Numerical control telescopic cushion with error compensation function

Abstract

The invention discloses a numerical control telescopic cushion with an error compensation function. The numerical control telescopic cushion comprises a telescopic cushion base body 12 and fluid cylinders 11 distributed on the telescopic cushion base body 12 in an array mode. The array-mode fluid cylinders are connected to a fluid source in an overall communication or partitioned communication mode. In a pressure machine, the numerical control telescopic cushion is arranged between a top rod and a top crown, and the bottom of the top rod is erected on a supporting and ejecting part for the fluid cylinders of the numerical control telescopic cushion. By controlling pressure of working media of the fluid cylinders, output force of the top rod can be accurately controlled, and therefore different magnitudes of edge pressing force is provided, and the process requirement for stamping materials which are complex in shape and can hardly be formed into a shape is met. In addition, the fluid cylinder arrays in all areas are communicated with one another and are equal in pressure, the length error of the top rod can be automatically compensated for through the change of strokes of the fluid cylinders, the rejection rate of stamping parts can be decreased, and the requirement of the pressure machine for the length error of the top rod is lowered.

Description

technical field [0001] The invention relates to a numerically controlled stretch pad with error compensation function, and mainly relates to the blank-holding force control technology in the stamping process of workpieces. Background technique [0002] In order to meet the requirements of complex shape parts and material diversification for the blank holder force in the stretching process, the new type of press uses a large number of CNC stretching pads. The CNC stretching pad is arranged in the press table, and the specified force is applied to the sheet support through the movable ejector rod. In the process of stretching, the output force of the ejector rod can be changed; at different positions of the plate support, the output force of the ejector rod can also be changed according to the set value, so as to meet the requirements of the stretching process for blank holder force. There are two types of CNC stretching pads widely used at present, one is a pure hydraulic CN...

AI Technical Summary

Problems solved by technology

In this scheme, the structure of the CNC stretching pad is very complicated, the technical requirements for maintenance operators are very high, and the manufacturing cost and maintenance cost are very high

[0005] The problem that prior art exists is: press machine of prior art, refer to figure 1 and figure 2 As shown, the entire basic stretching pad 3 is a huge cylinder, the top of the stretching pad 3 is connected to the crown 5, and the ejector rod 2 is in direct contact with the crown 5 of the press

When the ejector pins are of different lengths, the short ejector pins provide less force for the plate support, and the blank holder force provided by the plate support here is smaller, and more metal flows into the mold, and the processed parts are easy to wrinkle and produce waste products

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