1. First determine the pressure needs
In the conversion process, the first step is to know the pressure requirements of the existing mold. If you know the pressure required to complete the operation, you can directly use the corresponding tonnage nitrogen gas spring. If you don't know the total pressure you need, you can find it by calculating the total pressure provided by the original linear spring in the mold. At the same time, you must know whether the required pressure is the initial pressure (pre-pressure) or the final pressure (full stroke). Once you know this, you can get the total pressure demand you need. The common way to find out the pressure of a linear spring is to consult the manufacturer's product pressure chart. Through the chart, you can know the specification, color, preload and stroke of the linear spring in the mold. You can also use a pressure gauge to get the spring pressure. When you get the pressure of a linear spring in the mold, multiply it by the number of springs to get the total pressure.
For example: 10 0.75" (19mm) × 5" (127mm) diameter coil springs are supplied with 80 pounds each. (0.3kN) initial force is pre-installed with 0.75" (19mm). Total initial force = 80 pounds (0.36kN) × 10 = 800 pounds. (3.6kN) force
2. Calculate the number of nitrogen gas springs
First of all, the diameter of the nitrogen gas spring must match the diameter of the linear spring. The nitrogen gas spring provides all diameters that match the commonly used linear springs: from .75" (19 mm) to 2" (51 mm), when you need to decide what you need For the number of gas springs, the pressure of the gas springs with the same diameter and high pressure can be divided by the total pressure required. Under normal circumstances, it is rarely required that the pressure provided by the spring be the same as the required pressure. However, please remember that the pressure provided should be evenly distributed on the backing plate. In the design, you can use more springs with lower pressure to achieve this requirement in the mold.
For example: a 0.75" (19 mm) diameter gas spring can be modeled at 200 pounds (0.9 kN) force. Divide the total force required by the gas spring force to determine the number of gas springs. Quantity = 800 pounds (3.6 kN) ÷ 200 lbs. (0.9 kN) = 4, if you want to balance the pressure, in your application, you can choose a lower force model and an increased number of gas springs.
