建立,所述目标点位置,为参考点位置加上对应的补偿量值。In one embodiment, the compensation deformation processing model in the third step is established by compensation deformation processing computer-aided software, and the target point position is the reference point position plus the corresponding compensation value.
在一实施例中,所述步骤三中,多点控制法,为点到点驱动方式,由参考点及其对应的目标点构成矢量,所有矢量构成矢量集,由该矢量集驱动曲面变形,制作补偿面。In one embodiment, in the
在一实施例中,所述步骤三中,多点控制法,为点线联合驱动方式,由补偿量值为零的参考点构成约束曲线,再由补偿量值不为零的参考点及其对应的目标点构成矢量,所有矢量构成矢量集,由约束曲线与矢量集驱动曲面变形,制作补偿面。In one embodiment, in the
在一实施例中,所述步骤三中,多点控制法,为面到面驱动方式,将所需补偿的曲面沿冲压方向投影形成投影面,用点到点驱动方式对投影面进行驱动变形形成目标面,采用投影面和目标面驱动曲面变形,制作补偿面。In one embodiment, in the step three, the multi-point control method is a surface-to-surface driving method, and the curved surface to be compensated is projected along the stamping direction to form a projection surface, and the projection surface is driven and deformed by a point-to-point driving method Form the target surface, use the projection surface and the target surface to drive the surface deformation, and make the compensation surface.
本发明提出的一种拉延模具压边圈挠度变形补偿方法,通过对压边圈挠度变形进行准确的分析与精确的补偿变形处理,使得拉延模具压边圈在精加工后未经人工研配的情况下就获取均匀的合模间隙,对降低模具制造成本、缩短模具制造周期具有明显的效果,能有效提高拉延模具压边圈型面的设计水平。A method for compensating the deflection and deformation of the blank holder of the drawing die proposed by the present invention, through accurate analysis of the deflection and deformation of the blank holder and accurate compensation and deformation processing, the blank holder of the drawing die can be processed without manual research after finishing. In the case of matching, a uniform clamping gap can be obtained, which has obvious effects on reducing the cost of mold manufacturing and shortening the mold manufacturing cycle, and can effectively improve the design level of the blank holder surface of the drawing mold.
本发明具体具有以下有益效果:The present invention specifically has the following beneficial effects:
1)提出拉延模压边圈挠度变形问题的有限元建模方法及参数设计,实现压边圈挠度变形的精准预判,相比于目前依靠个人经验的方法,提高了压边圈挠度变形分析的准确性与可靠性,且具有更好的技术推广性。1) The finite element modeling method and parameter design for the deflection and deformation of the binder ring of the drawing die are proposed to realize the accurate prediction of the deflection deformation of the binder ring. Compared with the current method relying on personal experience, the analysis of the deflection deformation of the binder ring is improved. Accuracy and reliability, and better technical promotion.
2)采用多点控制法(包含三种驱动方式)对压边圈挠度变形补偿曲面进行造型处理,实现对变形趋势的控制,提高了补偿数据的精度。2) The multi-point control method (including three driving modes) is used to shape the deflection deformation compensation surface of the blank holder to realize the control of the deformation trend and improve the accuracy of the compensation data.
附图说明Description of drawings
本发明上述的以及其他的特征、性质和优势将通过下面结合附图和实施例的描述而变得更加明显,在附图中相同的附图标记始终表示相同的特征,其中:The above and other features, properties and advantages of the present invention will become more apparent from the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals represent the same features throughout, wherein:
图1揭示了根据本发明一实施例的模型结构图;Fig. 1 discloses a model structure diagram according to an embodiment of the present invention;
图2揭示了根据本发明一实施例的压边圈挠度变形分析结果图;Fig. 2 discloses a diagram of analysis results of deflection and deformation of the blank holder according to an embodiment of the present invention;
图3揭示了根据本发明一实施例的压边圈挠度变形补偿方案;Fig. 3 discloses a compensation scheme for deflection and deformation of the blank holder according to an embodiment of the present invention;
图4揭示了根据本发明一实施例的补偿前与补偿后的曲面偏差分析。FIG. 4 discloses the analysis of surface deviation before compensation and after compensation according to an embodiment of the present invention.
