TH77420B - Method for assessing the feasibility of sheared edge shaping. - Google Patents

Abstract

1 page of the number 1 page summary of the invention The aim of this invention is to provide a technique for assessing feasibility. Of edge-forming materials to be machined more accurately after pre-forming by testing hole expansion for sheet metal after pre-forming. A piece of information Equivalent stress at the deformation limit relative to the gradient stress is treated. This is obtained by changing the stress gradient at the shear edge. And the relationship between Equivalent stress at the stretched flange deformation limit with the gradient strain is obtained Obtaining from that particular piece of information And the equivalent amount of stress at previous deformation, the possibility of forming a sheared edge for sheet metal, which has given the replacement The preceding shape, performed by pre-forming, is evaluated from the L-forming limit and R-forming area from the acquired relationship.

Claims (6)

Disclaimer (all) which will not appear on the announcement page: EDIT 27/11/2018 1. Evaluation method for assessing the possibility of sheared edge forming by Press forming for sheet metal, which has previously been deformed, is performed by pre-forming where the assembly method is included. Obtaining the deformation limit at sheared edges by extending test Hole for sheet metal after pre-forming The expression of the deformation limit obtained at the sheared edge by the equivalent stress load at the deformation limit. And obtaining In which a number of pieces of information with different stress gradients are those that contain quantitative Equivalent stress at the deformation limit obtained by the calibration hole test. With gradient stress in the radial direction at the sheared edge Obtaining a relationship of equivalent stress at the stretch flange deformation limit with the strain gradient based on the equivalent stress load. At the previous deformation And that amount of information is where the amount of stress is equivalent to It is to act on sheet metal by pre-forming to the equivalent stress load at the previous deformation and the sum of the equivalent stress load at the previous deformation and the amount. The equivalent stress at the deformation limit in sheet metal after pre-forming is stress. Equivalent at the stretch flange deformation limit and designation, specifying the machinable area of the sheared edge from the acquired relationship, and assessing the feasibility of forming the machined edge for sheet metal. Which has given the replacement The previous shape is done by pre-forming. ----------------------------------------------- Page 1 of 4 pages. 1. Evaluation method for assessing the feasibility of machined edges by Press forming for sheet metal, which has previously been deformed, is performed by pre-forming where the assembly method is included. Obtaining the deformation limit at sheared edges by extending test Hole for sheet metal after pre-forming The expression of the deformation limit obtained at the sheared edge by the equivalent stress load at the deformation limit. And obtaining In which a number of pieces of information with different stress gradients are those that contain quantitative Equivalent stress at the deformation limit obtained by the calibration hole test. With gradient stress in the radial direction at the sheared edge Obtaining a relationship of equivalent stress at the stretch flange deformation limit with the strain gradient based on the equivalent stress load. At the previous deformation And that amount of information, where the amount of stress is equivalent to It is applied to sheet metal by pre-forming to the equivalent stress load at the previous deformation and the sum of the equivalent stress load at the previous deformation and the amount. The equivalent stress at the deformation limit in sheet metal after pre-forming is stress. Equivalent at the stretch flange deformation limit and designation, specifying the machinable area of the sheared edge from the acquired relationship, and assessing the feasibility of forming the machined edge for sheet metal. Which has given the replacement The previous shape is done by pre-forming. 2. Evaluation method for assessing the feasibility of sheared edge shaping by Press forming for sheet metal, which has previously been deformed, is performed by pre-forming where the assembly method is included. Obtaining the deformation limit at sheared edges by extending test Hole for sheet metal after pre-forming The expression of the deformation limit obtained at the sheared edge by the equivalent stress load at the deformation limit. And obtaining In which a certain piece of information Where each piece of information contains the equivalent amount of stress at The deformation limit was obtained by the hole enlargement test in relation to the 2-page gradient of the number of 4 pages stressed in the radial direction at the sheared edge. In which one piece of