Views: 3915 Author: Site Editor Publish Time: 2022-04-27 Origin: Site
The accuracy helps buyers to judge the performance of a press brake. It may be familiar to old users, but it may be confusing for some new buyers or users who are going to buy a press brake. This article ZFY Company Share with you the following methods of measuring the accuracy of the press brake, hoping to help you who are buying the machine in the future.
Code | Item | Methods | Range (mm) | Remark |
G2 | The horizontal support on the slider that is attached to the upper mold faces the same height of the worktable at both A and B |
A and B are at the center line of the oil cylinder | 0.02 | |
G3 | The perpendicularity of the slider travel to the worktable |
| 0.10/100 | |
G4 | Rear positioning accuracy of X-axis | Take five positions within the X-axis travel range at equal intervals, and randomly select three target positions at each position for inspection. The actuator feeds {with special provisions} to the above target positions in both directions, and measure the difference between the theoretical distance and the actual distance of each target position. The error is calculated based on the larger value of each target | Nominal force ≤2500KN
Nominal force >2500KN 0.05 | X1: |
X2: | ||||
G5 | Repetitive positioning accuracy of X-axis | Take five positions within the X-axis travel range at equal intervals, and randomly select three target positions at each position for inspection. The actuator measures the theoretical distance and actual deviation value of each target position by two-way feeding (according to the regulations when there are special regulations) to the above target positions, with the error calculated as the larger value of each target position. | X1: | |
X2: |
G6 | Positioning accuracy of Y-axis | Randomly select five target positions within 10% of the arbitrary adjustable travel of the Y-axis for inspection. The actuator feeds them in both directions (if there are special regulations, they are given as required) to the above target positions, and then measure the theoretical distance and actual distance difference between each target position. The error is calculated as the larger value of each target position. | 0.02 | Y1 |
Y 2 | ||||
G7 | Repetitive positioning accuracy of Y-axis | Randomly select five target positions within 10% of the arbitrary adjustable travel of the Y-axis for inspection. The actuator feeds to the above target positions in both directions (if there are special regulations, feed according to regulations), and measures the target positions three times. The error is calculated as the larger value of each target position. | 0.01 | Y 1 |
Y 2 | ||||
G8 | Positioning accuracy of Z-axis | Randomly select five target positions within the arbitrary travel range of the Z-axis for inspection. The actuator feeds them in both directions (if there are special regulations, feed them according to regulations) to the above target positions, and measure the difference between the theoretical distance and the actual distance of each target position. The error is calculated based on the larger value of each target position. During actual measurement, the midpoint of the actual detection range is used as the reference reference point for each target position. | 1 | Z 1 |
Z 2 | ||||
G9 | Repetitive positioning accuracy of Z-axis | Randomly select five target positions within the arbitrary travel range of the Z-axis for inspection. The actuator feeds in both directions (if there are special regulations, feed according to the regulations) to the above target positions, and measure the relative differences of three measurements for each target position. The error is calculated as the larger value of each target position. | 0.5 | Z 1 |
Z 2 | ||||
G10 | Positioning accuracy of R-axis | Randomly select five target positions within the arbitrary travel range of the R-axis for inspection. The actuator feeds in both directions (if there are special regulations, feed according to the regulations) to the above target positions, and respectively measure the larger relative difference between the three measurements of each target position. The error is calculated as the larger value of each target position. During actual measurement, the midpoint of the actual detection range is used as the reference reference point for each target location. | 0.5 | R 1 |
R 2 | ||||
G11 | Repetitive positioning accuracy of the R-axis | Randomly select five target positions within the arbitrary travel range of the R-axis for inspection. The actuator feeds them in both directions (if there are special regulations, feed them according to regulations) to the above target positions, and measure the larger relative differences of each target position three times. The error is calculated as the larger value of each target position. | 0.2 | R 1 |
R 2 |
G12 | Positioning accuracy of V-axis (crowning system) | Randomly select five target positions within the arbitrary travel range of the V-axis for inspection. The actuator feeds them in both directions (if there are special regulations, feed them according to regulations) to the above target positions, and measure the difference between the theoretical distance and the actual distance of each target position. The error is calculated based on the larger value of each target position. During actual measurement, the midpoint of the actual detection range is used as the reference reference point for each target position. | 0.05 | |
G13 | Repetitive positioning accuracy of the V-axis (crowning system) |
| 0.3 | |
P1 | Bending angle of test piece |
| Normal force ≤2200KN ±25’/L
| |
2200〈Normal force≤4000KN ±35’/L | ||||
Normal force＜4000KN ±50’/L | ||||
P2 | Bending rightness of test piece |
| Normal force≤2200KN 0.30/1000
| |
2200〈Normal force≤4000KN 0.35/1000 | ||||
Normal force＞4000KN 0.4/1000 |
Q: The experience and techniques of the operators affect the bending accuracy. The workers exert too much or too little force when pushing the blocking material, resulting in positioning gaps or plate bending that affects the bending dimensional accuracy; The worker's bending speed is not synchronized with the machine speed, which can cause the bending angle to be too large or too small.
A: Bending workers should be skilled and experienced, and do not frequently change operators.
Q: The bending coefficient affects the accuracy of the bending dimension, and the bending dimension of the sheet metal is already determined when making a flat drawing. In a developed drawing, the bending coefficient is a key factor in determining the bending size. The inaccurate calculation of unfolded drawings directly affects the dimensional accuracy of sheet metal bending.
A: Sheet metal technologists are familiar with the principle of sheet metal unfolding, and can accurately determine the accurate bending coefficient based on theory and practice.
Q: Material quality affects the accuracy of bending dimensions, and material thickness directly affects the bending coefficient, which affects the bending accuracy.
A: Purchase from large steel mills and strengthen thickness and dimension inspection. Different mechanical properties of materials can also affect the accuracy of bending dimensions, such as steel plate or soft or hard, resulting in different tensile amounts. Solution: Try to dry a sheet metal product with the same batch of steel plates, and check the bending coefficient of the same batch of steel plates.