图中各附图标记的含义如下:The meaning of each reference mark in the figure is as follows:
滑块101,上模102,压边圈103,台面104,顶棒105,下气垫106。
具体实施方式Detailed ways
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅用以解释发明,并不用于限定发明。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the invention, not to limit the invention.
本发明提出的一种针对拉延模具压边圈的挠度变形补偿方法,具体技术方案详述如下。A method for compensating the deflection and deformation of the blank holder of the drawing die proposed by the present invention, the specific technical solution is described in detail as follows.
步骤一、分析压边圈挠度变形。
本发明的技术方案采用有限元法实现压边圈挠度变形的准确分析,对补偿处理模型进行建模,对建模参数进行定义,具体建模参数定义方法如下:The technical solution of the present invention adopts the finite element method to realize accurate analysis of the deflection deformation of the blank holder, models the compensation processing model, and defines the modeling parameters. The specific modeling parameter definition method is as follows:
几何造型结构建模。采用计算机辅助软件(CAD软件,如Catia、UG等)对补偿处理模型进行建模。具体包括模具、压力机及相关的应力传递组件的造型结构建模。几何造型结构建模的具体参数以实际造型结构为基本依据,对非承受力组件做简化或删减处理。Geometric modeling of structures. Use computer-aided software (CAD software, such as Catia, UG, etc.) to model the compensation processing model. It specifically includes the modeling structure modeling of molds, presses and related stress transfer components. The specific parameters of the modeling of the geometric modeling structure are based on the actual modeling structure, and the non-bearing components are simplified or deleted.
组件材料性能。考虑模具及压力机等各组件的弹性变形行为,定义为弹性变形体,使用弹性模量和泊松比来定义组件材料的弹性变形性能。Component material properties. Considering the elastic deformation behavior of various components such as molds and presses, it is defined as an elastic deformation body, and the elastic modulus and Poisson's ratio are used to define the elastic deformation properties of the component materials.
对于组件材料是铸铁材料时,优选的弹性模量选用范围:105~155GPa;泊松比选范围:0.2~0.3。When the component material is cast iron, the preferred elastic modulus selection range: 105-155GPa; Poisson's ratio selection range: 0.2-0.3.
单元类型与网格尺寸划分。压边圈的挠度变形属于三维变形问题,需要采用实体单元类型。Element type and grid size division. The deflection deformation of the blank holder is a three-dimensional deformation problem, and the solid element type is required.
为获取较好的单元划分效果,优选的单元类型为Tet实体单元,网格大小控制范围为25~75mm。In order to obtain a better element division effect, the preferred element type is Tet solid element, and the grid size control range is 25-75mm.
模型装配。为每一个组件确立一个参考点,以此作为各组件装配的基准。在装配坐标系中,分别导入各组件及其参考点,然后在根据参考点的位置,确定各组件的相对位置关系,进行装配。Model assembly. Establish a reference point for each component as a basis for assembly of components. In the assembly coordinate system, each component and its reference point are respectively imported, and then the relative positional relationship of each component is determined according to the position of the reference point for assembly.
分析步及算法定义。将压边圈挠度变形过程视为准静态过程,求解格式采用静力隐式算法,以获取稳定可靠的计算结果。Analysis step and algorithm definition. The deflection and deformation process of the blank holder is regarded as a quasi-static process, and the solution format adopts the static implicit algorithm to obtain stable and reliable calculation results.
在一实施例中,整个分析步定义为1s。初始增量步长为0.001~0.01s,最大增量步长为0.05~0.2s,最小可接受的增量步长为10-7~10-5s。In one embodiment, the entire analysis step is defined as 1s. The initial incremental step is 0.001~0.01s, the largest incremental step is 0.05~0.2s, and the smallest acceptable incremental step is 10 -7 ~10 -5 s.
