Metal deforming – With indication of condition or position of work – product,... – Including deformation by simple bending
Patent
1998-06-02
2000-08-08
Tolan, Ed
Metal deforming
With indication of condition or position of work, product,...
Including deformation by simple bending
72 162, 72 173, 723893, 723792, B21C 5100
Patent
active
06098435&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and system for determining a bending order to achieve high bending accuracy in producing a plurality of bends in a workpiece, the method and system being well adapted for use in a bending machine in which a correction value for a die driving amount with respect to a first bend is obtained based on measurements of the bend angle thereof and a correction value for a die driving amount with respect to a second bend is calculated from the correction value for the first bend.
BACKGROUND ART
A known bending machine such as press brakes controls the driving amount of a movable die with an NC device according to various kinds of input information to bend a sheet-like workpiece. However, such die driving amount control cannot always avoid errors in bend angle because of variations in the thickness and properties of workpieces to be bent and in processing conditions. One attempt to solve this problem is designed such that the bend angle of the workpiece is measured during the bending process and the driving amount for the die is corrected based on the in-process measurements thereby to ensure high bending accuracy.
When forming a workpiece into particular shapes, bending machines equipped with such a bend angle measuring means are unable to perform bend angle measurement or encounters difficulties in measurement. In these cases, the bending machines fail in eliminating errors in bend angle.
With a view to overcoming the foregoing drawback, the applicant of the present invention has proposed an automatic die driving amount correction method in Japanese Patent Unexamined Publication No. 7-314043 (1995), according to which a correction value for a die driving amount with respect to a first bend is obtained based on measurements of the bend angle thereof and a correction value for a die driving amount with respect to a second bend is calculated from the correction value for the first bend. This correction method makes it possible to ensure high bending accuracy even if the workpiece has bends the angles of which are difficult or impossible to measure and eliminates the need for conducting angle measurement each time when a bend is produced so that significant savings in processing time can be achieved.
The above automatic die driving amount correction method reveals a problem, that is, its inapplicability to some bends if bending order is not appropriately determined when producing a plurality of bends in a workpiece. In addition, since the bending accuracy of the second bend varies depending on the degree of the correlation between the first and second bends in terms of their processing factors, the highest possible accuracy cannot be achieved with some bending orders.
SUMMARY OF THE INVENTION
The invention is directed to overcoming the above problem and one of the objects of the invention is therefore to provide a method and system for determining a bending order to achieve bending accuracy as high as possible in forming a plurality of bends with a bending machine in which if one of the bends has an angle difficult or impossible to measure, a correction amount for this bend is calculated from a correction amount for another bend which has been obtained based on bend angle measurements. Herein, the bend (i.e., first bend) whose correction value for a die driving amount is obtained from measurements of its bend angle is called "reference bend", while the bend (i.e., second bend) whose correction value is calculated from the correction value of the reference bend is called "objective bend".
According to the invention, there is provided a bending order determining method for a bending machine wherein a correction value for a die driving amount with respect to a reference bend is obtained based on measurements of the bend angle of the reference bend and a correction value for a die driving amount with respect to an objective bend is calculated from the correction value for the reference bend, in producing a plurality of bends in a workpiece, of bending orders
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patent: 5483750 (1996-01-01), Ooenaki et al.
patent: 5587914 (1996-12-01), Conradson et al.
patent: 5704238 (1998-01-01), Tokai
patent: 5812406 (1998-09-01), Matsumoto et al.
patent: 5813263 (1998-09-01), Tokai
Komatsu Industries Corporation
Komatsu Ltd.
Tolan Ed
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