information includes two pieces Or more of the data that one contains the less stress gradient than the stress gradient. Pre-set standards And two or more pieces of the second containing The higher the strain, the higher the standard strain. Obtaining the first relationship that is the equivalent of stress correlation that Stretched flange deformation limit with gradient strain based on quantity Equivalent stress at the previous deformation And two or more pieces of data one where the equivalent amount of stress achieved on sheet metal by pre-forming is defined as The equivalent amount of stress at the previous deformation. And the sum of the amount of stress Equivalent at the previous deformation and the equivalent amount of stress at the deformation limit in Sheet metal after pre-forming is defined as the equivalent stress at the transition limit. Stretched flange shape Obtaining a second relationship that is equivalent to the stress limit Stretched flange deformation with strain gradient based on stress load. Equivalent to the previous deformation And two or more pieces of information two Estimation of the stress gradient that will be produced at the target sheared edge. By pressing forming and determining the first forming area of the sheared edge by the first relation when the estimated stress gradient is less than the standard stress gradient. And assessment Possibility of forming the edges to be machined by pressing forging and defining the forming area. Get the second of the edge slashed by the second correlation When the gradient stress estimated that Equal to or greater than the standard strain gradient And assessment of the possibility of forming Edges that are machined by pressing forging 3. Methods for assessing the possibility of sheared edge shaping according to claim 2, where the standard stress gradient was chosen from a range of 0.03 or more and 0.06 or less. Page 3 of 4 pages 4. Evaluation method for assessing the feasibility of machined edges by Press forming for sheet metal, which has previously been deformed, is performed by pre-forming where the assembly method is included. Obtaining the deformation limit at sheared edges by extending test Hole for sheet metal without pre-forming The expression of the deformation limit obtained at the sheared edge by the equivalent stress load at the deformation limit. And obtaining Where some chunks of information have different stress gradient Which each piece of information consists of The equivalent amount of stress at the deformation limit obtained by the dilation test. Compared to the gradient, radial stresses at the sheared edge in non-metallic sheet Pre-forming The acquisition of non-preformed relationships Which is the relationship of quantity Equivalent stress at the deformation limit without pre-forming to the strain gradient In the non-preformed sheet metal From that amount of information Adding the conversion factor for conversion of the equivalent stress load at the Transforms the acquired shape in the non-preformed relationship to the equivalent of the stress. Equivalent at the stretched flange deformation limit with the equivalent stress load at the Change shape And achieving a pre-formed relationship Which is the relationship of Equivalent stress at the stretched flange deformation limit with gradient strain at which the equivalent amount of stress achieved on sheet metal by pre-machining is defined as The equivalent amount of stress at the previous deformation. And the sum of the amount of stress Equivalent at the previous deformation and the equivalent amount of stress at the deformation limit in Sheet metal after pre-forming is defined as the equivalent stress at the transition limit. The stretched flange shape and designation specify the forming area of the edges machined from the molded relationship. Advance acquired And evaluation of the feasibility of sheared edge forming for sheet metal Which gave the previous deformation done by pre-forging 5. Method for assessing the likelihood of sheared edge forming according to claim 4, where page 4 of the number 4, as a conversion value. The conversion value in the event that is equal to or greater than the gradient The preset standard is set to a value greater than the conversion value in case of That is less than the standard stress gradient. 6. Method for assessing the possibility of forming a sheared edge according to claim 4 or 5, where, as a conversion value, In the event of less than the pre-set standard strain gradient, the value selected was from a range of -0.5 times or greater and 0.5 times or less of the equivalent strain amount at the previous deformation at the edge. Get the slash to get Evaluation is assigned as a conversion value. And in case of equal or greater Gradient Stressed standard The values that were selected were from a range of 0.5 times or greater and 1.0 times or less of the equivalent stress load at the previous deformation at the sheared edge to be treated. Evaluation is assigned as a conversion value.