接触关系定义。所有的接触面之间根据其接触特点做定义处理。对于接触面之间有相对位移的,需要定义相对滑动时的摩擦力及正压力。而对于接触面之间几乎无相对位移的,可简化接触关系为连接关系进行定义,以提升模拟计算的效率。Contact definition. All contact surfaces are defined according to their contact characteristics. For the relative displacement between the contact surfaces, it is necessary to define the friction force and normal pressure during relative sliding. For those with almost no relative displacement between contact surfaces, the contact relationship can be simplified and defined as a connection relationship to improve the efficiency of simulation calculations.
边界条件定义。参考冲压工艺、模具结构、压力机结构等进行一致的设定。沿冲压方向(Z向)需要确保受力的平衡。载荷受力大小与工艺设计值一致。模型在X和Y方向则需要根据导向元件(如导板、导柱等)定义相应的边界约束条件,平衡侧向力,防止不合理的侧向变形。Definition of boundary conditions. Refer to the stamping process, mold structure, press structure, etc. for consistent settings. Along the stamping direction (Z direction), it is necessary to ensure the balance of the force. The magnitude of the load force is consistent with the process design value. In the X and Y directions, the model needs to define corresponding boundary constraint conditions according to the guide elements (such as guide plate, guide post, etc.) to balance the lateral force and prevent unreasonable lateral deformation.
步骤二、制定挠度变形补偿方案。Step 2: Formulate a deflection and deformation compensation plan.
在压边圈的关键位置选取参考点,作为后续型面变形处理的依据。Select a reference point at the key position of the blank holder as the basis for the subsequent surface deformation treatment.
根据挠度变形的分析结果,以挠度变形量最小的参考点为基准,依次计算其余参考点的相对挠度变形量,以此作为各参考点的补偿量值。所有参考点的位置信息及对应的补偿量值构成挠度变形补偿方案。According to the analysis results of deflection and deformation, the relative deflection and deformation of the remaining reference points are calculated sequentially based on the reference point with the smallest deflection and deformation, which is used as the compensation value of each reference point. The position information of all reference points and the corresponding compensation values constitute a deflection and deformation compensation scheme.
为正确反映压边圈的变形趋势,优先考虑在以下两类位置选区参考点:In order to correctly reflect the deformation trend of the blank holder, priority should be given to the following two types of location selection reference points:
1)压边圈拉延筋以内的管理面区域;1) The area of the management surface within the drawbead of the blank holder;
2)料片外轮廓。2) The outline of the sheet.
选取的参考点间距不宜过大,应该小于1000mm,单个压边圈参考点数量为8~20个。The selected reference point spacing should not be too large, it should be less than 1000mm, and the number of reference points for a single blankholder is 8 to 20.
步骤三、制作挠度变形补偿数据。
在补偿处理模型中,导入需要做补偿处理的压边圈型面以及所有的参考点。补偿处理模型由计算机辅助软件(CAD软件)建立。根据挠度变形补偿方案,生成每一个参考点相对应的目标点。目标点位置,为参考点位置加上对应的补偿量值。补偿公式为:In the compensation processing model, import the blankholder profile and all reference points that need to be compensated. The compensation treatment model is established by computer-aided software (CAD software). According to the deflection deformation compensation scheme, a target point corresponding to each reference point is generated. The position of the target point is the position of the reference point plus the corresponding compensation value. The compensation formula is:
其中,(xr,yr,zr)为参考点坐标,(xt,yt,zt)为目标点坐标,c为补偿量。Among them, (x r , y r , z r ) are the coordinates of the reference point, (x t , y t , z t ) are the coordinates of the target point, and c is the compensation amount.
根据参考点和目标点的坐标位置,采用多点控制法对压边圈作整体变形处理,确保各控制点满足方案要求、变形趋势如对称性、偏心度、梯度、基准点等与模拟分析结果一致、且曲面质量满足光顺要求。According to the coordinate positions of the reference point and the target point, the multi-point control method is used to process the overall deformation of the blank holder to ensure that each control point meets the program requirements, deformation trends such as symmetry, eccentricity, gradient, reference point, etc. and simulation analysis results Consistent, and the surface quality meets the smoothing requirements.
