characteristic
1. Small specific gravity and high specific strength. 2. Good energy absorption. 3. Good vibration control effect. 4. Large specific surface area. A quarter of the tissues are through holes.
trait
1. Reduce the injection pressure and the molding and holding time. 2. Reduce and eliminate the internal stress of molded parts, and prevent the deformation and warpage of products. 3. Plastic parts with surface dermatoglyphics can meet the requirements of matte surfaces due to the bright dermatoglyphics produced by high temperature and high pressure. 4. Due to the close cooperation of parting surfaces, the difficulties in mold opening can be solved. It can solve many problems, such as using ejector pins and inserts, which can not provide enough surface area to accommodate a large amount of gas that may be generated, and avoid flash and other defects caused by using parting surfaces or other exhaust systems. 5. It can solve and alleviate the difficult molding problems such as gate deviation, uneven wall thickness and thin wall products. 6. The defects such as burning, flow marks, shortage of materials and deformation of parts caused by suction caused by the gas produced by high temperature of molding materials and rapid pressure gathering in the mold cavity can be fully solved. 7. Improve the molding production efficiency and save the production cost.
Therefore, by setting PM-35 breathable steel in the proper position of the injection mold, the injection molding problem caused by gas can be completely eliminated, and the molding process is more perfect.
After being used for a period of time, the air permeability quality of PM-35 air permeable steel decreases:
1. There are plastic chips or tar blocking micropores, so a suitable plastic dilution solvent should be used, and then high pressure air should be introduced one hour later to check the air permeability quality.
2. Due to the oil pollution blockage caused by inserts, plastic additives, release agents, etc., the surface can be cleaned by acetone, etc., and then the effect can be checked by high-pressure air.
3. The above-mentioned problems that still cannot be solved must be repaired by soft processing and washed with acetone, and can be recovered after being completely dried. Can't solve the flow mark, mottling, etc.: The reasons caused by the flow mark are complicated, such as poor exhaust, the size of the cold cavity, the shape and position of the feeding port, the mold temperature, the performance of the plastic, etc. So first of all, we need to determine what causes it. Breathable steel only solves the problem of poor exhaust.
Ex-factory status: pre-hardened to HV350-400(HRC35-40).
Features: High quality, pre-hardening, air permeability, excellent rust and acid resistance, easy cutting and good electrical discharge machining performance.
Structure of breathable steel: PM-35 breathable steel is a kind of "breathable" high-quality steel, which is refined by powder sintering technology.
It contains a series of pores with a diameter of 10 microns, accounting for 20%-30% of the total volume of steel. This special structure not only has air permeability, but also can maintain the high strength, high hardness and corrosion resistance required by the injection mold.
