The accuracy of the gantry punch directly affects the accuracy of the stamping products and the service life of the die. Therefore, when choosing the punch, the accuracy of the gantry punch can not be ignored

1、 Parallelism: put the slide seat in the lower position, then place the pointer table on the bed, and then move the left and right directions and the front and rear directions to determine the large error.

2、 Integrity: take the ruler (calibrated and the width can support the steel ball of the pointer gauge) and place it in the center and both ends of the bed. Measure the big error in the left and right direction and the front and rear direction with the pointer meter.

3、 The angle between the handle hole of die (head) and the bottom surface of sliding seat is based on the hole of die (head) handle. The pointer table is placed on the bottom surface of sliding seat to rotate, so as to determine the large error in left and right direction and front and rear direction.

4、 At the positive (straight) angle, place a square ruler at the center of the bed table, and place the pointer table on the sliding seat to make the sliding seat move up and down, and determine its big error.

5、 The total clearance is to place the jack in the center of the gantry punch, the sliding seat is at the bottom dead point, the pointer gauge is placed on the bottom of the sliding seat, and the jack is pressurized to the standard pressure to make the sliding seat move upward to determine its large error.

The brake mode of gantry punch is pneumatic clutch, which is mainly ram power, which is generated by the motor driving flywheel and flywheel driving crankshaft. Compared with the old punch, the gantry punch has higher performance; The precision of the gantry punch is higher than that of the old one; The upper and lower die is more convenient than the old punch. Speed, gantry press faster than; Gantry punch has cylinder, need to use gas, conservative is not used; Price, the price of Longmen punch is higher than that of the old punch. The multi-step gantry press is made up of various mechanisms, so special attention is required. Before the work starts, check the correctness of all mechanism action of the punch, and check whether the on and brake clutch are faulty. All individual lubrication points shall be lubricated and the operation of the centralized lubricating oil pump shall be checked. When gantry punch is selected by Longmen press factory according to forming method, forming speed and production, these characteristics of gantry punch are considered. According to the different driving mechanism of numerical control system, mechanical gantry punch includes: the common crankshaft gantry punch is used in stamping, elbow bar gantry punch with slow speed near the lower dead point, and the connecting rod gantry punch with high torque ability which starts to slow down at a high position above the lower dead point.