具体地,考虑到曲面造型的复杂程度及变形趋势的对称性等问题,多点控制法分别采用三种不同的驱动方式制作补偿面:Specifically, considering the complexity of the surface modeling and the symmetry of the deformation trend, the multi-point control method uses three different driving methods to make the compensation surface:
点到点驱动。对于曲面造型较为简单的情况,可直接采用点到点驱动的方式制作补偿面。由参考点及其对应的目标点构成矢量,所有矢量构成矢量集,由该矢量集驱动曲面变形,制作补偿面。Point to point drive. For the case where the surface modeling is relatively simple, the compensation surface can be made directly by point-to-point driving. The reference point and its corresponding target point form a vector, and all the vectors form a vector set, which drives the surface deformation to make a compensation surface.
点线联合驱动。对于曲面造型较为复杂,但变形趋势具有一定对称性的情况,可采用点线联合驱动的方式制作补偿面。由补偿量为零的参考点构成约束曲线,再由补偿量不为零的参考点及其对应的目标点构成矢量,所有矢量构成矢量集,由约束曲线与矢量集驱动曲面变形,制作补偿面。所有几何元素在构造时需满足对称性,以确保变形后的补偿曲面严格遵守对称性要求。Dot-line combined drive. For the case where the surface shape is complex but the deformation trend has a certain symmetry, the compensation surface can be made by joint driving of points and lines. Constraint curves are composed of reference points whose compensation amount is zero, and then vectors are formed by reference points whose compensation amount is not zero and their corresponding target points. All vectors form a vector set, and the surface deformation is driven by the constraint curve and vector set to make a compensation surface. . All geometric elements need to meet the symmetry during construction to ensure that the deformed compensation surface strictly obeys the symmetry requirements.
面到面驱动。对于曲面造型较为复杂,变形趋势不对称的情况,采用面到面驱动的方式制作补偿面。首先将所需补偿的曲面沿冲压方向投影,形成投影面,即参考面。然后采用上文提到的点到点驱动的方式对投影面(参考面)进行变形,形成目标面。最后采用参考面和目标面驱动曲面变形,制作补偿面。Face-to-face drive. For complex surface modeling and asymmetric deformation trends, the surface-to-surface driving method is used to make compensation surfaces. First, the surface to be compensated is projected along the stamping direction to form a projection surface, that is, a reference surface. Then, the projection surface (reference surface) is deformed by the point-to-point driving method mentioned above to form the target surface. Finally, the reference surface and the target surface are used to drive the deformation of the surface to make the compensation surface.
变形后的补偿数据,需要做面品检查和偏差分析,确保补偿量值正确、补偿数据面品质良好。For the deformed compensation data, surface quality inspection and deviation analysis are required to ensure that the compensation value is correct and the surface quality of the compensation data is good.
下面结合某车顶模具的具体实施例对本发明的补偿方法做进一步描述:The compensation method of the present invention is further described below in conjunction with the specific embodiment of a certain roof mold:
第一步,分析压边圈的挠度变形。The first step is to analyze the deflection deformation of the blank holder.
采用CAD软件,根据模具与压力机的造型结构进行几何建模,包括:滑块101,上模102,压边圈103,台面104,顶棒105,下气垫106等部件,具体结构如图1所示。CAD software is used to carry out geometric modeling according to the molding structure of the mold and press, including:
模具及压力机组件定义为弹性变形体,取弹性模量为130GPa,泊松比为0.25。The mold and press components are defined as elastically deformable bodies, the elastic modulus is taken as 130GPa, and the Poisson's ratio is 0.25.
单元类型采用Tet实体单元。网格尺寸为25~75mm。The unit type adopts Tet entity unit. The grid size is 25-75mm.
以模具下底面中心位置建立装配坐标系,定义各组件相对位置关系。The assembly coordinate system is established based on the center position of the bottom surface of the mold, and the relative positional relationship of each component is defined.
