Method of bending a workpiece including setting a bending process, and preparing bending data

• US 5,029,462 A
• Filed: 08/04/1989
• Issued: 07/09/1991
• Est. Priority Date: 08/05/1988
• Status: Expired due to Term

• Current Assignee: Amada Company Limited
• Original Assignee: Amada Company Limited
• Inventors: Onoue, Takashi, Wakahara, Takashi, Nagasawa, Tadahiko
• Primary Examiner(s): Jones, David
• Application Number:
  US07/389,798
• Time in Patent Office: 704 Days
• Field of Search: 72/481, 72/389, 72/379.2, 72/363
• US Class Current: 72/379.2
• CPC Class Codes: B21D 5/02 on press brakes without making use of clamping means

Abstract

A method for bending a workpiece into a developed shape between an upper and lower die. The method includes setting up a bending sequence for bending the workpiece from a unfinished to a finished state. The method is accomplished by preparing data for a workpiece shape, i.e. assigning bending points on the workpiece; determining consecutive striking points and bending points; determining preparatory bending points to avoid interference between the workpiece and dies; assigning identification codes for the preparatory bending points, and bending the workpiece.

Claims

1. A method of bending a workpiece into a developed shape between an upper die and a lower die including a method of setting up a bending process sequence for bending the workpiece comprising the steps of:

preparing data for a workpiece shape, the data including numbers assigned to a series of bending points, starting from one side of the developed shape of the workpiece, and said data further including a bending length and a bending angle for each of the bending points;

determining consecutive striking points and bending points in the process sequence by using the said prepared workpiece shape data;

determining bending points where a preparatory bending is needed to avoid interference between the workpiece and one of the dies during the process sequence;

assigning identification codes and shallow bending angles for the preparatory bendings to the bending points determined above; and

bending the workpiece according to the said bending process sequence.

2. The method of claim 1, wherein the preparatory bending points determining step includes the sub-steps of:

simulating the bending process for the workpiece based on the data from the consecutive striking points and bending points determining step;

checking for an interference between the workpiece and at least one of the upper or lower dies; and

when an interference is detected, determining preparatory bending points at which the preparatory bending is required to avoid the interference.

3. A method of bending a workpiece between an upper die and a lower die which are processed for bending in a bending machine according to a bending sequence, including a method of preparing bending data comprising the steps of:

checking for interference between the workpiece and the dies; and

when an interference is detected, preparing data for an additional processing of at least one of the dies corresponding to the amount of interference;

processing said at least one of the dies in accordance with said data prepared when an interference is detected;

preparing the bending data assuming that the die has been additionally processed; and

bending the workpiece in accordance with the prepared bending data,

preparing data for a workpiece shape, the data including numbers assigned to a series of bending points, starting from one side of the developed shape of the workpiece, and said data further including a bending length and a bending angle for each of the bending points;

determining consecutive striking points and bending points in the process sequence by using the said prepared workpiece shape data;

determining bending points where a preparatory bending is needed to avoid interference between the workpiece and one of the dies during the process sequence;

assigning identification codes and shallow bending angles for the preparatory bendings to the bending points determined above; and

bending the workpiece according to the said bending process sequence.

4. The method of claim 3, further comprising the step of selecting the best bending condition, where the amount of interference is minimum, among a plurality of bending conditions, wherein the bending condition is determined by data for the die to be used and the bending sequence.