Archive for December, 2016

Stamping equipment is generally used to carry out the brake

Precision Punch positioning accuracy of the detection is very important because it is that the detection of the punch of the moving parts in the CNC system under the control of the movement can achieve the accuracy, so by measuring the positioning accuracy of numerical precision punch can determine the punch After the automatic operation can achieve the best workpiece machining accuracy. It must be emphasized here, the current positioning accuracy of the test is a rapid, positioning measurement, for some feed system stiffness is not very good CNC punch, using different feed speed positioning, will get different positioning accuracy. In addition, the positioning accuracy of the detection results and the ambient temperature and the axis of the running state, most of today’s CNC punch press through the semi-closed-loop system, position detection components are mostly installed in the drive motor, the ball screw thermal elongation is not yet effective Of the identification measures. Therefore, it is not surprising that, when the positioning accuracy is measured, it is possible to generate an error of 0.01 to 0.02 mm within a 1-m stroke after a rapid round trip. This is because the screw quickly moves several times, the surface temperature may rise 0.5 ~ 1 ℃, resulting in thermal expansion of the screw caused. The thermal elongation of the error, some punch will use pre-stretching (preload) method to reduce the impact. The repeatable positioning accuracy of each axis is the most basic accuracy index of the axis, which reflects the stability of the movement accuracy of the axis, the accuracy of the punch is usually can not guarantee the stability of production. Nowadays, due to the increasing number of CNC system functions tube punching machine, systematic error such as pitch accumulation error and backlash error can be compensated for each coordinate motion precision, only random error can not be compensated, and repeated positioning precision reflects To the drive mechanism of the integrated random error, it is no way to use the CNC compensation system to correct, when it found that poor, only the feed chain to fine-tune correction. Therefore, the purchase of punch presses should give priority to choose and repeat the high positioning accuracy of the punch. Precision punching in the use of different stamping occasions with different stamping die busbar machine, if used for stretching the occasion will need to use the drawing die, and drawing die has a more special requirements, the use of punch processing required processing The material must have a blank holder and the product is ejected. When the stretch processing to be a large amount of tension is required in the bottom of the punch mold to install a buffer device to complete the pressure side and the top of the action steel hole punch machine, and this device for the buffer in the press industry is called mold pad. At present, the mold pad used in the stretching occasion is basically the oil mold pad, but the mold pad has a very significant shortcomings, mainly in three aspects: 1, due to the use of oil pressure, its parts manufacturing precision requirements are relatively high, resulting in relatively high cost; 2, the use of relatively high cost, due to the existing stamping equipment generally use pneumatic clutch brake, the factory only gas source, the use of existing mold pad requires a separate set of hydraulic booster equipment; 3, the hydraulic seal requirements are relatively high, the probability of oil leakage is relatively large, dirty working environment. To fundamentally solve this problem, precision machinery for the production of precision punch press design, the production of a pneumatic die pad device, instead of using oil hydraulic oil, without a separate source, can share the gas source with the punch, with manufacturing Cost, not oil, fast response, easy maintenance, the advantages of clean work environment.