计算求解过程采用静力隐式算法。The calculation and solution process adopts the static implicit algorithm.
整个分析步定义为1s。初始增量步长0.01s,最大增量步长0.1s,最小可接受的增量步长:10-7s。The whole analysis step is defined as 1s. The initial incremental step size is 0.01s, the maximum incremental step size is 0.1s, and the smallest acceptable incremental step size is 10 -7 s.
各组件接触面之间根据相对滑动关系定义不同接触关系。Different contact relationships are defined between the contact surfaces of each component according to the relative sliding relationship.
边界条件根据实际工艺及模具与压机结构进行定义。各导向元件根据其导向方向定义相应的位移边界。The boundary conditions are defined according to the actual process and the structure of the mold and press. Each guiding element defines a corresponding displacement boundary according to its guiding direction.
图2揭示了根据本发明一实施例的压边圈挠度变形分析结果图,如图2所示,为该压边圈挠度变形的分析结果,不同的灰度颜色深浅代表不同的挠度变形值。Fig. 2 discloses a diagram of analysis results of deflection and deformation of the binder ring according to an embodiment of the present invention. As shown in Fig. 2, it is the analysis result of the deflection and deformation of the binder ring, and different shades of gray color represent different values of deflection and deformation.
第二步,制定挠度变形补偿方案。The second step is to formulate a deflection and deformation compensation plan.
图3揭示了根据本发明一实施例的压边圈挠度变形补偿方案,如图3所示,在压边圈以内管里面区域选取8个参考点,作为后续型面变形处理的依据。Fig. 3 discloses a compensation scheme for deflection and deformation of the blankholder according to an embodiment of the present invention. As shown in Fig. 3, 8 reference points are selected in the area inside the pipe inside the blankholder as the basis for subsequent surface deformation processing.
根据图2的压边圈的挠度变形的分析结果,分别记录8个参考点的挠度变形量,如图3中编号为1~8的参考点,以挠度变形量最小的点为零位,在图3中以编号1,3,5,7的参考点为零位,依次计算其余各参考点的相对挠度变形量,作为各参考点的补偿量值。According to the analysis results of the deflection deformation of the blank holder in Fig. 2, record the deflection deformation of 8 reference points respectively, as shown in Fig. In Figure 3, the reference points numbered 1, 3, 5, and 7 are taken as the zero position, and the relative deflection and deformation of the remaining reference points are calculated in turn as the compensation value of each reference point.
如图3所示,编号1~8的8个参考点的位置信息及对应补偿量值构成该车顶模具压边圈挠度变形补偿方案。As shown in Figure 3, the position information of the eight reference points numbered 1 to 8 and the corresponding compensation values constitute the compensation scheme for the deflection deformation of the blank holder of the roof mold.
第三步,制作挠度变形补偿数据。The third step is to make deflection and deformation compensation data.
在CAD软件中,导入需要做补偿处理的压边圈型面以及所有的参考点。对每一个参考点,根据补偿方案,生成各自相应的目标点。In the CAD software, import the blankholder profile and all reference points that need to be compensated. For each reference point, corresponding target points are generated according to the compensation scheme.
考虑到该曲面造型较为简单,直接采用点到点驱动的方式,驱动压边圈作整体变形处理。Considering that the shape of the curved surface is relatively simple, a point-to-point driving method is directly adopted to drive the blank holder for overall deformation processing.
图4揭示了根据本发明一实施例的补偿前与补偿后的曲面偏差分析,如图4所示,不同的灰度颜色深浅代表不同的偏差量,此偏差量即为最终的实际补偿量。FIG. 4 reveals the deviation analysis of the surface before compensation and after compensation according to an embodiment of the present invention. As shown in FIG. 4 , different shades of gray represent different deviations, which are the final actual compensations.
