1. Equipment tonnage
When selecting the molding process of SMC/GRP composite products, the tonnage of the hydraulic press (molding press) can be selected according to the unit pressure that the product bears the least. For eccentric products or products with large depth dimensions where the molding material needs to flow laterally, the tonnage of the press can be calculated according to the unit pressure of the projected area of the product up to 21-28MPa.
2. Press open height
Press open height refers to the middle distance from the highest point of the movable cross beam of the press to the work surface. For composite material compression molding machine opening selection is generally 2-3 times larger than the mold height.
3. Press stroke
Press stroke refers to the maximum distance that the movable beam of the press can move. For composite material compression molding machine stroke selection such as mold height 500mm, press opening we choose 2.5 times the mold height of 1250mm, then our equipment stroke should not be less than 800mm.
4. Press worktable size
For small tonnage presses or small products, the press table can be selected according to the size of the mold. At the same time, the left and right sides of the press are larger than the mold size by 300mm on one side, and the front and back directions are larger than 200mm. If a large-tonnage press or large product is produced and requires multiple people to assist in removing the product, the extra dimensions of the person entering and exiting the press table should be considered.
5. Accuracy of press worktable
When the maximum tonnage of the press is uniformly applied to 2/3 of the area of the table, when the movable beam and the press table are supported on the four-corner support, the parallelism is 0.025mm/m.
6. Pressure growth
When the pressure increases from zero to the maximum tonnage, the time required is generally controlled within 6s.
7. Ordinary press speed
Under normal circumstances, the press is divided into three speeds: the fast speed is generally 80-150mm/s, the slow speed is generally 5-20mm/s, and the return stroke is 60-100mm/s.
8. Zhengxi hydraulic press speed
The operating speed of the press directly affects the output of the product. Due to the consideration of the increase in the output of the product and the reduction of the residual quantity of the product, today Zhengxi company develops and adjusts the operating speed of the composite molding press.
The operating speed of our press is divided into five speeds: fast 200-400mm/s, slow 6-15mm/s, pressing (pre-compression) speed 0.5-5mm/s, mold opening speed 1-5mm/s, The return speed is 200-300mm/s. At present, the five mature operating speeds of the company’s presses not only increase the output of customers’ products, but the user-friendly speed adjustment can also eliminate product defects.
Next, we will attach the parameter table of our company’s molding machine for your reference.
Post time: May-06-2021