图2和图4中采用灰度颜色对相应的变量(挠度变形值、偏差量)进行了表征,由于这两组变量存在渐变和不规则变化的情况,采用不同的灰度颜色深浅来表示变量的变化情况,更加有利于直观与准确的理解。In Figure 2 and Figure 4, grayscale colors are used to characterize the corresponding variables (deflection deformation value, deviation). Since these two groups of variables have gradual changes and irregular changes, different grayscale color depths are used to represent variables. It is more conducive to intuitive and accurate understanding.
本发明提出的一种拉延模具压边圈挠度变形补偿方法,通过对压边圈挠度变形进行准确的分析与精确的补偿变形处理,使得拉延模具压边圈在精加工后未经研配的情况下就获取均匀的合模间隙,对降低模具制造成本、缩短模具制造周期具有明显的效果,能有效提高拉延模具压边圈型面的设计水平。A method for compensating the deflection and deformation of the blank holder of the drawing die proposed by the present invention, through accurate analysis of the deflection and deformation of the blank holder and accurate compensation and deformation processing, the blank holder of the drawing die is not researched and matched after finishing Obtaining a uniform clamping gap under certain conditions has obvious effects on reducing mold manufacturing costs and shortening the mold manufacturing cycle, and can effectively improve the design level of the blank holder surface of the drawing die.
本发明具体具有以下有益效果:The present invention specifically has the following beneficial effects:
1)提出拉延模压边圈挠度变形问题的有限元建模方法及参数设计,实现压边圈挠度变形的精准预判,相比于目前依靠个人经验的方法,提高了压边圈挠度变形分析的准确性与可靠性,且具有更好的技术推广性。1) The finite element modeling method and parameter design for the deflection and deformation of the binder ring of the drawing die are proposed to realize the accurate prediction of the deflection deformation of the binder ring. Compared with the current method relying on personal experience, the analysis of the deflection deformation of the binder ring is improved. Accuracy and reliability, and better technical promotion.
2)采用多点控制法(包含三种驱动方式)对压边圈挠度变形补偿曲面进行造型处理,实现对变形趋势的控制,提高了补偿数据的精度。2) The multi-point control method (including three driving modes) is used to shape the deflection deformation compensation surface of the blank holder to realize the control of the deformation trend and improve the accuracy of the compensation data.
尽管为使解释简单化将上述方法图示并描述为一系列动作,但是应理解并领会,这些方法不受动作的次序所限,因为根据一个或多个实施例,一些动作可按不同次序发生和/或与来自本文中图示和描述或本文中未图示和描述但本领域技术人员可以理解的其他动作并发地发生。Although the methods described above are illustrated and described as a series of acts for simplicity of explanation, it is to be understood and appreciated that the methodologies are not limited by the order of the acts, as some acts may occur in a different order according to one or more embodiments And/or concurrently with other actions from those illustrated and described herein or not illustrated and described herein but can be understood by those skilled in the art.
如本申请和权利要求书中所示,除非上下文明确提示例外情形,“一”、“一个”、“一种”和/或“该”等词并非特指单数,也可包括复数。一般说来,术语“包括”与“包含”仅提示包括已明确标识的步骤和元素,而这些步骤和元素不构成一个排它性的罗列,方法或者设备也可能包含其他的步骤或元素。As indicated in this application and claims, the terms "a", "an", "an" and/or "the" do not refer to the singular and may include the plural unless the context clearly indicates an exception. Generally speaking, the terms "comprising" and "comprising" only suggest the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also contain other steps or elements.
上述实施例是提供给熟悉本领域内的人员来实现或使用本发明的,熟悉本领域的人员可在不脱离本发明的发明思想的情况下,对上述实施例做出种种修改或变化,因而本发明的保护范围并不被上述实施例所限,而应该是符合权利要求书提到的创新性特征的最大范围。The above-mentioned embodiments are provided for those who are familiar with the field to implement or use the present invention, and those who are familiar with the art can make various modifications or changes to the above-mentioned embodiments without departing from the inventive idea of the present invention. The scope of protection of the present invention is not limited by the above-mentioned embodiments, but should be the maximum scope consistent with the innovative features mentioned in the claims.
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